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JIS B1220-2010
Regular circular washers for structures
Nom
d max
d min
dc max
dc min
h max
h min
Φ16
18.8
18
32
31
5
4
Φ20
22.8
22
40
39
5
4
Φ22
24.8
24
44
43
6.7
5.3
Φ24
26.8
26
48
47
6.7
5.3
Φ27
30.8
30
56
55
6.7
5.3
Φ30
34
33
60
58.8
8.7
7.3
Φ33
37
36
63
61.8
8.7
7.3
Φ36
40
39
66
64.8
8.7
7.3
Φ39
43
42
72
70.8
8.7
7.3
Φ42
46
45
78
76.8
8.7
7.3
Φ45
49
48
85
83.6
8.7
7.3
Φ48
53.2
52
92
90.6
8.7
7.3
Φ52
57.2
56
98
96.6
8.7
7.3
Φ56
63
60
105
102
10
8
Φ60
67
64
110
107
10
8
Φ64
71
68
115
112
10
8
Φ68
75
72
120
117
13.4
10.6
Φ72
79
76
125
122
13.4
10.6
Φ76
83
80
135
132
13.4
10.6
Φ80
87
84
140
137
13.4
10.6
Φ85
92
89
145
142
13.4
10.6
Φ90
97
94
160
157
13.4
10.6
Φ95
102
99
165
162
13.4
10.6
Φ100
107
104
175
172
17.4
14.6
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