Chapter 4
Preparations for installation
11
4.2.2. Reduction gear mounting bolts
• Prepare bolts according to the size and quantity of the case installation bolts and shaft installation
bolts indicated in the separately provided “Outer dimensions” drawings and specification sheet.
• Select the appropriate bolt length based on the mounting dimensions of the components prepared by
the customer and the reduction gear.
• Prepare the following bolts recommended by Nabtesco:
Hexagon socket
head cap screw
JIS B 1176: 2006
Strength class
JIS B 1051: 2000 12.9
Thread
JIS B 0209: 2001 6 g
4.2.3. 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:
HR40 to 48
Table 4-1
(Unit: mm)
Nominal
size
ID and OD of Belleville
spring washer
t
H
ø d
ø D
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
When using any equivalent washer, select it with special care given to its outside diameter (øD).
Important
Fig. 4-2
Assemble the bolt so that the
bolt head faces this side
