If using API bolting requirements, refer to applicable API specification for tightening torque values. These recommendations are for non-gasketed metal-to-metal joints. CAUTION: All material included …

Torque specifications, especially for critical joints, should be determined under actual assembly conditions due to the many variables involved which are difficult to predict and do affect the torque …

The following suggested tightening torques provide an excellent starting point for determining torque requirements. Remember, you may need to vary these numbers somewhat based on the individual …

Torque values for various grades and diameters of fasteners.

Cross-reference the bolt size and grade to find the recommended torque value. The chart provides torque specifications in inch-pounds (in.-lbs.) or foot-pounds (ft-lb).

Bolt Torque Chart showing suggested torque values and corresponding bolt clamping forces for various sizes and specifications of fasteners.

There are many varying factors which affect torque. The figures in this chart are safe figures for standard torque applications only. The chart below can be used to convert foot-pounds to meter-kilograms. …

Bolt torque chart reference guides include Grade 2, B7, A307, A325, Grade 8, A490, and Grade 5. AFT Fasteners is your trusted source for fastener information.

Dec 10, 2025 · Find torque specs for every major U.S. bolt size—including 1/2 bolt torque, 5/16 bolt torque, and 3/8 bolt torque—with clear tables for coarse and fine threads in Grades 2, 5, 8, stainless, …

Bolt torque depends on: Bolt size, type and grade Lubrication (a low friction factor must be considered with MoS2-based grease) The given bolt torques are based on the 90% of the bolt yield strength