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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.
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.
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.
For J429 Grade 5 and 8, H-K 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.
12 Αυγ 2024 · This article provides the information for choosing the correct bolt tightening torque for standard bolt sizes.
Because there are many variables that affect the torque-tension relationship, the only way to determine the correct torque is through experimentation under actual joint and assembly conditions. Bolt torque chart reference guides include Grade 2, B7, A307, A325, Grade 8, A490, and Grade 5.
3/4" - 16 11/16 0.6875 420 320 7/8" - 9 49/64 0.7656 600 460 7/8" - 14 13/16 0.8125 660 500 1" - 8 7/8 0.875 900 680 1" - 12 59/64 0.9219 1000 740 1" - 14 15/16 0.9375 1020 760 Lubricated Includes: Lubricants - Plating - Hardened Washers Tap Drills: Allow Approximately 75% Full Thread Grade 8 Bolt Drill & Torque Chart in Foot Pounds This ...
