TIGHTENING TORQUE SPECIFICATIONS 4.5 TIGHTENING TORQUE SPECIFICATIONS 4.5.1 TIGHTENING TORQUE LIST If nuts, bolts, or other parts are not tightened to the specified torque, it will cause looseness or damage to the tightened parts, and this will cause failure of the machine or problems with operation. Always pay careful attention when tightening parts. Unless otherwise specified, tighten the metric nuts and bolts to the torque shown in the table below. If it is necessary to replace any nut or bolt, always use a Ko- matsu genuine part of the same size as the part that was re- placed.
RYA02980 IMPORTANT This driving torque table is not valid for screws or nuts that must lock parts made of nylon or similar ma- terials on to washers or components made of nylon or nonferrous materials.
170 CAUTION Thread diameter of bolt (a)(mm) Width across flats (b)(mm) Tightening torque Target value Service limit Nm kgm Nm kgm 8 10 12 14 10 13 17 19 22 13.2 31 66 113 172 1.35 3.2 6.7 11.5 17.5 11.8-1 27-3 59-7 98-12 153-1 4.7 11.8-14.7 4 27-34 4 59-74 3 98-123 90 153-190 16 18 20 22 24 24 27 30 32 36 260 360 510 688 883 26.5 37 52.3 70.3 90 235-2 320-4 455-5 610-7 785-9 85 23.5-29.5 00 33.0-41.0 65 46.5-58.0 65 62.5-78.0 80 80.0-100.0 27 30 33 36 39 41 46 50 55 60 1295 1720 2210 2750 3280 132.5 175.0 225.0 280.0 335.0 1150-1 1520-1 1960-2 2450-3 2890-3 440 118.0-147.0 910 155.0-195.0 450 200.0-250.0 040 250.0-310.0 630 295.0-370.0