8-S6
BX24, RCK54(P)-23BX, RCK60B-23BX, LA240, BT601, WSM
FRONT LOADER
4. TIGHTENING TORQUES
[1] GENERAL USE SCREWS, BOLTS AND NUTS
Screws, bolts and nuts whose tightening torques are not specified in this Workshop Manual should be tightened
according to the table below.
W1012507
[2] HYDRAULIC FITTINGS
• When connecting a hose with flare nut, after tightening the nut with specified torque, return it
approximately 45 degrees and re-tighten it to specified torque.
W1013389
[3] TIGHTENING TORQUES OF SCREWS, BOLTS AND NUTS ON THE
TABLE BELOW ARE ESPECIALLY SPECIFIED
W1012736
American standard cap screws with UNC or UNF Threads Metric cap screws
Grade SAE 5 or 8 Grade
Property class 8.8
(Approx. SAE grade 5)
Unit
Size
N·m kgf·m ft-lbs
Unit
Size
N·m kgf·m ft-lbs
1/4 9.8 to 11.7 1.0 to 1.2 7.2 to 8.6 M6 9.8 to 11.2 1.0 to 1.1 7.2 to 8.3
5/16 19.0 to 23.1 1.9 to 2.4 14 to 17 M8 23.6 to 27.4 2.4 to 2.8 17.4 to 20.2
3/8 33.9 to 40.7 3.5 to 4.2 25 to 30 M10 48.1 to 55.8 4.9 to 5.7 35.5 to 41.2
1/2 88.1 to 105.8 9.0 to 10.8 65 to 78 M12 77.5 to 90.1 7.9 to 9.2 57.2 to 66.5
9/16 122.0 to 146.4 12.4 to 14.9 90 to 108 M14 124 to 147 12.6 to 15.0 91.2 to 108
5/8 176.3 to 211.5 18.0 to 21.6 130 to 156 M16 196 to 225 20.0 to 23.0 145 to 166
– –––M18 275 to 318 28.0 to 32.5 203 to 235
Item Thread size
Tightening torque
N·m kgf·m ft-lbs
Adjustable elbow
and adapter
9/16 37 to 44 3.7 to 4.6 27 to 33
3/4 47 to 54 4.8 to 5.5 35 to 40
Hose fitting and
flare nut
9/16 22 to 25 2.2 to 2.6 16 to 19
3/4 35 to 41 3.6 to 4.1 26 to 30
7/8 65 to 71 6.6 to 7.2 48 to 52
1/4 30 to 35 3.1 to 3.6 22 to 26
Adapter (NPT)
3/8 39 to 44 3.9 to 4.4 28 to 32
1/2 49 to 58 5.0 to 5.9 36 to 43
Item N·m kgf·m ft-lbs
Boom cylinder piston mounting nut 150 to 180 15.3 to 18.3 111 to 132
Bucket cylinder piston mounting nut 350 to 400 35.7 to 40.7 259 to 295
Main frame mounting bolt and nut (M14) 147 15.0 108
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