Komatsu 830E-AC, Shop Manual

Page: 64 / 1085

A5-2 Standard Torque Charts and Conversion Tables 11/05 A05001
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.
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.
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.
TABLE II. STANDARD ASSEMBLY TORQUE
for 12-Point, Grade 9 Cap screws
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
values to replace torque values which are specified in assembly
instructions.
TABLE III. STANDARD ASSEMBLY TORQUE
for Metric Class 10.9 Cap screws & Class 10 Nuts
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
values to replace torque values which are specified in assembly
instructions.