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AFT Fasteners provides a helpful resource on socket set screw sizes / dimensions, material, heat treatment, hardness and torsional strength.
4) Torque values for F835 Countersunk and Button Head, Alloy Steel Socket Shoulder and Alloy Steel Low Head Socket Head Cap Screw are given for “as-received” screws in rigid joints when torqued with standard hex keys; all are listed in inch-pounds. 5) Stainless Steel and Non-Ferrous are suggested maximum torque values based on actual lab testing.
For Torsional Holding Power (THP), Multiply Axial Holding Power (AHP) by Shaft Radius (R). Formula: THP=AHP x R.
Table 17: Install torque values for self-tapping screws. ..... 23 Table 18: Segmented card retainer (“wedgelok”) torque values (in-lbs unless otherwise specified). ....... 23 Table 19: Steel straight thread port end assembly
Metric screw torque specifications for a large variety of fasteners. Details for Socket screw head size, Hex key or wrench drive size, hardness and tensile strengths for screws including Button Head, Socket Head Cap, Low Head Socket, Set Screws and Flat Head socket screws.
STUDS Use SAE 2, 5 or 8 values when grade is known, with a nut of sufficient strength. There is no difference in the above chart between the torque figures for fine or coarse threads.
the value of the clamping force is usually referred to as the tightening torque. As the clamping force is a linear function of both the turning angle of the screw and the pitch of the thread, there is a direct relation between the clamping force and the tightening torque within the elastic range of the screw elongation. However, only
