BS 1768 2

Equivalent standards: ASME B18.2.1

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Dimensions in inches (1 inch=25.4 mm) source BS 1768 Unified hexagon head screws washer faced
Publication date: 09 / 1963
d Thread size	Nr. of threads UNC	Nr. of threads UNF	k min	k max	e max	s min	s max
1/4	20	28	0.153	0.163	0.505	0.4305	0.4375
5/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
1-1/8
1-1/4
1-3/8
1-1/2
1-3/4
2

Reproduced by permission of DIN Deutsches Institut für Normung e. V. The definitive version for the implementation of this standard is the edition bearing the most recent date of issue, obtainable from Beuth Verlag GmbH, Burggrafenstraße 6, 10787 Berlin, Germany.
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Standard BS 1768 2