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Technical data for Hex bolts and screws, Inch series

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This product is regulated by the following standards:

Standard ASME B18.2.1 TABLE 2

Hex bolts and screws, Inch series

Dimensions in inches (1 inch=25.4 mm) source ASME B18.2.1 -  Table 2 Hex Bolts

Publication date: 2010
d Thread size
UNC (nr of threads x inch) UNF (nr of threads x inch) UN (nr of threads x inch) H basic E min
LT (l< 6")
 LT (l> 6")
G min
F basic
1/4
20 28 - 0.172 0.237
0.75
1
 0.484 0.438
5/16
18 24  - 0.219 0.298 0.875
1.125
 0.552 0.5
3/8
16 24  - 0.25 0.360
1
1.25
 0.620
0.563
7/16
1/2
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
3-1/4
3-1/2
3-3/4
4


The definitive version for the implementation of this standard is the edition bearing the most recent date of issue, obtainable from IFI – Industrial Fastener Institute, 6363 Oak Tree Blvd Independence, OH 44131, USA.
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