TC Oil Seal NBR Double Lip — Rotary Shaft Seal ID 56–60mm (Multiple OD & Thickness Options)

Measure the shaft inner diameter (ID), the bore outer diameter (OD), and the housing depth (thickness) — all three dimensions must match your application. For example, a 58 x 80 x 10mm seal fits a 58mm shaft, an 80mm housing bore, and a 10mm deep housing pocket (approximately 2.28" x 3.15" x 0.39"). Use calipers rather than relying on part numbers alone, as OEM numbers can vary by manufacturer.

TC refers to the seal construction standard: a metal skeleton (case) bonded to an NBR rubber body with two sealing lips. The primary lip faces inward to retain oil or grease; the secondary dust lip faces outward to block contaminants like dirt and water. This dual-lip design generally provides better protection than single-lip (SC) seals in dirty or wet environments such as agricultural equipment or outdoor machinery.

NBR (nitrile rubber) seals typically handle temperatures from approximately -40°F to +250°F (-40°C to +120°C) and are generally suited for low-to-moderate pressure applications. For high-temperature environments (above 250°F) or exposure to fuels and aromatic solvents, FKM (Viton) seals are generally a better choice.

Yes. NBR is broadly compatible with petroleum-based mineral oils, hydraulic fluids, and greases — the most common fluids in automotive, agricultural, and industrial gearboxes. NBR is not recommended for use with ketones, esters, or aromatic fuels. Always verify fluid compatibility with your specific application before installation.

The double-lip design provides a secondary barrier against water and dust ingress, making these seals suitable for many outdoor and wet-environment applications — including agricultural equipment, marine outdrives, and outdoor power tools. Prolonged submersion or exposure to salt water may accelerate wear over time. Confirm suitability for your specific conditions, especially in marine or high-wash-down environments.

For best results, the shaft surface in contact with the seal lip should generally have a finish of Ra 0.2–0.8 µm (approximately 8–32 µin). Rough or scored shafts cause premature lip wear and leakage. A shaft hardness of HRC 45 or higher is typically recommended at the contact area. If the shaft is worn or grooved, a shaft repair sleeve can restore the sealing surface without replacing the shaft.

Press the seal in squarely using a seal driver or a flat block that contacts the outer metal case — never strike the rubber lip directly. Lightly lubricate the seal lip with clean oil before installation to prevent dry-start damage. Ensure the housing bore is clean and free of burrs or sharp edges. The seal should sit flush or slightly below the housing face. Avoid cocking the seal during installation, as this can distort the lip and cause immediate leakage.