Aircraft Hydraulic tubing joints and fittings Rotary flexure test

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English

Published date

05-31-2016

Publisher

International Organization for Standardization

ISO 7257:2016 specifies a flexure test procedure to determine and classify the fatigue strengths of reconnectable or permanent hydraulic tube joints.

The procedure is intended for conducting flexure tests of fittings and joints with high-strength hydraulic tubes of various alloys such as corrosion resistant steel, Nimonic?[1], titanium and aluminium alloy hydraulic tube for use on commercial and military aircraft.

A mean stress is applied by holding system pressure in the specimens and then flexing in a rotary bending test machine.

[1] Nimonic? is the trademark of a product supplied by Special Metals Corporation. This information is given for the convenience of users of this document and does not constitute an endorsement by ISO of the product named. Equivalent products can be used if they can be shown to lead to the same results.

DevelopmentNote	Supersedes ISO/DIS 7257. (06/2016)
DocumentType	Standard
Pages	12
PublisherName	International Organization for Standardization
Status	Current
Supersedes	ISO 7257:1983

Standards	Relationship
BS ISO 7257:2016	Identical
GOST R ISO 7257 : 2011	Identical
UNE 28577:1987	Identical
NFL 41 230 : 1985	Identical

BS ISO 7169:2014	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
04/30112507 DC : DRAFT APR 2004	ISO 7169 - AEROSPACE - SEPARABLE TUBE FITTINGS FOR FLUID SYSTEMS, FOR 24 CONES, FOR PRESSURES UP TO 3000 PSI OR 21 KPA - PROCUREMENT SPECIFICATION INCH/METRIC
PREN 4832 : DRAFT 2017	AEROSPACE SERIES - ADAPTOR, PIPE COUPLING 24 DEGREES CONE UP TO 35000 KPA (5080 PSI) RING-LOCKED FITTING AND RING-LOCKED FITTING-REDUCER - INCH SERIES - TECHNICAL SPECIFICATION
DEFSTAN 00-970(PT7)SEC7/3(2010) : 2010	DESIGN AND AIRWORTHINESS REQUIREMENTS FOR SERVICE AIRCRAFT - PART 7: ROTORCRAFT - SECTION 7: INSTALLATIONS
DEFSTAN 00-970(PT7)SEC7/1(2006) : 2006	DESIGN AND AIRWORTHINESS REQUIREMENTS FOR SERVICE AIRCRAFT - PART 7: ROTORCRAFT - SECTION 7: INSTALLATIONS
DEFSTAN 00-970(PT1)SEC6/15(2015) : 2015	DESIGN AND AIRWORTHINESS REQUIREMENTS FOR SERVICE AIRCRAFT - PART 1: FIXED WING - SECTION 6: EQUIPMENT
DEFSTAN 00-970(PT1)SEC6/6(2010) : 2010	DESIGN AND AIRWORTHINESS REQUIREMENTS FOR SERVICE AIRCRAFT - PART 1: FIXED WING - SECTION 6: EQUIPMENT
DEFSTAN 00-970(PT1)SEC6/5(2007) : 2007	DESIGN AND AIRWORTHINESS REQUIREMENTS FOR SERVICE AIRCRAFT - PART 1: COMBAT AIRCRAFT - SECTION 6: EQUIPMENT
DEFSTAN 00-970(PT1)SEC6/14(2015) : 2015	DESIGN AND AIRWORTHINESS REQUIREMENTS FOR SERVICE AIRCRAFT - PART 1: FIXED WING - SECTION 6: EQUIPMENT
DEFSTAN 00-970(PT1)SEC6/7(2011) : 2011	DESIGN AND AIRWORTHINESS REQUIREMENTS FOR SERVICE AIRCRAFT - PART 1: FIXED WING - SECTION 6: EQUIPMENT
DEFSTAN 00-970(PT7)SEC2/SUPP6/5(2015) : INTERIM	DESIGN AND AIRWORTHINESS REQUIREMENTS FOR SERVICE AIRCRAFT - PART 7: ROTORCRAFT - SUPPLEMENT 6: EQUIPMENT (SUBPART F)
DEFSTAN 00-970(PT1)SEC6/13(2014) : 2014	DESIGN AND AIRWORTHINESS REQUIREMENTS FOR SERVICE AIRCRAFT - PART 1: FIXED WING - SECTION 6: EQUIPMENT
DEFSTAN 00-970(PT7)SEC7/2(2007) : 2007	DESIGN AND AIRWORTHINESS REQUIREMENTS FOR SERVICE AIRCRAFT - PART 7: ROTORCRAFT - SECTION 7: INSTALLATIONS
12/30237808 DC : DRAFT JUNE 2012	BS ISO 19631 - AEROSPACE - TUBE FITTINGS FOR FLUID SYSTEMS, 5000 PSI (35000 KPA) - QUALIFICATION SPECIFICATION
17/30358538 DC : 0	BS EN 3275 - AEROSPACE SERIES - PIPE COUPLING 8 DEGREE 30 MINUTES UP TO 28000 KPA - DYNAMIC BEAM SEAL - METRIC SERIES - TECHNICAL SPECIFICATION
BS ISO 19631:2015	Aerospace series. Tube fittings for fluid systems, 5 080 psi (35 000 kPa). Qualification specification
BS 3M 60:1998	Separable tube fittings for fluid systems, 24° cone. General specification
BS 2M 60:1993	Specification for separable tube fittings, 24° cone, for aerospace fluid systems
DIN 65030:1997-01	AEROSPACE - SOLDERLESS TUBE FITTINGS WITH COUPLING SLEEVES, FLAVELESS - TECHNICAL SPECIFICATION
PREN 3275 : 200P1	AEROSPACE SERIES - PIPE COUPLING 8 DEGREES 30 MINUTES UP TO 28000 KPA DYNAMIC BEAM SEAL - METRIC SERIES - TECHNICAL SPECIFICATION
SAE MA 2005 : 2015	TUBE FITTINGS, AEROSPACE FLUID SYSTEMS, SEPARABLE, FOR 24 DEGREE CONE, GENERAL SPECIFICATION, METRIC
BS EN 3275:2002	Aerospace series. Pipe coupling 8°30\' up to 28000 kPa. Dynamic beam seal. Metric series. Technical specification
BS ISO 9538:2017	Aerospace series. Hydraulic tubing joints and fittings. Planar flexure test
ISO 9538:2017	Aerospace series — Hydraulic tubing joints and fittings — Planar flexure test
14/30310862 DC : 0	BS EN 4832 - AEROSPACE SERIES - ADAPTOR, PIPE COUPLING 24 DEGREES CONE UP TO 35000 KPA (5080 PSI) RING-LOCKED FITTING AND RING-LOCKED FITTING-REDUCER - INCH SERIES - TECHNICAL SPECIFICATION
96/712318 DC : DRAFT SEP 1996	PREN 3079 - AEROSPACE SERIES - ADAPTORS WITH LOCKING RING UP TO 2800 KPA - TECHNICAL SPECIFICATION
I.S. EN 3275:2002	AEROSPACE SERIES - PIPE COUPLING 8 DEGREE 30 MINUTES UP TO 28 000 KPA - DYNAMIC BEAM SEAL - METRIC SERIES - TECHNICAL SPECIFICATION
DEFSTAN 00-970(PT1)SEC6/16(2016) : 2016	DESIGN AND AIRWORTHINESS REQUIREMENTS FOR SERVICE AIRCRAFT - PART 1: FIXED WING - SECTION 6: EQUIPMENT
DEFSTAN 00-970(PT7)SEC2/SUPP6/6(2015) : 2015	DESIGN AND AIRWORTHINESS REQUIREMENTS FOR SERVICE AIRCRAFT - PART 7: ROTORCRAFT - SUPPLEMENT 6: EQUIPMENT (SUBPART F)
11/30247209 DC : 0	BS EN 3087 - AEROSPACE SERIES - CLAMPBLOCK - TECHNICAL SPECIFICATION
SAE AIR 2000 : 2000	AEROSPACE FLUID SYSTEM STANDARDS, METRIC, NATIONAL AND INTERNATIONAL
EN 3275:2002	Aerospace series - Pipe coupling 8°30' up to 28 000 kPa - Dynamic beam seal - Metric series - Technical specification
ISO 7169:2014	Aerospace Separable tube fittings for fluid systems, for 24 degree cones, for pressures up to 3 000 psi or 21 000 kPa Procurement specification, inch/metric
EN 3079:2006	Aerospace series - Pipe coupling 8°30' up to 28 000 kPa - Adaptors - Metric series - Technical specification
NF EN 3275 : 2002	AEROSPACE SERIES - PIPE COUPLING 8 DEGREES 30 MINUTES UP TO 28 000 KPA - DYNAMIC BEAM SEAL - METRIC SERIES - TECHNICAL SPECIFICATION
BS M 60:1986	Specification for separable tube fittings for fluid systems
ISO 19631:2015	Aerospace series Tube fittings for fluid systems, 5 080 psi (35 000 kPa) Qualification specification
PREN 3079 : 200P1	AEROSPACE SERIES - PIPE COUPLING 8 DEGREE 30 MINUTES UP TO 28000 KPA - ADAPTORS - METRIC SERIES - TECHNICAL SPECIFICATION
BS EN 3079:2006	Pipe coupling 8°30\' up to 28000 kPa. Adaptors. Metric series. Technical specification

ISO 2964:1985	Aerospace — Tubing — Outside diameters and thicknesses — Metric dimensions
ISO 8575:2016	Aerospace — Fluid systems — Hydraulic system tubing

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ISO 7257:2016

Aircraft Hydraulic tubing joints and fittings Rotary flexure test

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