Metric Bolt and Cap Screw Torque Values
|
| Class 4.8 | Class 8.8 or 9.8 | Class 10.9 | Class 12.9 | |||||
|---|---|---|---|---|---|---|---|---|
| Size | Lubricateda N·m (lb-ft) | Dryb N·m (lb-ft) | Lubricateda N·m (lb-ft) | Dryb N·m (lb-ft) | Lubricateda N·m (lb-ft) | Dryb N·m (lb-ft) | Lubricateda N·m (lb-ft) | Dryb N·m (lb-ft) |
| M6 | 4.7 (3.5) | 6 (4.4) | 9 (6.6) | 11.5 (8.5) | 13 (9.5) | 16.5 (12.2) | 15.5 (11.5) | 19.5 (14.5) |
| M8 | 11.5 (8.5) | 14.5 (10.7) | 22 (16) | 28 (20.5) | 32 (23.5) | 40 (29.5) | 37 (27.5) | 47 (35) |
| M10 | 23 (17) | 29 (21) | 43 (32) | 55 (40) | 63 (46) | 80 (59) | 75 (55) | 95 (70) |
| M12 | 40 (29.5) | 50 (37) | 75 (55) | 95 (70) | 110 (80) | 140 (105) | 130 (95) | 165 (120) |
| M14 | 63 (46) | 80 (59) | 120 (88) | 150 (110) | 175 (130) | 220 (165) | 205 (150) | 260 (190) |
| M16 | 100 (74) | 125 (92) | 190 (140) | 240 (175) | 275 (200) | 350 (255) | 320 (235) | 400 (300) |
| M18 | 135 (100) | 170 (125) | 265 (195) | 330 (245) | 375 (275) | 475 (350) | 440 (325) | 560 (410) |
| M20 | 190 (140) | 245 (180) | 375 (275) | 475 (350) | 530 (390) | 675 (500) | 625 (460) | 790 (580) |
| M22 | 265 (195) | 330 (245) | 510 (375) | 650 (480) | 725 (535) | 920 (680) | 850 (625) | 1080 (800) |
| M24 | 330 (245) | 425 (315) | 650 (480) | 820 (600) | 920 (680) | 1150 (850) | 1080 (800) | 1350 (1000) |
| M27 | 490 (360) | 625 (460) | 950 (700) | 1200 (885) | 1350 (1000) | 1700 (1250) | 1580 (1160) | 2000 (1475) |
| M30 | 660 (490) | 850 (625) | 1290 (950) | 1630 (1200) | 1850 (1350) | 2300 (1700) | 2140 (1580) | 2700 (2000) |
| M33 | 900 (665) | 1150 (850) | 1750 (1300) | 2200 (1625) | 2500 (1850) | 3150 (2325) | 2900 (2150) | 3700 (2730) |
| M36 | 1150 (850) | 1450 (1075) | 2250 (1650) | 2850 (2100) | 3200 (2350) | 4050 (3000) | 3750 (2770) | 4750 (3500) |
| a "Lubricated" means coated with a lubricant such as engine oil, or fasteners with phosphate and oil coatings. | ||||||||
| b "Dry" means plain or zinc plated without any lubrication. | ||||||||
| DO NOT use these values if a different torque value or tightening procedure is given for a specific application. Torque values listed are for general use only. Check tightness of fasteners periodically. | Make sure fastener threads are clean and that you properly start thread engagement. This will prevent them from failing when tightening. |
| Shear bolts are designed to fail under predetermined loads. Always replace shear bolts with identical property class. | Tighten plastic insert or crimped steel-type lock nuts to approximately 50 percent of the dry torque shown in the chart, applied to the nut, not to the bolt head. Tighten toothed or serrated-type lock nuts to the full torque value. |
| Fasteners should be replaced with the same or higher property class. If higher property class fasteners are used, these should only be tightened to the strength of the original. |
DX,TORQ2 -19-01OCT99-1/1 |