We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Transparent SKF 18657 rotary shaft seal, 1.875 in ID, 2.75 in OD, .313 in wide

SKF

SKF 18657 Rotary Shaft Seal CRW1 NBR 1.875 2.75 .313 in

SKU CH-7HXT-G1FFA

Rotary shaft seal with nitrile rubber lip, carbon steel spring and 10 psi pressure rating for oils, greases and hot water up to 3,060 RPM

  • ColorTransparent
  • NBR lip handles animal and vegetable oils diesel gasoline greases hot water light heating oil mineral oils
  • CRW1 contact seal with carbon steel spring maintains sealing at 3060 RPM max rotational speed
  • 10 psi pressure rating suits low pressure rotary applications up to 7.64 mps surface speed
  • Precise 1.875 in ID 2.75 in OD .313 in width fits standard inch dimension housings
  • Acrylic coated case protects against corrosion during installation and service life

SKF 18657 Rotary Shaft Seal

The SKF 18657 is a CRW1-design rotary shaft seal built for engines and rotating equipment. It fits a 1.875 in shaft inside a 2.75 in bore with a .313 in overall width. The single nitrile rubber lip and carbon-steel spring suit maintenance crews and rebuilders sealing oil, fuel, grease or water.

Thermals, noise and power draw

As a static elastomer component the seal generates no heat, draws no power and produces no sound of its own. Frictional warmth at the lip stays within normal limits for nitrile rubber running up to 3,060 RPM and 7.64 mps surface speed. Acrylic case coating helps the metal shell resist the listed fluids without adding thermal load.

10 psi maximum pressure limit

The seal is rated for only 10 psi differential pressure, so it cannot handle pressurised hydraulic circuits or high-pressure pump outlets. Builders needing to seal above this pressure must choose a different profile or a pressurised-face design. The single-lip construction also rules out applications that demand a redundant sealing lip.

Highlights

  • NBR lip handles animal and vegetable oils diesel gasoline greases hot water light heating oil mineral oils
  • CRW1 contact seal with carbon steel spring maintains sealing at 3060 RPM max rotational speed
  • 10 psi pressure rating suits low pressure rotary applications up to 7.64 mps surface speed
  • Precise 1.875 in ID 2.75 in OD .313 in width fits standard inch dimension housings
  • Acrylic coated case protects against corrosion during installation and service life

Specifications

BrandSKF
ColorTransparent

Questions about this item

How do I press the 1.875 in ID seal into a 2.75 in bore without damaging the acrylic-coated case?

Use a flat driver plate that contacts only the outer metal case, press squarely until the case seats flush, and avoid hammering on the flexible NBR lip.

When should I plan to replace the nitrile rubber lip on this CRW1 seal?

Replace the lip when you see hardening, cracking, or leakage; NBR degrades faster with hot water or diesel exposure, so inspect at every major service interval.

What is the first limit reached if the shaft runs continuously at 3,060 RPM?

The 7.64 m/s surface-speed rating is reached first; exceeding it causes lip overheating and rapid wear even though the 10 psi pressure limit is not exceeded.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.