2.4.2 Tightening torque
2.4.2.1 Tightening torques for screws
Overview:
■ Standard values for M4–M8 screws
─ Surface finish: zinc plated (bright)
■ Standard values for M10–M24 screws
─ Surface finish: zinc flake coating (matte).
➤ Set the torque as appropriate for the surface finish and friction coefficient.
Standard values for M4–M8 screws with steel grade 8.8:
Thread
M4
M5
M6
M8
Torque [lbf-in]
26.6
52.2
88.5
216.8
Surface finish: zinc plated (bright)
Standards based on VDI 2230.
Tab. 18 Torques for M4–M8 screws
Standard values for M10–M24 screws with steel grade 8.8:
Thread
M10
M12
M14
M16
M20
M24
Torque [lbf-in]
354.0
620.0
929.3
1460
2832.2
4867.9
Surface finish: zinc flake coating (matte).
Standards based on VDI 2230.
Tab. 19 Torques for M10–M24 screws
2.4.2.2 Tightening torques for lifting eye
Recommended values for screws by strength class:
Screws
Strength class
Thread
Torque [lbf in]
Hex-head bolt
8.8
M12
266
Hex-head bolt
8.8
M16
1770
Tab. 20 Torques for lifting eye screws
2.4.2.3 Torque cover fixing screws oil separator tank
Recommended values for screws corresponding to the strength category:
Screws
Strength category
Thread
Torque [lbf in]
Hex-head screw
8.8
M16
1770
Tab. 21 Torque cover fixing screws oil separator tank
2
Technical Data
2.4
Machine (without options)
8
Operator Manual Portable Rotary Screw Compressor
MOBILAIR M82 SIGMA CONTROL SMART
No.: 901783 08 USE