BS A 297:1987
Current
Date published:
Specification for internal drive, offset cruciform recess (Torq-Set(R)) for rotary fastening devices. Metric series
Specifies maximum and minimum dimensional requirements for rotary fastening devices, and for associated drivers and gauges, for metric design.
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49.030.01 Fasteners for aerospace construction in general
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BS A 297:1987
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