TC Oil Seal NBR + Metal Skeleton Rotary Shaft Sealing Ring — ID 26–50 mm

Measure three dimensions with calipers: the shaft diameter (this is your ID), the housing bore diameter (this is your OD), and the housing depth (this is your Height). Match all three to the variant listed. For example, a 30 mm shaft in a 47 mm bore with a 7 mm housing depth = select 30×47×7mm. If you only have inch measurements, multiply by 25.4 to convert — for instance, a 1.181" shaft is approximately 30 mm. When in doubt, measure the old seal directly.

A TC seal has two sealing lips: a primary lip that retains lubricant on the inboard side, and a secondary dust lip that prevents contaminants from entering from the outboard side. A single-lip (SC) seal has only the primary lip. TC seals are generally preferred for applications exposed to dirt, water spray, mud, or debris — such as wheel hubs, agricultural PTO shafts, and outdoor power equipment.

TC-type rotary shaft oil seals are designed for low-to-moderate pressure applications, typically up to about 0.05 MPa (≈7 psi) of differential pressure. They are not intended for high-pressure hydraulic circuits. For higher-pressure applications, a PTFE lip seal or spring-energized seal is generally more appropriate. These seals are well suited for gearbox splash lubrication, bearing grease retention, and similar low-pressure rotary sealing tasks.

Yes. NBR rubber generally offers good resistance to water, grease, and petroleum-based oils, and the TC double-lip design specifically adds a secondary dust exclusion lip for environments with dirt or moisture. The metal skeleton maintains the seal's shape under press-fit installation. For prolonged UV exposure, ozone-rich environments, or contact with aggressive chemicals, FKM (Viton) or EPDM materials are typically more suitable — contact us if you need an alternative compound.

For reliable sealing performance, the shaft surface in the sealing zone should generally be ground or polished to a surface roughness of Ra 0.2–0.8 µm (approximately 8–32 µin). A shaft hardness of HRC 45 or higher is typically recommended to minimize lip wear over time. Avoid sharp edges, keyways, or threads in the sealing zone — use a sleeve or installation tool to protect the lip when sliding the seal over these features.

NBR is generally compatible with mineral oils, petroleum-based greases, and many water-glycol fluids. It is typically not recommended for use with phosphate ester hydraulic fluids, ketones (such as MEK or acetone), or strong aromatic solvents. Compatibility with PAO-based synthetic oils and synthetic ester lubricants varies — if you are using a non-mineral lubricant, verify compatibility with the fluid manufacturer's data sheet before installation.

Apply a thin film of clean grease to the sealing lip and the shaft surface before installation. Use a seal driver sized to the OD, or a flat press plate, to push the seal in squarely — never strike the seal face directly with a hammer. Press until the outer face is flush with or slightly below the housing bore edge. If the shaft has a keyway, thread, or sharp shoulder, use a tapered installation sleeve or wrap the shaft with thin plastic film to protect the lip during assembly.