SAE J318-2003 Automotive Air Brake Line Couplers (Gladhands)

1. Scope-This SAE Recommended Practice is intended to provide design, interchangeability dimensions, testing procedures, performance requirements, and minimum identification for gladhand-type air line couplers used to connect the brake systems of trucks, truck-tractors, trailers, and dollies when these vehicles are joined to operate as a combination unit.
1.1 Purpose-The purpose is to provide coupler halves for brake lines on one vehicle that will be identified and compatible with the coupler halves on the brake lines of another vehicle.

2. References
2.1 Applicable Publication-The following publication forms a part of the specification to the extent specified herein.
2.1.1 ASTM PUBLICA TION-Available from ASTM,100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.
ASTM B117-Standard Method of Salt Spray(Fog) Testing

3. Design and Interchange Ability Dimensions
3.1 Design is limited only to those areas having dimensions that insure interchangeability. Any material may be used, providing that the coupler meet the performance requirements. Other devices may be included in the gladhand, such as a quick-release valve or shut-off valve. Recommended practices for these devices are not included in this document.
3.2 General design and interchangeability dimensions are shown for polarized and non-polarized couplers as follows in Figures 1 to 3.
Use of non-polarized couplings is not recommended because they will mate with either polarized couplings which could result in incorrect connections between vehicles.

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