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O-ring technical data

O-ring groove dimension for Vacuum flange

The O-ring groove dimensions for vacuum flanges are specified in JIS B 2290 standard 

CS
groove depth(A)
groove width(B)
4±0.10
3±0.1
5 +0.1/0
6±0.15
4.5±0.1
8 +0.1/0
10±0.30
7±0.1
12 +0.1/0

Dovetail O-ring groove

The main purpose is to prevent O-ring from falling off when the O-ring is installed, such as a valve, and sealing

■ for vacuum

unit : mm
O-ring
G±0.05
G
+0
 -0.05
R1
R MAX
PDF
CAD
standard
size
CS
before
chamfering
after
chamfering
JIS B 2401
P22A~P50
3.5±0.10
3.05
3.27
2.5
0.20
0.80
P48A~P150
5.7± 0.13
4.95
5.38
4.2
0.40
0.80
P150A~P400
8.4± 0.15
7.35
7.89
6.3
0.50
1.60
V15~V175
4± 0.10
3.45
3.77
2.9
0.30
0.80
V225~V430
6± 0.15
5.25
5.68
4.4
0.40
0.80
V480~V1055
10± 0.30
8.70
9.24
7.6
0.50
1.60
AS568
201~284
3.53± 0.10
3.07
3.34
2.51
0.25
0.79
309~395
5.33± 0.12
4.62
5.03
3.91
0.38
0.79
425~475
6.98± 0.15
6.12
6.53
5.21
0.38
1.59

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