Tightening fasteners

When a capscrew or bolt is tightened to its specified torque, or a nut is tightened to its torque value on a bolt, the shank of the capscrew or bolt stretches slightly. This stretching (tensioning) results in a preload. OEM-specific torque values are calculated to provide enough clamping force on bolted components and the correct tension on the fastener to maintain the clamping force.

Recommended reading: suspension systems