1 4 Inch Bolt Torque

Most bolt torque charts including this one are based on the material strength of the bolt the component containing the external thread.

1 4 inch bolt torque. Torque values calculated from formula t kdf. Sae grade 3 100 000 psi med carbon steel. All other torque values are in foot pounds. Sizes from 1 4 up are in lb ft.

Grade 2 grade 5 grade 8 18 8 s s bronze brass. Print this page. Sae grade 5 120 000 psi med. Torque values for and 5 16 inch series are in inch pounds.

Grade 2 calculations only cover fasteners 1 4 3 4 in diameter up to 6 long. 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. Clamp load estimated as 75 of proof load for specified bolts. Sizes from 1 4 up are in ft lbs.

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. Coarse fine coarse fine coarse fine coarse fine coarse fine coarse fine 4 5 2 4 8. Fine thread figures are for 1 14. 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.

Grade 2 5 and 8 values are for slightly lubricated bolts. 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. 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. Us recommended bolt torque.

9 8 2006 11 12 23 am. For longer fasteners the torque is reduced significantly. 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.

Clamp loads are based on 75 of the minimum proof loads for each grade and size. Sae 0 1 2 74 000 psi low carbon steel.