TC Oil Seal FKM Double Lip Rotary Shaft Seal ID 45–50mm

TC Skeleton Oil Seal FKM Double Lip Rotary Shaft Seal — ID 45mm to 50mm

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TC Skeleton Oil Seal FKM Double Lip — Stop Leaks on Rotating Shafts

When a worn or wrong-sized shaft seal lets oil weep past a gearbox output, pump housing, or motor end cap, the mess is the least of your problems — contamination and dry-running damage follow fast. These TC skeleton oil seals with FKM double lip are sized for the 45–50mm inner diameter range and are built for mechanics, equipment rebuilders, and serious DIYers who need a reliable replacement without hunting through a dealer's parts catalog.

Each seal is a single-piece TC (double-lip) design with a steel skeleton for press-fit rigidity. The sealing element is FKM (fluoroelastomer), rated for continuous service up to approximately 200°C (392°F). Available sizes span an inner diameter of 45mm (≈1.77") to 50mm (≈1.97"), outer diameters from 55mm (≈2.17") to 80mm (≈3.15"), and thicknesses of 7mm (≈0.28"), 8mm (≈0.31"), 10mm (≈0.39"), or 12mm (≈0.47") — select the exact ID×OD×Thickness combination that matches your housing bore and shaft.

Typical use cases include replacing leaking output shaft seals on automotive manual gearboxes and differentials, resealing hydraulic pump shafts on compact tractors and skid steers, and servicing electric motor shaft ends in industrial equipment — all applications where a double-lip FKM rotary shaft seal for 45–50mm shafts is the correct specification.

ℹ️ Compatibility note: These seals follow standard metric TC dimensions. Verify your shaft ID, housing bore OD, and cavity depth before ordering. Sizes listed as ID×OD×Thickness (mm). See variant selector above for all available combinations.

✅ Key Features of These TC FKM Double Lip Rotary Shaft Seals

🔥FKM Fluoroelastomer Lip — Resists petroleum oils, synthetic gear oils, ATF, and heat up to approximately 200°C (392°F), outperforming standard NBR seals in high-temperature gearbox and pump applications.
🔩Steel Skeleton Construction — The rigid metal insert maintains a round, press-fit profile in the housing bore, preventing the seal from walking out under vibration or pressure pulses common in rotating shaft assemblies.
💧TC Double Lip Design — The primary lip retains lubricant; the secondary dust lip blocks contaminants from entering the bearing cavity — a critical feature for off-road equipment and outdoor machinery exposed to dirt and moisture.
📐Wide Size Matrix — ID 45–50mm — With OD options from 55mm to 80mm and four thickness choices (7, 8, 10, 12mm), this listing covers a broad range of metric shaft seal replacements without needing to source from multiple suppliers.
⚙️Low-Friction Sealing Geometry — The lip profile is engineered to maintain consistent radial load on the shaft, reducing heat generation at the contact zone — important for high-speed applications like motor output shafts and pump drives.
🚚Ships from US Warehouse — Stocked domestically for faster delivery compared to overseas-only suppliers, so your repair doesn't sit waiting on a slow freight shipment.

📐 Technical Specifications — TC FKM Double Lip Oil Seal

Seal Type	TC (Double Lip, Spring-Loaded Primary Lip)
Lip Material	FKM (Fluoroelastomer / Viton-type)
Skeleton Material	Carbon steel (metal-cased)
Inner Diameter (ID)	45mm (≈1.77") to 50mm (≈1.97") — see variant options
Outer Diameter (OD)	55mm (≈2.17") to 80mm (≈3.15") — see variant options
Thickness	7mm (≈0.28"), 8mm (≈0.31"), 10mm (≈0.39"), 12mm (≈0.47") — see variant options
Temperature Range	Typically −40°C to +200°C (−40°F to +392°F) for FKM compound
Max Shaft Speed	Typically up to 4–12 m/s peripheral speed (application-dependent)
Max Differential Pressure	Typically ≤ 0.3 bar (4.4 psi) — low-pressure dynamic sealing
Fluid Compatibility	Mineral oils, synthetic gear oils, ATF, hydraulic fluids — contact us to confirm specialty fluids
Finish / Color	Black lip, metallic skeleton
Quantity per Order	1 piece per variant (see Quantity option)
Standard	Metric TC dimensions (ISO / DIN style)
Country of Origin	Contact us to confirm

⚠️ Size confirmation: Always measure your shaft OD (= seal ID), housing bore ID (= seal OD), and cavity depth (= seal thickness) before ordering. A seal that is even 0.5mm off in OD will not press-fit correctly and may leak or fall out.

❓ Frequently Asked Questions

How do I choose the right size TC oil seal?

Measure three dimensions: the shaft diameter (this becomes the seal's inner diameter / ID), the bore diameter in the housing (this becomes the seal's outer diameter / OD), and the depth of the seal cavity (this is the thickness). All three must match. For example, a 45×60×10mm seal has an ID of 45mm (≈1.77"), OD of 60mm (≈2.36"), and thickness of 10mm (≈0.39"). When in doubt, measure twice before ordering — a seal that is even 0.5mm off in OD will not press-fit correctly.

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

FKM (fluoroelastomer, also marketed as Viton) is a synthetic rubber that generally offers superior resistance to heat, petroleum-based oils, hydraulic fluids, and many chemicals compared to standard NBR (nitrile) seals. FKM is typically rated for continuous service up to around 200°C (392°F), making it a common choice for high-temperature gearboxes, pumps, and engine applications where an NBR seal would harden and crack prematurely.

What pressure and load can these rotary shaft seals handle?

TC-type rotary shaft seals are designed for low-pressure dynamic sealing — typically up to about 0.3 bar (4.4 psi) of differential pressure. They are not intended for high-pressure hydraulic circuits. For higher-pressure applications, a different seal type (such as a lip seal with a backup ring or a mechanical face seal) is generally required.

Can these seals be used outdoors or in wet, dirty environments?

The FKM lip material generally provides good resistance to moisture, weathering, and ozone. The TC double-lip design specifically adds a secondary dust lip to block contaminants — making it more suitable for outdoor and off-road equipment than a single-lip seal. The steel skeleton can develop surface rust if the housing bore is exposed to standing water over long periods; applying a thin film of grease to the OD before installation helps protect the press-fit interface.

Are these FKM seals compatible with synthetic gear oil and ATF?

FKM seals are generally compatible with most mineral-based and synthetic gear oils, automatic transmission fluids (ATF), and many hydraulic fluids. They typically outperform NBR seals when exposed to high-ester synthetic oils or fluids with aggressive additive packages. If you are using a specialty fluid (e.g., certain biodegradable hydraulic oils or brake fluids), verify compatibility with the FKM compound before installation.

What shaft surface finish and speed are recommended for best seal life?

For best seal life, the shaft running surface should generally have a finish of Ra 0.2–0.8 μm (8–32 μin) and be free of spiral machining marks or deep scratches. Shaft hardness of HRC 45 or higher is typically recommended to resist lip wear. Maximum shaft speed depends on shaft diameter and seal design — in most cases, TC seals are suitable for peripheral speeds up to approximately 4–12 m/s. Consult your specific application requirements to confirm.

How do I install a TC skeleton oil seal without damaging the lip?

Clean the housing bore and shaft. Apply a thin film of clean oil or grease to the seal lip and the OD of the seal. Use a seal driver or a flat press plate to push the seal in squarely — never hammer directly on the seal face. Press until the seal face is flush with or just below the housing bore face. Avoid cocking the seal during installation, as this is a common cause of early lip damage and premature leakage.

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