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SKF 29865 rotary shaft seal, translucent nitrile rubber, 3/8 inch wide

SKF

SKF 29865 Shaft Seal 3/8" Width CRW1 Nitrile Rubber

SKU CH-Q4Y9-53TYF

Rotary shaft seal with nitrile rubber lip, 3/8" width, rated for 10 psi and 2,400 RPM

  • ColorTransparent
  • Width3/8"
  • Reliable sealing for oils and fuels up to 10 psi
  • CRW1 design with nitrile rubber lip resists wear at 2,400 RPM
  • Carbon steel spring maintains consistent lip pressure across 0.375 in width
  • Acrylic-coated case protects against corrosion in harsh environments
  • SKF quality shaft seal built for gasoline, diesel, grease and hot water applications

Product Identity

The SKF 29865 is a rotary shaft seal designed for automotive engine sealing tasks. It suits mechanics and DIYers who need a reliable lip seal for rotating shafts in fluid systems.

Critical Specification

The seal has a 3-inch inside diameter and a 3.751-inch outside diameter with a .375-inch width. Its nitrile rubber lip handles animal and vegetable oils, diesel, gasoline, greases, hot water, light heating oil and mineral oils at up to 10 psi and 2,400 RPM.

Installation Notes

The CRW1 design uses a carbon steel spring to maintain lip contact against the shaft. Correct shaft surface finish and alignment are essential; damage or misalignment during fitting commonly causes premature leakage. The acrylic-coated case aids installation in the bore.

Highlights

  • Reliable sealing for oils and fuels up to 10 psi
  • CRW1 design with nitrile rubber lip resists wear at 2,400 RPM
  • Carbon steel spring maintains consistent lip pressure across 0.375 in width
  • Acrylic-coated case protects against corrosion in harsh environments
  • SKF quality shaft seal built for gasoline, diesel, grease and hot water applications

Specifications

BrandSKF
ColorTransparent
Width3/8"

Questions about this item

What does the 10 psi pressure rating mean once the seal is installed?

It indicates the maximum fluid pressure the lip can hold without leaking; above that the seal may extrude or blow by.

How does the CRW1 design code limit what the seal can do in practice?

CRW1 defines a single-lip, spring-loaded radial seal with an acrylic-coated case, suited for rotary shafts up to 2,400 RPM and 9.55 m/s surface speed.

What shaft and bore dimensions does the 3 in ID and 3.751 in OD require for a proper fit?

The seal fits a 3-inch shaft and a 3.751-inch housing bore; the 0.375-inch width determines the axial space needed in the groove.

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