Product Manual

6.17
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 6: 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 5: 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 4: Metric hexagonal head bolts and screws