Inch wrench screw specification
Hand size hexagonal socket circle hexagonal countersunk hexagonal socket half hexagonal socket tight hexagonal socket cylinder
Inch column head screw Head screw Round head screw Set screw Head shoulder screw
( cup Head) (flat cup) (round cup) (machine meter) (stopper)
0.028 0#
0.035 0# 0# 1#, 2#
0.05 0# 1#, 2# 1#, 2# 3#, 4#
1/16 1# 3#, 4# 3#, 4# 5#, 6#, (1/8)
5/64 2#, 3# 5#, 6# 5#, 6# 8#, (5/32)
3/32 4#, 5#, (1/8) 8# 8# 10#, (3/16)
7/64 6#
1/8 (5/32) 10#, (3/16) 10#, (3/16) 1/4, (1/4) 1/4
9/64 8#
5/32 10#, (3/16) 1/4, (1/4) 1/4, (1/4) 5/16, (5/16) 5/16
3/16 1/4, (1/4) 5/16, (5/16) 5/16, (5/16) 3/8, (3/8) 3/8
7/32 5/16, (5/16) 3/8, (3/8) 3/8, (3/8) 7/16
1/4 7/16, (7/16) 7/16, (7/16) 1/2, (1/2) 1/2
5/16 3/8, (3/8, 7/16) 1/2, (1/2) 1/2, (1/2) 5/8 5/8
3/8 7/16, 1/2, (1/2) 5/8, (5/8) 5/8, (5/8) 3/4 3/4
7/16
1/2 5/8, (5/8) 3/4 7/8 1
9/16 3/4, (3/4, 7/8) 7/8 1, 11/8
5/8 (1) 1 11/4, 13/8 11/4
3/4 7/8, 1 11/8 11/2
7/8 11/4
1 11/2
Remarks: The brackets () indicate inch BSW specifications, and others indicate inch UNC specifications