TC Skeleton Oil Seals — Double Lip FKM Fluororubber, ID 8–100mm, Height 5–8mm

Measure the shaft diameter (ID), the bore diameter (OD), and the housing depth (height) with calipers. Match all three dimensions to the variant listed as ID x OD x Height. For example, a 25mm shaft with a 40mm bore and 7mm housing depth needs a 25 x 40 x 7mm seal. If you only have inch measurements, multiply by 25.4 to convert — e.g., a 1" shaft ≈ 25.4mm ID, and a 1.575" bore ≈ 40mm OD.

FKM (Viton-type) fluororubber seals generally handle continuous operating temperatures from approximately -20°C (-4°F) to +200°C (+392°F). This makes them suitable for high-heat applications such as engines, gearboxes, and industrial machinery where standard NBR seals would degrade prematurely.

Yes. The double-lip design provides an extra sealing barrier that helps exclude water, dust, and contaminants. FKM material is inherently resistant to weathering and ozone, making these seals suitable for outdoor equipment, agricultural machinery, and marine-adjacent applications. In most cases, the secondary dust lip provides meaningful protection against mud and water ingress.

FKM fluororubber is generally compatible with petroleum-based oils, synthetic lubricants, hydraulic fluids, fuels, and many aggressive chemicals. It is typically not recommended for use with ketones (e.g., MEK, acetone), certain esters, or steam above its rated temperature. Always confirm compatibility with your specific fluid before installation.

A single-lip seal retains lubricant on one side only. A TC double-lip seal adds a secondary dust lip that faces outward, preventing contaminants like dirt, water, and debris from reaching the primary sealing lip. This makes TC seals the preferred choice for environments with external contamination — such as agricultural equipment, off-road vehicles, and outdoor industrial machinery.

Clean the housing bore and shaft. Lightly lubricate the seal lip with the fluid being sealed. Press the seal squarely into the bore using a seal driver or a flat plate — never hammer directly on the seal face. Ensure the seal sits flush or slightly below the housing surface. Check the shaft surface finish; a rough or scored shaft will damage the lip and cause premature leakage. In most cases, a shaft finish of Ra 0.2–0.8 μm is recommended.

For optimal sealing performance, the shaft surface finish is typically recommended to be in the range of Ra 0.2–0.8 μm (approximately 8–32 μin). Surfaces that are too rough will accelerate lip wear; surfaces that are too smooth may not retain the thin oil film needed to lubricate the seal lip. If the shaft is worn or scored, consider using a shaft repair sleeve before installing a new seal.