Can these seals be used outdoors or in wet environments?

Yes. The TC double-lip design includes a secondary dust lip that helps exclude water, mud, and contaminants. FKM material is generally resistant to weathering and ozone, making it suitable for outdoor machinery and marine-adjacent applications.

TC Skeleton Oil Seal FKM Rotary Shaft Seal — ID 40mm to 50mm, Multiple Sizes

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TC Skeleton Oil Seal FKM Rotary Shaft Seal — ID 40mm to 50mm, Multiple Sizes

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Inner Diameter X Outer Diameter X Thickness: 40x60x8mm

Pack Quantity(Pcs): 1 Pcs

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$9.64 USD

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In stock (500 units), ready to be shipped

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TC Skeleton FKM Oil Seal for Rotary Shafts — Reliable Sealing for ID 40mm to 50mm Applications

When a worn or wrong-spec shaft seal lets oil weep past a gearbox, pump, or axle, the mess is the least of your problems — contaminated bearings and seized components follow fast. Mechanics, equipment owners, and DIY rebuilders who need a dependable TC skeleton oil seal with FKM (Viton) lips know that material quality and dimensional accuracy are non-negotiable.

Each seal in this listing is a TC-type double-lip rotary shaft seal with a carbon steel skeleton (spring-loaded inner casing) and FKM elastomer lips. Available in inner diameters from 40mm (≈1.575″) to 50mm (≈1.969″), outer diameters from 55mm to 80mm, and thicknesses of 7mm, 8mm, 10mm, or 12mm — choose your exact ID × OD × thickness combination from the variant selector. Sold individually (1 Pcs) or in a value 3-pack.

Typical use cases include gearbox output shaft sealing, hydraulic pump shaft seals, agricultural equipment axle seals, and small engine crankshaft seals — anywhere a metric rotary shaft seal with FKM chemical resistance is required.

ℹ️ Compatibility Note: These are metric TC-type seals. Verify your shaft ID, housing bore OD, and housing depth before ordering. Dimensions are listed as Inner Diameter × Outer Diameter × Thickness in millimeters.

✅ Key Features of These TC FKM Rotary Shaft Oil Seals

🔩TC Double-Lip Design — The primary lip retains oil and grease; the secondary dust lip blocks dirt, water, and debris from entering the bearing cavity.
🧪FKM (Viton) Elastomer Lips — Resists petroleum oils, hydraulic fluids, gear oils, and many solvents; generally rated to approximately +200°C (+392°F) continuous service.
🏗️Carbon Steel Skeleton with Garter Spring — The metal casing maintains dimensional stability in the bore; the internal garter spring keeps consistent radial lip pressure on the shaft.
📐Wide Size Matrix — ID 40–50mm, OD 55–80mm, thickness 7–12mm; over 100 size combinations available in this listing to match your exact metric rotary shaft seal requirement.
⚙️Drop-In Replacement Fit — Follows standard metric TC seal dimensions, making these suitable as direct replacements for OEM seals in gearboxes, pumps, and agricultural machinery.
📦Single or 3-Pack Options — Order one for an immediate repair or grab a 3-pack for a lower per-unit cost and a spare on the shelf for next time.

📐 Technical Specifications — TC FKM Rotary Shaft Oil Seal

Seal Type	TC (Double Lip, Spring-Loaded)
Lip Material	FKM (Fluoroelastomer / Viton)
Skeleton / Casing	Carbon Steel
Inner Diameter (ID) Range	40mm (≈1.575″) – 50mm (≈1.969″)
Outer Diameter (OD) Range	55mm (≈2.165″) – 80mm (≈3.150″)
Thickness Range	7mm (≈0.276″) – 12mm (≈0.472″)
Operating Temperature (typical)	Approximately -20°C to +200°C (-4°F to +392°F)
Fluid Compatibility	Petroleum oils, gear oils, hydraulic fluids, greases — see variant options
Max Shaft Speed (typical)	Generally up to 4–6 m/s surface speed; contact us to confirm
Max Pressure (typical)	Generally under 0.05 MPa (7 psi); not for high-pressure applications
Pack Quantity	1 Pcs or 3 Pcs (select above)
Dimension Format	ID × OD × Thickness (mm)
Country of Origin	See variant options

⚠️ Before You Order: Measure your shaft diameter (ID), housing bore (OD), and housing depth (thickness) with calipers. A seal that is even 1mm off in any dimension will not seal correctly.

❓ Frequently Asked Questions

How do I choose the right TC oil seal size?

Measure three dimensions with calipers: the shaft inner diameter (ID), the housing bore outer diameter (OD), and the housing depth (thickness). Match all three to the variant listed. For example, 40×60×8mm means ID 40mm (≈1.575″), OD 60mm (≈2.362″), thickness 8mm (≈0.315″). When replacing an existing seal, the old seal's stamped dimensions are usually the fastest reference.

What does FKM mean and why does it matter for oil seals?

FKM (also marketed as Viton) is a fluoroelastomer that generally withstands temperatures from about -20°C to +200°C (-4°F to +392°F) and resists petroleum oils, hydraulic fluids, gear oils, and many chemicals far better than standard NBR (nitrile) rubber seals. If your application runs hot or uses synthetic fluids, FKM is typically the correct choice.

Can these seals be used outdoors or in wet/muddy environments?

Yes. The TC double-lip design includes a secondary dust lip that helps exclude water, mud, and contaminants from the bearing side. FKM material is generally resistant to weathering and ozone, making it suitable for outdoor machinery, agricultural equipment, and marine-adjacent applications.

What shaft speed and pressure can these seals handle?

TC rotary shaft seals are typically rated for low-to-moderate shaft speeds — generally up to 4–6 m/s surface speed — and low differential pressures (typically under 0.05 MPa / 7 psi). They are not designed for high-pressure hydraulic circuits. If your application involves higher speeds or pressures, contact us to confirm suitability before ordering.

Are these seals compatible with metric shafts and housings?

Yes. All dimensions follow metric standards (millimeters). They are designed to fit metric shafts and bores. If your equipment uses inch dimensions, convert carefully — for example, a 40mm ID is approximately 1.575″ and a 50mm ID is approximately 1.969″. Use calipers rather than relying on nominal inch sizes.

What is the difference between the 1 Pcs and 3 Pcs pack options?

Both packs contain the same seal in the same size. The 3 Pcs pack offers a lower per-unit cost and is practical when you need a spare on hand or are servicing multiple units at once. The price per seal is lower in the 3-pack.

How do I install a TC skeleton oil seal correctly?

Clean the housing bore and shaft journal. Lightly lubricate the seal lip with the fluid being sealed (oil or grease). Press the seal squarely into the bore using a seal driver or a flat block — never hammer directly on the seal face or casing. Ensure the primary lip (spring side) faces the fluid/oil side of the assembly. Avoid nicking the lip on shaft keyways or splines during installation.

🛒 Select your size (ID × OD × thickness) and pack quantity above, then add to cart — ships from our US warehouse.

TC Skeleton Oil Seal FKM Rotary Shaft Seal — ID 40mm to 50mm, Multiple Sizes

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TC Skeleton FKM Oil Seal for Rotary Shafts — Reliable Sealing for ID 40mm to 50mm Applications

✅ Key Features of These TC FKM Rotary Shaft Oil Seals

📐 Technical Specifications — TC FKM Rotary Shaft Oil Seal

❓ Frequently Asked Questions

TC Skeleton Oil Seal FKM Rotary Shaft Seal — ID 40mm to 50mm, Multiple Sizes

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