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DIN 240-1923 vs BS 84

The Whitworth threads specified in DIN 240-1923 are technically equilivant to the Whitworth threads specified in BS 84, however, BS 84 has more complete data.

DIN 240-1923 does not contain complete Whitworth thread specifications. Specification DIN 240-1923 identifies only the basic thread configuration but does not specify the tolerance limits of the thread. When considering thread gages for parts made to the DIN 240-1923, the standard only gives the data for the GO member of the gage. The specification does not give the data for the NOGO member of the gage. In other words, the specification only gives half the information required.

BS 84 is more commonly used when Whitworth threads are required. The Whitworth thread form was developed in the United Kingdom, which is where the BS 84 standard was written. BS 84 does give complete thread data and thus is a better specification to reference when Whitworth threads are required.

If you think that the above data requires any correction e-mail gageguy@gagecrib.com.

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