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SKF 23646 nitrile shaft seal, transparent, 3/8 inch wide

SKF

SKF 23646 Shaft Seal 2-3/8 x 3-1/8 x 3/8" CRW1 Nitrile engine tool

SKU CH-40K4-TNT74

Rotary shaft seal for oils, fuels, grease and hot water, rated to 10 psi and 2,700 RPM

  • Product colorTransparent
  • Overall width3/8 in
  • Seals shafts up to 2,700 RPM with nitrile lip
  • Resists oil, fuel and grease at 10 psi max pressure
  • Spring-loaded carbon-steel lip maintains contact at 8.6 m/s surface speed
  • Acrylic-coated case protects against corrosion in harsh fluids
  • Precision inch dimensions 2.375 in ID × 3.125 in OD × .375 in width

Product Identity

The SKF 23646 is a rotary shaft seal built to the CRW1 design code with a nitrile rubber lip. It suits maintenance teams and engine rebuilders who need a direct replacement for worn sealing surfaces.

Functional Impact

The single carbon-steel spring maintains lip contact up to 10 psi and 2,700 RPM. Nitrile material resists gasoline, diesel, mineral oils, greases, animal and vegetable oils, and hot water, so the seal performs across common lubricants and coolants without swelling or hardening.

Build and Fit

A 2.375 in inside diameter, 3.125 in outside diameter and .375 in width match the housing bore and shaft dimensions specified in the design code. Acrylic case coating eases installation and protects the metal shell from corrosion during service.

How it compares

Measured against everything we stock in Engine Service & Diagnostic Tools, at today’s prices. Recalculated every night.

Price $13.99
Cheaper than about 70% of the 1,113 comparable items (median $19.99).

Specifications

Product
Brand nameSKF
Product colorTransparent
Size & build
Overall width3/8 in

Questions about this item

How often should the nitrile lip on the SKF 23646 seal be inspected or replaced?

The nitrile lip is a wear item; inspect it at every service interval and replace it if the lip shows hardening, cracking or leakage.

What rotational speed limit will be reached first during continuous operation?

The seal is rated for a maximum of 2,700 RPM; exceeding this speed will cause premature lip wear and leakage.

How hot does the seal area get when the shaft runs at the rated 8.6 mps surface speed all day?

At the rated 8.6 mps the lip temperature stays within nitrile limits, but sustained operation near the 10 psi pressure limit will raise local heat.

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