SAE J1131 automotive air brake tube fittings requirement

Date:Jul 20, 2019

SAE J1131_199808 Standard is intended to establish uniform methods of testing SAE J844 tubing and fitting assemblies as used in automotive air brake systems.


This SAE J1131 document also establishes minimum qualifications for tensile and pressure capabilities, vibrational durability under cyclic temperatures, serviceability, and SAE fitting compatibility requirements. The specific tests and performance criteria applicable to the tubing are set forth in SAE J844.


The referenced standards as follows:

SAE J246—Spherical and Flanged Sleeve (Compression) Tube Fittings

SAE J844—Nonmetallic Air Brake System Tubing


Tension Tests 

Tests consist of subjecting the assembly to increasing tension load in a suitable testing machine until the specified force values or elongation percentages are obtained.

The test specimen shall elongate 50%, that is, 1 52 mm (6 in) increased to 229 mm (9 in), or

shall withstand the load shown in Table 1 , without causing separation from the fitting.


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