Brown fluororubber skeleton oil seal 200mm to 520mm Shaft TC Seal Ring FKM 70

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Sale price$17.88 USD
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In stock (500 units), ready to be shipped

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Description

Brown FKM TC Oil Seal — Fluororubber Shaft Sealing for Demanding Environments

Leaking shaft seals are a costly headache for mechanics, equipment rebuilders, and industrial maintenance teams. Whether you are rebuilding a gearbox, servicing a hydraulic pump, or replacing a worn crankshaft seal, finding the right brown FKM TC oil seal in the exact bore size can be frustrating. This listing covers a comprehensive range of fluororubber skeleton oil seals from 200mm to 520mm inner diameter, giving engineers and DIYers a single source for hard-to-find metric shaft seal sizes.

Each seal is constructed with a brown fluororubber (FKM, Shore 70A) elastomer bonded to a carbon steel skeleton, forming a double-lip TC profile. Inner diameters span 200mm to 520mm, outer diameters range from 220mm to 560mm, and depth (width) options run from 10mm to 25mm (approximately 0.39 in to 0.98 in). The sealing lip is factory-lubricated and features a garter spring for consistent radial load against the shaft.

Typical applications include industrial gearbox output shaft sealing, heavy-duty hydraulic cylinder rod seals, agricultural machinery axle seals, and marine drive shaft sealing where resistance to fuel, oil, and elevated temperatures is required. The FKM compound is well-suited for use with petroleum-based oils, synthetic lubricants, and many chemical media, making these TC seal rings a reliable choice for long-interval maintenance schedules.

⚙️ Compatibility: Suitable for rotating shafts in gearboxes, pumps, axles, and hydraulic equipment where the shaft diameter matches the selected Inner Ø. Always verify housing bore (Outer Ø) and seal groove depth before ordering.

✅ Key Features of These Brown FKM TC Oil Seals

🟤 FKM 70 Fluororubber Compound — Brown fluororubber elastomer (Shore 70A hardness) delivers broad chemical resistance to petroleum oils, synthetic lubricants, fuels, and many solvents, outperforming standard NBR seals in high-temperature service.
🔩 Double-Lip TC Profile with Garter Spring — The TC (twin contact) design features a primary sealing lip backed by a garter spring for consistent radial force, plus a secondary dust-exclusion lip to keep contaminants out of the bearing cavity.
📐 Wide Size Range: 200mm–520mm ID — 108 size variants covering inner diameters from 200mm to 520mm (approx. 7.87 in to 20.47 in) and depths from 10mm to 25mm, making it straightforward to find the correct replacement for large-bore industrial shafts.
🏗️ Carbon Steel Skeleton Construction — The rigid metal skeleton maintains dimensional stability under press-fit installation and prevents the seal from distorting under housing clamping loads, ensuring a leak-free static OD seal.
🌡️ Elevated Temperature Resistance — FKM compound is rated for continuous service up to approximately 200°C (392°F), making these seals suitable for high-speed gearboxes and equipment operating in hot ambient conditions.
🔄 Direct OEM Replacement Sizing — Dimensions follow standard metric shaft seal conventions (Inner Ø × Outer Ø × Depth in mm), allowing direct cross-reference to OEM part numbers for agricultural, industrial, and marine equipment.

📐 Technical Specifications — TC Oil Seal

Seal Type TC (Double Lip with Garter Spring)
Material FKM (Fluororubber / Viton-type), Shore 70A
Color Brown
Skeleton Carbon Steel
Inner Diameter (ID) 200mm – 520mm (7.87 in – 20.47 in)
Outer Diameter (OD) See variant options
Depth / Width 10mm – 25mm (0.39 in – 0.98 in)
Operating Temperature Typically –20°C to +200°C (–4°F to +392°F)
Media Compatibility Petroleum oils, synthetic lubricants, fuels, many chemicals
Shaft Speed See variant options
Pressure Rating Low-pressure / atmospheric (standard rotary shaft seal)
Quantity per Pack 1 piece

❓ Frequently Asked Questions

How do I choose the correct size TC oil seal?

Measure three dimensions on your existing seal or housing: Inner Diameter (ID) — the shaft diameter the seal rides on; Outer Diameter (OD) — the bore in the housing the seal presses into; and Depth (Width) — the axial thickness of the seal. Match all three to the variant listed as Inner Ø × Outer Ø × Depth. If the old seal is worn, measure the shaft and housing bore directly with calipers.

What is the difference between FKM and NBR oil seals?

NBR (nitrile) seals are suitable for standard petroleum oils at moderate temperatures (up to approximately 120°C). FKM (fluororubber) seals handle a wider range of chemicals, fuels, and synthetic lubricants, and maintain their properties at higher continuous temperatures (up to approximately 200°C). If your application involves synthetic gear oils, biodiesel blends, or elevated operating temperatures, FKM is the more durable choice.

What does the TC profile mean, and why does it matter?

TC stands for Twin Contact — the seal has two lips. The primary lip, backed by a garter spring, maintains consistent contact with the rotating shaft to retain lubricant. The secondary lip faces outward to exclude dust, dirt, and moisture. This dual-lip design makes TC seals the standard choice for gearboxes and axles exposed to contaminated environments.

Are these seals compatible with synthetic gear oil?

Yes. FKM fluororubber has good compatibility with most synthetic gear oils, including PAO (polyalphaolefin) and ester-based lubricants. It also resists ATF (automatic transmission fluid) and many hydraulic fluids. For unusual or proprietary fluid formulations, verify compatibility with the fluid manufacturer's seal compatibility data.

How do I install a large-bore TC oil seal correctly?

Clean the housing bore and shaft thoroughly. Lightly lubricate the seal lip with the same oil used in the application. Use a seal driver or a flat press plate slightly smaller than the OD to press the seal in squarely — never hammer directly on the seal face. Press until the seal face is flush with or just below the housing surface. Protect the seal lip from sharp shaft edges by using a sleeve or tape during installation.

Can I use these seals on a stationary (static) application?

TC oil seals are designed primarily for rotating shaft (dynamic) applications. While the press-fit OD provides a static seal against the housing bore, the lip geometry is optimized for rotary motion. For purely static sealing (no shaft rotation), an O-ring or gasket is typically more appropriate. These seals perform best when the shaft rotates within the specified speed range.

What shaft surface finish is recommended for FKM TC seals?

For reliable sealing, the shaft surface in the seal contact zone should have a finish of approximately Ra 0.2–0.8 µm (8–32 µin) with a lead-free ground finish. Avoid longitudinal scratches or machining marks that run parallel to the shaft axis, as these can create leak paths. A hardness of 45–60 HRC in the contact zone extends seal life significantly.

🛒 Select your Inner Ø x Outer Ø x Depth above, then add to cart.

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