NBR TC Oil Seal — Double Lip Rotary Shaft Seal, Nitrile Rubber, Metric Sizes

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NBR TC Oil Seal — Double Lip Rotary Shaft Seal, Nitrile Rubber, Metric Sizes

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Inner Diameter: 20mm

Size (ID*OD*Height): 20*28*5mm

Amount: 1pcs

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$1.89 USD

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NBR TC Oil Seal — Stop Leaks on Rotary Shafts with a Reliable Double Lip Design

If you've ever dealt with a weeping gearbox, a leaking axle seal, or a pump that keeps losing fluid, you know how quickly a small seal failure turns into a costly repair. Mechanics, equipment operators, and serious DIYers who work on engines, transmissions, agricultural machinery, or hydraulic systems need a seal they can trust to stay put — one that blocks oil from escaping and keeps dirt and moisture from getting in.

These metric NBR TC oil seals feature a double-lip nitrile rubber construction bonded to a steel outer case. The inner diameter (ID) range is 20–30mm (≈0.79–1.18"), the outer diameter (OD) range is 28–72mm (≈1.10–2.83"), and the height (seal width) range is 5–12mm (≈0.20–0.47"). Multiple sizes are available — select the size that matches your shaft, housing bore, and groove depth.

These double lip rotary shaft seals are well suited for automotive differential and transmission rebuilds, small engine crankshaft sealing, agricultural equipment gearboxes, and light industrial pump and motor applications where a metric oil seal replacement is needed.

🔵 Compatibility: Fits standard metric bore housings. Match the seal's ID to your shaft diameter, OD to your housing bore, and height to your groove depth. Verify all three dimensions before ordering.

✅ Key Features of These NBR TC Double Lip Oil Seals

🛡️ Double Lip (TC) Sealing — The primary lip retains oil and grease while the secondary dust lip blocks dirt, water, and debris, giving rotary shaft applications a two-barrier defense against contamination.
🔩 Steel-Reinforced Outer Case — A rigid steel shell ensures the seal presses squarely into the housing bore and holds its shape under vibration, preventing the distortion that causes early leaks.
🧪 NBR Nitrile Rubber Compound — Nitrile rubber resists petroleum-based oils, ATF, gear oil, and most hydraulic fluids, and remains flexible across a wide temperature range (typically -40°F to +250°F).
📐 Metric Sizing for Direct Replacement — Dimensioned to metric standards (ID 20–30mm, OD 28–72mm, height 5–12mm), making these seals a straightforward drop-in for European and Asian equipment that uses metric oil seal sizes.
⚙️ Garter Spring-Loaded Lip — An internal garter spring maintains consistent radial lip pressure against the shaft as the rubber wears, extending service life and maintaining a reliable seal over time.
🌧️ Suitable for Wet and Outdoor Use — The TC dust lip and NBR compound handle water ingress and mild weathering, making these seals a practical choice for agricultural machinery, outdoor power equipment, and marine auxiliary drives.

📐 Technical Specifications — NBR TC Rotary Shaft Oil Seal

Seal Type	TC (Double Lip with Garter Spring)
Material	NBR (Nitrile Butadiene Rubber) with steel outer case
Inner Diameter (ID)	20–30mm (≈0.79–1.18")
Outer Diameter (OD)	28–72mm (≈1.10–2.83")
Height (Seal Width)	5–12mm (≈0.20–0.47")
Operating Temperature	Typically -40°F to +250°F (-40°C to +120°C)
Max Shaft Speed	Typically up to 4,000 ft/min (≈20 m/s) — see variant for specifics
Fluid Compatibility	Petroleum oil, ATF, gear oil, hydraulic fluid (mineral-based)
Sizing Standard	Metric
Country of Origin	China
Exact Size per Variant	See variant options

⚠️ Before ordering: Measure your shaft OD, housing bore ID, and groove depth with calipers. The three dimensions must match the seal size exactly for a leak-free fit.

❓ Frequently Asked Questions

How do I choose the right size NBR TC oil seal?

Measure three dimensions with calipers: (1) the shaft outer diameter — this becomes the seal's ID; (2) the housing bore inner diameter — this becomes the seal's OD; (3) the groove or housing depth — this becomes the seal height. For example, a 25mm shaft in a 42mm bore with a 7mm groove typically takes a 25×42×7 TC seal. When converting: 1 inch = 25.4mm, so a 1" shaft ≈ 25.4mm ID seal. Always confirm all three dimensions before ordering.

What does the TC designation mean on an oil seal?

TC stands for double-lip design. The primary sealing lip faces inward to retain lubricant (oil or grease), while the secondary dust lip faces outward to block contaminants such as dirt, water, and debris. This dual-barrier construction generally provides better protection than single-lip (SC) seals in dirty, wet, or outdoor environments.

What temperature and pressure range can these seals handle?

NBR nitrile rubber seals typically operate from about -40°F to +250°F (-40°C to +120°C). They are designed for low-pressure dynamic sealing — generally up to about 7 psi (0.5 bar) of continuous pressure. For higher-pressure hydraulic systems, a different seal type (such as a lip seal with a backup ring) is generally recommended.

Are these oil seals compatible with synthetic oils and ATF?

NBR rubber is generally compatible with petroleum-based motor oils, ATF, gear oil, and mineral-based hydraulic fluids. It is not recommended for use with DOT 3/4 brake fluid, phosphate-ester hydraulic fluids, or ketone-based solvents. If you are using a fully synthetic fluid, verify compatibility with an NBR chemical resistance chart, as some synthetic formulations can cause swelling.

Can I use these seals outdoors or in wet environments?

Yes. The secondary dust lip on TC-type seals is specifically designed to exclude water, mud, and debris. NBR rubber has good resistance to water and mild weathering, making these seals suitable for outdoor power equipment, agricultural machinery, and marine auxiliary applications. Prolonged direct UV exposure can degrade rubber over time, so seals installed in exposed locations may benefit from a protective cover.

How do I install an oil seal without damaging the lip?

Clean the housing bore and lightly lubricate the seal lip with the same fluid it will retain. Press the seal in squarely using a seal driver or a flat wooden block — never hammer directly on the seal face. The seal should sit flush or just slightly below the housing surface. If the shaft has a keyway, thread, or sharp edge, protect the seal lip during installation by wrapping the shaft with thin tape or using an installation sleeve.

What shaft speed can these rotary shaft seals handle?

NBR TC oil seals are typically rated for shaft surface speeds up to about 1,500–4,000 ft/min (7–20 m/s), depending on seal diameter and lubrication conditions. Higher shaft speeds generate more frictional heat at the lip contact zone. Ensure adequate lubrication and check the speed rating for your specific size variant if operating at elevated RPM.

🛒 Select your size above, then add to cart — ships from our US warehouse.

NBR TC Oil Seal — Double Lip Rotary Shaft Seal, Nitrile Rubber, Metric Sizes

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Beschreibung

NBR TC Oil Seal — Stop Leaks on Rotary Shafts with a Reliable Double Lip Design

✅ Key Features of These NBR TC Double Lip Oil Seals

📐 Technical Specifications — NBR TC Rotary Shaft Oil Seal

❓ Frequently Asked Questions

NBR TC Oil Seal — Double Lip Rotary Shaft Seal, Nitrile Rubber, Metric Sizes

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