Wrench (spanner) sizes and differences

Sally Carroll

How many times have you sworn about wrench sizes and differences. Here is a table which will help, I hope. The machinists among us will already know but that leaves a large group who don't.

 
 

Wrench Jaw Gap comparison
Inches=Wrench size

0.250=1/4 AF
0.276=7 mm
0.313=5/16 AF
0.315=8 mm
0.344=11/32 AF, 1/8 Whitworth
0.354=9 mm
0.375=3/8 AF
0.394=10 mm
0.433=11 mm
0.438=7/16 AF
0.445=3/16 Whitworth, 1/4 BSF
0.472=12 mm
0.500=1/2 AF
0.512=13 mm
0.525=1/4 Whitworth, 5/16 BSF
0.551=14 mm
0.563=9/16 AF
0.591=15 mm
0.600=5/16 Whitworth, 3/8 BSF
0.625=5/8 AF
0.630=16 mm
0.669=17 mm
0.686=11/16 AF
0.709=18 mm
0.710=3/8 Whitworth, 7/16 BSF
0.748=19 mm
0.750=3/4 AF
0.813=13/16 AF
0.820=7/16 Whitworth, 1/2 BSF
0.866=22 mm
0.875=7/8 AF
0.920=1/2 Whitworth, 7/16 BSF
0.938=15/16 AF
0.945=24 mm
1.000=1 inch AF
1.010=9/16 Whitworth, 5/8 BSF
1.024=26 mm
1.063=1 1/16 AF, 27 mm
1.100=5/8 Whitworth, 11/16 BSF
1.125=1-1/8 AF
1.181=30 mm
1.200=11/16 Whitworth, 3/4 BSF
1.250=1-1/4 AF
1.260=32 mm
1.300=3/4 Whitworth, 7/8 BSF
1.313=1-5/16 AF
1.390=13/16 Whitworth, 15/16 BSF
1.417=36 mm
1.438=1-7/16 AF
1.480=7/8 Whitworth, 1 inch BSF
1.500=1-1/2 AF
1.575=40 mm, 15/16 Whitworth
1.614=41 mm
1.625=1-5/8 AF
1.670=1 inch Whitworth, 1-1/8 BSF
1.688=1/11/16 AF
1.811=46 mm
1.813=1-13/16 AF
1.860=1-1/8 Whitworth, 1-1/4 BSF
1.875=1-7/8 AF
1.969=50 mm
2.000=2 inch AF
2.050=1-1/4 Whitworth, 1-3/8 BSF
2.165=55 mm
2.362=60 mm