What thread or shaft standard do these seals fit?

These are metric TC oil seals with a 20mm inner diameter (ID). They fit any round shaft with a 20mm diameter regardless of thread standard. The OD must match your housing bore — select from 40mm to 52mm OD options available in the variant selector.

NBR TC Oil Seal 20mm Shaft – Rotary Shaft Seal 20x40~52mm, Multiple Heights

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NBR TC Oil Seal 20mm Shaft – Rotary Shaft Seal 20x40~52mm, Multiple Heights

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Size(ID x OD x Height): 20 x 40 x 4mm

Pack Quantity(Pcs): 1

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$4.01 USD

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In stock (500 units), ready to be shipped

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NBR TC Oil Seal for 20mm Shafts — Stop Leaks Before They Start

Fluid leaks around rotating shafts are one of the most common — and most frustrating — maintenance headaches for mechanics, equipment operators, and DIYers alike. Whether you're rebuilding a gearbox, servicing an agricultural machine, or repairing a pump, a worn or missing rotary shaft seal lets oil escape and contaminants in, leading to premature bearing failure and costly downtime. These NBR TC oil seals are engineered to solve that problem with a reliable, double-lip design built for 20mm shafts.

Each seal features a 20mm inner diameter (ID) and is available in outer diameters (OD) from 40mm (≈1-37/64") to 52mm (≈2-1/16"), with heights ranging from 4mm (≈5/32") to 12mm (≈15/32"). The body is molded from NBR (nitrile butadiene rubber) with a steel reinforcement ring for dimensional stability. The TC lip arrangement includes a primary sealing lip with a garter spring for consistent radial load, plus a secondary dust-exclusion lip — sold individually or in packs of 1, 2, 5, 8, 10, 20, 25, or 50 pieces.

These rotary shaft oil seals are well-suited for gearbox output shafts, electric motor end caps, agricultural equipment (tillers, mowers, PTO shafts), pump housings, and light industrial machinery. The metric 20mm bore makes them a direct replacement for many OEM seals in European and Asian equipment, and a common fit for DIY shaft seal replacement projects.

ℹ️ Compatibility Note: These seals fit shafts with a 20mm outer diameter. Select the OD that matches your housing bore (40–52mm) and the height that matches your bore depth (4–12mm). If you are unsure of your dimensions, measure the original seal or consult your equipment's service manual before ordering.

⚠️ Tip: If replacing an existing seal, note the three numbers stamped on the old seal (ID × OD × Height in mm) and match them to the variant options above. Contact us if you need help confirming the right size.

✅ Key Features of These NBR TC Rotary Shaft Oil Seals

🔩TC Double-Lip Design — The primary lip with integrated garter spring maintains consistent radial contact pressure on the shaft, while the secondary lip blocks dust, dirt, and moisture ingress — a critical advantage for rotary shaft seal replacement in outdoor or dirty environments.
🧲Steel-Reinforced Shell — A stamped steel insert bonded to the NBR body gives the seal a rigid, press-fit outer diameter that holds its shape in the housing bore and resists blowout under normal operating conditions.
🌡️NBR Rubber Construction — Nitrile rubber provides broad compatibility with petroleum oils, hydraulic fluids, and greases across a typical operating range of -40°F to +250°F (-40°C to +120°C), covering most gearbox oil seal and pump shaft seal applications.
📐Wide Size Selection — With OD options from 40mm to 52mm and heights from 4mm to 12mm, this listing covers a broad range of 20mm shaft seal sizes, reducing the need to source from multiple suppliers for a single repair job.
📦Flexible Pack Quantities — Order as few as 1 piece for a one-off repair or up to 50 pieces for workshop stock or fleet maintenance — pricing scales with quantity so you get better value when buying in bulk.
🏭R23 / DIN 3760 Profile — Conforms to the widely recognized R23 TC lip arrangement standard, making these seals interchangeable with many OEM and aftermarket 20mm shaft seal specifications used in European and Asian machinery.

📐 Technical Specifications — NBR TC Rotary Shaft Oil Seal

Seal Type	TC (Double Lip with Garter Spring)
Lip Arrangement	R23 — Primary sealing lip + secondary dust lip
Inner Diameter (ID / Shaft Size)	20mm (≈25/32")
Outer Diameter (OD)	40mm – 52mm (≈1-37/64" – ≈2-1/16") — see variant options
Height (Width / Thickness)	4mm – 12mm (≈5/32" – ≈15/32") — see variant options
Material — Sealing Element	NBR (Nitrile Butadiene Rubber)
Material — Shell / Insert	Steel (carbon steel, stamped)
Spring	Garter spring (stainless steel, typically)
Operating Temperature	-40°F to +250°F (-40°C to +120°C) — typical for NBR
Max Dynamic Pressure	Typically up to 0.3 bar (≈4.4 psi) — low-pressure rotary applications
Shaft Speed	See variant options — contact us to confirm for high-speed applications
Fluid Compatibility	Petroleum oils, hydraulic fluids, water, greases (not for brake fluid, ketones, or aromatic solvents)
Installation Direction	Lip faces inward toward the fluid being retained
Pack Quantity	1 / 2 / 5 / 8 / 10 / 20 / 25 / 50 pcs — see variant options
Country of Origin	Contact us to confirm

❓ Frequently Asked Questions

How do I choose the right height (width) for my TC oil seal?

Measure the depth of the seal bore in your housing. The seal height should match that depth so the seal sits flush or slightly recessed. For this product, heights range from 4mm (≈5/32") to 12mm (≈15/32"). When in doubt, choose a height that matches your OEM part number or the original seal you are replacing — the three numbers stamped on the old seal are ID × OD × Height in mm.

What load or pressure can these TC oil seals handle?

TC-type rotary shaft seals are generally rated for low-to-medium pressure applications — typically up to 0.3 bar (≈4.4 psi) of dynamic pressure. They are designed for sealing lubricants against atmospheric pressure rather than high-pressure hydraulic systems. Contact us to confirm suitability for your specific application.

Can these oil seals be used outdoors or in wet environments?

NBR (nitrile rubber) offers good resistance to water, oil, and mild weather exposure. The TC double-lip design adds a secondary dust/moisture exclusion lip, making it suitable for moderately wet or dusty outdoor environments — such as agricultural equipment, lawn tractors, or outdoor pumps. For prolonged UV or ozone exposure, a Viton (FKM) seal is generally a better choice.

What shaft diameter do these seals fit, and do they work with metric or imperial shafts?

These seals have a 20mm inner diameter and fit any round shaft with a 20mm outer diameter — metric or imperial (20mm ≈ 0.787"). The OD must match your housing bore; select from 40mm to 52mm OD options in the variant selector above. These are metric-dimensioned seals conforming to the R23 / DIN 3760 TC profile.

What is the temperature range for NBR TC oil seals?

NBR rubber typically operates reliably from approximately -40°F to +250°F (-40°C to +120°C). Continuous exposure near the upper limit may accelerate wear. For higher-temperature applications (above 300°F / 150°C), consider a Viton or silicone seal instead.

How do I install a TC oil seal without damaging it?

Clean the housing bore and shaft. Lightly lubricate the seal lip with the fluid it will retain. Press the seal in squarely using a seal driver or a flat block — never hammer directly on the seal face. Ensure the seal is flush with or slightly below the housing surface. Avoid nicking the lip on sharp shaft edges; use a chamfer or installation sleeve if needed.

What fluids are compatible with NBR oil seals?

NBR seals are generally compatible with petroleum-based oils, hydraulic fluids, water, and many greases. They are not recommended for use with brake fluid (DOT 3/4), ketones, strong acids, or aromatic/chlorinated solvents. Always verify compatibility with your specific fluid before installation.

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

NBR TC Oil Seal 20mm Shaft – Rotary Shaft Seal 20x40~52mm, Multiple Heights

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Description

NBR TC Oil Seal for 20mm Shafts — Stop Leaks Before They Start

✅ Key Features of These NBR TC Rotary Shaft Oil Seals

📐 Technical Specifications — NBR TC Rotary Shaft Oil Seal

❓ Frequently Asked Questions

NBR TC Oil Seal 20mm Shaft – Rotary Shaft Seal 20x40~52mm, Multiple Heights

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