Komatsu 830E-AC Shop Manual page 64

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 lubricated
when assembled.
NOTE: Unless the 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.
• 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.
TABLE II. STANDARD ASSEMBLY TORQUE
for 12-Point, Grade 9 Cap screws
CAPSCREW TORQUE
SIZE* ft lbs
0.250 - 20 12
0.312 - 18 24
0.375 - 16 42
0.438 -14 70
0.500 -13 105
0.562 - 12 150
0.625 - 11 205
0.750 - 10 360
0.875 - 9 575
1.000 - 8 860
1.000 - 12 915
1.125 - 7 1230
1.125 - 12 1330
1.250 - 7 1715
1.250 - 12 1840
1.375 - 6 2270
1.375 - 12 2475
1.500 - 6 2980
1.500 - 12 3225
* Shank Diameter (in.) - Threads per inch
This table represents standard values only. Do not use these
values to replace torque values which are specified in assembly
instructions.
A5-2
TORQUE TORQUE
N•m kg•m
16 1.7
33 3.3
57 5.8
95 9.7
142 14.5
203 20.7
278 28.3
488 49.7
780 79.4
1166 119
1240 126
1670 170
1800 184
2325 237
2495 254
3080 313
3355 342
4040 411
4375 445
Standard Torque Charts and Conversion Tables
STANDARD ASSEMBLY TORQUES
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 simple lithium base chassis
grease (multi-purpose EP NLGI) or a rust preventive
grease (see list, this page) to achieve the same
clamping 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.
TABLE III. STANDARD ASSEMBLY TORQUE
for Metric Class 10.9 Cap screws & Class 10 Nuts
CAPSCREW TORQUE
SIZE* N•m
M6 x1 12
M8 x 1.25 30
M10 x 1.5 55
M12 x 1.75 95
M14 x 2 155
M16 x 2 240
M20 x 2.25 465
M24 x 3 800
M30 x 3.5 1600
M36 x 4 2750
* Shank Diameter (mm) - Threads per millimeter
This table represents standard values only. Do not use these
values to replace torque values which are specified in assembly
instructions.
Suggested* Sources for Rust Preventive Grease:
• American Anti-Rust Grease #3-X from Standard 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 Co.
• Rust Preventive Grease - Code 312 from the
Southwest Grease and Oil Company.
NOTE: This list represents the current engineering
approved sources for use in Komatsu manufacture. It is
not exclusive. Other products may meet the same
specifications of this list.
TORQUE TORQUE
ft lbs kg•m
9 1.22
22 3.06
40 5.61
70 9.69
114 15.81
177 24.48
343 47.43
590 81.6
1180 163.2
2028 280.5
11/05 A05001