24mm TC Oil Seal — Metric R23 NBR Double-Lip Rotary Shaft Seal (ID 24mm)

Measure three dimensions: the shaft inner diameter (ID), the housing bore outer diameter (OD), and the available axial housing depth (height). All variants in this listing share a fixed 24mm (≈15/16") inner diameter. Select the OD and height that match your housing. For example, if your bore is 35mm deep and 7mm wide, choose the 24 × 35 × 7mm variant. When in doubt, consult your equipment service manual or contact us to confirm.

TC stands for Type C — a double-lip seal design. The primary (inner) lip faces the lubricant side and retains oil or grease. The secondary (outer) dust lip faces the atmosphere and blocks dirt, water, and debris from reaching the primary lip. This two-barrier arrangement makes TC seals the standard choice for gearboxes, axles, and rotating shaft applications exposed to contamination.

TC rotary shaft seals are generally designed for low-to-moderate pressure applications — typically splash lubrication or low-pressure oil retention rather than pressurized hydraulic circuits. Shaft surface speed is typically rated up to 4–8 m/s depending on lubricant viscosity and shaft surface finish. For high-pressure hydraulic applications, a different seal type is generally recommended. Contact us to confirm suitability for your specific operating conditions.

NBR (Nitrile Butadiene Rubber) offers good resistance to petroleum-based oils, greases, and water, making it generally suitable for outdoor use in moderate conditions. However, NBR has limited resistance to ozone, UV exposure, and aggressive chemicals such as brake fluid or concentrated acids. For applications with prolonged UV or ozone exposure, an FKM (Viton) seal is typically recommended. The TC secondary dust lip also provides additional protection against water ingress.

This seal conforms to the metric R23 standard with a 24mm inner diameter. It is designed for metric-dimensioned shafts and housing bores — not imperial (inch) shafts. Installation is a press fit into the housing bore; no threads are involved. Always verify that your housing bore OD and depth match the selected variant. If you are replacing an OEM seal, cross-reference using the R23 designation and the three dimensions (ID × OD × Height).

The outer diameter (OD) must match your housing bore for a secure interference press fit — too small and the seal will leak; too large and it won't seat. The height (axial width) must fit within the available depth in your housing without bottoming out or protruding. Available ODs in this listing range from 32mm (≈1-1/4") to 43mm (≈1-11/16"), and heights from 4mm (≈5/32") to 10mm (≈3/8"). Always measure your housing before selecting a variant.

NBR seals are generally compatible with mineral-based gear oils (GL-4, GL-5), automatic transmission fluid (ATF), and most petroleum-based lubricants. Compatibility with fully synthetic gear oils (PAO or ester-based) varies — some formulations can cause NBR to swell or degrade over time. If you are using a fully synthetic lubricant, check the fluid manufacturer's elastomer compatibility data or contact us before ordering.

Select the pack quantity that fits your project. A single piece is ideal for a one-off repair. Packs of 5 or 10 are practical for servicing multiple units or keeping a spare on hand. Packs of 20–50 are suited to fleet maintenance programs or workshop stock where the same seal size is used across multiple machines. Larger packs offer a lower per-unit cost.