General Description
This style diaphragm is similar in function to the Type FC diaphragm, while the sealing and hardware designs are the same as the Type D. Type DC Diaphragm

Dimensions and Tolerances
Type DC Dimensions and Tolerances

Inches mm Inches mm Inches mm Inches mm Inches mm
Cylinder Diameter
.37-.99
9-25
1.00-2.50
25-64
2.51-4.00
64-102
4.01-8.00
102-205
8.01 & up
205 & up
Height
See available sizes table
Cylinder Diameter
Tolerances on Cylinder Diameter and Piston Diameter are ± 0.010 per inch (0.254 mm) of diameter but the tolerance will be no less than ± 0.010 (0.254 mm) or greater than ± 0.060 (1.52 mm)
Piston Diameter
Head & Flange Thickness
.015 ± .003
0.38 ± 0.08
.017 ± .004
0.43 ± 0.10
.024 ± .004
0.61 ± 0.10
.035 ± .005
0.89 ± 0.13
.045 ± .007
1.14 ± 0.18
Wall Gauge
.015 ± .003
0.38 ± 0.08
0.17 ± .004
0.43 ± 0.08
.024 ± .004
0.61 ± 0.10
.035 ± .005
0.89 ± 0.13
.045 ± .007
1.14 ± 0.18
Flash Projection
.025 Max.
0.64 Max.
.025 Max.
0.64 Max.
.035 Max.
0.89 Max.
.040 Max.
1.02 Max.
.056 Max.
1.42 Max.
Flash Thickness
.025 Max.
0.64 Max.
.025 Max.
0.64 Max.
.035 Max.
0.89 Max.
.040 Max.
1.02 Max.
.056 Max.
1.42 Max.
Piston/Flange Radius
.031
.075 Max
.063
1.60 Max
.094
2.39
.125
3.18
.125
3.18
Flange Diameter
Cyl. Diam. + .313
Cyl. Diam. + 7.95
Cyl. Diam. + .500
Cyl. Diam. + .12.70
Cyl. Diam. + .750
Cyl. Diam. + 19.50
Cyl. Diam. + 1.000
Cyl. Diam. + 25.40
Cyl. Diam. + 1.000
Cyl. Diam. + 25.40
Bead Width
.094 ± .003
2.39 ± 0.08
.125 ± .003
3.18 ± 0.08
.187 ± .003
4.75 ± 0.08
.250 ± .003
6.35 ± 0.08
.250 ± .004
6.35 ± 0.10
Bead Height
.095 ± .004
2.41 ± 0.10
.135 ± .004
3.43 ± 0.10
.200 ± .005
5.08 ± 0.13
.270 ± .006
6.86 ± 0.15
.270 ± .008
6.86 ± 0.20


Diaphragm Flange Diameter and Hole Trim Tolerance
Diameter Size Position
(Inches) (mm) (Inches) (mm) (Inches) (mm)

0-1.00
.0-25.40
± .010
0.25
.010
0.25

1.01-3.00
25.65-76.20
± .020
0.51
.020
0.51

over 3.01
over 76.45
± .030
0.76
.030
0.76

Angular Relationship of holes: ± 1/2 degree.

Hardware Recommendations
TYpe DC Hardware Recommendations


Cylinder Diameter
.25-.99
6-25
1.00-2.50
25-64
2.51-4.00
64-102
4.01-8.00
102-205
8.01 & up
205 & up

Groove Width
.109
2.77
.141
3.58
.219
5.56
.281
7.14
.281
7.14

± .003
0.08 ±

Groove Height
.076
1.93
.105
2.67
.160
4.06
.224
5.69
.224
5.69

± .002
0.05 ±

Flange & Piston Corner Radii
.031
0.79
.063
1.60
.094
2.39
.125
3.18
.125
3.18

Lip Width
.062
1.57
.125
3.18
.187
4.75
.250
6.35
.250
6.35

± .003
0.08 ±

Lip Clearance
.021
0.53
.021
0.53
.031
0.79
.036
0.91
.048
1.22

± .003
0.08 ±


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)

DC-37-12
0.37
9
0.27
7
0.12
3
.017
0.43
.050
1.3
0.08
0.5
0.11
2.8

DC-62-10
0.62
16
0.50
13
0.10
3
.020
0.51
.060
1.5
0.25
1.6
0.07
1.8

DC-69-12
0.69
18
0.50
13
0.12
3
.017
0.43
.095
2.4
0.28
1.8
0.05
1.3

DC-91-15
0.91
23
0.72
18
0.15
4
.020
0.51
.095
2.4
0.52
3.4
0.01
0.3

DC-125-15
1.25
32
1.05
27
0.15
4
.017
0.43
.100
2.5
1.04
6.7
0.08
2.0

DC-150-15
1.50
38
1.31
33
0.15
4
.017
0.43
.095
2.4
1.55
10.0
0.08
2.0

DC-175-15
1.75
44
1.56
40
0.15
4
.017
0.43
.095
2.4
2.15
13.9
0.08
2.0

*Metric effective pressure area shown in square centimeters.