Can these seals be used outdoors or in wet environments?

NBR seals offer moderate water resistance and are generally suitable for splash or intermittent moisture exposure. For fully submerged or prolonged outdoor UV exposure, a Viton (FKM) seal is typically recommended. Contact us to confirm suitability for your specific environment.

What is the difference between a single lip and a dual lip (TC) seal?

A TC-type seal has two lips: the primary lip retains lubricant inside, while the secondary dust lip blocks contaminants from entering. This dual-barrier design makes TC seals the preferred choice for gearboxes, pumps, and motors where both oil retention and dirt exclusion are needed.

How do I convert the seal dimensions to inches?

Divide millimeters by 25.4 to get inches. Common examples: 20mm ≈ 0.787", 22mm ≈ 0.866", 40mm ≈ 1.575", 50mm ≈ 1.969", 7mm ≈ 0.276". Always verify with calipers before ordering.

Should I use any sealant when installing a TC oil seal?

In most cases, a light film of clean oil or grease on the seal lip and a thin bead of gasket sealant on the OD is sufficient for a leak-free installation. Avoid using silicone-based sealants that are not compatible with NBR rubber.

TC Oil Seal ID 20mm 21mm 22mm — NBR 70 Dual Lip Rotary Shaft Seal Ring

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TC Oil Seal ID 20mm 21mm 22mm — NBR 70 Dual Lip Rotary Shaft Seal Ring

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Sizes (ID x OD x Thickness): 20*26*4mm

Packing QTY (Piece): 2 PCS

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TC Oil Seal for 20mm–22mm Rotary Shafts — Stop Leaks at the Source

Mechanics, equipment rebuilders, and DIY enthusiasts know the frustration of a weeping gearbox or a pump that bleeds oil onto the floor. A worn or wrong-sized rotary shaft seal is almost always the culprit — and finding an exact metric replacement in a local hardware store is rarely straightforward. These TC skeleton oil seals are stocked in 190+ size combinations specifically to solve that problem for shafts with a 20mm, 21mm, or 22mm bore.

Each listing is sold as a 2-piece set. The seals feature a carbon steel skeleton (spring-loaded inner case) encapsulated in NBR 70 (Nitrile Butadiene Rubber) with a TC dual-lip profile. Inner diameters (ID) run 20mm (≈0.787"), 21mm (≈0.827"), and 22mm (≈0.866"); outer diameters (OD) range from 26mm (≈1.024") up to 62mm (≈2.441"); thickness options span 4mm (≈0.157") to 12mm (≈0.472"). Select your exact ID × OD × Thickness from the variant dropdown above.

Typical applications include automotive gearbox output shaft seals, small engine crankshaft seals, hydraulic pump shaft seals, electric motor bearing covers, and agricultural equipment PTO shaft seals — anywhere a metric rotary shaft seal with dual lip protection is required.

ℹ️ Compatibility: Fits metric shafts with 20mm, 21mm, or 22mm diameter. Conforms to DIN 3760 / ISO 6194 envelope dimensions. Verify OD and thickness against your housing bore and groove depth before ordering.

✅ Key Features of These TC Dual Lip Oil Seals

🔒 TC Dual Lip Design — The primary lip retains lubricant; the secondary dust lip blocks dirt and debris, making these seals ideal for rotary shaft applications in contaminated environments like gearboxes and outdoor equipment.
🧲 Garter Spring Loaded — An internal carbon steel garter spring maintains consistent radial lip pressure against the shaft, compensating for minor shaft runout and extending service life compared to springless designs.
🛢️ NBR 70 Compound — Nitrile rubber at Shore A 70 hardness resists petroleum-based oils, ATF, gear oil, and hydraulic fluid — the most common lubricants found in automotive and industrial rotary shaft seal applications.
📐 190+ Metric Size Variants — ID options of 20mm, 21mm, and 22mm paired with ODs from 26mm to 62mm and thicknesses from 4mm to 12mm, covering a wide range of metric shaft seal replacement needs in a single listing.
⚙️ Carbon Steel Skeleton Case — The rigid inner skeleton maintains the seal's round shape during press-fit installation into the housing bore, reducing the risk of distortion that can cause premature leakage.
📦 2-Pack Per Order — Each purchase includes 2 seals, giving you a spare on hand for the next service interval — a practical choice for fleet maintenance or any repair where downtime is costly.

📐 Technical Specifications — TC Dual Lip Rotary Shaft Oil Seal

Seal Type	TC (Skeleton, Dual Lip, Spring Loaded)
Inner Diameter (ID)	20mm (≈0.787"), 21mm (≈0.827"), 22mm (≈0.866")
Outer Diameter (OD)	26mm–62mm (≈1.024"–2.441") — see variant options
Thickness	4mm–12mm (≈0.157"–0.472") — see variant options
Lip Material	NBR (Nitrile Butadiene Rubber), Shore A 70
Case / Skeleton	Carbon Steel
Spring	Carbon Steel Garter Spring
Operating Temperature	Typically -40°C to +120°C (-40°F to +250°F)
Compatible Fluids	Petroleum-based oils, ATF, gear oil, hydraulic fluid (mineral-based)
Dimensional Standard	DIN 3760 / ISO 6194 (metric)
Quantity per Pack	2 PCS
Max Shaft Speed	Typically up to 4–6 m/s surface speed (contact us to confirm)
Max Differential Pressure	Typically ≤0.3 bar (≤4.4 psi)
Installation Method	Press-fit into housing bore

⚠️ Size Tip: The variant format is ID × OD × Thickness in millimeters. Measure your shaft OD (= seal ID), housing bore ID (= seal OD), and groove depth (= seal thickness) with calipers before selecting. When in doubt, contact us to confirm.

❓ Frequently Asked Questions

How do I choose the right TC oil seal size?

Match the seal's ID to your shaft diameter, the OD to your housing bore, and the thickness to your groove depth. For example, a 20×40×7mm seal fits a 20mm shaft (≈25/32") in a 40mm housing bore with a 7mm groove. Always measure all three dimensions with calipers — do not rely on worn part markings alone.

What does NBR 70 mean and why does it matter for oil seals?

NBR stands for Nitrile Butadiene Rubber; the "70" refers to Shore A hardness. This compound generally resists petroleum-based oils, ATF, gear oil, and hydraulic fluid well. It typically performs in temperatures from -40°F to +250°F (-40°C to +120°C), making it the standard choice for most automotive and industrial rotary shaft seal applications.

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

NBR offers moderate water and weather resistance and is generally suitable for splash or intermittent moisture exposure. For fully submerged applications or prolonged UV/ozone exposure, a Viton (FKM) seal is typically recommended. Contact us to confirm suitability for your specific outdoor or marine application.

What shaft speed and pressure can these seals handle?

TC-type dual lip oil seals are generally rated for low-to-moderate shaft surface speeds (typically up to 4–6 m/s) and low differential pressures (typically under 0.3 bar / 4.4 psi). For high-speed spindles or pressurized housings, please contact us to confirm compatibility before ordering.

What shaft or housing standard do these seals conform to?

These seals are dimensioned to DIN 3760 / ISO 6194 metric envelope standards, which are the most widely used specifications for radial shaft seals in automotive and industrial equipment worldwide. They fit standard metric shafts with IDs of 20mm, 21mm, or 22mm. For imperial shaft compatibility, divide the shaft diameter in inches by 25.4 to get millimeters and compare to the variant list.

What is the difference between a single lip and a TC dual lip seal?

A TC-type seal has two lips: the primary lip (with garter spring) retains lubricant inside the housing, while the secondary dust lip blocks contaminants — dirt, water, and debris — from entering. Single-lip seals only retain oil. The dual-lip TC design is the preferred choice for gearboxes, pumps, and motors where both oil retention and contamination exclusion are critical.

How do I convert the seal dimensions from mm to inches?

Divide millimeters by 25.4. Quick reference: 20mm ≈ 0.787", 21mm ≈ 0.827", 22mm ≈ 0.866", 30mm ≈ 1.181", 40mm ≈ 1.575", 50mm ≈ 1.969", 7mm ≈ 0.276", 10mm ≈ 0.394". Always verify with calipers — nominal inch sizes rarely match metric dimensions exactly.

Should I use sealant when installing a TC oil seal?

In most cases, apply a light film of clean oil or grease to the seal lip before installation to prevent dry-start damage. A thin bead of anaerobic gasket sealant on the OD is generally sufficient for a leak-free housing fit. Avoid silicone-based sealants that are not rated compatible with NBR rubber, as they can degrade the seal compound over time.

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

TC Oil Seal ID 20mm 21mm 22mm — NBR 70 Dual Lip Rotary Shaft Seal Ring

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Description

TC Oil Seal for 20mm–22mm Rotary Shafts — Stop Leaks at the Source

✅ Key Features of These TC Dual Lip Oil Seals

📐 Technical Specifications — TC Dual Lip Rotary Shaft Oil Seal

❓ Frequently Asked Questions

TC Oil Seal ID 20mm 21mm 22mm — NBR 70 Dual Lip Rotary Shaft Seal Ring

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