Unified Inch Bolt and Cap Screw Torque Values

TS1671

Bolt or SAE Grade 1 SAE Grade 2a SAE Grade 5, 5.1 or 5.2 SAE Grade 8 or 8.2
Screw Lubricatedb Dryc Lubricatedb Dryc Lubricatedb Dryc Lubricatedb Dryc
Size N·m lb-in N·m lb-in N·m lb-in N·m lb-in N·m lb-in N·m lb-in N·m lb-in N·m lb-in
1/4 3.7 33 4.7 42 6 53 7.5 66 9.5 84 12 106 13.5 120 17 150
                          N·m lb-ft N·m lb-ft
5/16 7.7 68 9.8 86 12 106 15.5 137 19.5 172 25 221 28 20.5 35 26
                  N·m lb-ft N·m lb-ft        
3/8 13.5 120 17.5 155 22 194 27 240 35 26 44 32.5 49 36 63 46
      N·m lb-ft N·m lb-ft N·m lb-ft                
7/16 22 194 28 20.5 35 26 44 32.5 56 41 70 52 80 59 100 74
  N·m lb-ft                            
1/2 34 25 42 31 53 39 67 49 85 63 110 80 120 88 155 115
9/16 48 35.5 60 45 76 56 95 70 125 92 155 115 175 130 220 165
5/8 67 49 85 63 105 77 135 100 170 125 215 160 240 175 305 225
3/4 120 88 150 110 190 140 240 175 300 220 380 280 425 315 540 400
7/8 190 140 240 175 190 140 240 175 490 360 615 455 690 510 870 640
1 285 210 360 265 285 210 360 265 730 540 920 680 1030 760 1300 960
1-1/8 400 300 510 375 400 300 510 375 910 670 1150 850 1450 1075 1850 1350
1-1/4 570 420 725 535 570 420 725 535 1280 945 1630 1200 2050 1500 2600 1920
1-3/8 750 550 950 700 750 550 950 700 1700 1250 2140 1580 2700 2000 3400 2500
1-1/2 990 730 1250 930 990 730 1250 930 2250 1650 2850 2100 3600 2650 4550 3350
Torque values listed are for general use only, based on the strength of the bolt or screw. DO NOT use these values if a different torque value or tightening procedure is given for a specific application. For plastic insert or crimped steel type lock nuts, for stainless steel fasteners, or for nuts on U-bolts, see the tightening instructions for the specific application. Shear bolts are designed to fail under predetermined loads. Always replace shear bolts with identical grade. Replace fasteners with the same or higher grade. If higher grade fasteners are used, tighten these to the strength of the original. Make sure fastener threads are clean and that you properly start thread engagement. When possible, lubricate plain or zinc plated fasteners other than lock nuts, wheel bolts or wheel nuts, unless different instructions are given for the specific application.
aGrade 2 applies for hex cap screws (not hex bolts) up to 6. in (152 mm) long. Grade 1 applies for hex cap screws over 6 in. (152 mm) long, and for all other types of bolts and screws of any length.
b"Lubricated" means coated with a lubricant such as engine oil, fasteners with phosphate and oil coatings, or 7/8 in. and larger fasteners with JDM F13C zinc flake coating.
c"Dry" means plain or zinc plated without any lubrication, or 1/4 to 3/4 in. fasteners with JDM F13B zinc flake coating.

 

DX,TORQ1 -19-11DEC03-1/1