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A small black rubber ring with a thin metal spring visible inside the lip, shown lying flat on a light surface

SKF

SKF 12577 Rotary Shaft Seal 1.25 x 2.25 x .25 in CRW1 Nitrile

SKU CH-VVJ0-RKWWH

Rotary shaft seal for 1.25 in shafts with nitrile lip rated to 10 psi and 3,600 RPM

  • ColorTransparent
  • Seals shafts reliably with nitrile rubber lip
  • Handles oils, fuels, greases and hot water
  • Withstands up to 10 psi pressure
  • Rated for 3,600 RPM maximum speed
  • Installs easily in 1.25 in bore

SKF 12577 Rotary Shaft Seal

The SKF 12577 is a CRW1-design rotary shaft seal built for equipment shafts measuring 1.25 in. It fits a 2.25 in. bore with an overall width of .25 in. Mechanics and maintenance teams use it to retain lubricants and exclude contaminants in automotive and industrial power-transmission assemblies.

Nitrile lip runs at 3 600 RPM

The single nitrile-rubber lip handles animal and vegetable oils, diesel, gasoline, greases, hot water, light heating oil and mineral oils. A carbon-steel garter spring maintains radial load up to a maximum pressure of 10 psi. Acrylic case coating eases installation and resists bore corrosion during service.

Replaces worn lip seals on 1.25 in. shafts

Install when the original seal leaks, hardens or loses spring tension after heat cycling. The jump is worth it when shaft run-out and bore condition are still within tolerance so the new lip can seat without groove wear. Not for applications exceeding 10 psi or 3 600 RPM.

Highlights

  • Seals shafts reliably with nitrile rubber lip
  • Handles oils, fuels, greases and hot water
  • Withstands up to 10 psi pressure
  • Rated for 3,600 RPM maximum speed
  • Installs easily in 1.25 in bore

Specifications

BrandSKF
ColorTransparent

Questions about this item

How do I install the SKF 12577 seal and what step is often missed?

Press the 1.25 in inside diameter evenly into the 2.25 in bore using a seal driver; the step often missed is lubricating the nitrile lip with clean oil before insertion to prevent dry-start damage.

What maintenance or replacement will the SKF 12577 seal need later?

Inspect the single nitrile lip and carbon-steel spring at every oil change; replace the seal if the lip hardens, cracks, or leaks, as the CRW1 design is not serviceable.

What limit appears first during sustained use of the SKF 12577 seal?

The 10 psi pressure ceiling is reached before the 3,600 RPM or 6 m/s speed ratings, so excess crankcase pressure will fail the lip first.

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