This type of diaphragm
has no flange. An O-ring is molded to the bottom of the
sidewall. Unlike the other types of diaphragms, the Type
O is put into convolution by folding the sidewall back
onto itself. The bead is then squeezed into a groove machined
into the bonnet half of the hardware. This type enables
the greatest reduction in hardware diameter, while keeping
a full stroke potential.
Type
OA
This diaphragm type
is second generation to the Type O. It fits into identical
hardware. It differs from the Type O in that its sidewall
attaches to the inside diameter of the O-ring and the
fabric is on the outside, requiring the head corner radius
to be inverted for installation. The Type OA tends to
be easier to install but basically the difference is a
personal preference.
Dimensions and Tolerances
Inches
mm
Inches
mm
Inches
mm
Cylinder Diameter
1.00-2.50
25-64
2.51-4.00
64-102
4.01-8.00
102 & up
Bead
Diameter
.121
3.07
.151
3.84
2.42
6.15
Convolution
Width
.094
2.39
.156
3.96
2.50
6.35
Flash
Projection
.020 x .020 Max.
0.51 x .0.51 Max.
.030 x .030 Max.
0.76 x 0.76 Max.
.040 x .040 Max.
1.02 x 1.02 Max.
Wall
Gauge
.017
0.43
.024
0.61
.035
0.89
Piston
Radius
.063
1.60
.094
2.39
.125
3.18
Piston
Diameter
Cyl. Diam. less .188
Cyl. Diam. less 4.78
Cyl. Diam. less .313
Cyl. Diam. less 7.95
Cyl. Diam. less .500
Cyl. Diam. less 12.70
Flange Radius
.032
.81
.047
1.19
.063
1.60
Hardware
Design
Cylinder Diameter
Bead Groove Width = W
Bead Groove Height = H
Flange & Piston Corner Radii =
R1 & R2
Lip Radius = R3
Lip Height = L
(Inches)
(mm)
(Inches)
(mm)
(Inches)
(mm)
(Inches)
(mm)
(Inches)
(mm)
(Inches)
(mm)
1.00-2.50
25-64
.125
3.18
.096
2.43
.063
1.60
.025
0.63
.100
2.54
2.51-4.00
64-102
.156
3.96
.122
3.10
.094
2.39
.032
0.81
.130
3.30
4.01-8.00
102-205
.250
6.35
.196
4.98
.125
3.18
.045
1.14
.204
5.18
8.01 and up
205 and up
.250
6.35
.196
4.98
.125
3.18
.045
1.14
.190
4.83
Available Sizes
Dia•Com
Part No.
Cylinder
Diameter
Piston
Diameter
Height
Gauge
Approx.
Convolution
Width
Effective
Pressure
Area
Maximum
Half-Stroke
(Inches)
(mm)
(Inches)
(mm)
(Inches)
(mm)
(Inches)
(mm)
(Inches)
(mm)
(Inches)
*
(Inches)
(mm)
O-137-87
1.37
35
1.19
30
0.87
22
.017
0.43
.090
2.3
1.29
8.3
0.52
13.2
O-150-62
1.50
38
1.31
33
0.62
16
.017
0.43
.095
2.4
1.55
10.0
0.29
7.4
O-150-94
1.50
38
1.31
33
0.94
24
.017
0.43
.095
2.4
1.55
10.0
0.61
15.5
O-175-144
1.75
44
1.56
40
1.44
37
.017
0.43
.095
2.4
2.15
13.9
1.13
28.7
O-180-144
1.80
46
1.38
35
1.44
37
.025
0.64
.210
5.3
1.98
12.8
0.80
20.3
O-187-150
1.87
47
1.69
43
1.50
38
.017
0.43
.090
2.3
2.49
16.0
1.15
29.2
O-200-162
2.00
51
1.81
46
1.62
41
.017
0.43
.095
2.4
2.85
18.4
1.27
32.3
O-200-200
2.00
51
1.87
47
2.00
51
.017
0.43
.065
1.7
2.94
19.0
1.64
41.7
O-250-200
2.50
64
2.31
59
2.00
51
.017
0.43
.095
2.4
4.54
29.3
1.65
41.9
O-275-112
2.75
70
2.44
62
1.12
28
.024
0.61
.155
3.9
5.29
34.1
0.57
14.5
O-400-238
4.00
102
3.69
94
2.38
60
.035
0.89
.155
3.9
11.61
74.9
1.83
46.5
O-500-312
5.00
127
4.50
114
3.12
79
.035
0.89
.250
6.4
17.71
114.3
2.28
57.9
O-600-440
6.00
152
5.50
140
4.40
112
.035
0.89
.250
6.4
25.95
167.4
3.56
90.4
OA-50-53
.50
13
0.36
9
0.53
13
.015
0.38
.070
1.8
0.15
0.9
0.34
8.6
OA-75-85
0.75
19
0.55
14
0.85
22
.017
0.43
.100
2.5
0.33
2.1
0.46
11.7
OA-106-145
1.06
27
0.94
24
1.45
37
.017
0.43
.060
1.5
0.79
5.1
1.12
28.4
OA-112-69
1.12
28
0.94
24
0.69
18
.017
0.43
.090
2.3
0.83
5.4
0.33
8.4
OA-137-53
1.37
35
1.19
30
0.53
13
.017
0.43
.090
2.3
1.29
8.3
0.17
4.3
OA-187-197
1.87
47
1.69
43
1.97
50
.017
0.43
.090
2.3
2.49
16.0
1.69
42.9
OA-200-69
2.00
51
1.81
46
0.69
18
.017
0.43
.095
2.4
2.85
18.4
0.33
8.4
OA-225-137
2.25
57
2.06
52
1.37
35
.018
0.46
.095
2.4
3.65
23.5
1.01
25.7
OA-283-160
2.83
722
2.52
64
1.60
41
.024
0.61
.155
3.9
5.62
36.2
1.09
27.7
OA-462-350
4.62
117
4.00
102
3.50
89
.035
0.89
.310
7.9
14.58
94.1
2.86
72.6
OA-475-225
4.75
121
4.25
108
2.25
57
.017
0.43
.250
6.4
15.90
102.6
1.22
31.0
*Metric effective pressure
area shown in square centimeters.
