TC Oil Seal 18mm ID — Metric NBR Double Lip Rotary Shaft Seal

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TC Oil Seal 18mm ID — Metric NBR Double Lip Rotary Shaft Seal

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Size(ID x OD x Height): 18 x 24 x 4mm

Pack Quantity(Pcs): 2

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$2.57 USD

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In stock (500 units), ready to be shipped

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TC Oil Seal 18mm ID — Stop Leaks at the Source with a Metric NBR Double Lip Rotary Shaft Seal

Mechanics, equipment rebuilders, and maintenance technicians know the frustration of a weeping shaft seal: oil on the floor, contaminated bearings, and a job that has to be redone. Whether you're rebuilding a gearbox, servicing an agricultural PTO shaft, or replacing a worn pump seal, getting the exact metric dimensions right the first time is what separates a clean repair from a repeat call-back.

Each seal in this listing features an 18mm Inner Diameter (ID) and is available in a range of Outer Diameters (OD) from 24mm (≈0.945") to 40mm (≈1.575") and heights from 4mm (≈0.157") to 10mm (≈0.394"). The body is NBR (nitrile rubber) bonded to a steel case, with a TC double-lip profile (ISO 6194 / DIN 3760 R23). Pack quantities range from 1 to 50 pieces per order.

Typical use cases include metric gearbox output shaft sealing, agricultural machinery and tractor PTO seal replacement, and hydraulic pump and motor shaft sealing in light-duty industrial equipment — all applications where a reliable, oil-resistant rotary shaft seal with a dust-exclusion lip is needed.

ℹ️ Compatibility Note: All variants share an 18mm Inner Diameter. Select the OD and Height that match your housing bore and groove depth. Confirm dimensions with calipers before ordering — part numbers vary by manufacturer.

✅ Key Features of These TC Double Lip NBR Rotary Shaft Oil Seals

🔒TC Double-Lip Design (ISO 6194 R23) — The primary sealing lip retains lubricant while the secondary dust lip blocks contaminants, making these seals well-suited for gearboxes and axles exposed to dirt and moisture.
🧪NBR Nitrile Rubber Compound — Resists petroleum-based oils, greases, and water splash across a typical service range of −40°C to +120°C (−40°F to +248°F), covering most automotive and light industrial applications.
🔩Steel-Reinforced Case — The rigid outer shell maintains roundness during press-fit installation and resists distortion under housing clamping loads, helping the seal stay seated over time.
📐Wide Size Matrix — 18mm ID Fixed — OD options from 24mm to 40mm and heights from 4mm to 10mm let you match the exact bore and groove dimensions of your equipment without machining or shimming.
📦Flexible Pack Quantities (1–50 pcs) — Order a single seal for a one-off repair or stock up to 50 pieces for fleet maintenance or production use, with per-unit cost decreasing at higher quantities.
⚙️Metric DIN 3760 / ISO 6194 Profile — Dimensioned to metric standards, these seals are direct replacements for OEM parts in European and Asian machinery where inch-size seals would not fit correctly.

📐 Technical Specifications — TC Double Lip NBR Oil Seal

Seal Type	TC (Double Lip) — ISO 6194 / DIN 3760 R23
Inner Diameter (ID)	18mm (≈0.709") — fixed across all variants
Outer Diameter (OD)	24mm – 40mm (≈0.945" – 1.575") — see variant options
Height (Width)	4mm – 10mm (≈0.157" – 0.394") — see variant options
Lip Material	NBR (Nitrile Butadiene Rubber)
Case Material	Steel (carbon steel, press-fit outer shell)
Operating Temperature	Typically −40°C to +120°C (−40°F to +248°F)
Max. Differential Pressure	Generally up to ~0.3 bar (≈4.4 psi) — low-pressure dynamic sealing
Shaft Speed	Typically up to ~4–6 m/s surface speed (contact us to confirm)
Fluid Compatibility	Petroleum oils, mineral greases, water splash; not recommended for synthetic esters or ozone-rich environments
Pack Quantity Options	1, 2, 5, 10, 15, 20, 25, 50 pieces — select above
Country of Origin	See variant options
Standards	ISO 6194 / DIN 3760 R23 (TC profile)

⚠️ Before ordering: Measure your shaft OD, housing bore, and groove depth with calipers. Do not rely solely on part numbers — the same equipment model may use different seal sizes across production years.

❓ Frequently Asked Questions

How do I choose the right size TC oil seal for my application?

Match the seal to three dimensions: Inner Diameter (ID) — must equal the shaft diameter; Outer Diameter (OD) — must match the bore housing; and Height (width) — must fit the groove depth. All sizes on this listing use an 18mm ID. For example, if your shaft is 18mm (≈0.709") and your housing bore is 30mm (≈1.181") with a 6mm groove, select 18 × 30 × 6mm. When in doubt, measure with calipers rather than relying on part numbers alone.

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

TC (also written R23 per ISO 6194) designates a double-lip seal: a primary sealing lip that contacts the shaft and a secondary dust-exclusion lip. This arrangement generally provides better contamination resistance than single-lip (SC/R21) seals, making TC seals a common choice for gearboxes, pumps, and axles exposed to dirt or moisture.

What load or pressure can these oil seals handle?

Standard TC lip seals are designed for low-pressure dynamic sealing — typically up to about 0.3 bar (≈4.4 psi) of differential pressure. They are not intended for high-pressure hydraulic circuits. For shaft speed, NBR lip seals generally perform well up to approximately 4–6 m/s surface speed; consult your equipment manual to confirm suitability.

Are these seals suitable for outdoor or wet environments?

NBR (nitrile rubber) offers good resistance to petroleum-based oils, greases, and water splash, making it suitable for most outdoor machinery and agricultural equipment. However, NBR is generally not recommended for prolonged exposure to ozone, strong UV, or synthetic esters. For those conditions, consider FKM (Viton) seals instead.

What shaft or housing standards are these seals compatible with?

These are metric-dimensioned seals conforming to the ISO 6194 / DIN 3760 R23 (TC) profile. They fit any 18mm shaft regardless of thread standard — the seal contacts the smooth shaft journal, not the threaded section. Confirm the housing bore and groove depth match the OD and height of the variant you select.

How many seals do I get per order, and can I buy in bulk?

Each listing variant lets you choose a pack quantity: 1, 2, 5, 10, 15, 20, 25, or 50 pieces. Larger packs offer a lower per-unit cost, which is useful for maintenance stock or production runs. Simply select your preferred size and quantity from the dropdowns above.

What is the operating temperature range for NBR oil seals?

NBR (nitrile) rubber typically operates reliably from approximately −40°C to +120°C (−40°F to +248°F) in continuous service. Short-term peaks up to around 130°C are generally tolerated. If your application runs hotter, an FKM compound is typically recommended.

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

TC Oil Seal 18mm ID — Metric NBR Double Lip Rotary Shaft Seal

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TC Oil Seal 18mm ID — Stop Leaks at the Source with a Metric NBR Double Lip Rotary Shaft Seal

✅ Key Features of These TC Double Lip NBR Rotary Shaft Oil Seals

📐 Technical Specifications — TC Double Lip NBR Oil Seal

❓ Frequently Asked Questions

TC Oil Seal 18mm ID — Metric NBR Double Lip Rotary Shaft Seal

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