GENERAL / Tightening TIGHTENING BOLTS AND NUTS CAUTION: Use tools appropriate for the work to be done. Makeshift tools and procedures can create safety hazards. For loosening and tightening nuts and bolts, use correct size tools. Otherwise, tightening tools may slip, potentially causing personal injure. NOTE: Apply lubricant (e.g. white zinc B dissolved into spindle oil) to bolts and nuts to reduce friction coefficient of them. Make sure bolt and nut threads are clean before installing. Bolt Types Tighten the nuts or bolts correctly to the torque specifications.
As the different types and grades of bolt are used, use and tighten the correct bolts correctly when assembling the machine or components. SA-040 Specified Tightening Torque W1-2-1 Bolt Dia.
Wrench Size Hexagon Wrench Size M552-07-091 M552-07-090 Socket Bolt M552-07-092 N⋅m (kgf⋅m) (lbf⋅ft) N⋅m (kgf⋅m) (lbf⋅ft) N⋅m (kgf⋅m) (lbf⋅ft) M6 10 5 3.3 to 4.2 (0.3 to 0.4) (2.4 to 3.0) M8 13 6 30 (3.0) (22.5) 20 (2.0) (14.5) 10 (1.0) (7.2) M10 17 8 65 (6.5) (47) 50 (5.0) (36) 20 (2.0) (14.5) M12 19 10 110 (11) (80) 90 (9.0) (65) 35 (3.5) (25.5) M14 22 12 180 (18) (130) 140 (14) (101) 55 (5.5) (40) M16 24 14 270 (27) (195) 210 (21) (152) 80 (8.0) (58) M18 27 14 400 (40) (290) 300 (30) (215) 120 (12) (87) M20 30 17 550 (55) (400) 400 (40) (290) 170 (17) (123) M22 32 750 (75) (540) 550 (55) (400) 220 (22) (159) M24 36 950 (95) (690) 700 (70) (510) 280 (28) (205) M27 41 1400 (140) (1010) 1050 (105) (760) 400 (40) (290) M30 46 1950 (195) (1410) 1450 (145) (1050) 550 (55) (400) M33 50 2600 (260) (1880) 1950 (195) (1410) 750 (75) (540) M36 55 3200 (320) (2310) 2450 (245) (1770) 950 (95) (690)