SAE J1231 Type 1 2 3 4 dimensions formed tube connection styles

Date:Jul 19, 2019

SAE J1231 Formed tube hose fittings shall be made from brass, steel, or other materials listed in SAE J846, and specified by the purchaser.


Brass shall be SAE UNS C36000 (half hard), SAE UNS C34500, or SAE UNS C35000 for bar or extruded stock and SAE UNS C37700 for forgings. Steel tubing shall be SAE standard single wall intended for general applications in low pressure automotive and hydraulic systems.


At the manufacturer’s option, parts may be machined or milled from bar, forged, or of multiple component design.

Fittings made from multiple components shall be capable of withstanding 100 psi (minimum) without leakage or failure.

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