BSI - BS A 297
Specification for Internal Drive, Offset Cruciform Recess (Torq-Set) for Rotary Fastening Devices. Metric Series
|Publication Date:||31 March 1987|
|ICS Code (Fasteners in general):||49.030.01|
Specifies maximum and minimum dimensional requirements for rotary fastening devices, and for associated drivers and gauges, for metric design.