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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.
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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 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.
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The torque values can only be achieved if nut (or tapped hole) has a proof load greater than or equal to the bolt's minimum ultimate tensile strength. Clamp load calculated as 75% of the proof load when specified by the standard. ASTM A307 utilized 75% of 36,000 PSI. Torque values for 1/4 and 5/16-in series are in inch-pounds.
The following chart estimates the applied tension clamp force at a defined torque and friction for SAE J429 Grade 2, 5 and 8 bolts.