Square Bolt (UNC series)

Standard ANSI B18.2.1
Description Square Bolt (UNC series) 1/4x20x0.75 - ANSI B18.2.1
Part number ANSI B18.2.1 - SB - UNC - NS 1/4 x L 0.75
Product selection
Selector Nominal Ø (in.) Threads per inch Thread length (in.)
1 1/4 20 0.75
2 5/16 18 0.875
3 3/8 16 1
4 7/16 14 1.125
5 1/2 13 1.25
6 5/8 11 1.5
7 3/4 10 1.75
8 7/8 9 2
9 1 8 2.25
10 1 1/8 8 2.5
11 1 1/4 7 2.75
12 1 3/8 6 3
13 1 1/2 6 3.25
Nominal Ø (in.)
Threads per inch
Thread length (in.)