This SAE Part Standard covers selected inch dimensioned tapping screws and metallic drive screws manufactured in accordance with American Society for Mechanical Engineers dimensional standards. This SAE standard covers material most often used in ship systems and equipment but its use may be applied wherever fasteners of the covered materials are used. This standard permits the fasteners to be identified and ordered by a Part Identification Number (PIN) as defined in this standard.
All references to ASME B18.6.4 and SAE J81 have been replaced by reference to ASME B18.6.3 that now covers tapping screws. For quality assurance, ASME B18.18 has replaced ASME B18.18.2. Other major changes are in regard to Field 2 and 3 of Figure 1. In Field 2, specific designators have been added for a number of thread types and points. In Field 2, the ASTM C 1513 configuration was deleted as the threads were not adequately defined in the standard. In Field 3, the PIN designator now provides diameters and threads for the configurations added in Field 2. In addition, dimensions are provided for the 5/16 and 3/8 size Type U screws. In 4.3.b, The PIN designator in Field 5 for length now utilizes three characters for lengths over six inches. Steel tapping screws with induction hardened ends per GM 6202M (material designator G4) are now inactive for new design. Additional coating options have been added to Field 7 and 4.5.3 for electro-deposited coatings has been revised. The procedure for measuring straightness has been changed from IFI 138 to ASME B18.2.9. IFI-113 is now listed as an alternative to SAE J78 and core hardness requirements for these products have been modified. Minor non-technical changes have been incorporated. Note 5.6 has been modified and Note 5.8 added. Appendix A has been updated.