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The bolt is stressed up to the proofload value, and if there is no deformation, elongation, or fracture, then the bolt is deemed to have passed. For bolting specifications that do not have a published proofload, it is usually calculated at 92% of minimum yield strength.
Use Prevailing Torque All-Metal Nut chart if using this style of nut. = Nominal Diameter. = Clamp Load For J429 Grade 5 and 8, FNL Grade 9, A574, Class 4.6, 8.8, 10.9 and 12.9, the clamp loads are listed at 75% of the proof loads specified by the standard. For A307 Grade A, 75% of 36,000 PSI is utilized.
Tightening Torque Guide for Grade 5 & 8 Hex Cap Screws. This table is based on IFI 5th Edition Technical Data N-12/N-16, using Equation (1) and a torque coefficient, K=0.20 for non plated steel fasteners and K=0.15 for plated fasteners.
TIGHTENING TORQUE GUIDE based on IFI 5th Edition Technical Data N-12/N-16, using Equation (1) and a torque coefficient, K-0.20 for non-plated steel fasteners and K-0.15 for plated fasteners.
With a deeper drive than flat and rounded head screws, these withstand more torque for a tighter hold. 114 products.
The following chart estimates the applied tension clamp force at a defined torque and friction for SAE J429 Grade 2, 5 and 8 bolts. Notes: Clamp load estimated as 75% of proof load for specified bolts. Torque values for ¼ and 5/16-inch series are in inch-pounds. All other torque values are in foot-pounds.
