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United States Standard Dimensions Of Bolts And Nuts
































































































































































































































































































Bolt. Bolt Head and Nut.
Diameter. Standard Number of threads per inch Long diameter, I, or diameter across corners Short diameter of hexagon and square, or width across J Depth of Nut, H Depth of bolt head, K
Nominal. D. Effective. * Hexagon Square
1/4 .185 20 9/16 23/32 1/2 1/4 1/4
5/16 .240 18 11/16 27/32 19/32 5/16 19/64
3/8 .294 16 25/32 31/32 11/16 3/8 11/32
7/16 .345 14 29/32 1-3/32 25/32 7/16 25/64
1/2 .400 13 1 1-1/4 7/8 1/2 7/16
9/16 .454 12 1-1/8 1-3/8 31/32 9/16 31/64
5/8 .507 11 1-7/32 1-1/2 1-1/16 5/8 17/32
3/4 .620 10 1-7/16 1-3/4 1-1/4 3/4 5/8
7/8 .731 9 1-21/32 2-1/32 1-7/16 7/8 23/32
1 .837 8 1-7/8 2-5/16 1-5/8 1 13/16
1-1/8 .940 7 2-3/32 2-9/16 1-13/16 1-1/8 29/32
1-1/4 1.065 7 2-5/16 2-27/32 2 1-1/4 1
1-3/8 1.160 6 2-17/32 3-3/32 2-3/16& 1-3/8 1-3/32
1-1/2 1.284 6 2-3/4 3-11/32 2-3/8 1-1/2 1-3/16
1-5/8 1.389 5-1/2 2-31/32 3-5/8 2-9/16 1-5/8 1-9/32
1-3/4 1.491 5 3-3/16 3-7/8 2-3/4 1-3/4 1-3/8
1-7/8 1.616 5 3-13/32 4-5/32 2-15/16 1-7/8 1-15/32
2 1.712 4-1/2 3-19/32 4-13/32 3-1/8 2 1-9/16
2-1/4 1.962 4-1/2 4-1/32 4-15/16 3-1/2 2-1/4 1-3/4
2-1/2 2.176 4 4-15/32 5-15/32 3-7/8 2-1/2 1-15/16
2-3/4 2.426 4 4-29/32 6 4-1/4 2-3/4 2-1/8
3 2.629 3-1/2 5-11/32 6-17/32 4-5/8 3 2-5/16
3-1/4 2.879 3-1/2 5-25/32 7-1/16 5 3-1/4 2-1/2
3-1/2 3.100 3-1/4 6-7/32 7-19/32 5-3/8 3-1/2 2-11/16
3-3/4 3.317 3 6-5/8 8-1/8 5-3/4& 3-3/4 2-7/8
... 3.567 3<