TC FKM Double Lip Oil Seal — Stop Leaks on Rotary Shafts from 25mm to 40mm
If you've dealt with grease leaking past a worn shaft seal — or grit working its way into a gearbox, pump, or axle housing — you know how quickly a small seal failure turns into a costly repair. Mechanics, equipment rebuilders, and serious DIYers working on agricultural machinery, industrial drives, and automotive differentials need a seal that holds up to heat, oil, and contamination without constant replacement.
Each listing covers TC skeleton oil seals with an FKM (Viton) double-lip design and a carbon steel case. The Inner Diameter (ID) ranges from 25mm (≈0.984") to 40mm (≈1.575"), with Outer Diameters (OD) from 36mm to 90mm and thickness options from 4mm to 12mm — available in 1 PCS or 2 PCS packs. Select your exact ID × OD × Thickness combination from the variant dropdown above.
Typical use cases include gearbox output shaft sealing, hydraulic pump shaft seals, agricultural PTO shaft seals, and electric motor end-cap sealing — anywhere a metric rotary shaft seal with FKM lip material is specified.
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Compatibility Note: These are metric TC-type radial shaft seals. Match the seal ID to your shaft diameter and the OD to your housing bore. Sizes follow general ISO 6194-1 conventions. If your equipment uses inch-standard seals, please verify metric equivalents before ordering.
✅ Key Features of These TC FKM Double Lip Oil Seals
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FKM (Viton) Lip Material — Resists petroleum oils, synthetic lubricants, and elevated temperatures typically up to 200°C (392°F), outperforming standard NBR seals in demanding rotary shaft applications.
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TC Double-Lip Design with Garter Spring — The primary spring-loaded lip maintains consistent radial contact force against the shaft, while the secondary dust lip blocks contaminants — a standard configuration for gearbox and pump shaft sealing.
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Wide Size Selection — ID 25–40mm with OD options from 36mm to 90mm and thickness from 4mm to 12mm, covering a broad range of metric shaft seal replacements across industrial and automotive equipment.
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Carbon Steel Skeleton Case — The rigid metal outer case provides a secure press-fit into the housing bore, maintaining concentricity and preventing the seal from rotating or walking out under operating conditions.
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Drop-In Replacement Geometry — Dimensioned to ISO 6194-1 TC-type conventions, making these seals straightforward replacements for OEM metric shaft seals in agricultural machinery, industrial drives, and light automotive differentials.
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1 PCS or 2 PCS Pack Options — Order a single seal for a one-off repair or a 2-pack to keep a spare on hand — useful for equipment with multiple identical seal positions or for scheduled maintenance kits.
📐 Technical Specifications — TC Rotary Shaft Oil Seal
| Seal Type |
TC (Double Lip with Garter Spring) |
| Lip Material |
FKM (Fluoroelastomer / Viton) |
| Case Material |
Carbon Steel (Skeleton) |
| Inner Diameter (ID) Range |
25mm (≈0.984") – 40mm (≈1.575") |
| Outer Diameter (OD) Range |
36mm – 90mm (see variant options) |
| Thickness Range |
4mm – 12mm (see variant options) |
| Temperature Range |
Typically –20°C to +200°C (–4°F to +392°F) |
| Max Shaft Speed |
Generally up to 4–6 m/s (contact us to confirm for your application) |
| Max Differential Pressure |
Typically ≤ 0.3 bar (4.4 psi) |
| Compatible Fluids |
Petroleum oils, synthetic lubricants, greases (FKM-compatible) |
| Dimensional Standard |
ISO 6194-1 TC-type (metric) |
| Pack Quantity |
1 PCS or 2 PCS (select above) |
| Country of Origin |
Contact us to confirm |
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Size Tip: The variant label format is ID × OD × Thickness (e.g., "38 x 56 x 8mm"). Always measure your shaft diameter (ID), housing bore (OD), and groove depth (Thickness) before selecting a variant. If you're unsure, contact us with your equipment make/model.
❓ Frequently Asked Questions
How do I choose the right TC oil seal size?
Match the Inner Diameter (ID) to your shaft diameter exactly — this is the most critical measurement. The Outer Diameter (OD) must match your housing bore for a proper press-fit, and the thickness must fit the groove or housing depth. For example, a 30mm shaft typically requires a seal with ID 30mm. Always measure with calipers rather than relying on worn part markings. If you're replacing an existing seal, the size is usually stamped on the seal face or case.
What does 'TC' mean, and how is it different from SC or SB seals?
TC denotes a double-lip seal with a garter spring on the primary lip. The spring maintains consistent sealing pressure as the lip wears. SC seals have a single lip with a spring; SB seals have a single lip without a spring. TC is generally the most common choice for oil retention in gearboxes, pumps, and axles because the secondary lip also blocks dust and debris.
What pressure and load can these seals handle?
TC radial shaft seals are designed for low-pressure applications — typically up to 0.3 bar (≈4.4 psi) of differential pressure. They are not suitable for high-pressure hydraulic circuits. For shaft loads, the seal itself does not carry radial load; it relies on the bearing to support the shaft. Excessive shaft runout or misalignment will accelerate lip wear.
Are these seals suitable for outdoor or wet environments?
FKM lip material generally offers good resistance to water, humidity, and many common chemicals, making these seals suitable for outdoor and wet-environment use in most cases. The carbon steel case may develop surface rust in highly corrosive or salt-spray environments over extended periods. For marine or heavily corrosive applications, a stainless-cased variant is typically recommended — contact us if you need guidance.
What shaft surface speed is compatible with these seals?
FKM TC oil seals are generally rated for shaft surface speeds up to approximately 4–6 m/s under normal lubricated conditions. Actual limits depend on the specific size, shaft surface finish (Ra 0.2–0.8 µm is typically recommended), and operating temperature. For high-speed spindle or turbine applications, contact us to confirm suitability before ordering.
What thread or interface standard do these seals use?
These are metric radial shaft seals — no threading is involved. The Outer Diameter creates an interference press-fit with the housing bore, following general ISO 6194-1 TC-type dimensional conventions. They are not compatible with pipe threads or NPT fittings. If your equipment uses inch-standard seals, verify the metric equivalent dimensions before ordering.
How do I install a TC oil seal without damaging it?
Clean the housing bore and shaft thoroughly. Lightly coat the seal lip with the lubricant being sealed (oil or grease). Use a seal driver or a flat plate slightly smaller than the OD to press the seal in squarely — never strike the seal face directly with a hammer. The seal should sit flush with or slightly below the housing face. Chamfer or tape any shaft keyways or splines to avoid cutting the lip during installation.
🛒 Select your size (ID × OD × Thickness) and pack quantity above, then add to cart — ships from our US warehouse.
