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SKF 21211 rotary shaft seal transparent nitrile rubber .5 in wide

SKF

SKF 21211 Shaft Seal CRWA1 NBR 2.125x3.061x.5 in

SKU CH-AY4C-N47S0

Rotary shaft seal fits 2.125 in ID by 3.061 in OD with .5 in width, NBR lips handle oils, greases and fuels to 10 psi and 880 RPM

  • ColorTransparent
  • Width1/2"
  • Reliable sealing at up to 10 psi pressure
  • Nitrile rubber lips handle oils, fuels and hot water
  • Carbon-steel spring maintains lip force up to 880 RPM
  • Acrylic-coated case resists corrosion in harsh fluids
  • Precise 2.125 in ID fits standard shaft dimensions

Automotive shaft seal 21211

The SKF 21211 is a rotary shaft seal built to the CRWA1 design code. It fits a 2.125 in shaft and seats in a 3.061 in bore with an overall width of .5 in. Mechanics and maintenance teams use it to retain lubricants and exclude contaminants on rotating equipment.

Replaces worn lip seals on oil-lubricated shafts

This unit upgrades a hardened or leaking single-lip seal where fluid loss or dirt ingress has begun. The jump is worth it when the original seal can no longer hold 10 psi or when shaft speed approaches 2,880 RPM and a dual-lip design with a carbon-steel spring is specified.

Sustained sealing at rated speed and pressure

The nitrile rubber lips and acrylic-coated case maintain contact at surface speeds up to 8.15 mps. Two sealing lips share the load so the spring retains radial force over long runs. The seal handles animal and vegetable oils, diesel, gasoline, greases, hot water, light heating oil and mineral oils without softening.

Not for dry-running or vacuum applications

Buyers who need a seal for unlubricated shafts or negative-pressure systems cannot use this contact-type design. It also does not suit pressures above the rated limit or speeds beyond the stated maximum.

Highlights

  • Reliable sealing at up to 10 psi pressure
  • Nitrile rubber lips handle oils, fuels and hot water
  • Carbon-steel spring maintains lip force up to 880 RPM
  • Acrylic-coated case resists corrosion in harsh fluids
  • Precise 2.125 in ID fits standard shaft dimensions

Specifications

BrandSKF
ColorTransparent
Width1/2"

Questions about this item

What bore diameter and housing depth does the 2.125 in ID and 3.061 in OD seal require?

The seal fits a 2.125 in shaft and a 3.061 in bore; the housing must accommodate the .5 in overall width.

How is the CRWA1 double-lip seal seated without damaging the nitrile lips?

Press the acrylic-coated case squarely into the bore using a flat tool on the outer face; never hammer the inner lip.

When should the seal be replaced given the 880 RPM and 8.15 mps limits?

Replace at first sign of leakage or lip hardening; the nitrile material degrades faster if run continuously near the 880 RPM or 8.15 mps ratings.

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