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Black rubber rotary shaft seal with metal case, 1.25 in ID 1.687 in OD .25 in width

SKF

SKF 12336 rotary shaft seal 1.25 in ID 1.687 in OD .25 in width NBR CRW1

SKU CH-BH6W-C11YN

Seals 1.25 in shafts against oils, fuels and grease at speeds up to 3,600 RPM with nitrile lip and carbon-steel spring

  • Seals shafts up to 1.25 in ID with nitrile rubber lip
  • Withstands 10 psi pressure in oil and fuel systems
  • Handles 3 600 RPM rotational speed for engine use
  • Single-lip CRW1 design with carbon-steel spring for consistent contact
  • Acrylic-coated case resists corrosion in harsh environments

Precise rotary shaft seal for 1.25 in shafts

The SKF 12336 CRW1 seal fits a 1.25 in inside diameter and a 1.687 in outside diameter with a .25 in width. It is built for equipment that runs on inch-system shafts and needs a single-lip nitrile rubber seal. The acrylic-coated case presses into standard housings without modification. Mechanics and maintenance teams use it to replace worn seals on pumps, gearboxes and power-take-off units.

Thermals noise and power draw in normal use

The nitrile lip handles animal and vegetable oils, diesel, gasoline, greases, hot water, light heating oil and mineral oils at up to 10 psi. Carbon-steel spring tension keeps contact pressure steady through 3,600 RPM and 6 mps surface speed. No external lubrication or cooling is required beyond the sealed fluid itself. The single-lip design limits drag so the shaft runs quietly and efficiently.

Critical specification shaft speed limit

Maximum rotational speed is 3,600 RPM, so the seal suits moderate-speed shafts but not high-speed spindles or turbine drives. Exceeding this limit accelerates lip wear and can cause premature leakage. Verify the operating RPM of your shaft before specifying this part. Builders needing higher speed ratings must select a different seal design.

Highlights

  • Seals shafts up to 1.25 in ID with nitrile rubber lip
  • Withstands 10 psi pressure in oil and fuel systems
  • Handles 3 600 RPM rotational speed for engine use
  • Single-lip CRW1 design with carbon-steel spring for consistent contact
  • Acrylic-coated case resists corrosion in harsh environments

Specifications

BrandSKF

Questions about this item

How is the CRW1 seal with 1.25 in ID and 1.687 in OD installed, and what step is often missed?

Press the seal squarely into the housing until the acrylic-coated case seats fully; the step often missed is lubricating the nitrile lip with clean oil before sliding the shaft through to avoid dry-start damage.

What maintenance or replacement will the nitrile lip and carbon-steel spring need later?

Inspect the single lip for hardening, cracking or spring fatigue at each oil change; replace the seal if leakage appears or the lip has lost elasticity from heat and fluid exposure.

What limit shows up first under sustained use at the 3,600 RPM rating?

The 6 m/s surface-speed limit combined with the 10 psi pressure ceiling typically causes lip overheating and wear before the carbon-steel spring or acrylic case coating fails.

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