Hexagon Nut and Bolt Sizes

Determine the maximum torque according to bolt (nut) size and grade. Always consult the manufacturers instructions or engineering recommendations when making bolted connections.

Important: the hexagon sizes shown in the tables should be used as a guide only. Individual sizes should be checked before specifying any equipment.

Use only Heavy Duty Impact Sockets for power driven torquing equipment, according to ISO2725 and ISO1174, DIN3129 and DIN3121 or ASME-B107.2/1995.

 
METRIC SIZES

Thread Size D (mm)

Hexagon Size S (mm)

Hexagon Size J (mm)
M 10 17 8
M 12 19 10
M 14 22 12
M 16 24 14
M 18 27 14
M 20 30 17
M 22 32 17
M 24 36 19
M 27 41 19
M 30 46 22
M 33 50 24
M 36 55 27
M 39 60 27 (30)
M 42 65 32
M 45 70 -
M 48 75 36
M 52 80 36
M 56 85 41
M 60 90 46
M 64 95 46
M 68 100 50
M 72 105 55
M 76 110 60
M 80 115 65
M 85 120 70
M 90 130 70 (75)
M 95 135 -
M 100 145 85
M 105 150 -
M 110 155 -
M 115 165 -
M 120 170 -
M 125 180 -
M 130 185 -
M 140 200 -
M 150 210 -
 
IMPERIAL SIZES

Thread Size D (inch)

Hexagon Size S * (inch)

Hexagon Size J (inch)
5/8" 1 1/16" 1/2"
3/4" 1 1/4" 5/8"
7/8" 1 7/16" 3/4"
1" 1 5/8" 3/4"
1 1/8" 1 13/16" 7/8"
1 1/4" 2" 7/8"
1 3/8" 2 3/16" 1"
1 1/2" 2 3/8" 1"
1 5/8" 2 9/16" -
1 3/4" 2 3/4" 1 1/4"
1 7/8" 2 15/16" 1 3/8"
2" 3 1/8" 1 5/8"
2 1/4" 3 1/2" 1 3/4"
2 1/2" 3 7/8" 1 7/8"
2 3/4" 4 1/4" 2"
3" 4 5/8" 2 1/4"
3 1/4" 5" 2 1/4"
3 3/4" 5 3/4" 2 1/4"
* Heavy hexagon nuts.
POWERFUL SOLUTIONS. GLOBAL FORCE.