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Transparent rotary shaft seal with metal case and spring

SKF

SKF 34860 Shaft Seal 3.5 in ID 4.376 in OD .375 in Width CRW1 NBR

SKU CH-QWHW-R4HFA

Rotary shaft seal with 3.5 in inside diameter, 4.376 in outside diameter, .375 in width, nitrile rubber lip and carbon steel spring for oils, greases and fuels up to 10 psi and 2,160 RPM

  • ColorTransparent
  • Width3/8"
  • Designed for rotary shafts with a 3.5 in bore
  • Nitrile rubber lip handles oils, greases, diesel and gasoline
  • Single-lip CRW1 design rated to 10 psi max pressure
  • Carbon steel spring maintains lip contact up to 2,160 RPM
  • Acrylic-coated case protects against corrosion in harsh fluids

Rotary Shaft Seal 3.5 in ID

This SKF rotary shaft seal fits a 3.5 in shaft inside a 4.376 in bore with a .375 in overall width. The CRW1 design uses a single nitrile rubber lip held by a carbon steel spring and an acrylic-coated case. It is intended for technicians and maintenance teams replacing worn seals on rotating equipment.

Single Lip Contact Seal

The single contact lip rides on the shaft surface to retain lubricants and exclude contaminants during operation. The nitrile rubber compound resists mineral oils, gasoline, diesel, greases, animal and vegetable oils, light heating oil and hot water. A carbon steel garter spring maintains consistent lip pressure across the 10.17 mps maximum surface speed.

10 psi Maximum Pressure Rating

This seal is rated for a maximum pressure of 10 psi, limiting its use to low-pressure or vented housings such as gearboxes, pumps or engine crankshafts. Builders needing higher pressure retention or dual-lip exclusion should select a different seal design. The inch-dimensioned housing must match the 3.5 in inside diameter and 4.376 in outside diameter exactly.

Highlights

  • Designed for rotary shafts with a 3.5 in bore
  • Nitrile rubber lip handles oils, greases, diesel and gasoline
  • Single-lip CRW1 design rated to 10 psi max pressure
  • Carbon steel spring maintains lip contact up to 2,160 RPM
  • Acrylic-coated case protects against corrosion in harsh fluids

Specifications

BrandSKF
ColorTransparent
Width3/8"

Questions about this item

What maximum rotational speed does the CRW1 seal design support?

The CRW1 design is rated for a maximum rotational speed of 2,160 RPM.

What shaft diameter and housing bore does the 3.5 in ID and 4.376 in OD seal fit?

It fits a 3.5 in shaft diameter and requires a 4.376 in housing bore.

How is the spring-loaded lip installed, and which orientation error causes leaks?

Press the seal evenly with the spring-loaded lip facing the fluid; installing it backwards lets pressure unseat the lip.

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