Extreme caution should be used when using a formula for torque/ tension relationships. Torque is only an indirect indication of tension. Under/over tightening of fasteners can result in costly …

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.

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 ...

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.

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.

Grade 2, 5, and 8 values are for slightly lubricated bolts.

The charts below show the ideal tightening torque for each bolt grade for a variety of sizes. The size column also includes the thread count. Identify the grade, size, and thread density of your bolts and refer to the tightening torque columns.

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.

These metric bolt torque charts show the ideal tightening torque for class 8.8, 10.9, and 12.9 bolts for both wet and dry tightening. The bolt’s class indicates its material strength, with higher numbers meaning higher tensile and yield strength.

Mar 13, 2025 · How to Read a Imperial Set Screw Size (Example: 1/4-20 x 1) 1/4: The nominal thread diameter is 1/4 inch. 20: The thread pitch is 20 threads per inch (TPI). 1: The screw length is 1 inch. Specific Set Screw Size Charts for Different Point/Drive Types. Each type of set screw can have slightly different size standards based on its point style, drive type, and intended …