13.2 Torque value
Tightening torque and assembly pre-load for bolts with metric thread and standard or fine pitch
The values listed apply to dry or slightly lubricated connections.
Do not use galvanized (plated) bolts and nuts without grease.
When using a stif
f grease, reduce the value in the table with 10%.
When using (self-)locking bolts and nuts increase the value in the table with 10%.
Tightening torque and assembly pre-load with v=0,9 for shank bolts with metric thread and standard or
fine pitch according to ISO 262 and ISO 965-2
Steel class quality fasteners according to ISO 898-1
Head dimensions of hexagonal bolts according to ISO 4014 to ISO 4018
Head dimensions of cylindrical bolts according to ISO 4762
Hole "medium" according to EN 20273
Friction coef
ficient: 0,12≤ µ ≤0,18
Metric thread with standard pitch
Thread Class
Tightening torque Max. assembly
pre-load
(µ
min
=0.12)
N
Nm lbf-ft (lbf-in)
M4
(X0.7)
8.8 3 (26.5) 4400
10.9 4.9 (40.7) 6500
12.9 5.1 (45.1) 7600
M5
(X0.8)
8.8 5.9 (52.2) 7200
10.9 8.6 (76.1) 10600
12.9 10 (88.5) 12400
M6
(X1)
8.8 10.1 7.4 10200
10.9 14.9 11 14900
12.9 17.4 12.8 17500
M8
(X1.25)
8.8 24.6 18.1 18600
10.9 36.1 26.6 27300
12.9 42.2 31.1 32000
13. Appendix
AERO GT 60.1 5903494
141
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