What is the load or pressure rating of these seals?

TC skeleton oil seals are generally designed for low-pressure dynamic sealing applications (typically up to 0.3 bar / 4.4 psi). They are not intended for high-pressure hydraulic systems. Contact us to confirm suitability for your specific application.

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home > TC Skeleton Oil Seal | NBR Double Lip Rotary Shaft Seal | ID 40mm 41mm 42mm > TC Skeleton Oil Seal | NBR Double Lip Rotary Shaft Seal | ID 40mm 41mm 42mm

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TC Skeleton Oil Seal | NBR Double Lip Rotary Shaft Seal | ID 40mm 41mm 42mmTC Skeleton Oil Seal NBR Double Lip Rotary Shaft Seal for ID 4042mm Applications When a leaking shaft seal turns a routine maintenance job into a messy, time consuming repair, having the right replacement on hand makes all the difference. Mechanics, equipment technicians, and serious DIYers working on gearboxes, axles, pumps, and agricultural machinery know that a mismatched or worn TC oil seal leads to lubricant loss, contamination ingress, and

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TC Skeleton Oil Seal — NBR Double Lip Rotary Shaft Seal for ID 40–42mm Applications

When a leaking shaft seal turns a routine maintenance job into a messy, time-consuming repair, having the right replacement on hand makes all the difference. Mechanics, equipment technicians, and serious DIYers working on gearboxes, axles, pumps, and agricultural machinery know that a mismatched or worn TC oil seal leads to lubricant loss, contamination ingress, and accelerated bearing wear. This listing covers TC skeleton oil seals with a 40mm, 41mm, or 42mm inner diameter — one of the most common size ranges in metric machinery.

Each seal ships as a 2-piece set (2 PCS per order). The seals feature a steel skeleton (metal case) reinforced NBR nitrile rubber body with a double-lip design: a spring-loaded primary sealing lip and a secondary dust exclusion lip. Available in a wide range of outer diameters (OD) and thicknesses — from compact 40 x 47 x 4mm (≈1.575" x 1.850" x 0.157") up to 42 x 88 x 10mm (≈1.654" x 3.465" x 0.394") — with over 250 size combinations to match your exact housing specification.

Typical applications include automotive rear axle seals and differential pinion seals, agricultural tractor PTO shaft seals, industrial gearbox and pump shaft seals, and hydraulic cylinder rod seals in low-pressure circuits. The NBR compound provides reliable resistance to petroleum-based oils, greases, and mild hydraulic fluids — making these TC rotary shaft seals a dependable choice for standard lubrication environments.

🔵 Compatibility Note: These seals use standard metric dimensions (ID × OD × Thickness in mm). Verify all three measurements against your existing seal or housing drawing before ordering. If your bore is imperial, use the inch equivalents listed in the FAQ below.

⚠️ Installation Tip: Shaft surface finish should typically be Ra 0.2–0.8 µm for optimal seal life. A rough or scored shaft will accelerate lip wear. Inspect and polish the shaft journal before fitting a new seal.

✅ Key Features of These TC Skeleton Oil Seals

🔩Steel Skeleton Construction — The rigid metal case maintains dimensional stability during press-fit installation into the housing bore, preventing distortion that causes premature leakage in rotary shaft seal applications.
💧NBR Double-Lip Design — The spring-loaded primary lip retains lubricant under dynamic shaft rotation, while the secondary dust lip blocks dirt, water, and debris — a critical advantage in agricultural and off-road equipment shaft seals.
🌡️Wide Temperature Range — NBR nitrile compound performs reliably from -40°F to +250°F (-40°C to +120°C), covering most automotive gearbox seal and industrial pump seal operating conditions.
📐250+ Size Combinations — With ID options of 40mm, 41mm, and 42mm paired with ODs from 47mm to 95mm and thicknesses from 4mm to 13mm, this listing covers a broad range of metric shaft seal replacement needs without ordering from multiple sources.
🛢️Oil & Grease Resistant — Formulated to resist petroleum-based lubricants, gear oils, and greases commonly used in differentials, axle housings, and industrial gearboxes — reducing seal swell and maintaining lip contact force over time.
📦Sold in 2-Piece Sets — Each order includes 2 seals, giving you a spare for the opposite side of a shaft or a backup for future maintenance — a practical choice for axle seal replacements that typically come in pairs.

📐 Technical Specifications — TC Skeleton Oil Seal

Seal Type	TC (Double Lip, Spring-Loaded, Metal Case)
Inner Diameter (ID)	40mm (≈1.575"), 41mm (≈1.614"), 42mm (≈1.654")
Outer Diameter (OD)	47mm – 95mm (≈1.850" – 3.740"); see variant options
Thickness	4mm – 13mm (≈0.157" – 0.512"); see variant options
Material — Lip	NBR (Nitrile Butadiene Rubber)
Material — Case	Carbon Steel Skeleton
Lip Configuration	Double Lip (Primary sealing lip + secondary dust lip)
Spring	Garter spring (retains primary lip contact)
Temperature Range	-40°F to +250°F (-40°C to +120°C)
Max Shaft Speed	Typically up to 4–6 m/s (contact us to confirm)
Pressure Rating	Low-pressure dynamic sealing (typically ≤ 0.3 bar)
Compatible Fluids	Petroleum-based oils, gear oils, greases, mild hydraulic fluids
Dimension Standard	Metric (mm)
Packing Quantity	2 PCS per order
Installation Method	Press-fit into housing bore
Lip Orientation	Primary lip faces lubricant (inward)

❓ Frequently Asked Questions

How do I choose the right TC oil seal size?

Measure three dimensions from your existing seal or housing drawing: Inner Diameter (ID) — the shaft diameter; Outer Diameter (OD) — the housing bore diameter; and Thickness — the housing depth. For example, a seal marked 40 x 52 x 7mm means ID 40mm (≈1.575"), OD 52mm (≈2.047"), thickness 7mm (≈0.276"). All three must match your application. If your existing seal is worn, measure the housing bore for OD and the shaft for ID, then check the housing depth for thickness.

What does "TC" mean on an oil seal?

TC is a standard designation for a double-lip, spring-loaded oil seal with a metal skeleton case. The primary lip (with garter spring) retains lubricant under dynamic rotation. The secondary lip acts as a dust excluder. This is the most widely used rotary shaft seal type in automotive differentials, gearboxes, agricultural equipment, and industrial machinery.

What load or pressure can these seals handle?

TC skeleton oil seals are designed for low-pressure dynamic sealing, generally up to approximately 0.3 bar (4.4 psi). They are not suitable for high-pressure hydraulic circuits. For pressurized applications, a hydraulic rod seal or U-cup seal is typically required. Contact us to confirm suitability for your specific pressure conditions.

Can these seals be used outdoors or in wet environments?

NBR nitrile rubber offers good resistance to water, petroleum oils, and mild weather exposure. The secondary dust lip provides additional protection against moisture and debris ingress. For prolonged outdoor exposure, UV radiation, or aggressive chemical environments, FKM (Viton) seals are generally a better choice. In most agricultural and automotive outdoor applications, NBR TC seals perform reliably.

What shaft speed and temperature range are these seals rated for?

NBR TC seals are generally rated for shaft surface speeds up to approximately 4–6 m/s and temperatures from -40°F to +250°F (-40°C to +120°C). Actual performance depends on lubrication quality, shaft surface finish (Ra 0.2–0.8 µm recommended), and installation accuracy. Higher speeds or temperatures may require PTFE-lip or FKM seals.

Are these seals compatible with standard metric bore housings?

Yes. These TC seals follow standard metric dimensions and are designed for press-fit installation into metric bore housings. The OD tolerance is typically h8 for a secure interference fit. Always verify the OD against your housing bore diameter and tolerance before installation. For imperial (inch) housings, use the inch equivalents: e.g., 40mm ID ≈ 1.575", 42mm ID ≈ 1.654".

How do I install a TC skeleton oil seal correctly?

1. Clean the housing bore and shaft journal thoroughly. 2. Inspect the shaft for scoring or roughness — polish if needed. 3. Apply a thin film of clean grease to the seal lip and the housing bore. 4. Press the seal in squarely using a seal driver or flat plate — never hammer directly on the seal face. 5. Ensure the primary lip faces the lubricant side (inward toward the oil). 6. Press flush or to the specified depth. Do not over-press.

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

TC Skeleton Oil Seal | NBR Double Lip Rotary Shaft Seal | ID 40mm 41mm 42mm

Name: TC Skeleton Oil Seal | NBR Double Lip Rotary Shaft Seal | ID 40mm 41mm 42mm
Brand: www.midwoodautocraft.com
SKU: 90468543577
Price: 95.00 USD
Availability: InStock
Rating: 4.6795 (292 reviews)