ASTM F3347-23

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F3347 − 22 F3347 − 23 An American National Standard
Standard Specification for
Metal Press Insert Fittings with Factory Assembled
Stainless Steel Press Sleeve for SDR9 Cross-linked
Polyethylene (PEX) Tubing and SDR9 Polyethylene of
Raised Temperature (PE-RT) Tubing
This standard is issued under the fixed designation F3347; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This specification covers copper alloy metal press insert fittings with factory assembled stainless steel press sleeves
incorporating 3 view holes and tool locator ring. These fittings are for use with cross-linked polyethylene (PEX) tubing in nominal
5 3 1 5 3 1 1
sizes ⁄16, ⁄8, ⁄2, ⁄8, ⁄4, 1, 1 ⁄4, 1 ⁄2, and 2 that meet the requirements for Specification F876 or F3253 and for use with polyethylene
3 1 3 1 1
of raised temperature (PE-RT) tubing in nominal sizes ⁄8, ⁄2, ⁄4, 1, 1 ⁄4, 1 ⁄2, and 2 that meet the requirements of Specification
F2769. These fittings are intended for use in 100 psi (689.5 kPa) hot and cold water distribution systems operating at temperatures
up to, and including, 180 °F (82 °C). The requirements for materials, workmanship, dimensions, and markings to be used on the
fittings and sleeves are also included.
1.1.1 When used with PEX tubing in accordance with Specification F876, the fittings covered by this specification are intended
for use in, but not limited to, residential and commercial, hot- and cold-potable water distribution systems, water service lines,
building supply lines, reclaimed water, fire protection, radiant heating and cooling systems, hydronic distribution systems, snow
and ice melting systems, geothermal ground loops, district heating, turf conditioning, compressed air distribution and building
services pipe.
1.1.2 When used with PEX tubing in accordance with Specification F3253, the fittings covered by this specification are intended
for use in residential and commercial hydronic heating and cooling systems.
1.1.3 When used with PE-RT tubing in accordance with Specification F2769, the fittings covered by this specification are intended
for use in residential and commercial, hot- and cold-potable water distribution systems.systems, and building supply lines.
1.2 Units—The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.4 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.
This test method is under the jurisdiction of ASTM Committee F17 on Plastic Piping Systems and is the direct responsibility of Subcommittee F17.10 on Fittings.
Current edition approved July 1, 2022Feb. 1, 2023. Published July 2021February 2023. Originally approved in 2018. Last previous edition approved in 20212022 as
F3347–21. DOI: 10.1520/F3347–22–22. DOI: 10.1520/F3347–23
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F3347 − 23
2. Referenced Documents
2.1 ASTM Standards:
A269/A269M Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service
B124/B124M Specification for Copper and Copper Alloy Forging Rod, Bar, and Shapes
B16/B16M Specification for Free-Cutting Brass Rod, Bar and Shapes for Use in Screw Machines
B283/B283M Specification for Copper and Copper-Alloy Die Forgings (Hot-Pressed)
B371/B371M Specification for Copper-Zinc-Silicon Alloy Rod
B584 Specification for Copper Alloy Sand Castings for General Applications
D1600 Terminology for Abbreviated Terms Relating to Plastics
D2122 Test Method for Determining Dimensions of Thermoplastic Pipe and Fittings
E92 Test Methods for Vickers Hardness and Knoop Hardness of Metallic Materials
F412 Terminology Relating to Plastic Piping Systems
F876 Specification for Crosslinked Polyethylene (PEX) Tubing
F877 Specification for Crosslinked Polyethylene (PEX) Hot- and Cold-Water Distribution Systems
F2769 Specification for Polyethylene of Raised Temperature (PE-RT) Plastic Hot and Cold-Water Tubing and Distribution
Systems
F3253 Specification for Crosslinked Polyethylene (PEX) Tubing with Oxygen Barrier for Hot- and Cold-Water Hydronic
Distribution Systems
2.2 ASME Standards:
B1.20.1 Pipe Threads General Purpose (Inch)
B16.18 Cast Copper Alloy Solder Joint Pressure Fittings
B16.22 Wrought Copper and Copper Alloy Solder Joint Pressure Fittings
2.3 Manufacturer’s Standardization Society Standard:
MSS SP-104 Wrought Copper Solder Joint Pressure Fittings
2.4 NSF/ANSI Standards:
Standard 14 Plastic Piping Components and Related Materials
Standard 61 Drinking Water System Components-Health Effects
Standard 372 Drinking Water System Components-Lead Content
2.5 EN Standard:
EN 1982 Copper and Copper Alloys, Ingots and Castings
3. Terminology
3.1 Unless otherwise specified, definitions, abbreviations and initialisms are in accordance with Terminology F412 and
Terminology D1600.
3.2 Definitions:
3.2.1 metal press insert fitting, n—A type of piping component that is pushed into the open end of the plastic tubing and attaches
by mechanically pressing and deforming an outer stainless steel sleeve over the outside diameter of the plastic tubing. The seal
is realized between the outer diameter of the insert fitting and the inner diameter of the plastic tubing. Mechanical pressing is
achieved by the use of a press tool.
3.2.2 press sleeve, n—Cylindrical shaped stainless steel ring which is compressed with a pressing tool while located over the PEX
tubing securing it permanently to the underlying insert fitting.
3.2.3 press tool, n—A device by which the stainless sleeve is compressed by a forming die that is radially closed down on the press
sleeve by either hand powered or electro-mechanical pressing action.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
www.asme.org.
Available from Manufacturers Standardization Society of the Valve and Fittings Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http://www.mss-hq.org.
Available from NSF International, P.O. Box 130140, 789 N. Dixboro Rd., Ann Arbor, MI 48105, http://www.nsf.org.
Available from European Committee for Standardization (CEN), Avenue Marnix 17, B-1000, Brussels, Belgium, http://www.cen.eu.
F3347 − 23
4. Classification
4.1 This specification covers one class of fittings and stainless steel press sleeve suitable for use with PEX tubing that meet either
the requirements of Specification F876 or F3253, or with PE-RT tubing that meets the requirements of Specification F2769.
5. Materials and Manufacture
5.1 Fittings—The fittings shall be made from one of the following metals:
5.1.1 Cast Copper Alloys—Cast copper alloy fittings shall be made from material meeting the requirements of Specification B584,
copper alloy UNS Nos. C87710 or C87850 or Standard EN 1982, copper alloy EN Symbol CuSn4Zn6Pb3–C.
5.1.2 Machined Copper Alloy—Machined Copper Alloy fittings shall be made from material meeting the requirements one of the
following:
Specification Aloy Designation
B16/B16M UNS C36000
B124/B124M UNS C65680, C87700
B371/B371M UNS C69300, UNS 69850
5.1.3 Forged Copper Alloy—Forged Copper Alloy fittings shall be made from material meeting the requirements of Specification
B283/B283M, Copper Alloy UNS Nos. C37700, C65680, C69300, C69850, or C87700.
5.2 Press Sleeves—Press sleeves shall be made from Specification A269/A269M UNS S30400 or S31600 and have an allowable
hardness of 130 6 20 HV5 according to Test Method E92.
5.3 Potable Water Requirements—Products intended for the transport of potable water shall be evaluated, tested and certified for
conformance with NSF/ANSI Standard 61 or the health effects portion of NSF/ANSI Standard 14 by an acceptable certifying
organization when required by the regulatory authority having jurisdiction.
5.3.1 NSF/ANSI Standard 372, limiting lead content of a water contacting component to ≤ 0.25 %, is a mandatory requirement
within the current version of NSF/ANSI Standard 61.
FIG. 1 Metal Insert Dimensions
F3347 − 23
TABLE 1 Metal Insert Dimensions and Tolerances
A B D
A ± B ± C D ± F J ± E ± G ±
NST
in. in. in. in. Deg. in. in. Deg. in. in. in. in. in. in.
⁄16 0.281 0.002 0.169 0.004 20° – 30° 0.256 0.002 20° – 30° 0.091 0.004 0.049 0.004 0.118 0.004
⁄8 0.344 0.002 0.236 0.004 20° – 30° 0.319 0.002 20° – 30° 0.091 0.004 0.049 0.004 0.118 0.004
⁄2 0.473 0.002 0.362 0.004 20° – 30° 0.448 0.002 20° – 30° 0.091 0.004 0.049 0.004 0.118 0.004
⁄8 0.571 0.002 0.457 0.004 20° – 30° 0.545 0.002 20° – 30° 0.091 0.004 0.049 0.004 0.118 0.004
⁄4 0.667 0.003 0.559 0.004 20° – 30° 0.642 0.003 20° – 30° 0.091 0.004 0.049 0.004 0.118 0.004
1 0.858 0.003 0.728 0.006 20° – 30° 0.831 0.003 20° – 30° 0.091 0.004 0.049 0.004 0.118 0.004
1 ⁄4 1.047 0.004 0.906 0.008 20° – 30° 1.020 0.004 20° – 30° 0.110 0.004 0.059 0.004 0.138 0.004
1 ⁄2 1.220 0.004 1.083 0.008 20° – 30° 1.193 0.004 20° – 30° 0.110 0.004 0.059 0.004 0.138 0.004
2 1.608 0.004 1.417 0.012 20° – 30° 1.581 0.004 20° – 30° 0.189 0.004 0.059 0.004 0.138 0.004
C B
NST K ± L ± W ± I ± T H ± R ± X
in. in. in. in. in. in. in. in. min in. in. in. in. in. Deg.
⁄16 0.358 0.008 0.50 ±0.01 0.020 0.004 0.039 0.004 0.040 0.005 0.001 0.020 0.004 55° – 65°
⁄8 0.358 0.008 0.50 ±0.01 0.020 0.004 0.039 0.004 0.038 0.005 0.001 0.020 0.004 55° – 65°
⁄2 0.358 0.008 0.50 ±0.01 0.020 0.004 0.039 0.004 0.040 0.005 0.001 0.020 0.004 55° – 65°
⁄8 0.358 0.008 0.50 ±0.01 0.020 0.004 0.039 0.004 0.041 0.005 0.001 0.020 0.004 55° – 65°
⁄4 0.358 0.008 0.50 ±0.01 0.020 0.004 0.039 0.004 0.038 0.005 0.001 0.020 0.004 55° – 65°
1 0.480 0.008 0.62 ±0.01 0.020 0.004 0.039 0.004 0.047 0.006 0.001 0.020 0.004 55° – 65°
1 ⁄4 0.689 0.008 0.87 ±0.01 0.020 0.004 0.039 0.004 0.065 0.006 0.001 0.020 0.004 55° – 65°
1 ⁄2 0.689 0.008 0.87 ±0.01 0.020 0.004 0.039 0.004 0.049 0.006 0.001 0.020 0.004 55° – 65°
2 0.768 0.
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