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UNC Bolt Calculator
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Size
UNC 0.073-64 (#1)
UNC 0.086-56 (#2)
UNC 0.099-48 (#3)
UNC 0.112-40 (#4)
UNC 0.125-40 (#5)
UNC 0.138-32 (#6)
UNC 0.164-32 (#8)
UNC 0.190-24 (#10)
UNC 0.216-24 (#12)
UNC 0.2500-20 (1/4")
UNC 0.3125-18 (5/16")
UNC 0.3750-16 (3/8")
UNC 0.4375-14 (7/16")
UNC 0.5000-13 (1/2")
UNC 0.5625-12 (9/16")
UNC 0.6250-11 (5/8")
UNC 0.7500-10 (3/4")
UNC 0.8750-9 (7/8")
UNC 1.000-8 (1")
UNC 1.125-7 (1 1/8")
UNC 1.250-7 (1 1/4")
UNC 1.375-6 (1 3/8")
UNC 1.500-6 (1 1/2")
UNC 1.750-5 (1 3/4")
UNC 2.000-4.5 (2")
UNC 2.250-4.5 (2 1/4")
UNC 2.500-4 (2 1/2")
UNC 2.750-4 (2 3/4")
UNC 3.000-4 (3")
UNC 3.250-4 (3 1/4")
UNC 3.500-4 (3 1/2")
UNC 3.750-4 (3 3/4")
UNC 4.000-4 (4")
Class of Fit (Bolt - Nut)
1A
2A
3A
-
1B
2B
3B
Tensile Strength of Bolt Material
p.s.i.
Tensile Strength of Nut Material
p.s.i.
Desired Tensile Stress in Bolt
p.s.i.
Nut Factor
Length of Engagement
inches
Static Load
pounds
If you can't decide, just click on "Calculate Now" and the calculator will fill in some appropriate defaults.
Click on "Help" for descriptions of what everything means.
Help
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