TC Oil Seal Nitrile Rotary Shaft Seal Double Lipped I.D 24mm 25mm 28mm 30mm 32mm

Measure three dimensions on your existing seal or shaft housing: the shaft inner diameter (ID), the housing bore outer diameter (OD), and the seal width (thickness). All three must match the replacement seal. If the old seal is damaged, measure the shaft journal diameter directly and the housing bore with calipers. Cross-reference those measurements with the variant options listed on this page.

"TC" is a standard designation for a double-lip rotary shaft seal with a metal case. The primary lip faces inward to retain lubricant, while the secondary lip faces outward to exclude dust and moisture. This distinguishes it from single-lip "SC" seals, which only retain oil without a dedicated dust barrier.

NBR is compatible with petroleum-based engine oils, gear oils, ATF, and most hydraulic fluids. It performs reliably from −40 °C to approximately +120 °C. If your application involves synthetic esters, phosphate-ester hydraulic fluids, or sustained temperatures above 120 °C, a Viton (FKM) seal would be more appropriate. For standard automotive and agricultural equipment using conventional lubricants, NBR is the standard choice.

Clean the housing bore and lightly lubricate the outer case with clean oil or assembly grease. Use a flat-faced driver or a socket slightly smaller than the OD to press the seal in squarely — never hammer directly on the rubber lip. Press until the seal face is flush with or just below the housing surface. Lightly coat the sealing lip with the lubricant it will be retaining before fitting over the shaft.

Yes. The secondary dust lip on a TC seal is specifically designed to exclude water splash, mud, and airborne particles. NBR also has adequate resistance to water and mild weather exposure. For fully submerged or high-pressure wash-down environments, verify the specific application requirements, as TC seals are designed for dynamic shaft rotation rather than static pressure containment.

Common causes include: incorrect size (ID too large causes lip under-tension; OD too small causes the seal to spin in the bore), shaft surface roughness or scoring that cuts the lip, misalignment between shaft and housing centerlines, excessive shaft runout, operating temperatures outside the NBR range, and incompatible fluid chemistry. Always inspect and polish the shaft journal before fitting a new seal.

TC nitrile seals are rated for typical rotary shaft speeds found in automotive drivetrains, agricultural equipment, and general industrial machinery — generally up to approximately 4–8 m/s shaft surface speed depending on shaft diameter and lubrication. For very high-speed spindles or precision machine tool applications, consult the equipment manufacturer's seal specification for the required lip material and surface speed rating.