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Installation, operation and maintenance instructions
High voltage flameproof motors for explosive atmosphere
AMD Rg 355-400-450-500
Recommended tightening torque for bolts on the motor
Issued by: MOLM
Sheet No
3AAM101050 E
Rev. B
Page 1 of 1
01.2023
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Recommended tightening torque for bolts on the motor
Recommended tightening torque for bolts slightly coated with oil.
NOTE: Do not use Molybdenum di-sulphide
Bolt size
M 8
M 10
M 12
M 16
Torque (Nm)
20
40
70
170
(lbf ft)
14.7
29.5
51.6
125.4
Bolt size
M 20
M 24
M 30
M 36
Torque (Nm)
330
580
1150
2000
(lbf ft)
243.4
427.8
848.2
1475.2
Table below is related to cast iron frame motors
Tightening Torque for screws with spindle nut in cast iron
Thread Size
Tightening Torque
Tightening Torque
Cast iron spindle nut material
[-]
[Nm]
(lbf ft)
M20
110/135/155
81.1/99.6/114
EN GJL-250/EN GJL-300/ EN GJL 350
M24
195/230
143.8/169.6
EN GJL-250/EN GJL-300
M27
290/380
213.9/280.3
EN GJL 350/EN GJS 450