This 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. Flare type fittings shall be as specified in Figs. 1-4 and Tables 1-3. NOTE: For sizes 3/16-3/8 and 1/2-3/4 the flare type fittings depicted in Figs. 1A-3C are identical with the corresponding refrigeration tube fittings specified in SAE J513. Special size combination fittings 3/16-3/8 and 1/2-3/4 shall be as specified in J513. Inverted flared type fittings shall be as specified in Figs. 5–11 and Tables 1, 4–7. Gages and gaging procedures pertaining to inverted flared tube fittings are given in Appendix A. NOTE: The seat dimensions specified in Table 4 are predicated on practical threading limitations in steel fittings and use of these fittings with double flared tubing.