NBR TC Rotary Shaft Oil Seal with Garter Spring | 20–25mm ID

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NBR TC Rotary Shaft Oil Seal with Garter Spring | 20–25mm ID

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Size(IDxODxHeight): 20x28x5mm

Pack of Quantity(Pcs): 1

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$3.25 USD

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NBR TC Rotary Shaft Oil Seal with Garter Spring — Stop Leaks on Gearboxes, Motors & Pumps

A leaking shaft seal is one of the most common causes of premature bearing failure and oil loss in motors, gearboxes, pumps, and agricultural equipment. Whether you're a maintenance technician rebuilding a gearbox or a DIYer replacing a worn seal on a lawn tractor, finding the exact size you need — fast — makes all the difference. These NBR TC rotary shaft oil seals with garter spring are stocked in a wide range of sizes to get your equipment back in service without delay.

Each seal is a TC (dual-lip) design constructed from NBR (nitrile rubber) with a steel-reinforced outer case and an internal garter spring. Inner diameters run from 20mm (≈0.787") to 25mm (≈0.984"), outer diameters from 28mm (≈1.102") to 62mm (≈2.441"), and heights from 5mm (≈0.197") to 10mm (≈0.394"). Available in packs of 1, 5, 10, 20, 50, or 100 pieces to suit single repairs or workshop stock.

Typical applications include electric motor shaft seals, small gearbox output seals, hydraulic pump shaft seals, agricultural machinery axle seals, and power tool spindle seals — anywhere a rotating shaft passes through a housing and must retain lubricant while excluding dust and moisture.

🔵 Size Compatibility: Select the variant that matches your shaft OD (= seal ID), housing bore (= seal OD), and groove depth (= seal height). If your exact size is not listed, contact us — we carry additional sizes not shown here.

✅ Key Features of These NBR TC Rotary Shaft Oil Seals

🔩Dual-Lip TC Design — The primary sealing lip retains oil and grease while the secondary dust lip blocks dirt, water, and debris from entering the bearing cavity, extending lubricant and bearing life in gearbox and motor shaft seal applications.
🌀Garter Spring Loaded — An internal garter spring maintains consistent radial contact force on the shaft across a range of speeds and temperatures, reducing the risk of leakage as the lip wears in over time.
🛡️NBR Rubber Construction — Nitrile rubber provides broad compatibility with petroleum-based oils, mineral greases, and hydraulic fluids — the go-to material for gearbox oil seal replacement and hydraulic pump shaft sealing.
🔧Steel-Reinforced Case — The rigid steel outer case ensures a secure press fit in the housing bore, resisting blowout under normal operating pressures and simplifying installation with a seal driver or press plate.
📐Wide Size Range in One Family — ID from 20mm to 25mm, OD from 28mm to 62mm, height from 5mm to 10mm — covering a broad spectrum of small motor shaft seal and gearbox output shaft seal applications without sourcing from multiple suppliers.
📦Flexible Pack Quantities — Order as few as 1 piece for a single repair or up to 100 pieces for workshop stock, with per-unit cost decreasing at higher quantities — ideal for maintenance shops and fleet operators.

📐 Technical Specifications — NBR TC Rotary Shaft Oil Seal

Seal Type	TC (Dual Lip with Garter Spring)
Material	NBR (Nitrile Rubber) with Steel-Reinforced Case
Inner Diameter (ID) Range	20mm (≈0.787") – 25mm (≈0.984")
Outer Diameter (OD) Range	28mm (≈1.102") – 62mm (≈2.441")
Height (Width) Range	5mm (≈0.197") – 10mm (≈0.394")
Available Sizes (ID×OD×H)	See variant options
Pack Quantities	1, 5, 10, 20, 50, 100 pcs
Operating Temperature	Typically −40°F to +250°F (−40°C to +120°C)
Fluid Compatibility	Petroleum oils, mineral greases, hydraulic fluids
Spring Type	Internal Garter Spring
Lip Configuration	Primary sealing lip + secondary dust exclusion lip
Recommended Shaft Finish	Ra 0.2–0.8 µm (8–32 µin)
Country of Origin	Contact us to confirm

⚠️ Before ordering: Measure your shaft OD, housing bore ID, and groove depth carefully. The seal ID must match the shaft OD; the seal OD must match the housing bore. A 0.5mm mismatch can cause leakage or installation failure. Contact us to confirm if you are unsure.

❓ Frequently Asked Questions

How do I choose the right TC oil seal size?

Measure your shaft outer diameter — that becomes the seal ID. Measure the housing bore for the OD, and the groove depth for the height. For example, a 20mm shaft in a 28mm bore with a 5mm groove takes a 20×28×5mm seal. When in doubt, measure twice and cross-reference your equipment's service manual. If your exact size isn't listed, contact us.

What does "TC" mean on a rotary shaft oil seal?

TC designates a dual-lip seal: the primary lip retains oil or grease inside the housing, while the secondary dust lip faces outward to exclude contaminants. The internal garter spring maintains consistent radial load on the shaft, which is especially important at higher rotational speeds and as the lip wears over time.

What temperature range can these NBR oil seals handle?

NBR seals generally handle temperatures from approximately −40°F to +250°F (−40°C to +120°C) and are suited for low-to-moderate pressure applications. For high-temperature environments or aggressive chemical exposure, FKM (Viton) seals are typically a better choice. Always verify your application's requirements before installation.

Are these seals compatible with petroleum-based oils and greases?

Yes. NBR is well-suited for petroleum-based lubricants, mineral hydraulic oils, and most mineral greases — making it a common choice for gearbox oil seal replacement and hydraulic pump shaft sealing. NBR is generally not recommended for ketones, esters, or highly aromatic fuels. Verify fluid compatibility for your specific application.

Can I use these seals outdoors or in wet environments?

NBR offers good resistance to water and mild weathering, making these seals suitable for outdoor equipment such as agricultural machinery axle seals and lawn equipment in most climates. However, prolonged UV or ozone exposure can degrade NBR over time. For harsh outdoor or marine applications, FKM seals are generally a better long-term option.

What shaft surface finish is recommended for best seal life?

A shaft surface finish of Ra 0.2–0.8 µm (8–32 µin) is generally recommended for rotary shaft seals. Surfaces that are too rough accelerate lip wear; surfaces that are too smooth can reduce the hydrodynamic film that lubricates the lip. Avoid longitudinal machining marks, which can cause leakage along the shaft.

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

Apply a thin film of clean grease to the seal lip and shaft before installation. Use a seal driver or flat press plate to push the seal in squarely — never hammer directly on the seal face. Press until the seal is flush with or just below the housing face. Protect the lip from sharp shaft edges by using a chamfer or installation sleeve. After installation, confirm the garter spring is seated in its groove.

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

NBR TC Rotary Shaft Oil Seal with Garter Spring | 20–25mm ID

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NBR TC Rotary Shaft Oil Seal with Garter Spring — Stop Leaks on Gearboxes, Motors & Pumps

✅ Key Features of These NBR TC Rotary Shaft Oil Seals

📐 Technical Specifications — NBR TC Rotary Shaft Oil Seal

❓ Frequently Asked Questions

NBR TC Rotary Shaft Oil Seal with Garter Spring | 20–25mm ID

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