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Small transparent rubber shaft seal with metal spring visible inside circular form

SKF

SKF 11907 CRW1 NBR Shaft Seal 1.188 x 2.125 x .313 in

SKU CH-MEE6-YDPBY

Rotary shaft seal with 1.188 in bore, 2.125 in outside diameter, 0.313 in width, NBR lip and carbon-steel spring rated to 3,660 RPM

  • ColorTransparent
  • Reliable sealing with CRW1 design code
  • Nitrile rubber lip handles oils, diesel and gasoline
  • Carbon-steel spring maintains consistent lip pressure
  • Acrylic-coated case resists corrosion in harsh fluids
  • Rated for 3,660 RPM and 5.79 m/s surface speed

SKF 11907 CRW1 NBR Shaft Seal

The SKF 11907 CRW1 is a rotary shaft seal designed for engines and rotating equipment where a 1.188 in shaft passes through a 2.125 in bore. It suits maintenance technicians and engineers who need a direct replacement seal for mineral oils, diesel, gasoline, greases, hot water, light heating oil, or animal and vegetable oils.

Limits of the CRW1 design at 3,660 RPM

The single-lip CRW1 design with nitrile rubber handles a maximum pressure of 10 psi and a maximum surface speed of 5.79 mps. At the rated 3,660 RPM the carbon-steel spring maintains lip contact, but higher speeds or pressures exceed the material capability and will cause premature wear or leakage.

Replaces worn seals on 1.188 in shafts

This seal replaces a damaged or leaking unit on the same shaft and bore dimensions when the original lip has hardened, the spring has lost tension, or the case coating has deteriorated. The jump is worth it when fluid loss appears at the shaft exit or when scheduled maintenance calls for a fresh nitrile lip and acrylic-coated case.

Highlights

  • Reliable sealing with CRW1 design code
  • Nitrile rubber lip handles oils, diesel and gasoline
  • Carbon-steel spring maintains consistent lip pressure
  • Acrylic-coated case resists corrosion in harsh fluids
  • Rated for 3,660 RPM and 5.79 m/s surface speed

Specifications

BrandSKF
ColorTransparent

Questions about this item

Should I choose the 1.188 in inside diameter or the 2.125 in outside diameter for my shaft?

The 1.188 in inside diameter matches the shaft size; the 2.125 in outside diameter fits the housing bore. Both dimensions are fixed on this seal.

What does the 3,660 RPM limit mean once the seal is installed?

It is the maximum rotational speed the lip can handle without overheating; exceeding it risks premature wear or leakage.

How does the 10 psi pressure rating cap real-world use?

The seal is designed for low-pressure applications up to 10 psi; higher system pressure will push past the lip and cause leaks.

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