Symmetrical SC-Spring Rod or Piston Seal with Round Seal Lips
For use as either rod or piston seal in dynamic sealing application. SC-spring provides a deflection range similar to the V-spring but with a relatively flat and moderate spring load versus deflection, making it ideal for friction-sensitive sealing applications. The rounded contact surface of the seal lip promotes a thicker lubrication film on the mating sealing surface, leading to less wear and a longer seal life. The seal may weep in high-speed reciprocating applications, and is not recommended for abrasive media.
Various material compound and spring combinations are available for aggressive chemicals, NACE service, chlorine service, cryogenic service, FDA (both contact and non-contact), fugitive emissions, as well as control fluids, hydraulic fluids, dry running in a wide range of gases
Material Permachem xxxx will be selected by AHPSeals to match your operating conditions.
*Important Note: Maximum values above depend on extrusion gap, clearances, seal material, media, temperatures, pressures, surface speed, dynamic running surface finish and working environment. Seals cannot be operated at their upper ratings at the same time. For pressure above 3.000psi (210bar)or temperature above 200°F (95°C), please contact engineering for seal material and hardware specification.
Size Table (Inch)The standard range sizes listed below are the preferred sizes for new design applications. Seals are available for any size in 0.001inch increments, including functional range. Additionally, we offer any other seal size as required.
A
Diameter
Tolerances
CS
Cross-section*
D
Diameter
B**
Diameter
BP**
Diameter
Tolerances
L
Standard ≤3.000psi
L
Extended >3.000psi
S
C
R
Radius
Standard Range
Functional Range
A, BP
D=
B=
BP=
D, B
Tolerances +0.010/-0
min.
min.
max.
0.125 - 0.249
0.125 - 4.000"
+0/-0.001
1/16
A + 0.125
A + 0.004
D - 0.004
+0.001/-0
0.095
0.150
0.050
0.025
0.008
0.250 - 0.874"
0.230 - 6.000"
+0/-0.002
3/32
A + 0.187
A + 0.006
D - 0.006
+0.002/-0
0.140
0.180
0.070
0.025
0.015
0.875 - 1.674"
0.335 - 20.000"
+0/-0.002
1/8
A + 0.250
A + 0.008
D - 0.008
+0.002/-0
0.185
0.235
0.090
0.030
0.015
1.675 - 4.999"
0.750 - 30.000"
+0/-0.002
3/16
A + 0.375
A + 0.012
D - 0.012
+0.002/-0
0.280
0.330
0.110
0.060
0.015
5.000 - 21.999"
1.575 - 71.000"
+0/-0.004
1/4
A + 0.500
A + 0.016
D - 0.016
+0.004/-0
0.375
0.475
0.140
0.080
0.015
22.000 - 40.999"
1.575 - 71.000"
+0/-0.005
5/16
A + 0.625
A + 0.020
D - 0.020
+0.005/-0
0.460
0.580
0.150
0.110
0.020
41.000 - 71.000"
consult AHPSeals engineering
*Standard cross-sections (CS) listed and non-standard sizes can be provided for any shaft size up to 71 inches. ** Based on using no wear rings, larger clearance required if using wear rings.
For pressure above 3.000psi or temperature above 200°F contact engineering for clearances. Surface finish: Shaft (A) plunge ground, Ra 4-8µin - Housing (D,L) Ra 16-32µin.
Shaft material hardness 55-65RC. See Technical Info for more specific information.
Size Table (Metric)The standard range sizes listed below are the preferred sizes for new design applications. Seals are available for any size in 0.01mm increments, including functional range. Additionally, we offer any other seal size as required.
A
Diameter (mm)
Tol. h8
CS
Cross-section*
D
Bore
Diameter
Tol. H8
B**
Diameter
Tol. H9
BP**
Diameter
Tol. h9
L
Standard ≤210 bar
L
Extended >210 bar
S
C
R
Radius
Standard Range
Functional Range
D=
B=
BP=
Tolerances +0.20/-0
Tol.+0.10/-0
min.
max.
3.00 - 5.99
3.00 - 100.00
2.00
A + 4.00
A + 0.10
D - 0.10
2.50
4.00
1.60
0.70
0.20
6.00 - 22.19
5.80 - 150.00
2.50
A + 5.00
A + 0.15
D - 0.15
3.70
4.70
1.80
0.80
0.40
22.20 - 42.99
8.00 - 500.00
3.50
A + 7.00
A + 0.20
D - 0.20
4.80
6.00
2.30
1.00
0.40
43.00 -126.99
20.00 - 760.00
5.00
A + 10.00
A + 0.30
D - 0.30
7.10
8.50
2.80
1.50
0.40
127.00 - 559.99
40.00 - 1800.00
6.50
A + 13.00
A + 0.40
D - 0.40
9.50
12.00
3.50
2.00
0.40
560.00 - 1049.99
40.00 - 1800.00
8.00
A + 16.00
A + 0.50
D - 0.50
11.70
14.60
3.80
2.40
0.50
1050.00 - 1800.00
consult AHPSeals engineering
*Standard cross-sections (CS) listed and non-standard sizes can be provided for any shaft size up to 1800mm. **Based on using no wear rings, larger clearance required if using wear rings.
For pressure above 210 bar or temperature above 95°C contact engineering for clearances. Surface finish: Shaft (A) plunge ground, zero lead Ra 0.1-0.20µm -Housing (D,L) Ra 0.4-0.8µm. Shaft material hardness 55-65RC. See Technical Info for more information.
