Komatsu 70001 - Standard Tightening Torque Table

SEN02226-02 00 Index and foreword
32 PC400, 450-8
Standard tightening torque table 1
1. Table of tightening torques for bolts and nuts
a Unless there are special instructions, tighten metric nuts and bolts to the torque below.
a The following table applies to the bolts in Fig. A.
a The following table applies to the bolts in Fig. B.
a Fig. A a Fig. B
Remarks: The widths across flats against the thread diameters of flanged bolts (marks with "*") in Fig. A are
the ones indicated in the table for bolts shown in Fig. B.
(Values of tightening torques shown in the table for Fig. A are applied.)
Thread diameter of bolt Width across flats Tightening torque
mm mm Nm kgm
6 10 11.8 – 14.7 1.2 – 1.5
8 13 27 – 34 2.8 – 3.5
10 17 59 – 74 6.0 – 7.5
12 19 98 – 123 10.0 – 12.5
14 22 157 – 196 16 – 20
16 24 245 – 309 25 – 31.5
18 27 343 – 427 35 – 43.5
20 30 490 – 608 50 – 62
22 32 662 – 829 67.5 – 84.5
24 36 824 – 1,030 84 – 105
27 41 1,180 – 1,470 120 – 150
30 46 1,520 – 1,910 155 – 195
33 50 1,960 – 2,450 200 – 250
36 55 2,450 – 3,040 250 – 310
39 60 2,890 – 3,630 295 – 370
Thread diameter of bolt Width across flats Tightening torque
mm mm Nm kgm
6 10 5.9 – 9.8 0.6 – 1.0
8 12 13.7 – 23.5 1.4 – 2.4
10 14 34.3 – 46.1 3.5 – 4.7
12 17 74.5 – 90.2 7.6 – 9.2