High-pressure single-lip PTFE rotary shaft seal

This seal design incorporates an anti-extrusion and support ring geometrically matched to the primary seal lip. This seal is capable of handling higher pressures, extreme temperatures, aggressive media, high surface speeds, and can even run dry. Fits in the same hardware pocket as SB40 Style. An integrated O-ring on the OD of the seal serves as an anti-rotation device and maximizes static sealing between the seal and the bore. Small quantities are available in 2-4 days.

Operating Range
MaterialContinuous PressureMax.Pressure SpikeTemperatureSurface SpeedApplicationDry-runPV-Rating
Permachem 6233500psi (35bar)750psi (50bar)-58 to 400°F (-50 to 200°C)Up to 3,500 fpm (17.5m/s)standard oil lubrication, high waterbased fluidsYES10
Permachem 6235500psi (35bar)750psi (50bar)-58 to 400°F (-50 to 200°C)Up to 3,500 fpm (17.5m/s)Soft shaft material, gaseous media, FDA compliantYES10
Duraloy 4736500psi (35bar)750psi (50bar)-58 to 400°F (-50 to 200°C)Up to 3,500 fpm (17.5m/s)low wear and abrasion, long service lifeYES10
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, including Functional Range.
Shaft Diameter
Bore Diameter
wiper lip +/- 0.010
wiper lip +/- 0.010
Standard RangeFunctional RangeTolerance*D=ToleranceB=
0.315 - 0.999"0.315 - 5.000"+/-0.0031/4A + 0.500+/-.001A + 0.030A + 0.1200.3250.2650.0700.020
1.000 - 5.999"0.315 - 18.000"+/-0.0033/8A + 0.750+/-.001A + 0.030A + 0.1200.3250.2650.0850.020
6.000 - 15.999"0.500 - 26.000"+/-0.0041/2A + 1.000+/-.002A + 0.035A + 0.1200.3750.3100.0900.030
16.000 - 25.999"0.500 - 26.000"+/-0.0065/8A + 1.250+/-.003A + 0.040A + 0.1200.5120.4250.1000.030
26.000 - 63.000"consult with Ahpseals engineering
*Standard cross-sections (CS) listed and non-standard sizes can be provided for any shaft size up to 63 inches.Surface finish: Shaft (A) plunge ground, zero lead Ra 6-12µin - Housing (D,L) Ra max. 32µin - Shaft material hardness 55-65RC. Use of installation tool is highly recommended. See Technical Info for more specific information.

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Seal Housing Drawing