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BS 2059:1953
Specification for straight-sided splines and serrations (British Standard)
Dimensions of internal and external splines and of Full Form $7Igo$7R gauges and $7Inot go$7R feature gauges. Dimensions for straight-sided 90$0D serrations, line size $9H in to 6 in, serration $9D in to 6 in. Tables for shallow and deep splines, and for coarse serrations only. Three grades of fit.
British Standards Institution [bsi]