Bolt Torque Table

An useful chart to find out the capacity of the heavy structural bolts. The Bolt Torque Table below provides information such as tension, torque, TPI for the heavy structured bolts against its corresponding bolt sizes (ranging from 1/2 to 1 1/2). ASTM A325 is an ASTM (American Society of the International Association for Testing and Materials) International standard for heavy hex structural bolts. It is specified for Heat Treated 830 MPa Minimum Tensile Strength.

ASTM A325 Bolt Torque Chart

Bolt Size TPI Tension Tightening Torque Range (ft lbs) (Min - Max)
Min Max Galv+Waxed Plain
12 13 12,000 14,000 50 - 58 100 - 117
58 11 19,000 23,000 99 - 120 198 - 240
34 10 28,000 34,000 175 - 213 350 - 425
78 9 39,000 47,000 284 - 343 569 - 685
1 8 51,000 61,000 425 - 508 850 - 1,017
118 7 56,000 67,000 525 - 625 1,050 - 1,256
114 7 71,000 85,000 740 - 885 1,479 - 1,771
138 6 85,000 102,000 974 - 1,169 1,948 - 2,338
112 6 103,000 124,000 1,288 - 1,550 2,575 - 3,100

ASTM A325 Bolt Torque Chart displays the torque range for different bolt sizes. These types of bolts has three types. The materials used for type 1 is medium carbon, type 2 contains low carbon and Martensite, type 3 contains weathering steel.


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