Komatsu 930E-4, Operation & Maintenance Manual

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STANDARD CHARTS AND TABLES
STANDARD TIGHTENING TORQUES
SAE Grade 9 Capscrews
The following specifications apply to required
assembly torques for SAE Hex Head and 12-point,
grade 9 (170,000 psi minimum tensile), capscrews.
NOTE: Capscrew threads and seats shall be
lubricated when assembled. Unless instructions
specifically recommend otherwise, these standard
torque values are to be used with simple lithium base
chassis grease (multi-purpose EP NLGI) or a rust-
preventive grease (see list, this page) on the threads.
NOTE: Torques are calculated to give a clamping
force of approximately 75% of proof load. The
maximum torque tolerance shall be within ±10% of
the torque value shown.
Table 2-3
Standard Tightening Torque for SAE Hex
Head and 12-Point, Grade 9 Capscrews
Capscrew
Size
1
Torque
N·m
Torque
ft·lb
Torque
kg·m
0.250 - 20 16 12 1.7
0.312 - 18 33 24 3.3
0.375 - 16 57 42 5.8
0.438 -14 95 70 9.7
0.500 -13 142 105 14.5
0.562 - 12 203 150 20.7
0.625 - 11 278 205 28.3
0.750 - 10 488 360 49.7
0.875 - 9 780 575 79.4
1.000 - 8 1166 860 119
1.000 - 12 1240 915 126
1.125 - 7 1670 1230 170
Standard Tightening Torque for SAE Hex
Head and 12-Point, Grade 9 Capscrews
Capscrew
Size
1
Torque
N·m
Torque
ft·lb
Torque
kg·m
1.125 - 12 1800 1330 184
1.250 - 7 2325 1715 237
1.250 - 12 2495 1840 254
1.375 - 6 3080 2270 313
1.375 - 12 3355 2475 342
1.500 - 6 4040 2980 411
1.500 - 12 4375 3225 445
T-Bolt Clamps
Table 2-4
Tightening Torque For T-Bolt Type Hose
Clamp (SAE J1508 Type TB)
Thread
Size
Band
Width
Newton
meters
(N · m)
Inch
Pounds
(in · lb)
0.25-28
UNF
19.05 mm
(0.75 in.)
8.5 ± 0.6 75 ± 5
1. Shank Diameter (in) — Threads per inch
930E-4 2-5