6.22
Maintenance
6.5.2 Torque values
The tightening torque values for bolts and screws used in ELGi Compressors are provided in this section for reference. The
tolerance for the torque values is (-) 10% from the given value.
* Property class of 8.8 only
Thread size (inches) Tightening torque (N-m) Tightening torque (lb-ft)
9/16" 149 109.8875
7/8" 579 427.0125
Table 11: UNF threads
Thread size (inches) Tightening torque (N-m) Tightening torque (lb-ft)
¼" 45 33.19
½" 85 62.69
¾" 170 125.38
1" 330 243.39
1¼" 430 317.15
1½" 510 376.15
Table 10: BSP threads
Thread size* Tightening torque (N-m) Tightening torque (lb-ft)
M4 2.9 2.13
M5 5.7 4.20
M6 9.8 7.22
M8 24 17.7
M10 47 34.66
M12 81 59.73
M16 197 145.28
M20 385 283.93
Table 9: Metric hexagonal head bolts and screws
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