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Technical Informations - NBK - #29

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Plain Washers Excerpts from JIS B 1256:1998
Jormal and Extra Large Series - Forms and Dimensions of Part Grade C
Normal and extra large series - Forms of part grade C
///
///
d
1
d2
Normal series - Dimensions of part grade C
Nominal dia *i
Inside dia di
Outside dia d2
Thickness h
Basic dimensions (Min)
Max
Basic dimensions (Max)
Min
Basic dimensions
Max
Min
5.5
5.8
10
9.1
1
1.2
0.8
6
6.6
6.96
12
10.9
1.6
1.9
1.3
CO
9
9.36
16
14.9
1.6
1.9
1.3
10
11
11.43
20
18.7
2
2.3
1.7
12
13.5
13.93
24
22.7
2.5
2.8
2.2
14
15.5
15.93
28
26.7
2.5
2.8
2.2
16
17.5
17.93
30
28.7
3
3.6
2.4
20
22
22.52
37
35.4
3
3.6
2.4
24
26
26.52
44
42.4
4
4.6
3.4
30
33
33.62
56
54.1
4
4.6
3.4
36
39
40
66
64.1
5
6
4
* 1 The nominal diameter here is the same as that of a thread to be assembled with the washer. Extra large series - Dimensions of part grade C
unit: mm
Nominal dia *i
Inside dia di
Outside dia d2
Thickness h
Basic dimensions (Min)
Max
Basic dimensions (Max)
Min
Basic dimensions
Max
Min
5
5.5
5.8
18
16.9
2
2.3
1.7
CD
6.6
6.96
22
20.7
2
2.3
1.7
CO
9
9.36
28
26.7
3
3.6
2.4
10
11
11.43
34
32.4
3
3.6
2.4
12
13.5
13.93
44
42.4
4
4.6
3.4
14
15.5
15.93
50
48.4
4
4.6
3.4
16
17.5
18.2
56
54.1
5
CO
4
20
22
22.84
72
70.1
6
7
U1
24
26
26.84
85
82.8
6
7
Ol
30
33
34
105
102.8
6
7
Ol
36
39
40
125
122.5
CO
9.2
6.8
* 1 The nominal diameter here is the same as that of a thread to be assembled with the washer.
Normal and extra large series - Specifications of part grade C
Material classes
Steel
Mechanical properties
Hardness classes
100HV
Hardness HV
100 or more
Tolerance
Compliant with part grade C specified by JIS B 1022.
Surface condition
Generally, no surface treatment is carried out. If plating and other surface treatments are required, the customer should specify so.
If electroplating is used, it should be compliant with JIS B 1044.
208
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