You need three measurements: the shaft diameter (this becomes the ID), the housing bore diameter (this becomes the OD), and the housing depth (this becomes the thickness). For example, if your shaft is 70mm, your bore is 95mm, and your housing is 8mm deep, you need a 70x95x8mm seal. In inches: 70mm is approximately 2.756 inches, 95mm is approximately 3.740 inches, 8mm is approximately 0.315 inches. Always measure with calipers rather than relying on worn or corroded part markings.

TC indicates a double-lip seal design. The inner primary lip seals against the rotating shaft to retain lubricant, while the outer secondary lip faces away from the oil side to exclude dust, dirt, and moisture. This dual-barrier construction is generally more effective than single-lip (SC) seals in environments with contamination exposure, making TC seals a common choice for agricultural and industrial rotary shaft applications.

NBR generally performs in a temperature range of approximately -40F to +250F (-40C to +120C). Shaft surface speeds are typically suitable up to about 4 to 6 m/s, though this varies with shaft finish quality, lubricant viscosity, and operating pressure. For high-speed spindles or elevated-temperature environments, contact us to confirm suitability before ordering.

NBR provides good resistance to water, petroleum oils, and common greases. The TC double-lip design adds an outer dust lip that helps exclude moisture and debris — a key reason TC seals are widely used on agricultural equipment, trailers, and outdoor machinery. For highly corrosive chemical environments or prolonged immersion, a Viton (FKM) seal may be more appropriate. Contact us to confirm compatibility with your specific conditions.

NBR is generally compatible with petroleum-based engine oils, gear oils, hydraulic fluids, and greases. It is typically not recommended for use with phosphate ester hydraulic fluids, ketones, strong acids, or aromatic hydrocarbons. When in doubt, verify chemical compatibility with your specific lubricant data sheet before installation.

Clean the housing bore and shaft thoroughly. Lightly coat the seal lip with the same lubricant used in the application. Press the seal squarely into the bore using a seal driver or flat plate — never strike the seal face directly with a hammer. The seal should sit flush or slightly below the housing face. Ensure the shaft surface finish is smooth (typically Ra 0.2 to 0.8 micrometers) to prevent premature lip wear. Avoid dragging the seal lip over sharp keyways or threads during installation.

Yes — TC-type NBR rotary shaft oil seals are commonly used in agricultural machinery, tractor axles, gearbox output shafts, pump shafts, and general industrial power transmission equipment. Verify that the ID, OD, and thickness match your equipment specifications exactly before ordering. For critical or high-load applications, confirm suitability with your equipment manufacturer or service manual.

The internal garter spring wraps around the primary sealing lip and applies consistent inward radial pressure against the shaft surface. This spring loading compensates for minor lip wear over time and helps maintain an effective seal even as the NBR material ages. Springless seals rely entirely on the elasticity of the rubber, which can diminish faster under heat and wear cycles.