Measure three dimensions with calipers: the shaft inner diameter (ID), the housing bore outer diameter (OD), and the housing depth (height). All seals in this listing have an 8mm ID. Select the OD and height variant that matches your housing. For example, if your bore is 16mm wide and 5mm deep, choose the 8 x 16 x 5 mm variant. When in doubt, consult your equipment service manual or contact us to confirm.

TC-type seals feature two sealing lips: a primary lip that retains lubricant inside the housing, and a secondary dust lip that blocks contaminants — dirt, water, and debris — from entering. This dual-lip design generally provides better protection than single-lip (SC-type) seals in environments where external contamination is a concern, such as outdoor equipment or dusty workshops.

NBR (nitrile rubber) seals typically handle temperatures from approximately -40°F to +250°F (-40°C to +120°C). They are suited for low-to-moderate pressure rotary shaft applications. For high-temperature environments above 250°F or exposure to aggressive chemicals like ketones or strong acids, consider FKM (Viton) seals instead.

NBR offers good resistance to water, petroleum-based oils, and mild weather exposure. The secondary dust lip on TC-type seals adds a layer of protection against moisture ingress. In most cases, these seals perform well in outdoor power equipment such as lawn mowers, tillers, and generators, but inspect them periodically in harsh or saltwater environments as NBR is generally not recommended for prolonged UV or ozone exposure.

TC skeleton oil seals are designed for rotary shaft applications. Acceptable surface speed depends on the specific OD, lip geometry, lubrication, and shaft finish. In most cases, these seals are suitable for the low-to-medium shaft speeds found in electric motors, small gearboxes, and pumps. If your application involves high-speed shafts, contact us to confirm compatibility before ordering.

Yes. All dimensions are in metric (mm). The 8mm ID is a standard metric shaft size used widely in motors, gearboxes, and small machinery conforming to ISO and DIN standards. Verify that the OD and height match your specific housing bore before ordering — metric sizing is not interchangeable with imperial equivalents without careful conversion.

Oil seals are consumable maintenance parts — they wear over time and should be replaced during routine service intervals. A 20-pack is practical for workshops, fleet maintenance operations, or anyone servicing multiple machines with 8mm shafts. Having spares on hand eliminates downtime waiting for a single replacement seal to arrive when a machine needs immediate repair.

Clean the housing bore and shaft thoroughly before installation. Apply a thin film of clean oil or grease to the seal lips and the outer diameter. Press the seal in squarely using a seal driver or a flat block — never tap one side only, as this can distort the steel skeleton. The seal face should sit flush with or slightly below the housing surface. Avoid nicking the primary lip on shaft keyways or threads during installation.