Appendix c general torque specifications – Alpha Technologies AlphaGen 3.5_5.0kW Kohler COM5 User Manual
Page 74
TP-6482 8/06
74
Appendix
Appendix C General Torque Specifications
American Standard Fasteners Torque Specifications
Torq e
Assembled into Cast Iron or Steel
Assembled into
Aluminum
Size
Torque
Measurement
Grade 2
Grade 5
Grade 8
Aluminum
Grade 2 or 5
8-32
Nm (in. lb.)
1.8
(16)
2.3
(20)
—
10-24
Nm (in. lb.)
2.9
(26)
3.6
(32)
—
10-32
Nm (in. lb.)
2.9
(26)
3.6
(32)
—
1/4-20
Nm (in. lb.)
6.8
(60)
10.8
(96)
14.9
(132)
1/4-28
Nm (in. lb.)
8.1
(72)
12.2
(108)
16.3
(144)
5/16-18
Nm (in. lb.)
13.6
(120)
21.7
(192)
29.8
(264)
5/16-24
Nm (in. lb.)
14.9
(132)
23.1
(204)
32.5
(288)
3/8-16
Nm (ft. lb.)
24.0
(18)
38.0
(28)
53.0
(39)
3/8-24
Nm (ft. lb.)
27.0
(20)
42.0
(31)
60.0
(44)
7/16-14
Nm (ft. lb.)
39.0
(29)
60.0
(44)
85.0
(63)
7/16-20
Nm (ft. lb.)
43.0
(32)
68.0
(50)
95.0
(70)
See Note 3
1/2-13
Nm (ft. lb.)
60.0
(44)
92.0
(68)
130.0
(96)
1/2-20
Nm (ft. lb.)
66.0
(49)
103.0
(76)
146.0
(108)
9/16-12
Nm (ft. lb.)
81.0
(60)
133.0
(98)
187.0
(138)
9/16-18
Nm (ft. lb.)
91.0
(67)
148.0
(109)
209.0
(154)
5/8-11
Nm (ft. lb.)
113.0
(83)
183.0
(135)
259.0
(191)
5/8-18
Nm (ft. lb.)
128.0
(94)
208.0
(153)
293.0
(216)
3/4-10
Nm (ft. lb.)
199.0
(147)
325.0
(240)
458.0
(338)
3/4-16
Nm (ft. lb.)
222.0
(164)
363.0
(268)
513.0
(378)
1-8
Nm (ft. lb.)
259.0
(191)
721.0
(532)
1109.0
(818)
1-12
Nm (ft. lb.)
283.0
(209)
789.0
(582)
1214.0
(895)
Metric Fasteners Torque Specifications, Measured in Nm (ft. lb.)
Assembled into Cast Iron or Steel
Assembled into
Aluminum
Size (mm)
Grade 5.8
Grade 8.8
Grade 10.9
Aluminum
Grade 5.8 or 8.8
M6
x 1.00
6.2
(4.6)
9.5
(7)
13.6
(10)
M8
x 1.25
15.0
(11)
23.0
(17)
33.0
(24)
M8
x 1.00
16.0
(11)
24.0
(18)
34.0
(25)
M10 x 1.50
30.0
(22)
45.0
(34)
65.0
(48)
M10 x 1.25
31.0
(23)
47.0
(35)
68.0
(50)
M12 x 1.75
53.0
(39)
80.0
(59)
115.0
(85)
M12 x 1.50
56.0
(41)
85.0
(63)
122.0
(90)
See Note 3
M14 x 2.00
83.0
(61)
126.0
(93)
180.0
(133)
M14 x 1.50
87.0
(64)
133.0
(98)
190.0
(140)
M16 x 2.00
127.0
(94)
194.0
(143)
278.0
(205)
M16 x 1.50
132.0
(97)
201.0
(148)
287.0
(212)
M18 x 2.50
179.0
(132)
273.0
(201)
390.0
(288)
M18 x 1.50
189.0
(140)
289.0
(213)
413.0
(305)
Notes:
1.
The torque values above are general guidelines. Always use the torque values specified in the service manuals and/or assembly drawings
when they differ from the above torque values.
2.
The torque values above are based on new plated threads. Increase torque values by 15% if non-plated threads are used.
3.
Hardware threaded into aluminum must have either two diameters of thread engagement or a 30% or more reduction in the torque to
prevent stripped threads.
4.
Torque values are calculated as equivalent stress loading on American hardware with an approximate preload of 90% of the yield strength
and a friction coefficient of 0.125.