ISO 7169:2014

INTERNATIONAL ISO
STANDARD 7169
Fifth edition
2014-11-15
Aerospace — Separable tube fittings
for fluid systems, for 24° cones, for
pressures up to 3 000 psi or 21 000
kPa — Procurement specification,
inch/metric
Aéronautique et espace — Raccordements séparables de tubes à cône
de 24° pour circuits de fluides jusqu’à 3 000 psi ou 21 000 kPa —
Spécification d’approvisionnement, inch/métrique
Reference number
ISO 7169:2014(E)
©
ISO 2014

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ISO 7169:2014(E)

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© ISO 2014
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
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Published in Switzerland
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ISO 7169:2014(E)

Contents  Page
Foreword .iv
Introduction .v
1  Scope .1
2  Normative references .1
3  Classification .1
4  Requirements .2
4.1 Qualification . 2
4.2 Materials . 2
4.3 Design and manufacture . 5
4.4 Surface protection and colour identification . 6
4.5 Marking . 7
4.6 Performance . 7
4.7 Workmanship . 9
5  Quality assurance provisions .10
5.1 Responsibility for inspection .10
5.2 Inspection lot .10
5.3 Classification of inspections and tests .10
5.4 Quality control records .11
5.5 Quality conformance inspection procedures .12
5.6 Test conditions .12
6  Preparation for delivery .16
6.1 Cleaning .16
6.2 Preservative material .16
6.3 Packaging .16
6.4 Package identification .16
6.5 Packing for shipment .16
6.6 Inspection .16
Annex A (informative)  Equivalent materials and processes.17
Bibliography .20
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ISO 7169:2014(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 20, Aircraft and space vehicles, Subcommittee
SC 10, Aerospace fluid systems and components.
This fifth edition cancels and replaces the fourth edition (ISO 7169:2007), of which it constitutes a
minor revision.
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ISO 7169:2014(E)

Introduction
This International Standard establishes the basic performance and quality criteria for threaded tube
fitting assemblies and port connectors used in aerospace fluid systems.
The test requirements are intended to satisfy the most strenuous demands encountered in a high-
performance aircraft hydraulic system. The procurement requirements are intended to ensure that fittings,
which are procured in accordance with this specification, are of the same quality as the fittings used during
the original qualification testing. Compliance with these test and procurement requirements is necessary
for fittings that are used in control systems where a malfunction would affect the safety of flight.
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ISO 7169:2014(E)

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INTERNATIONAL STANDARD  ISO 7169:2014(E)
Aerospace — Separable tube fittings for fluid systems, for
24° cones, for pressures up to 3 000 psi or 21 000 kPa —
Procurement specification, inch/metric
1  Scope
This International Standard specifies performance and quality requirements for the qualification
and manufacture of standard 24° cone fittings and manufacture of 24° cone fittings to ensure reliable
performance or equivalent inch-dimensioned fitting ends to ensure reliable performance in aircraft
hydraulic systems.
This International Standard specifies baseline criteria for the design and manufacture of system fittings
that are qualification-tested on engines.
This International Standard covers fittings of the temperature types and pressure classes specified in
ISO 6771.
2  Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 2859-1, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by
acceptance quality limit (AQL) for lot-by-lot inspection
ISO 3161, Aerospace — UNJ threads — General requirements and limit dimensions
ISO 5855-3, Aerospace — MJ threads — Part 3: Limit dimensions for fittings for fluid systems
ISO 6771, Aerospace — Fluid systems and components — Pressure and temperature classifications
ISO 6772, Aerospace — Fluid systems — Impulse testing of hydraulic hose, tubing and fitting assemblies
ISO 7257, Aircraft — Hydraulic tubing joints and fittings — Rotary flexure test
ISO 8574, Aerospace — Hydraulic system tubing — Qualification tests for bent tubes
ISO 9538, Aerospace — Hydraulic tubing joints and fittings — Planar flexure test
ISO 10583:1993, Aerospace fluid systems — Test methods for tube/fitting assemblies
3  Classification
Fittings furnished under this International Standard shall be classified as follows:
Type A — 3 000 psi (20 684 kPa) Pressure System
Type B — 21 000 kPa (3046 psi) Pressure System
When no classification is specified, Type B shall apply.
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ISO 7169:2014(E)

4  Requirements
4.1  Qualification
Fittings claiming conformity with this International Standard shall be representative of products which
have successfully met the requirements and have passed the tests in this International Standard.
4.1.1  Manufacturer qualification
Manufacturer approval shall be granted by an outside agency procedure (see Table A.2, procedure No. 1).
4.1.2  Product qualification
Product approval shall be granted by an outside agency procedure (see Table A.2, procedure No. 2).
4.2  Materials
4.2.1  Fittings
The fitting parts shall be manufactured from materials as given in Table 1 or equivalents passing
the specified tests. The various materials shall be used according to the pressure and temperature
requirements of the system, as shown in Tables 2 to 5.
4.2.2  Tubing
The tubing used with the fittings shall be in accordance with the relevant specification or equivalent
tubing passing the specified qualification tests.
Table 1 — Materials for fittings
Material
a b
Part Material Type Material code Starting stock
c
No.
d
D 1
Straight fittings and nuts Aluminium alloy I Bar, rod
W 2
d
D 3
Shape fittings Aluminium alloy I Bar and forgings
W 2
f
Carbon steel II F Bar, rod, forgings 4
I, II, III J 5
I, II, III K 7
Straight and shape fittings Corrosion-resistant steel Bar and forgings
I, II, III, IV R 6
I, II, III P 11
I, II, II, IV V 11
Titanium alloy I, II, III T Bar and forgings 8
e
Sleeves (bite type) Carbon steel II F Bar 9
I, II, II P 11
Sleeves (swaged, brazed) Corrosion-resistant steel Bar
I, II, II, IV V 11
a
Temperature types and system pressure classes are defined in ISO 6771.
b
See Table 7.
c
See Table A.1.
d
Inactive for new design, superseded by W.
e
Inactive for new design, no replacement.
f
Inactive for new design, superseded by V.
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ISO 7169:2014(E)

Table 1 (continued)
Material
a b
Part Material Type Material code Starting stock
c
No.
Corrosion-resistant steel I, II, III, IV V 11
Sleeves (welded) Bar
Titanium alloy I, II, III, IV T 8
a
Temperature types and system pressure classes are defined in ISO 6771.
b
See Table 7.
c
See Table A.1.
d
Inactive for new design, superseded by W.
e
Inactive for new design, no replacement.
f
Inactive for new design, superseded by V.
Table 2 — Test requirements, 3 000 psi steel or titanium fittings on steel or titanium tubing
Fitting and tube
Flexure test, bending
Nominal pressure Proof pressure Burst pressure
stress 0 % to 10 %
Metric Inch
a a
Size Size kPa (psi) kPa (psi) kPa (psi) kPa (psi)
— −02
DN05 −03
DN06 −04
DN08 −05
135 000 (20 000)
DN10 −06
DN12 −08
DN14 — 20 684 (3 000) 41 368 (6 000) 82 740 (12 000)
DN16 −10
DN20 −12
DN25 −16 108 000 (16 000)
DN32 −20
DN40 −24
b b)
108 000 (16 000
— −32
a
Dash size in 1/16 in, example: −05 = 5/16 in diameter; DN size in millimetres, example: DN05: 5 mm.
b
No data available to support this value.
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ISO 7169:2014(E)

Table 3 — Test requirements, 21 000 kPa steel or titanium fittings on steel or titanium tubing
Fitting and tube
Flexure test, bending
Nominal pressure Proof pressure Burst pressure
stress 0 % to 10 %
Metric Inch
a
Size Size kPa (psi) kPa (psi) kPa (psi) kPa (psi)
— −02
DN05 −03
DN06 −04
DN08 −05
135 000 (20 000)
DN10 −06
DN12 −08
DN14 — 21 000 (3 046) 42 000 (6 091) 84 000 (12 183)
DN16 −10
DN20 −12
DN25 −16 108 000 (16 000)
DN32 −20
DN40 −24
b b)
108 000 (16 000
— −32
a
Dash size in 1/16 in, example: −05 = 5/16 in diameter; DN size in millimetres, example: DN05: 5 mm.
b
No data available to support this value.
Table 4 — Test requirements, return line aluminium fittings, up to 1 500 psi, on aluminium
Fitting and tube
Flexure test, bending
Nominal pressure Proof pressure Burst pressure
stress 0 % to 10 %
Metric Inch
a a
Size Size kPa (psi) kPa (psi) kPa (psi) kPa (psi)
— −02
DN05 −03
DN06 −04 41 368 (6 000)
DN08 −05 10 342 (1 500) 20 684 (3 000) 41 368 (6 000)
DN10 −06
DN12 −08
DN14 — 37 922 (5 500)
DN16 −10 6 845 (1 000) 13 790 (2 000) 27 579 (4 000)
DN20 −12 34 474 (5 000)
6 206 (900) 12 411 (1 800) 24 824 (3 600)
DN25 −16
27 579 (4 000)
DN32 −20
DN40 −24 4 137 (600) 8 274 (1 200) 16 548 (2 400)
b b)
27 579 (4 000
— −32
a
Dash size in 1/16 in, example: −05 = 5/16 in diameter; DN size in millimetres, example: DN05: 5 mm.
b
No data available to support this value.
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ISO 7169:2014(E)

Table 5 — Test requirements, return line aluminium fittings, 10 500 kPa, on aluminium tubing
Fitting and tube
Flexure test, bending
Nominal pressure Proof pressure Burst pressure
stress 0 % to 10 %
Metric Inch
a a
Size Size kPa (psi) kPa (psi) kPa (psi) kPa (psi)
— −02
DN05 −03
DN06 −04 41 368 (6 000)
DN08 −05
DN10 −06
DN12 −08
DN14 — 10 500 (1 522) 21 000 (3 046) 42 000 (6 091) 37 922 (5 500)
DN16 −10
DN20 −12 34 474 (5 000)
DN25 −16
27 579 (4 000)
DN32 −20
DN40 −24
b b)
27 579 (4 000
— −32
a
Dash size in 1/16 in, example: −05 = 5/16 in diameter; DN size in millimetres, example: DN05: 5 mm.
b
No data available to support this value.
4.3  Design and manufacture
4.3.1  Threads
All threads shall be in accordance with ISO 3161 for inch-size tube fittings, and with ISO 5855-3 for SI-
metric tube fittings.
Threads can be cut, rolled, or, except for titanium, ground. The external threads of fittings should be rolled
and, if machined, shall have an arithmetical mean deviation, R , of the profile of 3,2 µm (0,125 µin) or smoother.
a
Rolled threads shall be free of laps, cracks, surface irregularities, and seams on any part of the pressure
thread flank, in the thread-root, or on the non-pressure thread flank. Laps and seams whose depths
are within the limits of Table 6 are acceptable on the crest and the non-pressure thread flank above the
pitch diameter.
Table 6 — Maximum depth of laps, seams and surface irregularities in rolled threads
Fitting size
Depth
Metric Inch
a
Size Size mm (in)
— −02 0,15 (0,006)
DN05 −03 0,15 (0,006)
DN06 −04 0,18 (0,007)
DN08 −05 0,18 (0,007)
DN10 −06 0,20 (0,008)
DN12 −08 0,22 (0,009)
DN14 — 0,25 (0,01)
a
Dash size in 1/16 in, example: −05 = 5/16 in diameter; DN size in millimetres, example:
DN05 = 5 mm.
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ISO 7169:2014(E)

Table 6 (continued)
Fitting size
Depth
Metric Inch
a
Size Size mm (in)
DN16 −10 0,25 (0,01)
DN20 −12 0,25 (0,01)
DN25 −20 0,25 (0,01)
DN32 −16 0,25 (0,01)
DN40 −24 0,25 (0,01)
— −32 0,25 (0,01)
a
Dash size in 1/16 in, example: −05 = 5/16 in diameter; DN size in millimetres, example:
DN05 = 5 mm.
4.3.2  Fluid passages
On fittings where the fluid passage is drilled from each end, the offset between the drilled holes at the
meeting point shall not exceed 0,4 mm (0,015 in). It shall be possible to pass through the fitting passage
a ball whose diameter is 0,5 mm (0,020 in) less than the minimum diameter specified for the passage.
4.4  Surface protection and colour identification
4.4.1  Surface protection
The surfaces of fitting parts shall be protected in the following manner:
a) Aluminium alloy fittings: by sulfuric acid anodizing, then dyeing and dichromate or nickel acetate
sealing (process No. 18 in Table A.1);
b) Carbon steel fittings and sleeves: by cadmium plating 0,007 mm to 0,012 mm (0,000 30 in to
0,000 50 in) thick, followed by a chromate post-plate treatment (process No. 19 in Table A.1);
Note Cadmium plating is not to be used in new designs.
c) Corrosion-resistant steel fittings: by passivation treatment (process No. 12 in Table A.1). Sleeves
can be cadmium plated (process No. 19 in Table A.1);
d) Titanium fittings: by a fluoride conversion coating or anodizing (process No. 20 or No. 21 in Table A.1).
4.4.2  Colour identification
As a reference, the material of the finished fitting can be distinguished by the colours as shown in Table 7.
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ISO 7169:2014(E)

Table 7 — Material codes and colours
Material Code Colour
a
Aluminium D Green
Aluminium W Brown
a
Carbon steel F Gold brown
Corrosion-resistant steel J Bright metallic
Corrosion- and acid-resistant steel K Bright metallic
Corrosion-resistant stabilized steel R Bright metallic
a,b
Heat-treatable corrosion-resistant steel P Gold brown
Heat-treatable corrosion-resistant steel V Metallic
Titanium T Dull gray
a
Inactive for new design.
b
P designatives V material, cadmium plated.
4.5  Marking
Unless otherwise specified, parts shall be permanently identified with the complete part number and the
manufacturer’s trademark. The method of marking shall be laser marking, impression stamping or electro-
etching, in that order of preference. When the complete part number cannot be used in the DN10 (−06) size
and under because of the size of the part, the marking can be limited to the basic part number, without a
size designation. The marking shall not be in a location detrimental to the part of its surface protection,
and should preferably be visible when the part is assembled. When material code letters are used, the code
letter (see Table 7) shall also be laser marked, electro-etched, or impression stamped on the part.
Laser marking shall not be used on weld-ends of titanium weld fittings.
4.6  Performance
The tubing/fitting assembly shall be capable of meeting the performance requirements specified in
4.6.1 to 4.6.7.
4.6.1  Proof pressure
When testing in accordance with ISO 10583:1993, 5.1, the test assembly shall withstand pressure equal
to twice the nominal pressure in conformity with ISO 8574 without leakage, evidence of permanent
deformation or other malfunction that might affect the ability to disconnect or connect using the
specified range of torque values. All specimens, except tensile specimens, shall be proof tested.
4.6.2  Gaseous pressure
When tested in accordance with ISO 10583:1993, 5.2, assemblies shall pass the gaseous pressure test to
the specified nominal pressure without leakage or other failure. Six specimens shall be tested.
4.6.3  Hydraulic impulse resistance
When tested in accordance with ISO 6772 and ISO 10583:1993, 5.3, the test assembly shall withstand
200 000 impulse pressure cycles without leakage. Six specimens shall be tested.
4.6.4  Minimum burst pressure
When tested in accordance with ISO 10583:1993, 5.4, there shall be no leakage or burst at less than the
specified minimum burst pressure. Tubing expansion is permissible. Six specimens shall be tested to failure.
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ISO 7169:2014(E)

4.6.5  Flexure fatigue resistance
4.6.5.1  Standard rotary flexure text, temperature type II, pressure class D
When tested in accordance with ISO 7257 and ISO 10583:1993, 5.5, the test assemblies shall not fail. Six
specimens with straight unions shall be tested. Bulkhead-tee fitting connections shall match the flexure
fatigue life of straight unions. Two specimens with bulkhead tees shall be tested.
4.6.5.1.1  Basic qualification requirement for flexure testing to 10Text 7 cycles
a) Steel 24° cone fittings shall be used with ISO 6771 type II, class D, 304 1/8 hard cold-worked
corrosion-resistant steel tubing (material No. 14 in Table A.1). Inch sizes shall be flexure fatigue
tested to 135 MPa (20 000 psi) bending stress in sizes −10 and under, and 108 MPa (16 000 psi) in
0
sizes −12 and over to a relative tolerance of %.
−10
Metric sizes shall be flexure fatigue tested to 135 MPa (20 000 psi) bending stress in sizes DN16 and
0
under, and 108 MPa (16 000 psi) in sizes DN20 and over, to a relative tolerance of %.
−10
b) For use with type II, class D, 21-6-9 cold-worked tubing (Material No. 15 in Table A.1), inch size steel
24° cone fittings shall be flexure fatigue tested to 135 MPa (20 000 psi) bending stress in sizes −10
0
and under, and 108 MPa (16 000 psi) in sizes −12 and over, to a relative tolerance of %.
−10
Metric sizes shall be flexure fatigue tested to 135 MPa (20 000 psi) bending stress in sizes DN16 and
0
under, and 108 MPa (16 000 psi) in sizes DN20 and over, to a relative tolerance of %.
−10
c) Titanium 24° cone fittings shall be flexure fatigue tested with type II, class D, 3Al-2,5V cold-worked
and stress-relieved tubing (material No. 17 in Table A.1). Inch sizes shall be flexure fatigue tested to
135 MPa (20 000 psi) bending stress in sizes −10 and under, and 108 MPa (16 000 psi) in sizes −12
0
and over, to a relative tolerance of %.
−10
Metric sizes shall be flexure fatigue tested to 135 MPa (20 000 psi) bending stress in sizes DN16 and
0
under, and 108 MPa (16 000 psi) in sizes DN20 and over, to a relative tolerance of %.
−10
4.6.5.1.2  Alternative qualification test requirements
Modifications of 24° cone fittings, other fitting designs, new tubing materials or other attachment
methods are to be qualified by comparing their fatigue life against that of the basic 24° cone fitting by
7
testing to 10 cycles, to the same fatigue life measured in deflection as the basic fitting. The performance
of such other designs, materials or joining methods shall meet or exceed that of the standard 24° cone
type II, class D fitting and cold-worked corrosion-resistant steel tubing (material No. Fourteen in
7
Table A.1); that is, all six specimens shall withstand 10 flexure cycles without failure.
4.6.5.1.3  Alternative qualification test requirement using S-N curve
The S-N method of testing eight specimens given in ISO 7257 can be used as an alternative to the method
7
of testing six specimens to 10 cycles at a specified bending or stress level (4.6.5.1.1).
NOTE This alternative method requires testing of at least eight specimens, two each at four stress levels, to
produce an S-N curve. Such a curve shows cycles to failure for three sets of two specimens tested to different high
stress levels, and one set of two specimens at one low stress level which lasts 10Text 7 cycles without failure.
4.6.5.2  Rotary flexure test for other temperature types and pressure classes
Fitting assemblies of temperature types and pressure classes other than those in ISO 6771 shall be
qualified by testing to the same deflection levels as obtained for testing in accordance with 4.6.5.1. The
performance shall meet or exceed that of the ISO 6771 type II, class D fitting.
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ISO 7169:2014(E)

4.6.6  Re-use capability
Three samples shall be tested in accordance with ISO 10583:1993, 5.7, there shall be none of the
following defects:
a) leakage during any of the proof pressure tests;
b) inability to assemble the fitting to the interface point by hand;
c) nut deformation preventing engagement of the nut hexagon with an open-end wrench; and
d) gaseous leakage following final assembly, when tested in accordance with 4.6.2.
4.6.7  Tensile load capability
When tested in accordance with ISO 10583:1993, 5.8, steel fitting assemblies of temperature type II, and
pressure class D, shall withstand the axial loads specified in Table 8 without rupture. Two specimens
shall be tested.
4.7  Workmanship
Fitting parts shall conform with the requirements specified on the drawing and in this International
Standard and shall be free of burrs and slivers. Sealing surfaces shall be machined smooth to a finish
with an R value of 1,6 μm (0,06 µin). All other machined surfaces shall have a roughness value, R , of
a a
3,2 μm (0,125 µin). Unmachined surfaces of forgings or bar stock flats shall be of uniform quality and
condition. They shall be free of cracks, folds, fissures, pits, or defects, as visible to the unaided eye or
by magnetic or dye-penetrant inspection. Defects that can be removed so that they do not reappear
on re-etching, and where the required section thickness can be maintained, shall not be considered as
grounds for rejection.
Table 8 — Minimum joint strength, steel 24° cone fitting on steel and titanium tubing
Fitting size Tube wall thickness Tensile strength
Metric part Inch part
Metric part Inch part
Equivalent tube outside diameter
a
Size Size mm (in) mm (in) (in) mm kN (lbs)
— −02 3,175 0 (0,125 0) 0,3 (0,012) (0,012) 0,30 1,78 (400)
DN05 −03 4,762 5 (0,187 5) 0,4 (0,016) (0,016) 0,41 3,56 (800)
DN06 −04 6,350 0 (0,250 0) 0,5 (0,020) (0,020) 0,51 4,60 (1 300)
DN08 −05 7,937 5 (0,312 5) 0,5 (0,020) (0,020) 0,51 7,50 (1 800)
DN10 −06 9,525 0 (0,375 0) 0,7 (0,028) (0,028) 0,71 11,0 (2 500)
DN12 −08 12,700 0 (0,500 0) 0,9 (0,035) (0,035) 0,89 19,0 (4 200)
b b b b b b b b
DN14 —
DN16 −10 15,875 0 (0,625 0) 1,1 (0,043) (0,042) 1,07 31,0 (6 200)
DN20 −12 19,050 0 (0,750 0) 1,5 (0,060) (0,058) 1,47 40,0 (8 800)
DN25 −16 25,400 0 (1,000 0) 1,6 (0,063) (0,065) 1,65 44,0 (10 000)
DN32 −20 31,750 0 (1,250 0) 1,2 (0,047) (0,049) 1,24 42,2 (9 500)
b b b b b b
DN40 −24 38,100 0 (1,500 0)
b b b b b b
— −32 50,800 0 (2,000 0)
a
Dash size in 1/16 in, example: −05 = 5/16 in diameter.
b
These values will be added when available.
© ISO 2014 – All
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