44mm Bore TC Oil Seal | Metric R23 NBR Rotary Shaft Seal | Multiple OD & Heights

Measure your shaft's outer diameter — this becomes the seal's inner diameter (ID). All seals in this listing have a 44mm ID. Next, measure your housing bore inner diameter (= seal OD) and the housing depth (= seal height). Match those two dimensions to the variant options above. For example, if your housing bore is 62mm and depth is 7mm, select 44 × 62 × 7mm. When in doubt, consult your equipment's service manual or contact us to confirm before ordering.

TC stands for a double-lip seal arrangement (also referred to as R23 in metric standards). The primary lip retains lubricant and excludes contaminants from the lubricated side, while the secondary dust lip provides an additional barrier against dirt, debris, and moisture ingress from the atmosphere side. TC seals are generally more effective than single-lip (SC) seals in environments with external contamination.

NBR (nitrile rubber) lip seals typically operate in a temperature range of approximately -40°F to +250°F (-40°C to +120°C) and are generally rated for low-to-moderate shaft speeds and pressures. For high-temperature applications (above 250°F) or aggressive chemical environments, FKM (Viton) alternatives may be more appropriate. Contact us to confirm suitability for your specific operating conditions.

NBR seals offer good resistance to petroleum-based oils, greases, and water splash. The TC double-lip design adds a secondary dust exclusion barrier, making these seals generally suitable for outdoor equipment exposed to moisture, mud, and light contamination — such as agricultural machinery and outdoor power equipment. For continuous submersion or exposure to aggressive chemicals, a different elastomer may be more appropriate.

Metric TC oil seals with NBR lips are typically rated for shaft surface speeds up to approximately 4–6 m/s (800–1,200 ft/min) under normal lubricated conditions. Actual limits depend on shaft surface finish (Ra typically 0.2–0.8 µm recommended), housing fit, and operating temperature. Consult your equipment specifications or contact us to confirm for your application.

44mm ID rotary shaft seals are commonly found in agricultural tractor gearboxes and PTO shafts, automotive differentials and manual transmissions, industrial gearbox input/output shafts, hydraulic pumps, electric motor end caps, and general power transmission equipment. Always verify the OD and height match your housing before ordering.

Clean the housing bore and shaft thoroughly. Lightly lubricate the seal lip with the fluid it will retain (gear oil, grease, etc.). Press the seal squarely into the housing using a seal driver or a flat plate — never hammer directly on the seal face. Ensure the primary lip faces the lubricant side (inward). Protect the lip from sharp edges, keyways, or splines during installation by using a sleeve or tape over the shaft end.

TC oil seals in this listing typically feature a steel outer case with a rubber-coated OD for a secure press fit. The rubber coating helps compensate for minor bore surface irregularities and provides a static seal against the housing. This construction is generally compatible with cast iron, steel, and aluminum housings. Contact us to confirm compatibility with your specific housing material if needed.