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Torque Tables And Conversion Charts - Section 12
Page 12-2
EFFECT OF SPECIAL LUBRICANTS
On Fasteners and Standard Torque Values
The Komatsu engineering department does not
recommend the use of special friction-reducing
lubricants, such as Copper Coat, Never-Seez®, and
other similar products, on the threads of standard
fasteners where standard torque values are applied.
The use of special friction-reducing lubricants will
significantly alter the clamping force being applied to
fasteners during the tightening process.
If special friction-reducing lubricants are used with
the standard torque values listed in this chapter,
excessive stress and possible breakage of the
fasteners may result.
Where
the
torque
tables
Threads" for the standard torque values listed, these
standard torque values are to be used with simple
lithium base chassis grease (multi-purpose EP NLGI)
or a rust-preventive grease (see below) on the
threads and seats unless specified otherwise.
NOTE: Ensure the threads of fasteners and tapped
holes are free of burrs and other imperfections before
assembling.
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.
specify
"Lubricated
STANDARD TIGHTENING TORQUES
For Class 10.9 Cap screws & Class 10 Nuts
The following specifications apply to required
assembly torques for all metric class 10.9 finished
hexagon head cap screws and class 10 nuts.
• Cap screw threads and seats shall not be
lubricated when assembled. These specifications
are based on all cap screws, nuts, and hardened
washers being phosphate and oil coated.
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.
• In the following table under "Cap Screw Size", the
first number represents the shank diameter
(mm). The second number represents threads
per millimeter.
Example: M20 x 2.25
M20 = shank diameter (20 mm)
2.25 = thread pitch in millimeters
TABLE 1.
Standard Tightening Torque
for Metric Class 10.9 Cap screws & Class 10 Nuts
Cap Screw
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
02/11 OM1200
Torque
Torque
ft lb
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
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