FENDT Vario 900 Series, Workshop Service Manual, Page: 42 / 51

1.3 Tightening requirements
1.3.1 Spanner sizes for globally standard parts
Size
Hex bolt Double hex bolt Torx socket
M4
7 - T20
M5
8 - T25
M6
10 - T30
M8
+13 8 T45
M10
16 10 T50
M12
18 13 T55
M14
21 14 T60
M16
24 16 T70
M18
27 18 T80
M20
30 21 T90
M22
34 22 -
M24
36 24 -
M27
41 - -
M30
46 - -
1.3.2 Tightening torque for screws with a galvanized surface
Choose the correct friction coefficient
To ensure that the tightening torque and preload value can be accurately determined, it is essential to
know the
friction coefficient (µ
total
)
. Varying surface properties and lubrication conditions give rise to a
wide range of friction coefficients. If not otherwise specified, tightening torques can be calculated based
on their friction coefficient using the table below.
NOTE:
Locking screws with retaining ridges on the screw head contact surface have a greater friction coefficient.
[V]
GUID-69B8EE02-895F-4624-B489-936E2A2C1563 [V1]
GUID-4E08F746-8690-4BAE-B106-AFB4E98FE044 [V3]
1. 00-000 Entire vehicle system
1-28 FENDT 900 Vario S4
X990.005.531.013