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
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.
