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  2. Tightening Torque. K = 0.15 K = 0.17 K = 0.20. TORQUE-TENSION REFERENCE GUIDE. #1 #2 #3 #4 #5 #6 #8 #10 1/4 5/16 3/8 7/16 1/2 5/8 3/4 7/8 0.0730 0.0860 0.0990 0.1120 0.1250 0.1380 0.1640 0.1900 0.2500 0.3125 0.3750 0.4375 0.5000 0.6250 0.7500 0.8750 1.0000 1.2500 1.5000. 64. 56. 48. 40. 32. 24. 20. 18. 16. 14. 13. 11. 10. 3.0 in-lbs. 3.4 in-lbs.

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    • ASTM A307. Proof Load (lbs)1. Clamp Load (lbs)2. Tightening Torque (ft lbs) Galv+Waxed. Galv. Plain. 1⁄4 20 1,053. 790 2 4 3 5⁄16 18 1,735. 1,302 8 7 3⁄8 16 2,567. 1,925.
    • SAE Grade 2. Proof Load (lbs) 1. Clamp Load (lbs) 2. Tightening Torque (ft lbs) Galv+Waxed. Galv. Plain. 1⁄4 20 1,750. 1,313 3 7 5 5⁄16 18 2,900. 2,175 6 14 11 3⁄8 16 4,250.
    • ASTM A325. Tension. Tightening Torque Range (ft lbs) (Min - Max) Min. Max. Galv+Waxed. Plain. 1⁄2 13 12,000. 14,000. 50 - 58. 100 - 117. 5⁄8 11 19,000. 23,000. 99 - 120.
    • ASTM A449 / SAE Grade 5* Proof Load (lbs) 1. Clamp Load (lbs) 2. Tightening Torque (ft lbs) Galv+Waxed. Galv. Plain. 1⁄4 20 2,700. 2,025 4 11 8 5⁄16 18 4,450. 3,338.
  3. BOLT CLAMP LOADS. Diameter & Threads Per Inch. 1/4-20 1/4-28 5/16-18 5/16-24 3/8-16 3/8-24 7/16-14 7/16 20 1/2-13 1/2-20 9/16-12 9/16-18 5/8-11 5/8-18 3/4-10 3/4-16 7/8-9 7/8 14 1-8 1-14. Suggested Assembly Torque Values. USS/SAE GRADE 5. When using anti-seize, reduce the lubed chart reading by 20% to properly torque.

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  4. Find the ideal tightening torque for different sizes and grades of SAE bolts. Compare the bolt markings, material strength, and proof load of grade 2, grade 5, and grade 8 bolts.

  5. Maximum Tightening Torques for US Imperial Bolts. This table shows values for threads that have been lightly oiled and the tension is 70% of yield strength. For dry bolts, the values should be increased by 30%. Size (in) Recommended Maximum Tightening Torque (lb-ft) SAE Grade 2. SAE Grade 5. SAE Grade 8.

  6. Learn how to calculate bolt torque based on material strength, thread engagement, and nut factor. See a chart with torque values for different bolt grades and diameters.

  7. Remember, you may need to vary these numbers somewhat based on the individual joint or the amount of fastener lubrication. This table is offered as the suggested maximum torque values for threaded products and is only a guide. Torque Values = inch-lbs. Bolt Size. 18-8 Stainless Steel.

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