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Bolt Torque Guide

Fastener Type Minimum
Tensile
Strength		 Material PRODUCTION TORQUE GUIDE
Body size of Outside Diameter
2 3 4 5 6 8 10 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2
Image1.jpg (1142 bytes) S.A.E 2 Steel 74000 P.S.I Low Carbon               6 12 20 32 47 69 96 155 206 310 480 675 900 1100
Image2.jpg (1317 bytes) S.A.E. 5 Steel 120000 P.S.I Medium Carbon Heat Treat               10 19 33 54 78 114 154 257 382 587 794 1105 1500 1775
Image3.jpg (1437 bytes) S.A.E. 7 Steel 133000 P.S.I. Medium Carbon Alloy               13 25 44 71 110 154 215 360 570 840 1325 1825 2500 3000
Image4.jpg (1482 bytes) S.A.E. 8 Steel 150000 P.S.I. Medium Carbon Alloy               14 29 47 78 119 169 230 380 600 900 1430 1975 2650 3200
Image5.jpg (1267 bytes) Socket Head
Cap Screw		 160000 P.S.I. High Carbon Quenched Tempered               16 33 54 84 125 180 250 400 640 970 1520 2850 2130 3450
Image10.jpg (894 bytes) Socket Set
Screw		 212000 P.S.I. High Carbon Quenched Tempered         9* 16* 30* 70* 140* 18 29 43 63 100 146            
Image8.jpg (1232 bytes) Machine Screw
Stainless		   18-8 2.6*  4* 5.5* 8* 10* 20* 23* 75* 132* 20 31 43 58 95 130 194 260 400 500   725
Image8.jpg (1232 bytes) Machine Screw
Stainless		   316 2.7* 4* 5.7* 8* 10* 22* 25* 80* 140* 22 34 46 60 100 135 210 280 425 515   750
Image7.jpg (1302 bytes) Machine Screw
Yellow Brass		 60000 P.S.I. CU 63 ZN 37 2* 3.3* 4.4* 6.4* 8* 16* 20* 65* 110* 17 27 37 49 78 104 160 215 325 400   595
Image8.jpg (1232 bytes) Silicone Bronze
Type "B"		 70000 P.S.I. CU 96 ZNI-5 Min. 2.3* 3.7* 4.9* 7.2* 10* 19* 22* 70* 125* 20 30 41 53 88 117 180 250 365 450   655
Image8.jpg (1232 bytes) Machine Screw
Aluminum		 55000 P.S.I. CU 3.8-4.9 1.2-1.8 MN .3-.9 1.4* 2.1* 2.9* 4.3* 5.4* 12* 15* 46* 82* 13 20 27 36 62 83 128 170 255 315   460
Image8.jpg (1232 bytes) Machine Screw
Monel		 82000 P.S.I. NI 67 CU 30 FE 1.4 2.5*                   4* 5.5* 8* 11* 21* 27* 87* 155* 23 36 50 67 115 155 235 315 475 585   850
Image8.jpg (1232 bytes) Sems Heat Treated Steel 120000 P.S.I. 1018 1022 4* 5* 7* 11* 15* 27* 37* 90* 200* 300*                      
Image11.jpg (1284 bytes) Studs Use SAE 2.5 and 8 values when grade is known, with nut of sufficient strength.

All figures are POUND FEET except those marked with an
ASTERISK ( * ) WHICH ARE pound inches.
These values are for lubricated fasteners.
Image12.jpg (1075 bytes) Tapping Screw Set up joint as it will be in production use 70% of over-torque failure as production specifications.

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