Komatsu 830E, Shop Manual

Page: 56 / 783

A5-2 12/01 A05006
Standard Assembly Torques For 12-Point, Grade 9,
Capscrews (SAE)
The following specifications apply to required assembly
torques for all 12-Point, Grade 9 (170,000 psi minimum
tensile), Capscrews.
•
Capscrew threads and seats SHALL be lubri-
cated when assembled.
Unless instructions specifically recommend other-
wise, these standard torque values are to be used
with simple lithium base chassis grease (multi-pur-
pose EP NLGI) or a rust-preventive grease (see list,
this page) on the threads.
•
Torques are calculated to give a clamping force
of approximately 75% of proof load.
• The maximum torque tolerance shall be ±10% of
the torque value shown.
Standard Metric Assembly Torque For Class 10.9
Capscrews & Class 10 Nuts
The following specifications apply to required assembly
torques for all metric Class 10.9 finished hexagon head
capscrews and Class 10 nuts.
•
Capscrew threads and seats SHALL NOT be
lubricated when assembled. These specifications
are based on all capscrews, nuts, and hardened
washers being phosphate and oil coated.NOTE:
If zinc-plated hardware is used, each piece must
be lubricated with a Rust Preventive Grease or
Lithium-base grease to achieve the same clamp-
ing forces provided below.
•
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.
Suggested* Sources for Rust Preventive Grease:
•
AMERICAN ANTI-RUST GREASE #3-X from Stan-
dard Oil Company (also American Oil Co.)
•
GULF NORUST #3 from Gulf Oil Company.
•
MOBILARMA 355, Product No. 66705 from Mobil
Oil Corporation.
•
RUST BAN 326 from Humble Oil Company.
•
RUSTOLENE B GREASE from Sinclair Oil Com-
pany.
•
RUST PREVENTIVE GREASE - CODE 312 from
the Southwest Grease and Oil Company.
* NOTE: This list represents the current Engineer-
ing approved sources for use in Komatsu manufac-
ture. It is not exclusive. Other products may meet
the same specifications of this list.
TABLE II. - STANDARD ASSEMBLY TORQUE
for 12-Point, Grade 9 Capscrews
CAPSCREW
SIZE*
TORQUE
ft. lbs.
TORQUE
N.m
TORQUE
kg.m
0.250 - 20 12 16 1.7
0.312 - 18 24 33 3.3
0.375 - 16 42 57 5.8
0.438 -14 70 95 9.7
0.500 -13 105 142 14.5
0.562 - 12 150 203 20.7
0.625 - 11 205 278 28.3
0.750 - 10 360 488 49.7
0.875 - 9 575 780 79.4
1.000 - 8 860 1166 119
1.000 - 12 915 1240 126
1.125 - 7 1230 1670 170
1.125 - 12 1330 1800 184
1.250 - 7 1715 2325 237
1.250 - 12 1840 2495 254
1.375 - 6 2270 3080 313
1.375 - 12 2475 3355 342
1.500 - 6 2980 4040 411
1.500 - 12 3225 4375 445
* Shank Diameter (in.) - Threads per inch
This table represents standard values only. Do not use these val-
ues to replace torque values which are specified in assembly
instructions.
TABLE III. - STANDARD METRIC ASSEMBLY TORQUE
CAPSCREW
SIZE*
TORQUE
N.m
TORQUE
ft.lbs.
TORQUE
kg.m
M6 x1 12 9 1.22
M8 x 1.25 30 22 3.06
M10 x 1.5 55 40 5.61
M12 x 1.75 95 70 9.69
M14 x 2 155 114 15.81
M16 x 2 240 177 24.48
M20 x 2.25 465 343 47.43
M24 x 3 800 590 81.6
M30 x 3.5 1600 1180 163.2
M36 x 4 2750 2028 280.5
* Shank Diameter (mm) - Threads per millimeter
This table represents standard values only. Do not use these val-
ues to replace torque values which are specified in assembly
instructions.