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 in these charts is advisory only, and its use by anyone is voluntary.

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 joint or the amount of fastener lubrication. This table is offered as the suggested maximum torque values for threaded products and is only a guide.

Due to many variables that affect the torque-tension relationship like human error, surface texture, and lubrication the only way to determine the correct torque is through experimentation under actual joint and assembly conditions.

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-tension relationship.

Stainless Steel and Non-Ferrous are suggested maximum torque values based on actual lab testing. Stainless steel fasteners tend to gall while being tightened.

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. The foot-pound column at the left increases in 10 ft.-ib. Increments from 0 to 110 ft.-ibs.

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-tension relationship. The above recommended clamp loads are based on 75% of the minimum specified proof loads for each grade and size.

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

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.

Torque Reference Chart Metric (ISO 898) - Inch (SAE J429) Note: These charts are provided as a Reference only. Always refer to vehicle manufactures recommended Torque setting for the specific application. XRF Inc. has made every effort to insure the data provided in these charts is …