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Calculation according to DIN946 (Rotzler formula) when using NORD-LOCK washers Bolt size
A
Thread pitch [mm] B
Mean diam. of thread [mm]
Load area [mm2]
0.0
0.00
M
Thread friction
µT C
OD of contact area [mm] D
ID o f contact area [mm] E
Mean diam. of contact area
Washer friction
µW F
Yield point of bolt [Mpa] G
0.00
= specify parameters A B C D E F G H
Specify bolt size (Metric only) Specify tread pitch Specify thread friction (if possible please use chart 1 below) OD of contactact area = outer diameter of contact area between NL washer and nut/bolt head ID of contactact area = inner diameter of contact area between NL washer and nut/bolt head Specify washer friction (if possible use chart 1 below) Specify yield point of bolt (if possible use chart 2 below) Specify ratio of the bolt's yield point (%)
Chart 1: Thread friction µT and Washer friction µW (according to DIN946) Bolt grade
Non Lubricated Thread Washer
With oil spray Thread Washer
With MoS2 Thread Washer
8.8
0.15
0.17
0.12
0.14
0.11
0.12
10.9
-
-
0.14
0.11
0.14
0.10
12.9
-
-
0.14
0.11
0.15
0.10
A4
-
-
-
-
0.14
0.15
5.6 300
Steel 5.8 400
Chart 2: Yield points for most common bolt grades Bolt grade Yield point [Mpa]
