Chapter 4 Preparations for Installation
12
(Unit: mm)
Fig. 4-3
4.2.4. Serrated lock washer for hexagon socket head cap screw
Prepare the following Serrated lock washer for a hexagon socket head cap screw recommended by Nabtesco.
Name:
Belleville spring washer (made by Heiwa Hatsujyo Industry Co., Ltd.)
Corporation
symbol:
CDW-H, CDW-L (Only for M5)
Material:
S50C to S70C
Hardness:
HRC40 to 48
Table 4-4
When using any equivalent washer, select it with special care given to its outside diameter (D).
Nominal
size
ID and OD of Belleville
spring washer
t
H
ød
øD
5
5.25
8.5
0.6
0.85
6
6.4
10
1.0
1.25
8
8.4
13
1.2
1.55
10
10.6
16
1.5
1.9
12
12.6
18
1.8
2.2
14
14.6
21
2.0
2.5
16
16.9
24
2.3
2.8
18
18.9
27
2.6
3.15
20
20.9
30
2.8
3.55
Assemble the bolt so that the
bolt head faces this side
Important
