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SAE J 512-2022

Automotive Tube Fittings

This SAE Standard covers complete general and dimensional specifications for the various types of tube fittings intended for general application in the automotive, appliance, and allied fields. See SAE J1131 for the performance requirements of reusable (push to connect) fittings intended for use in automotive air brake systems.   Flare type fittings shall be as specified in  Figures 1  to  4  and  Tables 3  to  5 .   NOTE—For sizes 3/16 to 3/8 and 1/2 to 3/4 the flare type fittings depicted in  Figures 1A  to  3C  are identical with the corresponding refrigeration tube fittings specified in SAE J513. Special size combination fittings 3/16 to 3/8 and 1/2 to 3/4 shall be as specified in SAE J513.   Inverted flared type fittings shall be as specified in  Figures 5  to  11  and  Tables 3 ,  6 ,  7 ,  8 , and  9 . Gages and gaging procedures pertaining to inverted flared tube fittings are given in  Appendix A .   NOTE—The seat dimensions specified in  Table 6  are predicated on practical threading limitations in steel fittings and use of these fittings with double flared tubing. Therefore, wherever purchasers contemplate using these fittings with single flared tubing, it is recommended that the optional inverted flare nut ( Figure 9A ) be used.   Tapered sleeve compression type fittings intended for general use with annealed copper alloy tubings shall be as specified in  Figures 12  to  17  and  Tables 3 ,  10 ,  11 , and  12 . To assure satisfactory performance, spherical sleeve compression type fitting components (see SAE J246) should not be intermixed with tapered sleeve compression type fitting components when assembling connections in areas where both types are available.   Dimensions of single and double 45 degree flares on tubing to be used in conjunction with flared and inverted flared fittings are given in Figure 2 and Table 3 of SAE J533.   The following general specifications supplement the dimensional data for all types of fittings contained in  Tables 3  to  13  with respect to all unspecified detail.


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