Superior medium-pressure double-lip oil seal


Superior medium-pressure double-lip oil seal 

Medium-pressure double-lip oil seal with integrated seal lip support.

Flexible lip design offers better shaft-following ability and reduced lip load over standard seal designs.  The premium low-friction Duralast™ material dynamic seal lip reduces friction, heat build-up, and wear. The secondary lip serves as both an effective protection against airside contaminants and as a lube retainer. Maximum service life can be achieved by applying a suitable lubricant between the two sealing lips.  The integrated seal lip support allows the seal to handle higher operating pressure. The low friction Duralast™ materials allow a high surface speed. The rubber-covered OD of the seal creates a tight seal with the housing bore.  Able to accommodate press-in fitment in housings with short axial length.

Operating Range
MaterialContinuous PressureMax. Pressure SpikeTemperatureSurface SpeedDry-runPV-Rating
Duralast 8838-LF110psi (7.6bar)200psi (14bar)-4 to 392°F (-20 to 200°C)Up to 4,200 fpm (21m/s)NO4
Fluoroelastomer (FKM),Viton®110psi (7.6bar)200psi (14bar)-4 to 392°F (-20 to 200°C)Up to 3,800 fpm (19m/s)NO3.6
Duralast 5117-LF110psi (7.6bar)200psi (14bar)-13 to 212°F (-25 to 100°C)Up to 1,500 fpm (7.5m/s)NO2
Nitrile (NBR)110psi (7.6bar)200psi (14bar)-13 to 212°F (-25 to 100°C)Up to 1,200 fpm (6m/s)NO1.8
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
B Diameter
Tol. +/- 0.010
Standard RangeFunctional RangeToleranceD=ToleranceB=Tol. +0.010/-0 min.max.
0.750-2.999"0.750 - 31.000"+/-0.0037/16A + 0.875+/-.001A + 0.1000.4500.383
3.000 - 5.999"0.750 - 31.000"+/-0.0041/2A + 1.000+/-.0015A + 0.2000.5120.4250.0900.030
6.000 - 13.999"1.000 - 31.000"+/-0.0055/8A + 1.250+/-.002A + 0.2000.6370.5300.1300.030
14.000 - 30.999"2.000 - 31.000"+/-0.0063/4A + 1.500+/-.003A + 0.2200.6370.5300.1500.030
31.000 - 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. Seal retaining plate for pressures above 7 psi recommended. Surface finish: Shaft (A) plunge ground, zero lead, Ra 8-16µin for rubber seal lip, Ra 6-12µin for PTFE seal lip. Housing (D,L) Ra 32-63µin, shaft material hardness 55-65RC. See Technical Info for more specific information.

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Seal Housing Drawing