Heavy Hex Bolts Wrench Size

Find information on wrench sizes for imperial and metric heavy hex bolts.

Imperial Heavy Hex Bolt Wrench Size
Size ASME B18.2.1
1/4" 1/2"
5/16" 9/16"
3/8" 11/16"
1/2" 3/4"
5/8" 7/8"
3/4" 15/16"
7/8" 1-1/76"
1" 1-5/8"
1-1/8" 1-13/16"
1-1/4" 2"
1-3/8" 2-3/16"
1-1/2" 2-3/8"
1-5/8" 2-9/16"
1-3/4" 2-3/4"
1-7/8" 2-15/16"
2" 3-1/8"
2-1/4" 3-1/2"
2-1/2" 3-7/8"
2-3/4" 4-1/4"
3" 4-5/8"
3-1/4" 5"
3-1/2" 5-3/8"
3-3/4" 5-3/4"
4" 6-1/8"
Metric Heavy Hex Bolt Wrench Size
Size ASME B18.2.3.6M
M12 21mm
M14 24mm
M16 27mm
M20 34mm
M22 36mm
M24 41mm
M27 46mm
M30 50mm
M36 60mm