ASME B18.2.1 TABLE 6

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Dimensions in inches (1 inch=25.4 mm) sourceASME B18.2.1 table 6 Hex Cap Screws
Publication date: 2010
d Thread size	UNC (nr of threads x inch)	UNF (nr of threads x inch)	UN (nr of threads x inch)	E min	E max	F basic	G min	G max	H basic	LT (l< 6')	LT (l> 6')
1/4	20	28	-	0.245	0.250	0.438	0.488	0.505	0.156	0.75	1
5/16	18	24	-	0.306	0.315	0.5	0.557	0.577	0.203	0.875	1.125
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
1-5/8
1-3/4
1-7/8
2
2-1/4
2-1/2
2-3/4
3

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 ASME B18.2.1 TABLE 6