BS 4174 12

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Dimensions in mm - source BS 4174 Table 12 80° slotted raised countersunk head tapping screws: Publication date: 10 - 1972
Ø thread size	dk min	dk mx	k max	t nom	n min	n max	f nom
ST 2.2	3.73	4.37	1.3	1.04	0.58	0.79	0.64
ST 2.9	4.95	5.71	1.7	1.37	0.79	0.99	0.84
ST 3.5
ST 4.2
ST 4.8
ST 5.5
ST 6.3
ST 8

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 4174 12