This standard covers general and dimensional data pertinent to the various types of screw and captive washer assemblies, otherwise known as SEMS, which are recognized as American National Standards. (The word SEMS is a generic term applicable to screw and washer assemblies.)

This Standard specifies the characteristics of hexalobular socket head screws in product grades A and with nominal thread sizes from M2 up to and including M10. If other specifications than those listed in this Standard are required, they should be selected from existing JIS standards, f […]

This Standard specifies the characteristics of hexagon socket head cap screws with threads from M1.6 up to and including M64 and product grade A. Gauging of hexagon sockets is specified in Annex A. For approximate masses of screws see Annex B. If, in special cases, specifications other […]

This standard specifies requirements for M 3 to M 48 prevailing torque type hexagon nuts with nonmetallic insert, assigned to product grade A for sizes up to M 16 and product grade B for sizes over M 16. If, in special cases, nuts are to comply with specifications other than those given i […]

This Standard specifies the requirements for tapping screw and plain washer assemblies with spaced threads from ST2.2 to ST9.5 inclusive, flat seating heads and mechanical properties in accordance with JIS B 1055. The plain washers are captive, i.e. prevented from disassembly and free to rotate.

This standard specifies requirements for M 3 to M 16 hexagon weld nuts assigned to product grade A.