Flanged double-lip PTFE rotary shaft seal

SB41


Flanged double-lip PTFE rotary shaft seal

This flanged seal design incorporates redundant seal lips that provide higher pressure and better sealing capabilities, especially under flooded conditions. The soft OD eliminates damage to housings, is capable of handling extreme temperatures, aggressive media, high surface speeds, low to medium pressures, and can even run dry. The soft seal OD eliminates damage to housings manufactured from expensive metals, and the flange serves as an anti-rotation device where media being sealed precludes the use of an elastomer. It is typically used to provide, high-pressure solution and as a secondary seal in a purging or ported system. Small quantities are available in 2-4 days.




Operating Range
MaterialContinuous PressureMax.Pressure SpikeTemperatureSurface SpeedApplicationDry-runPV-Rating
Permachem 6233200psi (14bar)300psi (20bar)-80 to 400°F (-60 to 200°C)Up to 3,500 fpm (17.5m/s)standard oil lubrication, high waterbased fluidsYES8
Permachem 6235200psi (14bar)300psi (20bar)-80 to 400°F (-60 to 200°C)Up to 3,500 fpm (17.5m/s)Soft shaft material, gaseous media, FDA compliantYES8
Duraloy 4736200psi (14bar)300psi (20bar)-80 to 400°F (-60 to 200°C)Up to 3,500 fpm (17.5m/s)low wear and abrasion, long service lifeYES8
Size Table (Inch)Standard sizes listed below are preferred sizes for new design applications; however, we offer any other seal size as required. Seals are available for any shaft diameter size in 0.001 inch increments without tooling charges, including Functional Range.
A
Shaft Diameter
CS
Cross-section*
D
Bore
Diameter
B
Diameter
**
Tolerances
K
F
L
Single Lip
L
Double Lip
H
C
R
Standard Range
Functional Range
Tolerance
D=
B=
D, B
+ 0.010/-0
+0/-.004
Tolerances +0.010/-0
min.
max.
0.315 - 1.999"
0.315 - 5.000"
+0/-0.003
1/4
A + 0.500
A + 0.030
+/-0.001
A + 0.820
0.080
0.340
0.390
0.025
0.025
0.015
2.000 - 5.999"
0.315 - 18.000"
+0/-0.003
3/8
A + 0.750
A + 0.030
+/-0.002
A + 1.230
0.080
0.470
0.470
0.035
0.030
0.015
6.000 - 15.999"
0.500 - 26.000"
+0/-0.004
1/2
A + 1.000
A + 0.035
+/-0.002
A + 1.600
0.090
0.540
0.600
0.055
0.060
0.015
16.000 - 25.999"
1.000 - 26.000"
+0/-0.006
5/8
A + 1.250
A + 0.040
+/-0.003
A + 1.95
0.100
0.610
0.610
0.065
0.080
0.015
26.000 - 63.000"
consult AHPSeals engineering
*Standard cross-sections (CS) listed and non-standard sizes can be provided for any shaft size up to 63 inches.**For pressure above 3,000psi or temperature above 200°F, contact engineering for clearances. Surface finish: Shaft (A) plunge ground, zero lead Ra 6-12µin, Housing (D,L) Ra 16-32µin. Shaft material hardness 55-65RC. See Technical Info for more specific information.

Seal Size Selector – Request a Quote

  • Enter shaft, rod or bore diameter
  • If recommended size is not feasible, please enter your preferred dimensions
  • If recommended size is not feasible, please enter your preferred dimensions
Back to Products page
Seal Housing Drawing