Specification Library

Stud & Bolt Thread Pitches

Bolt
Diameter in
Inches
Stud UN
Thread Per
Inch
Bolts UNC
Threads
Per Inch
Bolts UNF
Threads
Per Inch
Wrench
Size
Inches
1/4202028
5/16181824
3/8161624
7/16141420
1/21313207/8
9/16121218
5/81111181-1/6
3/41010161-1/4
7/899141-7/16
188121-5/8
1-1/887121-13/16
1-1/487122
1-3/886122-3/16
1-1/286122-3/8
1-5/882-9/16
1-3/4852-3/4
1-7/882-15/16
284-1/23-1/8
2-1/484-1/23-1/2
2-1/2843-7/8
2-3/4844-1/4
3844-5/8
3-1/484
3-1/284
3-3/484
484