20PCS TC Skeleton Oil Seal Rings NBR Double Lip Seal Rotary Shaft ID 18 19 20mm

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20PCS TC Skeleton Oil Seal Rings NBR Double Lip Seal Rotary Shaft ID 18 19 20mm

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Size（I.D x O.D x Depth): 18 x 24 x 5 mm

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$36.94 USD

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TC Skeleton Oil Seal with NBR Double Lip — Reliable Rotary Shaft Sealing for ID 18–20mm

When a worn or incorrectly sized shaft seal lets lubricant escape, it can contaminate surrounding components and accelerate bearing wear — a frustrating and costly problem for mechanics, equipment technicians, and serious DIYers. These TC skeleton oil seals are engineered to maintain a consistent sealing barrier on rotating shafts, keeping grease and oil exactly where they belong.

Each pack contains 20 individual TC-type rotary shaft seals constructed with a nitrile rubber (NBR) sealing body bonded to a rigid steel skeleton frame. The double-lip design adds a secondary dust-exclusion lip to the primary oil-retention lip. Inner diameters span 18, 19, and 20mm; outer diameters range from 24mm to 52mm (approximately 0.94–2.05 in); and seal depths (widths) range from 5mm to 10mm (approximately 0.20–0.39 in) depending on the variant selected.

These TC double lip oil seals are well suited for light machinery gearboxes requiring rotary shaft sealing, automotive axle and differential seal replacement, and agricultural or power-tool equipment maintenance where a reliable NBR shaft seal is needed to resist petroleum-based lubricants and moderate temperatures.

⚙️ Compatibility Note: Match your shaft's inner diameter (ID), housing bore outer diameter (OD), and seal cavity depth before ordering. Refer to the Size (I.D × O.D × Depth) variant selector above for the full range of available dimensions.

✅ Key Features of These TC Skeleton Oil Seals

🔩 TC Double-Lip Design

The primary lip retains oil and grease while the secondary dust lip blocks contaminants from entering the bearing cavity, extending the service life of adjacent components.

🧪 NBR Nitrile Rubber Construction

The nitrile rubber (NBR) sealing element resists petroleum-based oils, greases, and hydraulic fluids, and performs reliably across a temperature range of approximately −40°C to +120°C (−40°F to +248°F).

🏗️ Rigid Steel Skeleton Frame

An internal steel reinforcement ring maintains the seal's circular geometry under press-fit installation, preventing distortion and ensuring consistent contact pressure around the shaft.

📐 Wide Size Range in One Listing

With inner diameters of 18, 19, and 20mm and outer diameters from 24mm to 52mm, this listing covers over 50 distinct dimension combinations — reducing the need to source seals from multiple suppliers.

📦 20-Piece Pack for Ongoing Maintenance

Stocking a multi-piece pack means you have replacement seals on hand for scheduled maintenance intervals or unexpected failures, reducing equipment downtime.

🔄 Standard TC Profile for Broad Compatibility

The TC (Type C) profile is one of the most widely used rotary shaft seal standards, making these seals compatible with a broad range of housings designed to accept metric-dimensioned lip seals.

📐 Technical Specifications — TC Rotary Shaft Oil Seals

Seal Type	TC (Double Lip, Spring-Loaded)
Material — Sealing Element	NBR (Nitrile Butadiene Rubber)
Material — Frame	Steel skeleton
Inner Diameter (ID)	18 mm, 19 mm, 20 mm — See variant options
Outer Diameter (OD)	24 mm – 52 mm — See variant options
Seal Depth (Width)	5 mm – 10 mm — See variant options
Lip Configuration	Primary oil lip + secondary dust exclusion lip
Operating Temperature Range	Approximately −40°C to +120°C (−40°F to +248°F)
Compatible Fluids	Petroleum-based oils, greases, hydraulic fluids
Quantity per Pack	20 pieces
Dimension Standard	Metric (mm)
Installation Method	Press-fit into housing bore

❓ Frequently Asked Questions

How do I choose the correct seal size for my application?

Measure three dimensions on your existing seal or shaft housing: the shaft outer diameter (this becomes the seal's inner diameter / ID), the housing bore diameter (this becomes the seal's outer diameter / OD), and the depth of the seal cavity (this becomes the seal width / Depth). Match all three to the variant listed as "I.D × O.D × Depth" in the size selector above.

What does "TC" mean in TC skeleton oil seal?

"TC" refers to a double-lip seal type in the metric oil seal classification system. The first lip (primary) contacts the rotating shaft to retain lubricant; the second lip (secondary) faces outward to exclude dust and debris. This two-lip arrangement makes TC seals more protective than single-lip (SC) seals in environments where contamination is a concern.

Is NBR rubber suitable for my lubricant type?

NBR (nitrile butadiene rubber) is compatible with most petroleum-based mineral oils, greases, and hydraulic fluids. It is not recommended for use with phosphate-ester hydraulic fluids, ketones, or strong acids. If your application uses synthetic esters or silicone-based fluids, consider a Viton (FKM) seal instead.

What is the maximum operating temperature for these seals?

NBR seals typically perform reliably from approximately −40°C to +120°C (−40°F to +248°F). Sustained exposure above 120°C can cause the rubber to harden and lose elasticity, reducing sealing effectiveness. For higher-temperature applications, a silicone or FKM seal material would be more appropriate.

How do I install a TC skeleton oil seal correctly?

Clean the housing bore and shaft thoroughly before installation. Apply a thin film of the system lubricant to the seal lip and the shaft surface. Press the seal squarely into the bore using a flat driver or seal installation tool — never strike the seal face directly with a hammer. The seal should sit flush with or slightly below the housing face. Avoid cocking the seal during installation, as this can damage the lip and cause immediate leakage.

Can I use these seals on high-speed rotating shafts?

TC skeleton oil seals with NBR lips are suitable for moderate shaft speeds. The acceptable surface speed at the lip contact point is typically up to approximately 4–8 m/s depending on the specific seal dimensions and lubrication conditions. For very high-speed applications, consult the equipment manufacturer's specification for the recommended lip material and seal type.

Why buy a 20-piece pack instead of individual seals?

Rotary shaft seals are wear items that require periodic replacement. Purchasing a multi-piece pack ensures you have spares available for the next scheduled service interval without placing a separate order. For workshops or technicians servicing multiple machines with the same shaft dimensions, a pack also reduces per-unit cost compared to sourcing seals individually.

🛒 Select your Size (I.D × O.D × Depth) above, then add to cart.

20PCS TC Skeleton Oil Seal Rings NBR Double Lip Seal Rotary Shaft ID 18 19 20mm

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Description

TC Skeleton Oil Seal with NBR Double Lip — Reliable Rotary Shaft Sealing for ID 18–20mm

✅ Key Features of These TC Skeleton Oil Seals

📐 Technical Specifications — TC Rotary Shaft Oil Seals

❓ Frequently Asked Questions

20PCS TC Skeleton Oil Seal Rings NBR Double Lip Seal Rotary Shaft ID 18 19 20mm

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