BSI - BS 1981
Specification for Unified machine screws and machine screw nuts
|Publication Date:||31 July 1972|
|ICS Code (Bolts, screws, studs):||21.060.10|
|ICS Code (Nuts):||21.060.20|
Materials, dimensions and tolerances for slotted and recessed screws with countersunk, pan, raised cheese and raised countersunk heads and plain slotted hexagon head screws. Overall diameter range No. 0 to ¾ in but varies according to head style. Metric slot widths included as an appendix.