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When a worn or mismatched shaft seal causes oil leaks in your gearbox, pump, or motor, the damage compounds fast — contaminated lubricant, scored shafts, and costly downtime. Engineers, mechanics, and serious DIYers working on metric machinery need a seal that holds under heat, chemical exposure, and continuous rotation. This FKM fluorine rubber TC oil seal is built for exactly those conditions.
Each seal features a double-lip TC profile with a garter spring-loaded primary lip and a secondary dust exclusion lip. The sealing element is FKM (fluoroelastomer / Viton-equivalent) rubber bonded to a steel shell. Inner shaft diameters span 27–32mm (approximately 1.06–1.26 in), outer diameters 35–85mm (approximately 1.38–3.35 in), and seal depths 4–12mm (approximately 0.16–0.47 in). Each listing ships as a pack of 2 seals.
Typical applications include metric gearbox output shaft sealing, hydraulic pump shaft seals, electric motor end-cap sealing, and agricultural or industrial equipment shaft seals where petroleum oils, synthetic lubricants, or mild chemical exposure is present. Long-tail use cases: replacement TC oil seal for metric reducer, FKM double lip seal for CNC spindle, fluorine rubber rotary shaft seal for pump rebuild.
FKM Fluoroelastomer Lip Material — Withstands continuous operating temperatures typically ranging from −20°C to +200°C (−4°F to +392°F), resisting degradation from petroleum oils, synthetic lubricants, and mild chemical exposure far beyond standard NBR seals.
Double Lip TC Profile — The spring-loaded primary lip maintains consistent radial contact force against the rotating shaft to retain lubricant; the secondary lip excludes dust, dirt, and moisture from the inboard side, extending lubricant life.
Garter Spring Retention — An embedded garter spring applies uniform radial load around the primary sealing lip, compensating for minor shaft runout and housing misalignment to maintain a reliable seal over time.
Steel-Bonded Shell Construction — The outer metal case provides a firm interference fit in the housing bore, resisting rotation and blowout under pressure differentials typically encountered in gearboxes and pumps.
Wide Metric Size Coverage — Inner shaft diameters 27–32mm, outer diameters 35–85mm, depths 4–12mm — over 249 size combinations available in this series, reducing the need to source from multiple suppliers.
Sold in Packs of 2 — Each order includes 2 seals, providing a spare for future maintenance or allowing simultaneous replacement of paired seals on both ends of a shaft without a second order.
| Seal Type | TC (Double Lip with Garter Spring) |
|---|---|
| Lip Material | FKM (Fluoroelastomer / Viton-equivalent) |
| Shell Material | Steel (metal-bonded outer case) |
| Inner Diameter (Shaft) | 27–32 mm (approx. 1.06–1.26 in) |
| Outer Diameter (Housing Bore) | 35–85 mm (approx. 1.38–3.35 in) |
| Seal Depth / Width | 4–12 mm (approx. 0.16–0.47 in) |
| Packing Quantity | 2 pcs per pack |
| Dimension Standard | Metric (mm) |
| Operating Temperature Range | Typically −20°C to +200°C (−4°F to +392°F) |
| Compatible Fluids | Petroleum oils, synthetic gear oils, ATF, mild fuels |
| Spring Type | Garter spring (radial load) |
| Exact Size | See variant options |
| Max Shaft Speed | See variant options / Contact us to confirm |
| Pressure Rating | Contact us to confirm |
Measure three dimensions on your existing seal or housing: (1) the shaft outer diameter — this is the Inner Ø of the seal; (2) the housing bore diameter — this is the Outer Ø of the seal; (3) the depth of the seal groove or the seal width. Match all three to the variant listed as Inner Ø × Outer Ø × Depth (all in mm). If your existing seal is worn, measure the housing bore and shaft directly with calipers for accuracy.
A TC seal has two sealing lips: a primary spring-loaded lip that retains lubricant and a secondary lip that excludes contaminants. An SC seal has only a single lip. TC seals are preferred in environments with dust, moisture, or contamination risk — such as gearboxes, agricultural equipment, and outdoor machinery — because the secondary lip provides an additional barrier.
FKM (fluoroelastomer) offers significantly broader chemical and temperature resistance compared to NBR (nitrile rubber). FKM handles temperatures up to approximately +200°C and resists synthetic oils, fuels, and mild chemicals that would degrade NBR. NBR is adequate for standard petroleum oils at moderate temperatures. If your application involves synthetic lubricants, elevated heat, or chemical exposure, FKM is the more durable choice.
The garter spring in the TC profile compensates for minor shaft runout and slight housing misalignment by maintaining consistent radial contact force on the lip. However, these seals are designed for applications within normal engineering tolerances. Excessive runout (typically beyond 0.2–0.5mm TIR depending on shaft speed) can accelerate lip wear and reduce seal life. Correct any significant misalignment before installation for best results.
FKM is compatible with petroleum-based oils, synthetic gear oils, automatic transmission fluid (ATF), hydraulic oils, mild fuels (gasoline, diesel), and many aromatic hydrocarbons. FKM is generally not recommended for ketone-based fluids (MEK, acetone), certain ester-based lubricants, or hot steam without specific compound verification. If you are unsure about your fluid compatibility, contact us with the fluid specification.
Clean the housing bore and shaft thoroughly before installation. Lightly lubricate the seal lip with the same oil used in the application. Press the seal squarely into the housing bore using a flat press tool or a seal driver sized to the outer diameter — never strike the seal directly with a hammer. Ensure the seal is flush or slightly below the housing face as required by your application. Avoid dragging the lip over sharp shaft edges or keyways; use a lead-in chamfer or protective sleeve if needed.
Many shaft assemblies have seals at both ends (input and output), so replacing both simultaneously prevents a second disassembly shortly after. Having a spare also means you are prepared for future maintenance without waiting for reorder. For low-volume repair shops and serious DIYers, a 2-pack provides cost efficiency and operational readiness.
