ASTM F2332-06(2022)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:F2332 −06 (Reapproved 2022)
Standard Specification for
Annular Ball Bearings for Instruments and Precision
Rotating Components
This standard is issued under the fixed designation F2332; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 1.4.4 Type IV—Annular ball bearing, for instruments and
precisionrotatingcomponents,deepgroove,flanged,innerring
1.1 This specification covers annular ball bearings intended
extended; (See Annex A13 – Annex A16)
primarily for use in instrument and precision rotating compo-
nents. Instrument and precision ball bearings should meet 1.4.5 Type V—Annular ball bearing, for instruments and
tolerances specified in ABMA Standard 12.2, Instrument Ball precision rotating components, angular contact, unflanged,
Bearings Inch Design for Classes ABEC 5P and 7P.
nonseparable, and counterbored outer ring; (See AnnexA17 –
Annex A20)
1.2 Intended Use—Ball bearings defined by this specifica-
tion are intended for use in critical components of instrument 1.4.6 Type VI—Annular ball bearing, for instruments and
systems. Such components range from air circulating blowers
precision rotating components, angular contact, flanged,
and drive motors through precision gear trains, gyro gimbals,
nonseparable, and counterbored outer ring on flange side; (See
and pickoffs to rate integrating spin-motors.
Annex A21 – Annex A24)
1.3 The specification contains many of the requirements of
1.4.7 Type VII—Annular ball bearing, for instruments and
MIL-B-81793, which was originally developed by the Depart-
precision rotating components, angular contact, unflanged,
ment of Defense and maintained by the Naval Air Systems
separable, and stepped inner ring; (See Annex A25 – Annex
Command (Navy-AS) in Lakehurst, NJ. The following gov-
A28)
ernment activity codes may be found in the Department of
1.4.8 Type VIII—Annular ball bearing, for instruments and
Defense, Standardization Directory SD-1.
precision rotating components, angular contact, flanged,
Preparing activity Custodians Review activities
separable, and stepped inner ring; (See Annex A29 – Annex
Navy - AS Army - AT Army-AV
A32)
Navy - AS Navy - MC, SH
Air Force - 99 Air Force–84
1.4.9 Type IX—Annular ball bearing, for instruments and
DLA - GS
precision rotating components, angular contact, unflanged,
1.4 Classification—Annular ball bearings for instrument
nonseparable,andsteppedinnerring.(SeeAnnexA33–Annex
and precision rotating components shall be of the following
A36)
types, as specified:
1.4.1 Type I—Annular ball bearing, for instruments and
1.5 Inch-Pound Specification—This specification covers
precision rotating components, deep groove, unflanged; (See
only the inch-pound bearings.
Annex A1 – Annex A4)
1.5.1 The values stated in inch-pound units are to be
1.4.2 Type II—Annular ball bearing, for instruments and
regarded as standard. No other units of measurement are
precision rotating components, deep groove, flanged; (See
included in this standard.
Annex A5 – Annex A8)
1.6 This standard does not purport to address all of the
1.4.3 Type III—Annular ball bearing, for instruments and
safety concerns, if any, associated with its use. It is the
precision rotating components, deep groove, unflanged, inner
ring extended; (See Annex A9 – Annex A12) responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
1 mine the applicability of regulatory limitations prior to use.
ThisspecificationisunderthejurisdictionofASTMCommitteeF34onRolling
Element Bearings and is the direct responsibility of Subcommittee F34.06 on
1.7 This international standard was developed in accor-
Aerospace.
dance with internationally recognized principles on standard-
Current edition approved Jan. 1, 2022. Published August 2022. Originally
approved in 2006. Last previous edition approved in 2013 as F2332 - 06(2013). ization established in the Decision on Principles for the
DOI: 10.1520/F2332-06R22.
Development of International Standards, Guides and Recom-
The military codes that are listed in SD-1 give the address and phone numbers
mendations issued by the World Trade Organization Technical
of the DoD contacts. These are found in the DoD’s ASSIST website http://
assist.daps.dla.mil/. Barriers to Trade (TBT) Committee.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F2332−06 (2022)
2. Referenced Documents 2.6 NCLS Standard:
3 Z540.1 Laboratories, Calibration, Measuring and Test
2.1 ASTM Standards:
Equipment
A240/A240MSpecification for Chromium and Chromium-
Nickel Stainless Steel Plate, Sheet, and Strip for Pressure 2.7 ISO Standards:
Vessels and for General Applications
ISO1224Bearings,Rolling—InstrumentPrecisionBearings
A313/A313MSpecification for Stainless Steel Spring Wire
ISO 3290Bearings, Rolling–Balls–Dimensions and Toler-
A380Practice for Cleaning, Descaling, and Passivation of
ances
Stainless Steel Parts, Equipment, and Systems
ISO 10012-1Quality Assurance Requirements for Measur-
A580/A580MSpecification for Stainless Steel Wire
ing Equipment
A666SpecificationforAnnealedorCold-WorkedAustenitic
ISO 14644-1Cleanrooms and Associated Controlled Envi-
Stainless Steel Sheet, Strip, Plate, and Flat Bar
ronments. Part 1: Classification of Air Cleaniness
A756Specification for StainlessAnti-Friction Bearing Steel
ISO 14644-2Cleanrooms and Associated Controlled Envi-
A967Specification for Chemical PassivationTreatments for
ronments. Part 2: Specifications for Testing and Monitor-
Stainless Steel Parts
ing to Provide Continued Compliance with ISO 14644-1
D2273Test Method for Trace Sediment in Lubricating Oils
2.8 Department of Defense:
E45Test Methods for Determining the Inclusion Content of
Specifications:
Steel
MIL-DTL-197Packaging of Bearings,Associated Parts and
E140Hardness Conversion Tables for Metals Relationship
Sub-Assemblies
Among Brinell Hardness, Vickers Hardness, Rockwell
MIL-PRF-6085Lubricating Oil, Instrument, Aircraft, Low
Hardness, Superficial Hardness, Knoop Hardness, Sclero-
Volatility
scope Hardness, and Leeb Hardness
4 MIL-PRF-23827Grease, Aircraft and Instrument, Gear and
2.2 ABMA Standards:
Actuator Screw, NATO Code G-354, Metric
STD 1Terminology for Anti-Friction Ball and Roller Bear-
MIL-DTL-53131Lubricating Oil, Precision Rolling Ele-
ings and Parts
ment Bearing, Polyalphaolefin Based
STD 10Metal Balls
MIL-S-81087Silicone Fluid, Chlorinated Phenyl Methyl
STD 12.2Instruments Ball Bearings—Inch Design
Polysiloxane, NATO Code Number H-536
2.3 SAE-AMS Specifications:
MIL-PRF-81322Grease, Aircraft, General Purpose, Wide
SAE-AMS 2303Aircraft Quality Steel Cleanliness, Marten-
Temperature Range
siticCorrosionResistantSteels,MagneticParticleInspec-
MIL-B-81744Barrier Coating Solution, Lubricant Migra-
tion Procedure
tion Deterring
SAE-AMS 5688Steel, Corrosion Resistant Wire, 18CR-
DOD-L-81846Lubricating Oil, Instrument, Ball Bearing,
9.0NI, (SAE 30302), Spring Temper
High Flash Point
SAE-AMS 5880Steel, Corrosion Resistant Bars, Wire and
MIL-G-81937Grease, Instrument, Ultra Clean, Metric
Forgings, 17CR-0.52MO (0.95-1.2C)
MIL-PRF-83261 Grease, Aircraft, Extreme Pressure,
SAE-AMS 6444Steel Bars, Forgings, and Mechanical
Anti-Wear
Tubing, 1.45 Cr (0.98-1.10C) (SAE 52100) Premium
Standards:
Aircraft Quality Consumable Electrode Vacuum Melted
MIL-STD-129Military Marking
SAE-AMS-QQ-S-763 Steel Bars, Wire, Shapes, and
MIL-STD-130IdentificationMarkingofU.S.MilitaryProp-
Forgings, Corrosion Resistant
erty
2.4 ASME Standards:
MIL-STD-206Friction Torque Testing for Bearings, Ball,
B46.1Surface Texture (Surface Roughness, Waviness and
Annular (Instrument Type)
Lay)
MIL-STD-1334Process for Barrier Coating ofAnti-Friction
B89.3.1Measurement of Out of Roundness
7 Bearings
2.5 ASQC Standards:
MIL-STD-1647Identification Markings for Domestically
Z1.4Sampling Procedures and Tables for Inspection by
ManufacturedBearings,Ball,AnnularforInstrumentsand
Attributes
Precision Components
2.9 Federal Standards:
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
FED-STD-791 Lubricants, Liquid Fuel and Related
contactASTM Customer Service at service@astm.org. ForAnnual Book ofASTM
Products, Methods of Testing
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Available from American Bearing Manufacturers Association 1001 N. Fairfax
Street Suite 500 Alexandria, VA 22314-1587. https://www.americanbearings.org/
5 8
AvailablefromSAEInternational(SAE),400CommonwealthDr.,Warrendale, Available from NCSL International 5766 Central Ave, Suite 150 Boulder, CO
PA 15096, http://www.sae.org. 80301. https://ncsli.org/
6 9
Available from American Society of Mechanical Engineers (ASME), ASME Available from International Organization for Standardization (ISO), ISO
International Headquarters, Two Park Ave., New York, NY 10016-5990, http:// Central Secretariat, Chemin de Blandonnet 8, CP 401, 1214 Vernier, Geneva,
www.asme.org. Switzerland, https://www.iso.org.
7 10
Available from American Society for Quality (ASQ), 600 North Plankinton Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,
Avenue Milwaukee, WI 53203 https://asq.org/. Philadelphia, PA 19111-5094, http://quicksearch.dla.mil.
F2332−06 (2022)
3. Performance Requirements vided they withstand service vibration conditions without
becoming detached. Reinstallation does not apply to synthetic
3.1 Annexes—The individual item requirements shall be as
rubber seals.
specified herein and in accordance with the applicable annex.
3.5 Visual Requirements:
In the event of any conflict between the requirements of this
3.5.1 Surface Appearance—Cylindrical mounting surfaces,
specification and the annexes, the latter shall govern.
cage piloting lands, and faces of inner and outer rings shall
3.2 Materials:
have a smooth finished appearance characteristic of one or
3.2.1 Ball and Ring Materials—Balls and rings shall be
more of the following processes: grinding, honing, lapping,
made of corrosion-resistant steel, 440C (UNS S44004), con-
polishing,ortumbling.Thesurfacesshallbefreeofvisibletool
forming to SAE-AMS 5880 or A756; chromium-alloy steel
marks, chatter and waviness, scratches with raised metal, pits,
52100 (UNS G52986) conforming to SAE-AMS 6444 as
rust,orothersurfaceimperfections.Metalretainers,snaprings,
specified by the applicable annexes. (A single material is
and closures shall have a smooth finished appearance charac-
represented by each annex.) teristic of a tumbling process and shall be free of burrs, dents,
and folded material. Machined nonmetallic retainers shall be
3.2.1.1 Material Cleanliness/Inclusion Content—440C
free of delaminations and shall be deburred.
corrosion-resistant steels used for production of bearings shall
3.5.2 Cracks and Fractures—Rings, balls, retainers, snap
meet the cleanliness requirements of SAE-AMS 5880.
rings, and closures shall be free of cracks and fractures.
Chromium-alloysteelusedfortheproductionofbearingsshall
3.5.3 Material Imperfections—Nonmetallic retainers shall
meet the cleanliness requirements of SAE-AMS 6444.
have no material imperfections, such as chipping and pits, in
3.2.1.2 Passivation—Passivation shall be accomplished in
ball contact areas, and material imperfections in other areas
accordance with A380 and A967 on all bearing components
shall not exceed 0.015-in. (0.038-cm) major dimension.
fabricatedfromcorrosion-resistantsteelaftercompletionofall
3.5.4 Particulate Contamination—All exterior surfaces and
machining or metal-removing operations and before assembly.
interior areas of the bearing shall be free of foreign particles
3.2.2 Retainer Metal—When corrosion-resistant steel is
visible using 10× magnification.
specified, crown retainers shall be UNS S41000 and ribbon
3.6 Dimensions:
retainers shall be either UNS S30200, UNS S30500, or UNS
3.6.1 Boundary Dimensions—The boundary dimensions for
S43000 in accordance with A240/A240M or A666. Configu-
each specification sheet shall be in accordance with the
rationshallbeasspecifiedbythepartnumberdesignatorinthe
Boundary Dimensions table of that annex.
Retainer table of the annexes.
3.6.2 Tolerance Class—Tolerance classes for ABEC 5P or
3.2.3 Shield Material—Shield material shall be corrosion-
7P shall be in accordance with the tolerance tables of ABMA
resistant steel conforming to A580/A580M, Condition A,
Standard 12.2. The tolerance classes shall apply to all bearing
A240/A240M,or A666.
sizes listed in the Boundary Dimensions tables of the annexes.
3.2.4 Snap Ring Material—Snap ring material shall be
3.6.3 Roundness—Raceways shall be round within the val-
corrosion-resistant steel conforming to A313/A313M, Type
uesspecifiedinTable1whenmeasuredbytheminimumradial
302, Class 1 or SAE-AMS 5688.
separation (MRS) method. This method consists of construct-
3.2.5 Seal Material—Seal materials shall be as specified by
ing two concentric circles, which fully encompasses the polar
the part number designator in the Closures tables of the
traceofthemeasuredsurfaceandhavetheleastpossibleradial
annexes. Materials shall be compatible with and shall be
separation. This radial separation is the measurement of out of
resistant to deterioration caused by lubricant, preservative,
roundness.
hydraulic fluid, solvents, or other substances and chemicals
3.6.4 Radial Internal Clearance—Radial internal clearance
that can be expected to come into contact with the bearing and
(radial play) of deep groove radial bearings shall be as
shall cause no deterioration of the same. Seal materials shall
specified by the part number designator in the Radial Internal
not affect or be affected by the lubricants and solvents referred
Clearance tables of the annexes.
to in this specification. Synthetic rubber seals shall operate
3.6.5 Contact Angle—The contact angle or radial internal
from −65 to 230°F (−54 to 110°C).
clearance of angular contact bearings shall be as specified by
the part number designator in the Radial Internal Clearance
3.3 Design and Construction—Bearings shall be of the
tables of the annexes and reflects the unit of the appropriate
design, construction, and physical dimensions specified on the
method of measurement. The contact angle shall be as defined
applicable annex (see 3.1).
by ABMA Standard 1. A bearing offered with a singular
3.4 Closures—The number, type, and locations of closures
contact angle shall obtain that value within 61.5° when
shall be as specified by the part number designator in the measured in accordance with 4.7.5.1.
Closures tables of the annexes. Unless otherwise specified,
location for single closures shall be on either side of a
TABLE 1 Surface Roundness
symmetrical bearing.
Precision Level Raceways
3.4.1 Closure Attachment—Closures shall be securely at-
(ABEC) (µin.)
tached to the outer ring and shall permit removal and reinstal-
lation using common bearing working tools. Snap ring wires
are preferred, but “self-holding” closures are permitted pro-
F2332−06 (2022)
3.7 Performance Test—The performance test shall be as
Rings: 0.000100 inch/inch or 0.000025 inch
Balls: 0.000100 inch/inch or 0.000005 inch
specified by the part number designator in the Performance
Test tables of the annexes.
3.12 Lubrication:
3.7.1 Starting Torque—Maximumstartingtorqueshallbein
3.12.1 Lubricant—The lubricant shall conform to the speci-
accordance with the values listed in Table 2.
fication specified by the part number designator in the Lubri-
cant tables of the annexes.
3.8 Ball Quality—The minimum quality level of ball geom-
etry and surface roughness for all bearings of both ABEC
3.12.2 Lubricant Contamination—The lubricant shall meet
tolerance levels shall be a Grade 5 (G5) as selected from the
the contamination requirement of the respective specification
grade levels specified in ABMA Standard 10/ISO 3290. The
when tested in accordance with 4.7.11.2.
balls in each bearing shall come from the same ball lot or be
3.12.3 Lubricant Amount—The amount of lubricant re-
inspected to be G5.
quiredshallbeasspecifiedbythepartnumberintheLubricant
Amount tables of the annexes.
3.9 Hardness of Balls and Rings:
3.9.1 440C Balls and Rings—Through hardness of rings
3.12.4 Barrier Coating—Barrier coating shall be applied to
shall be Rockwell Rc58 min. Through hardness of balls shall
bearings when specified by the part number designator in the
beRockwellRc60min.Throughhardnessofindividualballsin
Lubricant tables of the annexes. The barrier coating shall be
anybearingshallnotvarybygreaterthanfourpointsRockwell
applied in accordance with MIL-STD-1334.The material used
Rc.
shall conform to MIL-B-81744.
3.9.2 52100 Balls and Rings—Through hardness of rings
3.12.4.1 Barrier Coating Facilities—The facilities used for
shall be Rockwell Rc60 min. Through hardness of balls shall
the application of barrier coating shall conform to the require-
beRockwellRc62min.Throughhardnessofindividualballsin
ments of MIL-STD-1334.
anybearingshallnotvarybygreaterthanfourpointsRockwell
3.13 Marking of Barrier Coated Bearings— Marking of
Rc.
barrier coated bearings shall be in accordance with MIL-STD-
3.10 Surface Roughness—Surface roughness of raceways
1334.
shall not exceed 2 microinches (µin.) roughness average (R )
a
3.14 Marking of Non-Barrier Coated Bearings—For mili-
for 1.000 inch outside diameter (OD) and under; 3 µin. R for
a
tary procurements, bearings shall be marked in accordance
over 1.000 inch OD. Surface roughness of mounting surfaces
with MIL-STD-130 or MIL-STD-1647, as specified in the
and cage piloted lands shall not exceed 10 µin R . Faces shall
a
contract or order (see 6.1).
not exceed 16 µin R . Surface roughness shall be measured in
a
accordance with 4.7.9.
3.15 Calibration (Classification)—Bearings shall be sup-
3.11 Dimensional Stability—Ringsandballsshallwithstand plied in classified lots according to bore and outside diameter
temperature changes and exposures under test conditions of (OD) size in steps of 0.00005 or 0.00010 inch when specified
4.7.10withchangesindiameternotexceedingthelargerofthe by the part number designator in the Calibration of Bore and
following:
Outside Diameter tables of the annexes. For classification
TABLE 2 Starting Torque Limits
Bearing Size Maximum Starting Torque
(inch) milligram-millimeters
Load
Bore Outside
(gram) Radial Internal Clearance (inch)
Diameter Diameter
dD 0.0001 to 0.0003 0.0003 to 0.0005 0.0005 to 0.0008
0.0400 0.1250 75 1800 1500 1400
0.0469 0.1562 75 1800 1500 1400
0.0550 0.1875 75 1800 1500 1400
0.0781 0.2500 75 1800 1500 1400
0.0937 0.3125 75 1800 1500 1400
0.0937 0.1875 75 1800 1500 1400
0.1250 0.2500 75 1800 1500 1400
0.1250 0.3125 75 1800 1500 1400
0.1250 0.3750 75 2000 1600 1500
0.1250 0.3750 400 5000 4500 4200
0.1250 0.5000 400 5000 4500 4200
0.1562 0.3125 75 1800 1500 1400
0.1875 0.3125 75 1800 1500 1400
0.1875 0.3750 75 2000 1600 1500
0.1875 0.5000 400 6500 5500 5000
0.2500 0.3750 75 1800 1500 1400
0.2500 0.5000 400 6000 5200 4800
0.2500 0.6250 400 7000 6000 5500
0.2500 0.7500 400 8000 7000 6500
0.3125 0.5000 400 6000 5200 4800
0.3750 0.8750 400 11 000 9500 9000
F2332−06 (2022)
purposes, bore size shall be the smallest single bore measure- 4.6.1 Conformance Inspection—The sample shall be sub-
ment and OD shall be the largest single OD measurement. jectedtotheapplicabletestsspecifiedinTable3,GroupsAand
B. Groups C and D shall be used only when specified by the
3.16 Workmanship—The ball bearings, including all parts,
procuring activity.
shall be constructed and finished in a manner to ensure
compliancewiththerequirementsofthisspecification.Particu- 4.7 Methods of Inspection:
lar attention shall be paid to marking of assemblies and 4.7.1 Material Inspections—Material inspection methods
freedom of parts from burrs and sharp edges. shall be in accordance with the material specification.
4.7.2 Passivation Tests—Passivation tests of corrosion-
3.17 Inspection Condition—The inspection condition shall
resistantcomponentsshallbeconductedinaccordancewiththe
beamanufacturinglotconsistingoffinishedbearingshavinga
coppersulfateorhighhumiditytestsofA380.Eachcomponent
single part number manufactured using well established pro-
shall be examined under 10× magnification to determine
cedures and produced as one continuous batch receiving final
compliance.
inspection at the same location. The inspection lot shall be
4.7.3 Visual Inspections—Inspectionforconformancetothe
identified by a unique number (Manufacturer’s Lot Control
requirements of 3.5.1 through 3.5.4 shall be made using a 10×
Number) to be included on the bearing process sheets, pack-
binocular microscope. All other visual inspections shall be
aging markings and associated certifications that accompany
made without magnification. The classification of defects,
the shipping paperwork. The manufacturer’s lot control num-
Table 4, shall be used to classify the defects found.
bershallbetraceabletothefinishedbearingassemblywhilein
4.7.4 Dimensional Inspections:
its original packaging. The samples taken for acceptance
4.7.4.1 Boundary Dimensions Inspection—The bearing di-
testing/inspection shall be randomly selected to ensure that
mensions required in 3.6.1 and respective tolerance class
theyarerepresentativeofthelot.Componentinformationshall
required in 3.6.2 shall be measured with closures attached in
be maintained for each bearing assembly lot. Multiple compo-
accordance with ABMA Standard 12.2 and ISO 1224.
nent lots are permitted as long as this component information
4.7.4.2 Roundness Measurements—Roundness measure-
is maintained.
ments specifying MRS method microinch values (see 3.6.3)
shallbemadeonequipmentmeetingASMEStandardB89.3.1.
4. Verification
4.1 Inspection Conditions—Unless otherwise specified, all
inspections shall be performed in accordance with the test
TABLE 3 Conformance Inspection
conditions specified herein or in the applicable test method.
Requirement Test
Inspection
4.2 Inspection Area Cleanliness—Inspection areas shall Paragraph Paragraph
meet the cleanliness requirements of ISO 14644-1, Class 5, Group A 3.3 4.7.3
Design and construction 3.2.2 4.7.3
Class 7.
Retainer material 3.4 4.7.3
Closures 3.4.1 4.7.3
4.3 Measurement Standards Calibration— Measurement
Closure attachment 3.5.1 4.7.3
standards shall have calibrations in accordance with ISO
Surface appearance 3.5.2 4.7.3
10012-1 and NCSL Z540.1.
Cracks and fractures 3.5.3 4.7.3
Material imperfections 3.5.4 4.7.3
4.4 Measurement Temperature—Dimensional measurement
Particulate contamination 3.16 4.7.3
madeatotherthanthestandardcalibrationtemperatureshallbe Workmanship 3.12.3 4.7.11.3
Barrier coating 3.14 4.7.3
corrected for temperature effects.
Packing, Preservation, Packaging and
Package Marking
4.5 Inspection Provisions—Alternate inspection procedures
Group B 3.6.1 4.7.4.1
and inspection equipment may be used by the contractor when
Boundary dimensions 3.6.2 4.7.4.2
such procedures and equipment provide, as a minimum, the
Tolerance Class 3.6.4 4.7.5
Radial internal clearance 3.6.5 4.7.5.1
quality assurance required in the contractual documents. Be-
Contact angle 3.7 Applicable
fore applying such alternative inspection procedures and in-
Performance test 3.7.1 Annex
spection equipment, the contractor shall describe them in a Starting torque 3.9 4.7.6.1
Hardness-Balls/Rings 3.15 4.7.8
written proposal and shall demonstrate for the approval of the
Calibration (Classification) 4.7.12
procuring representative that their effectiveness is equal or
Group C 3.2.1.2 4.7.2
better than the contractual quality assurance procedure. In Passivation 3.8 4.7.7
Ball quality 3.6.3 4.7.4.2
cases of dispute as to whether certain procedures of the
Roundness 3.10 4.7.9
contractor’s inspection system provide equal assurance, the
Surface roughness 3.9 4.7.8
Hardness of balls and rings 3.11 4.7.10
contract and procedures of this specification shall apply.
Dimensional stability 3.12.1 4.7.11.1
4.6 Conformance Inspection Sample— An inspection lot
Lubricant 3.12.1 4.7.11.2
Lubricant cleanliness
shall consist of all bearings of a particular identification
Group D 3.2.1 4.7.1
numbersubmittedfordeliveryatthesametime.Foreachlotof
Ball and ring material testing 3.2.1.1 4.7.1
assembled bearings, the procuring activity quality assurance Material cleanliness testing 3.2.3 4.7.1
Shield material testing 3.2.4 4.7.1
representative shall specify the inspection level. If the inspec-
Snap ring material testing 3.2.5 4.7.1
tionlevelisnotspecified,thecontractorshallusetheirstandard
Seal material testing
inspection procedures.
F2332−06 (2022)
TABLE 4 Classification of Defects
parts and obtain repeatable readings. Radial internal clearance
Category Description of Defect Requirement shall be the average of three measurements taken with each
Critical Incorrect material 3.2.1 through 3.2.5 measurement using a different position of the outer race. The
Incorrect design and construction 3.3
measurements shall be made by comparison with a bearing of
Incorrect retainer type 3.3
known radial play or by the method described in ABMA
Incorrect number, type or location 3.4
of closures Standards 12.2 and ISO 1224.
Closures not securely attached 3.4.1
4.7.5.1 Contact Angle—Whenthepartnumberdesignatorin
Cracks or fractures in any 3.5.2
the Radial Internal Clearance tables of the annexes for angular
components
Barrier coat on raceways, 3.12.3 contact bearings specifies a contact angle, the bearing shall be
retainers, or ring lands
mountedinsuchamannerthatnoradialdistortioniscausedby
Major Passivation 3.2.1.2
aninterferencefit.Thetestfixtureshallbesetuptoimpartanet
Burrs, dents or folded material on 3.5.1
closures
thrustnottoexceed2lb.Theinnerraceortheouterraceofthe
Delimitation or burring of non- 3.5.1
bearing shall be rotated at a constant speed while the speed of
metallic retainers
theretainer(rollingelementpitchdiameter)isdetermined.The
Material break out of non-metallic 3.5.3
retainers
number of revolutions of the retainer shall be counted when
Particulate contamination 3.5.4
either the inner or the outer race is rotated. Diametric values
Boundary dimensions
shall be determined and recorded for use in the following
Outer ring outside diameter (OD) 3.6.1
Outer ring OD out-of-round 3.6.2
applicable formulas:
Outer ring OD taper 3.6.2
Rotating Inner Race:
Outer ring radial runout 3.6.2
Outer ring width variation 3.6.2
E 2Ne
Outer ring OD runout with 3.6.2
β 5 cos 1 2 (1)
F F GG
d Ni
reference face
Outer ring corner radii 3.6.1
Rotating Outer Race:
Outer ring OD/flange face 3.6.2
undercut
E 2Ne
Inner ring bore diameter 3.6.1
β 5 cos 21 (2)
F F GG
d No
Inner ring bore out-of-round 3.6.2
Inner ring radial runout 3.6.2
where:
Inner ring width variation 3.6.2
Inner ring bore taper 3.6.2
Ne = rpm of pitch circle,
Inner ring bore runout with 3.6.2
Ni = rpm of rotating inner race,
reference face
No = rpm of rotating outer race,
Inner ring corner radii 3.6.1
Radial internal clearance or contact 3.6.4 or 3.6.5
E = pitch diameter,
angle
β = contact angle, and
Starting torque 3.7.1
d = ball diameter.
Ball quality 3.8
Hardness of balls and rings 3.9
4.7.6 Torque Tests:
Surface roughness of raceways 3.10
4.7.6.1 Starting Torque Test—Starting torque test method
Incorrect lubricant 3.12.1
Barrier coating missing from 3.12.3
shall be in accordance with MIL-STD-206.
required surface
4.7.7 Ball Quality Inspections—Ball diameter measure-
Calibration 3.15
ments shall be based on comparative measurements with
Minor Snap rings not easily removable 3.5.1
Surfaces do not meet visual 3.5.1 through 3.5.4
masterballs.Themeasurementsofmasterballsandballsbeing
requirements
testedshallbemadeatthesametemperatureandwiththesame
Boundary dimensions
gagepressure(seeTable5).Ifthemasterballsareofadifferent
Outer ring width 3.6.1
Outer ring flange width 3.6.1
material than the balls being tested, readings shall be referred
Outer ring flange OD 3.6.1
Outer ring OD roundness 3.6.1
Outer ring raceway roundness 3.6.2 and 3.6.3 TABLE 5 Standard Oil Quantities
Inner ring bore roundness 3.6.2 and 3.6.3
A
Number of drops, #26 BD needle 1
Inner ring raceway roundness 3.6.2 and 3.6.3
Number of Balls
Outer ring raceway runout to 3.6.2 Ball
reference side Diameter
56789 10 11 12
Inner ring raceway runout to 3.6.2
0.0250 11111111
reference side
0.0312 11111111
Surface roughness of mounting 3.10
0.0394 11111122
surface, levels and surfaces
0.0625 12222233
Marking for identification 3.14
0.0937 23333344
0.1250 33333344
0.1406 34444444
0.1562 34444444
Such equipment shall include means to provide a permanent
0.1875 44444455
0.2187 44445555
recording on either strip or polar chart-type recorders.
A
4.7.5 Radial Internal Clearance—Radial internal clearance Oil: Lubricate bearing with the indicated number of drops with a 50/50 mixture by
volume of oil and solvent and allow solvent to evaporate. (The properties of the oil
shall be measured with closures removed and the bearing
shall not change after evaporation of the solvent.) Minimum quantity for Gimbal
lubricated with a thin film of oil. Gage pressure shall be the
bearings (one drop).
minimum required to overcome friction and weight of moving
F2332−06 (2022)
to zero gage pressure and a temperature of 68 6 3°F. fordirtcountinaccordancewithFED-STD-791,Method3004
Conformance to the ball quality requirements specified in ISO orD2273.Thebearing’ssuppliershallmaintainthesampleand
3290 apply. inspection report for examination by the procuring activity’s
4.7.7.1 Diameter Variations per Ball—The differences be- representative and shall certify that the sample was taken from
the lubricant used to lubricate the bearings.
tween the maximum diameter measured and the minimum
diameter measured on each ball is the maximum diameter 4.7.11.3 Barrier Coat Inspection—Barrier coated bearings
variation of that ball per ISO 3290. shall be inspected in accordance with MIL-STD-1334.
4.7.7.2 Ball Diameter Variation per Bearing—The average 4.7.12 Calibration Classification Inspection—Bore and OD
measurementsof4.7.4.1shallbeusedtoverifyconformanceto
diameter of each ball shall be computed by averaging five
measurements of that ball.The difference between the average calibrationrequirements.Individualmeasurementsasspecified
in 3.6.1 shall be used rather than average values.
diameter of the largest ball and the average diameter of the
smallest ball in a bearing is the ball diameter variation of the
5. Packing, Preservation, Packaging and Package
bearing.
Marking
4.7.8 Hardness Tests—The bearings selected for this test
5.1 Packing—Foracquisitionpurposes,thepackingrequire-
shall not be the same bearings used for the dimensional
ments shall be as specified in the contract or order (see 6.1).
stability test. If, because of limited size of surface or for other
5.1.1 Preservation and Packaging—For military
validreasons,RockwellCscalemeasurementsarenotfeasible,
procurements, preservation and packaging shall be in accor-
other methods of measuring hardness may be used, provided
dance with MIL-DTL-197, Method 41B.
correlation with the Rockwell C scale measurement values is
5.1.2 Package Marking—For military procurements, pack-
established. When lighter loads are used, conversion to Rock-
age marking shall be in accordance with MIL-STD-129.
well C shall be through the use of charts in Hardness
Special marking requirements shall be as specified in the
Conversion Tables E140. Hardness tests shall be made on flat
contract or order.
surfaces.
4.7.9 Surface Roughness Tests—Measurements from less
6. Supplementary Requirements
than 1 to 1000 µin. shall be made with equipment meeting the
6.1 Acquisition Requirements—Procurement documents
requirements of ASME B46.1. Such equipment shall allow
should specify the following:
measurements on most surfaces including fine finished or soft
6.1.1 Title, number, and date of the specification.
materials. The equipment shall include means to provide a
6.1.2 Quantity and part identifying number (PIN) of the
permanent graphical plot of the data. Minimum cutoff wave-
bearing required.
length shall be determined by dividing width of surface to be
6.1.3 Ring, ball, retainer, and closure materials (see 3.2).
measured by ten and selecting the next lowest preferred cutoff
6.1.4 Number, type, and location of closures (see 3.4).
wavelength, either 0.001, 0.003, 0.01, or 0.03 in. In deep
6.1.5 Boundary dimensions (see 3.6.1).
groove raceways, the width of the surface is the distance from
6.1.6 Bearing precision level ABEC tolerances (see 3.6.2).
the bottom of the race to either land corner.
6.1.7 Radial internal clearance or contact angle (see 3.6.4
4.7.10 Dimensional Stability Tests—Thedimensionalstabil-
and 3.6.5).
ity of rings and balls shall be demonstrated by the following
6.1.8 Type and amount of lubricant (see 3.12.1 and 3.12.3).
test: The rings and balls shall be subjected to a temperature of
6.1.9 Barrier coating requirements (see 3.12.4).
−80 6 3°F for 25 hr 6 30 min. Immediately following, the
6.1.10 Performance tests required (see 3.7).
parts shall be subjected to a temperature of +302 6 3°F for 25
6.1.11 Packing, preservation, packaging and package mark-
hr 630min.Thiscycleshallthenberepeatedforatotalof100
ing requirements (see Section 5).
hours. Diameter shall be measured at 68 6 3°F and compared
6.1.12 Marking requirements (see 3.14).
to values recorded before temperature cycling.
4.7.11 Lubricant Inspections:
6.2 Envelope Dimension Size Availability—The listing of a
4.7.11.1 Lubricant—Lubricant shall meet the OEM, NSN,
particular envelope dimension size of a bearing in a specifica-
Source Control, Spec Control drawing requirements. When tion sheet does not guarantee availability from every manufac-
required, conformity to a lubricant specification shall be
turer.Shieldsorseals,forinstance,maynotbeavailableonthe
verified by analysis with an infrared spectrometer.
thinner widths of a particular bore and OD. Recommend
4.7.11.2 Lubricant Contamination Tests—All tests shall be
verificationofavailabilityfromindustrysourcesbeforeassign-
performed in a ISO 14644–1, Class 5 environment. Sample ment of PIN.
bearings shall be tested for lubricant contamination by the
7. Keywords
following procedure: When required by contract, the bearing
supplier shall take three random samples from the lubricating 7.1 ABEC 5P; ABEC 7P; angular contact; barrier coating;
fixture or container of lubricant if a fixture is not used, at the bearing void; calibration (classification); contact angle; coun-
time bearings are lubricated. Samples of grease shall be terbored outer ring; deep groove radial; extended inner ring;
preparedandreadfordirtcountinaccordancewithFED-STD- instrument bearing; nonseparable; passivation; precision bear-
791, Method 3005. Samples of oil shall be prepared and read ing; separable; starting torque; stepped inner ring
F2332−06 (2022)
ANNEXES
(Mandatory Information)
A1. ANNULAR BALL BEARINGS FOR INSTRUMENTS AND PRECISION ROTATING COMPONENTS, DEEP GROOVE,
UNFLANGED, CHROMIUM ALLOY STEEL, ABEC 5P
A1.1 Requirements A1.1.8 Calibration—Thecalibrationshallbeasspecifiedby
the part number designator in Table A1.5.
A1.1.1 Design—All bearings described in this specification
sheet shall be deep groove instrument bearings, unflanged.
A1.1.9 Performance Test—The performance test shall be as
specified by the part number designator in Table A1.6.
A1.1.2 Material—The ball and ring material for these bear-
ings shall be chromium-alloy steel 52100 (UNS G52986)
A1.1.10 Lubrication:
conforming to SAE-AMS 6444.
A1.1.10.1 Lubricant—The lubricant shall be in accordance
A1.1.3 Tolerance Class— The tolerance class shall be in
with the specification specified by the part number designator
accordance with the ABEC 5P tolerance tables of ABMA
in Table A1.7.
Standard 12.2. This tolerance class shall apply to all bearing
A1.1.10.2 Lubricant Amount—The amount of lubricant
sizes listed in Table A1.1.
shall be as specified by the part number designator in Table
A1.1.4 Boundary Dimensions—The boundary dimensions
A1.8.
shall be as specified by the dash number (Dash No.) in Table
A1.1.10.3 Barrier Coating— The barrier coating shall be
A1.1.
applied to bearings as specified by the part number designator
A1.1.5 Retainer—The retainer shall be as specified by the
in Table A1.7.
part number designator (PN Des) in Table A1.2.
A1.1.11 Part Number—The part number consists of the
A1.1.6 Closures—The closures shall be as specified by the
following: prefix letter M; general specification number; num-
part number designator in Table A1.3.
berofthisspecificationsheet;dashnumber;andcharactersfor:
A1.1.7 Radial Internal Clearance—The radial internal
retainer, closures, radial internal clearance, calibration, perfor-
clearanceshallbeasspecifiedbythepartnumberdesignatorin
mance test, lubricant, and lubricant amount (see Fig. A1.2).
Table A1.4.
FIG. A1.1Bearing Configuration
F2332−06 (2022)
TABLE A1.1 Boundary Dimensions, inches TABLE A1.2 Retainer
Dash Bore OD Width Radius PN Des Type
A
No. d D C r
0 no retainer, full complement
A
-AA 0.0400 0.1250 0.0469 0.003 1 manufacturer’s standard
B
-BA 0.0469 0.1562 0.0625 0.003 2 crown
B
-BC 0.0469 0.1562 0.0937 0.003 3 ribbon, tight-clinched
C
-CA 0.0550 0.1875 0.0781 0.003 4 ribbon, loose-clinched
D
-CB 0.0550 0.1875 0.1094 0.003 5 PTFE tube separator
-DA 0.0781 0.2500 0.0937 0.003
E ,F
-DB 0.0781 0.2500 0.1406 0.003 7 phenolic laminate
F ,G
-DC 0.0781 0.2500 0.1094 0.003 8 vacuum-impregnated phenolic
F
-EA 0.0937 0.1875 0.0625 0.003 9 nonporous, nonmetallic crown
-EB 0.0937 0.1875 0.0937 0.003
A
One-piece pressed corrosion-resistant steel crown or two-piece pressed
-EC 0.0937 0.2500 0.0625 0.003
corrosion-resistant steel ribbon.
-ED 0.0937 0.2500 0.0937 0.003
B
One-piece pressed corrosion-resistant steel.
-EE 0.0937 0.2500 0.1094 0.003
C
Two-piece pressed corrosion-resistant steel.
-EF 0.0937 0.2883 0.0625 0.003
D
PTFE (polytetrafluoroethylene).
-EG 0.0937 0.3125 0.0625 0.003
E
Phenolic or other porous nonmetallic material.
-EH 0.0937 0.3125 0.1094 0.003
F
Used for high-speed applications.
-EJ 0.0937 0.3125 0.1406 0.003
G
Phenolic or other porous nonmetallic material saturated with lubricant. Selection
-EK 0.0937 0.4100 0.1094 0.003
of this choice dictates choosing manufacturer’s standard amount of lubricant.
-FA 0.1250 0.2500 0.0937 0.003
-FB 0.1250 0.2500 0.1094 0.003
-FC 0.1250 0.3125 0.1094 0.003
-FD 0.1250 0.3125 0.1406 0.003
TABLE A1.3 Closures
-FE 0.1250 0.3750 0.1094 0.005
PN Des Number Type
-FF 0.1250 0.3750 0.1406 0.005
-FG 0.1250 0.3750 0.1562 0.012 N none none
A
-FH 0.1250 0.4100 0.0937 0.003 A one shield
A
-FJ 0.1250 0.4100 0.1094 0.003 C two shield
B
-FK 0.1250 0.4250 0.0937 0.003 D one seal
C
E one seal
-FL 0.1250 0.4250 0.1094 0.003
B
-FM 0.1250 0.4375 0.1094 0.003 H two seal
C
-FN 0.1250 0.4375 0.1406 0.003 J two seal
-FP 0.1250 0.5000 0.1094 0.003
A
Corrosion-resistant steel conforming to Specification A580/A580M, Condition A;
-FR 0.1250 0.5000 0.1719 0.012
Specification A240/A240M; Specification A756; or Specification A666 (for shield)
-FT 0.1250 0.7500 0.1250 0.010
and Specification A313/A313M, Type 302, Class 1, or SAE-AMS 5688 for snap
-FV 0.1250 0.3750 0.0937 0.003
rings.
-GA 0.1562 0.3125 0.1094 0.003
B
Synthetic rubber.
-GB 0.1562 0.3125 0.1250 0.003
C
Glass fiber (polytetrafluoroethylene) or other inert fiber.
-HA 0.1875 0.3125 0.1094 0.003
-HB 0.1875 0.3125 0.1250 0.003
-HC 0.1875 0.3750 0.1094 0.003
-HD 0.1875 0.3750 0.1250 0.003
TABLE A1.4 Radial Internal Clearance
-HE 0.1875 0.4100 0.1094 0.003
PN Des Range, in.
-HF 0.1875 0.4250 0.1094 0.003
-HG 0.1875 0.4375 0.1094 0.003 1 0.0001 to 0.0003
2 0.0003 to 0.0005
-HH 0.1875 0.5000 0.1094 0.003
-HJ 0.1875 0.5000 0.1562 0.012 5 0.0005 to 0.0008
-HK 0.1875 0.5000 0.1960 0.012 8 0.0008 to 0.0011
-HL 0.1875 0.7435 0.1960 0.012 9 As specified in contract
-HM 0.1875 0.7500 0.1960 0.012
-HN 0.1875 0.8750 0.1960 0.012
-JA 0.2500 0.3750 0.1250 0.003
TABLE A1.5 Calibration of Bore and Outside Diameter (OD)
-JB 0.2500 0.5000 0.1094 0.003
-JC 0.2500 0.5000 0.1250 0.005
PN Des Bore Increments OD Increments
-JD 0.2500 0.5000 0.1875 0.005
N no calibration no calibration
-JE 0.2500 0.6250 0.1960 0.012
A no calibration 0.00010
-JF 0.2500 0.7500 0.1960 0.012
B no calibration 0.00005
-JG 0.2500 0.7500 0.2188 0.016
C 0.00010 no calibration
-JH 0.2500 0.7500 0.2812 0.016
D 0.00010 0.00010
-JJ 0.2500 0.8750 0.1960 0.012
E 0.00010 0.00005
-JK 0.2500 1.0000 0.1960 0.012
F 0.00005 no calibration
-JL 0.2500 1.0480 0.1960 0.012
G 0.00005 0.00010
-KA 0.3125 0.5000 0.1562 0.005
H 0.00005 0.00005
-KB 0.3125 0.6250 0.1562 0.010
-LA 0.3750 0.8750 0.2188 0.016
-LB 0.3750 0.8750 0.2812 0.016
-MA 0.5000 0.8750 0.2188 0.016
-MB 0.5000 0.8750 0.2812 0.016
-MC 0.5000 1.1250 0.2500 0.016
-MD 0.5000 1.1250 0.3125 0.016
-NA 0.6250 1.3750 0.2812 0.031
-NB 0.6250 1.3750 0.3438 0.031
A
Maximum shaft or housing fillet radius that bearing corners will clear.
F2332−06 (2022)
TABLE A1.6 Performance Test
PN Des Type
1 manufacturer’s standard
A
2 starting torque
A
Starting torque limits from Table 2 of base document.
TABLE A1.7 Lubricant
PN Des Specification
A
P preservative
A MIL-PRF-6085
B
B MIL-PRF-6085
C DOD-L-81846
B
D DOD-L-81846
E MIL-PRF-23827
F MIL-PRF-81322
G MIL-G-81937
H MIL-PRF-83261
C
J MIL-S-81087
C
K MIL-S-81087
L MIL-DTL-53131, Grade 4
M MIL-DTL-53131, Grade 6
N MIL-DTL-53131, Grade 9
Q MIL-DTL-53131, Grade 14
R MIL-DTL-53131, Grade 40
S As specified in contract
A
PN Des “P” shall be used only with PN Des “P” in Table A1.8.
B
With barrier coat.
C
Canceled – lube no longer manufactured.
TABLE A1.8 Lubricant Amount
PN Des Quantity
P preservative amount as required by
MIL-DTL-197
A
1 manufacturer’s standard
2 oil per Table 5 of base document
3 15 % grease
4 25 % grease
5 35 % grease
6 45 % grease
7 As specified in contract
A
Grease: fill to minimum 25 %, maximum 40 % of bearing void. Oil: immerse and
then allow excess to drip off. The standard quantity of oil varies with each bearing
size.
F2332−06 (2022)
FIG. A1.2Part Number
F2332−06 (2022)
A2. ANNULAR BALL BEARINGS FOR INSTRUMENTS AND PRECISION ROTATING COMPONENTS, DEEP GROOVE,
UNFLANGED, CHROMIUM ALLOY STEEL, ABEC 7P
A2.1 Requirements A2.1.8 Calibration—Thecalibrationshallbeasspecifiedby
the part number designator in Table A2.5.
A2.1.1 Design—All bearings described in this specification
sheet shall be deep groove instrument bearings, unflanged.
A2.1.9 Performance Test—The performance test shall be as
specified by the part number designator in Table A2.6.
A2.1.2 Material—The ball and ring material for these bear-
ings shall be chromium-alloy steel 52100 (UNS G52986)
A2.1.10 Lubrication:
conforming to SAE-AMS 6444.
A2.1.10.1 Lubricant—The lubricant shall be in accordance
A2.1.3 Tolerance Class—The tolerance class shall be in
with the specification specified by the part number designator
accordance with the ABEC 7P tolerance tables of ABMA
in Table A2.7.
Standard 12.2. This tolerance class shall apply to all bearing
A2.1.10.2 Lubricant Amount—The amount of lubricant
sizes listed in Table A2.1.
shall be as specified by the part number designator in Table
A2.1.4 Boundary Dimensions—The boundary dimensions
A2.8.
shall be as specified by the dash number (Dash No.) in Table
A2.1.10.3 Barrier Coating—The barrier coating shall be
A2.1.
applied to bearings as specified by the part number designator
A2.1.5 Retainer—The retainer shall be as specified by the
in Table A2.7.
part number designator (PN Des) in Table A2.2.
A2.1.11 Part Number—The part number consists of the
A2.1.6 Closures—The closures shall be as specified by the
following: prefix letter M; general specification number; num-
part number designator in Table A2.3.
berofthisspecificationsheet;dashnumber;andcharactersfor:
A2.1.7 Radial Internal Clearance —The radial internal
retainer, closures, radial internal clearance, calibration, perfor-
clearanceshallbeasspecifiedbythepartnumber
...