bolt torque chart general specs

6 “ P R O F E S S I O N A L S S E R V I N G P R O F E S S I O N A L S ”

TORQUE GUIDE CHART

TE

CH

NIC

AL

BOLTSIdentification • Strength • Clamp • Torque • Materials

GRADE 2

Proof Yield TensileDiameter Load Strength Strength1/4"-3/4" 55,000 57,000 74,0003/4" - 1-1/2" 33,000 36,000 60,000

Low or Medium Carbon Steel

Clamp Assembly Torque Min.Load Dry Lub Tensile

Size (lb) (ft lb) (ft lb) (lb)1/4 - 20 1320 6 5 27001/4 - 28 1500 7 6 29005/16 - 18 2160 11 11 44005/16 - 24 2400 12 12 47003/8 - 16 3200 20 15 64003/8 - 24 3620 23 17 88001/2 - 13 5850 50 35 115001/2 - 20 6600 55 40 125005/8 - 11 9350 100 75 185005/8 - 18 10550 110 85 200003/4 - 10 13800 175 130 270003/4 - 16 15400 200 150 290007/8 - 9 11450 170 125 300001 - 8 15000 250 190 395001-1/8 - 7 18900 350 270 500001-1/4 - 7 24000 500 380 630001-3/8 - 6 28600 670 490 755001-1/2 - 6 34800 870 650 91000

A325GRADE 5

Proof Yield TensileDiameter Load Strength Strength1/4"-1" 85,000 92,000 120,0003/4" - 1-1/2" 74,000 81,000 105,000Medium Carbon Steel, Quenched and Tempered

Clamp Assembly Torque Min.Load Dry Lub Tensile

Size (lb) (ft lb) (ft lb) (lb)1/4 - 20 2000 8 7 44501/4 - 28 2300 10 8 48405/16 - 18 3350 17 13 71905/16 - 24 3700 19 14 76703/8 - 16 4950 30 23 105303/8 - 24 5600 35 25 144001/2 - 13 9000 75 55 190001/2 - 20 10500 90 65 205005/8 - 11 14400 150 110 301005/8 - 18 16370 180 130 326003/4 - 10 21300 260 200 442003/4 - 16 23800 300 220 474007/8 - 9 29450 320 320 531001 - 8 38600 640 480 695001-1/8 - 7 42300 800 600 878001-1/4 - 7 53800 1120 840 1103001-3/8 - 6 64100 1460 1100 1322001-1/2 - 6 78000 1910 1460 159600

325 325

H5CZ

GRADE 8

Proof Yield TensileLoad Strength Strength

120,000 130,000 150,000

Carbon Alloy Steel, Quenched and Tempered

Clamp Assembly Torque Min.Load Dry Lub Tensile

Size (lb) (ft lb) (ft lb) (lb)1/4 - 20 2850 12 9 66001/4 - 28 3250 14 10 72005/16 - 18 4700 25 18 107005/16 - 24 5200 25 20 115003/8 - 16 7000 45 35 158003/8 - 24 7900 50 35 216001/2 - 13 12750 110 80 286001/2 - 20 14370 120 90 308005/8 - 11 20350 220 170 452005/8 - 18 23000 240 180 490003/4 - 10 30100 380 280 663003/4 - 16 33500 420 320 711007/8 - 9 41600 600 460 910001 - 8 54500 900 680 1192001-1/8 - 7 68900 1280 960 1505001-1/4 - 7 87200 1820 1360 189200]1-3/8 - 6 104000 2380 1780 2267001-1/2 - 6 126500 3160 2360 273600

THREADED ROD DATA

Stressed Steel Strength (lb)Rod Cross ASTM A 307 Rod (Grade 2) Stainless Steel (Grade 304 or 316)Diameter Section Yield Tensile Shear Yield Tensile Shear(inch) (sq inch) Strength Strength Strength Strength Strength Strength1/4 0.0318 1,145 1,908 1,259 954 2,385 1,5903/8 0.0775 2,790 4,650 3,069 2,325 5,813 3,8751/2 0.1419 5,108 8,514 5,619 4,257 10,653 7,0955/8 0.226 8,136 13,560 8,950 6,780 16,950 11,3303/4 0.334 12,024 20,040 13,226 10,020 25,050 16,7007/8 0.462 16,632 27,720 18,295 13,860 34,650 23,1001 0.606 21,816 36,360 23,998 18,180 45,450 30,3001-1/4 0.969 34,884 58,140 38,372 29,070 72,675 48,4501-1/2 1.045 37,620 62,700 41,382 31,350 78,375 52,250

Yield Strength is the load at which thefastener exhibits a specified elongationat a specific load.

Tensile Strength is the minimum totalload that will fail the fastener.

Clamp Load – 75% x Proof x StressArea. Also called the fastener preloador initial load. The ‘Clamp’ Load is thetrue maximum load of any fastener.

Proof Load is the load which thefastener must withstand without apermanent set.

Torque Dry assumes a coefficient offriction of 0.20.

Torque Lubricated assumes a coefficient of friction of 0.15.

Minimum Tensile – minimum load atwhich the fastener will fail. Minimumsafe working load is 4:1.

A325 is the designation for ‘structural’Grade 5 bolts which have larger headdimensions.

“ ‘I can’t do it’ never yet accomplished anything; ‘I will try’ hasperformed wonders.”

GEORGE P. BURNHAM

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