ARMY TM 9-6115-670-14&P
I-2
I-2.2. Torque Values for General Use Screws, Bolts, and Nuts. When torque values are not
provided for a specific fastener or application, tighten the screw, bolt, or nut according to the values in
Table I-2. General and special use material grades are shown by numbers punched on screw and bolt
heads. Prior to tightening, verify the fastener material using the numbers shown in Table I-2.
Table I-2. Torque Values for General Use Screws, Bolts, and Nuts
Grade
Standard Screw and Bolt
(Identify by plain head or punched
number 4 on head. Material
grade SS41 or S20C.)
Special Screw and Bolt
(Identify by punched number 7
on head. Material grade S43C
or S48C (Refined).)
Nominal
Diameter
Nm
Ft-Lbs
Nm
Ft-lbs
M6
7.9 to 9.3
5.8 to 6.9
9.8 to 11.3
7.23 to 8.32
M8
17.7 to 20.6
13.0 to 15.2
23.5 to 27.5
17.4 to 20.3
M10
39.2 to 45.1
28.9 to 33.3
48.1 to 55.9
35.4 to 41.2
M12
62.8 to 72.6
46.3 to 53.5
77.5 to 90.2
57.1 to 66.5
I-3.
TIGHTENING METAL FASTENERS.
When torquing a fastener, select a wrench with a range which fits the required torque value. A torque
wrench is most accurate from 25 percent to 75 percent of its stated range. A wrench with a stated range
of 0 to 100 ft-lbs will be most accurate from 25 to 75 ft-lbs. The accuracy of readings will decrease as
you approach 0 ft-lbs or 100 ft-lbs. The ranges in Table I-3 are based on this principle.
Table I-3. Torque Ranges - Typical
Stated Range
Most Effective Range
0 - 200 in.-lbs
0 - 225.8 Nm
50 - 150 in.-lbs
56.4 - 169.3
0 - 600 ft-lbs
0 - 813.6 Nm
150 - 450 ft-lbs
203.4 - 610.2 Nm
0 - 170 ft-lbs
0 - 230.5 Nm
43 - 127 ft-lbs
58.3 - 172.2 Nm
