Operating Manual for BAUER LINESTAR 9000 with hose feed 55
18.4.1 PRELOAD FORCES AND TIGHTENING TORQUES OF BOLTS
The listed preload forces and torques concern
standard metric threads according to DIN 13
bolt head bearing faces according to DIN 912, 931, 934, 6912, 7984 and 7990
coarse inch threads (UNC)
fine inch threads (UNF)
and assume a bolt deformation limit of 90° and a friction factor of 0.14 (new bolt, no finishing, unlubricated).
Bolts with standard metric thread DIN 13
dimension quality torque preload force
Nm N
M 8 8.8 25.5 16230
M 10 8.8 50 25791
M 12 8.8 87.3 37657
M 14 8.8 138.3 51681
M 16 8.8 210.8 71196
M 20 8.8 411.9 111305
M 24 8.8 711 160338
Bolts with standard UNC thread
dimension quality torque preload force
Nm N
1/4" S 12.5 10080
5/16" S 21.3 13954
1/2" S 92.7 38463
Bolts with standard UNF thread
dimension quality torque preload force
Nm N
9/16" S 150 57143
When mounting the wheel gears never use an impact wrench for tightening the 1/2" UNC bolts.
You risk damaging the thread inside the gearbox.
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