NBR Rotary Shaft Oil Seal | Nitrile Lip Seal 17–20mm Shaft | TC / TG4 / FB | Multi-Size

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NBR Rotary Shaft Oil Seal | Nitrile Lip Seal 17–20mm Shaft | TC / TG4 / FB | Multi-Size

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Size(ID x OD x Height): 17 x 27 x 7mm

Pack Quantity(pcs): 5

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$4.34 USD

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In stock (500 units), ready to be shipped

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NBR Rotary Shaft Oil Seal — Reliable Nitrile Lip Seal for 17–20mm Shafts

When a leaking shaft seal turns a routine maintenance job into a messy, time-consuming repair, having the right replacement on hand makes all the difference. Whether you're a mechanic rebuilding a gearbox, a farmer servicing equipment mid-season, or a DIYer tackling a pump overhaul, a failed oil seal costs you time and fluid. These NBR rotary shaft oil seals are stocked in a wide range of sizes so you can find the exact fit without hunting through multiple suppliers.

Each seal is a TC-type (also listed as TG4 / FB) double-lip design made from NBR nitrile rubber with a steel outer case. Sizes span shaft inner diameters (ID) from 17mm to 20mm, with outer diameters (OD) from 27mm to 52mm and heights from 5mm to 10mm — all dimensions listed in the format ID × OD × Height. Dual-unit reference: for example, a 20mm shaft is approximately 13/16", and a 35mm OD is approximately 1-3/8". Available in packs of 2, 5, 8, 10, 20, 30, or 50 pieces to suit single repairs or workshop stock.

Typical applications include gearbox output shaft seals, hydraulic pump shaft seals, electric motor end-cap seals, agricultural equipment PTO seals, and automotive differential pinion seals — anywhere a nitrile lip seal for a 17–20mm rotating shaft is required.

🔵 Compatibility: Fits shafts with an inner diameter (ID) of 17mm, 18mm, 19mm, or 20mm. Always verify all three dimensions — ID × OD × Height — against your housing before ordering. See variant selector above for the full size list.

✅ Key Features of These NBR Rotary Shaft Oil Seals

🔩TC Double-Lip Design — The primary lip retains lubricant while the secondary dust lip blocks contaminants, making this TC / TG4 / FB seal the standard choice for gearbox and pump shaft applications.
🧪NBR Nitrile Rubber Construction — Nitrile rubber resists petroleum-based oils, gear oils, greases, and water splash across a typical service range of -40°F to +250°F (-40°C to +120°C).
🔧Steel-Reinforced Outer Case — The rigid metal shell holds the seal firmly in the housing bore, preventing rotation and maintaining concentricity on the shaft during operation.
📐Wide Size Selection — 17mm to 20mm Shaft ID — Over 45 distinct ID × OD × Height combinations cover a broad range of rotary shaft oil seal replacements without needing custom parts.
📦Flexible Pack Quantities — Order as few as 2 pieces for a single repair or up to 50 pieces for workshop inventory, with per-unit cost decreasing at higher quantities.
⚙️Drop-In Replacement Fit — Manufactured to standard metric dimensions, these seals are dimensionally interchangeable with OEM TC-type nitrile lip seals from most equipment manufacturers.

📐 Technical Specifications — TC / TG4 / FB Rotary Shaft Oil Seal

Seal Type	TC / TG4 / FB (Double-Lip Rotary Shaft Seal)
Material	NBR (Nitrile Butadiene Rubber) lip; steel outer case
Shaft ID Range	17mm, 18mm, 19mm, 20mm (≈ 43/64" – 25/32")
OD Range	27mm – 52mm (≈ 1-1/16" – 2-1/16") — see variant options
Height Range	5mm – 10mm (≈ 3/16" – 3/8") — see variant options
Operating Temperature	Typically -40°F to +250°F (-40°C to +120°C)
Fluid Compatibility	Mineral oils, gear oils, hydraulic fluids, greases, water, diesel
Pressure Rating	Low-to-moderate pressure (contact us to confirm for high-pressure use)
Lip Configuration	Dual lip — primary sealing lip + secondary dust exclusion lip
Pack Quantities Available	2, 5, 8, 10, 20, 30, 50 pieces
Dimension Format	ID × OD × Height (all in mm)
Country of Origin	See variant options

⚠️ Before ordering: Measure your shaft OD (= seal ID), housing bore ID (= seal OD), and cavity depth (= seal height). All three dimensions must match. If your existing seal is worn or damaged, cross-reference the size stamped on its face or measure the housing directly.

❓ Frequently Asked Questions

How do I choose the right oil seal size?

Measure the shaft diameter (ID), the bore diameter in the housing (OD), and the depth of the seal cavity (Height). All three dimensions must match the seal you order. For example, a 20 × 35 × 7mm seal fits a 20mm (≈ 13/16") shaft, a 35mm (≈ 1-3/8") housing bore, and a 7mm (≈ 9/32") deep cavity. When in doubt, go by the shaft diameter first, then confirm OD and height against your housing.

What does TC / TG4 / FB mean on an oil seal?

TC (also called TG4 or FB depending on the manufacturer) is a double-lip rotary shaft seal design. The primary lip retains lubricant; the secondary dust lip keeps contaminants out. This dual-lip construction is generally the most common type used in gearboxes, pumps, and agricultural equipment.

What is the temperature and pressure range for these NBR seals?

NBR (nitrile rubber) oil seals typically 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-heat environments above 250°F, a Viton (FKM) seal is generally recommended instead.

Are these seals suitable for outdoor or wet environments?

Yes. NBR nitrile rubber has good resistance to petroleum-based oils, greases, and water splash. The secondary dust lip on TC-type seals also helps exclude mud and moisture. For continuous submersion or aggressive chemical exposure, confirm compatibility with your specific fluid before installing.

What fluids are these NBR oil seals compatible with?

NBR seals are generally compatible with mineral-based engine oils, gear oils, hydraulic fluids, greases, water, and diesel fuel. They are not recommended for use with ketones, esters, or highly aromatic fuels. When in doubt, contact us to confirm compatibility.

How do I install a rotary shaft oil seal correctly?

Clean the housing bore and shaft. Lightly lubricate the seal lip with the fluid it will retain. Press the seal squarely into the bore using a flat driver or seal installation tool — never hammer directly on the seal face. The seal should sit flush or just below the housing surface. Avoid nicking the lip on sharp shaft edges; use a chamfer or installation sleeve if needed.

Can I use these seals on a rotating shaft in a gearbox or pump?

Yes. TC-type rotary shaft seals are designed specifically for rotating shafts. They are commonly used in gearboxes, hydraulic pumps, electric motors, agricultural machinery, and automotive differentials. Shaft surface finish and runout affect seal life — a smooth, hardened shaft surface is recommended for best results.

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

NBR Rotary Shaft Oil Seal | Nitrile Lip Seal 17–20mm Shaft | TC / TG4 / FB | Multi-Size

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Description

NBR Rotary Shaft Oil Seal — Reliable Nitrile Lip Seal for 17–20mm Shafts

✅ Key Features of These NBR Rotary Shaft Oil Seals

📐 Technical Specifications — TC / TG4 / FB Rotary Shaft Oil Seal

❓ Frequently Asked Questions

NBR Rotary Shaft Oil Seal | Nitrile Lip Seal 17–20mm Shaft | TC / TG4 / FB | Multi-Size

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