1 4 Inch Bolt Torque

Clamp load estimated as 75 of proof load for specified bolts.

1 4 inch bolt torque. Recommended bolt torque table size recommended torque grade 2 grade 5 grade 8 18 8 s s bronze brass. Torque values calculated from formula t kdf. These figures represent an estimate of torque torque being the measurement of friction not tension required to induce given preload clamp load in a bolt. Sae grade 5 120 000 psi med.

Grade 2 calculations only cover fasteners 1 4 3 4 in diameter up to 6 long. Grade 2 5 and 8 values are for plated bolts. Grade 2 5 and 8 values are for slightly lubricated bolts. Fine thread figures are for 1 14.

Imperial grade 8 bolts allow a torque variance of 5 either way bolt size thread lb ft nm bolt size thread lb ft nm 1 4 inch nc 6 8 1 4 inch nc 8 11 1 4 inch nf 7 10 1 4 inch nf 11 13 5 16 inch nc 12 16 5 16 inch nc 16 21 5 16 inch nf 13 17 5 16 inch nf 17 24 3 8 inch nc 25 32 3 8 inch nc 33 44 3 8 inch nf 28 37 3 8 inch nf 37 50. Grade 2 grade 5 grade 8 18 8 s s bronze brass. Sae grade 3 100 000 psi med carbon steel. 9 8 2006 11 12 23 am.

Sae 0 1 2 74 000 psi low carbon steel. 23 section 6 appendix 12 21 01 rcr15 series rotary cutters 312 556m land pride section 6 appendix torque values chart for common bolt sizes in tpi1 n m2 ft lb3 n m ft lb n m ft lb mm x pitch4 n m ft lb n m ft lb n m ft lb 1 4 20 7 4 5 6 11 8 16 12 8 436597. Reference 2 below recommends a fastener preload in the range of 60 90 of the bolt material proof load. 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.

Fine thread figures are for 1 14. Us recommended bolt torque. Torque values for and 5 16 inch series are in inch pounds. D is the nominal diameter f is the clamp load k 0 15 for lubricated conditions k 0 18 for zinc plated and dry conditions.

These estimated torque values are derived from the standard torque formula torque kdf utilizing a standard free spinning nut non locknut with a proof strength equal to or greater than the tensile strength of the bolt. All other torque values are in foot pounds. Clamp loads are based on 75 of the minimum proof loads for each grade and size. Sizes from 1 4 up are in ft lbs.

For longer fasteners the torque is reduced significantly. Print this page.