Tightening Torques - BMW K75 Repair Manual

Tightening torques
BMW N 600 02.0
Valid only for bolts and screws to German DIN 912, 931, 933, 960, 961 and 6912 standard and nuts with a height of 0.8
x dto DIN 934 standard, sOlelyfortotal1l
=
0.14
(Boltor screw phosphatised, nut galvanized or untreated. Either oiled or dry.)
For cadmium-plated bolts or nuts (total I'
==
0.08 to 0.09) the tightening torque for the same strength limit utilisation
of the bolt material must be
30% lower
than stated in the table.
Not valid if the thread has any other surface treatment or lubrication, or for different nut heights. In such cases the
values must be specially calculated .
Not valid for screws or bolts of the expansion type, for self-locking threaded connections or when components made
from different materials are used to form the threaded joint.
The strength utilisation factor for balls with standard metric thread is:
~E>d -o,üg:-o?2]
Tightening torque M
A
(Nm)
Tighteningtorque, max. (Nm)
Threaded connection class 111
M
sp
=
MAmax.
M A
=
0,89 x Msp
±
12%
Strength classification ace. to DIN 267 Strength classification ace. to DIN 267
Thread 5.6
6.8 6.9 8.8 10.9 12.9 5.6 6.8 6 .9 8.8 10.9 12.9
M6 4 .7 7.5 8.4 9.9 14.0 16.5
4 .2± 0.5 6,7± 0,8 7.5± 0.9
8.8± 1.1 12.5± 1.5 14.7± 1.8
M8 11.0 18.0 20.0 24.0 34.0 40.0
9.8± 1.2
16.0± 19 17.8± 2.1
21.4± 2.6
30.3± 3.6 35.6± 4.3
M10 23.0 36.0 40.0 47.0 66.0 79.0
20.5± 2.5 32.0± 3.8 35 .6± 4.3 41.8± 5.0 58.7± 7.1 70.3± 8.4
M8 x 1
12.0 19.5 22.0 25.0 36.0 44.0
10.7± 1.3
17.4± 2.1
19.6± 2.4 23.1 ± 2.8 32.0± 3.8 39.2± 4.7
M10 x 1 25.0
40.0 45.0
54.0 75.0 91.0
22.3± 2.7
35.6± 4.3
40.1 ± 4.8 48.1 ± 5.8 66.8± 8.0 81.0± 9.7
M12 x 1.5 41.0 55.5 73.5 87.0 123.0 147.0
36.5± 4.4 49.4± 5.9 65.4± 7.9
77.4± 9.3
109.5±13.1 130.8±15.7
M14x1.5 67.0 107.0 120.0 143.0 200 .0 240.0
50.7± 6.!
95.2±11.4 106.7±12.8 127.3±15.3 178.0±21.4 213.6±256
M16 x1 .5 101.0 162.0 182.0 216.0 303.0 364.0
89.9±10.8 144.2±17.3 162.0±19.4 192.2±23.1 269.7±32.4 324.0±38.9
M18x1.5 147.0 234.0 264.0 313.0 440.0 527.0
130.8±15.7 208.3±25.0 235.0±282 278.6±33.4 391 .6±47.0 469.0±56.3
M20x1 .5 204.0 326.0 367.0 435.0
612.0 734.0 181.6±21.8 290.1±34.8 326.6±39.2 387.2±46.5 544.7±65.4 653.3±78.4
The values stated in the above tables apply to threaded connections in accordance with the above conditions. The
tightening torque including tolerance is only indicated on the general arrangement or assembly drawing if:
a) a value wh ich differs from the Standard is needed for functional reasons,
b) the strength classification of the bolt and nut is not evident.
Important note: All deviations from this table are individually stated in the Specifications.
8.87
00 - 05.0