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BS 3409-1:1961
M00000280
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BS 3409-1:1961 Specification for the tapping of holes to receive wire thread inserts (UNC and UNF threads). Diameters 3/16 in and over
standard by BSI Group, 08/16/1961
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Specifies limits of size for tapped holes to accommodate wire thread inserts to provide thread sizes from 3/16 in to 1 in UNC inclusive and from 3/16 in to 1 in UNF inclusive. It includes recommendations for general dimensions and limits of size on the threaded portion of screwing taps intended to produce holes to the limits specified, together with details of a recommended gauging system for checking them.Cross References:
BS 919:Part 1
BS 949
BS 1044
BS 1580