What thread or shaft standards are these compatible with?

These are metric TC oil seals conforming to the R23 / DIN 3760 standard. They are designed for 8mm metric shafts. The TC double-lip design includes a primary sealing lip and a secondary dust-exclusion lip, compatible with standard metric housing bores. They are not designed for NPT, BSP, or SAE shaft standards without adapter housings.

8mm ID Metric TC Double Lip NBR Oil Seal — Rotary Shaft Seal, Multiple Sizes

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8mm ID Metric TC Double Lip NBR Oil Seal — Rotary Shaft Seal, Multiple Sizes

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Size(ID x OD x Height): 8 x 12 x 3mm

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8mm ID TC Double Lip NBR Oil Seal — Stop Leaks on Metric Rotary Shafts

When a worn or missing shaft seal lets oil seep past a gearbox, pump, or motor bearing, the mess — and the damage — adds up fast. These 8mm inner diameter TC double lip NBR oil seals are built for mechanics, equipment technicians, and serious DIYers who need a reliable metric rotary shaft seal that installs correctly the first time and stays put.

Each seal features an 8mm (≈5/16") inner diameter with outer diameters ranging from 12mm (≈15/32") to 26mm (≈1") and heights from 3mm to 10mm, covering a wide range of metric housing bores. The body is constructed from NBR (nitrile butadiene rubber) bonded to a steel case, with a garter spring-loaded primary lip for consistent radial sealing force. Available in packs of 2, 5, 10, 15, 20, 50, or 100 pieces — select the size and quantity that matches your job.

Typical applications include small gearbox output shafts, electric motor shaft ends, hydraulic pump shafts, agricultural equipment, and light industrial machinery where a metric TC oil seal for 8mm shafts is required. The dual-lip design also makes these a practical choice as a dust seal for precision spindles and rotary actuators.

ℹ️ Compatibility Note: These seals conform to the metric R23 / DIN 3760 TC standard with an 8mm shaft bore. Verify your housing OD and groove depth before ordering. See the size selector above for all available OD × Height combinations.

✅ Key Features of These 8mm ID TC Double Lip NBR Oil Seals

🔩TC Double Lip Design — Primary spring-loaded sealing lip retains oil while the secondary dust lip blocks contaminants, making this a true dual-function metric rotary shaft seal.
🧲Garter Spring Retention — An internal garter spring maintains consistent radial lip pressure against the shaft, compensating for minor shaft runout and extending service life.
🛡️NBR Rubber Construction — Nitrile rubber resists petroleum oils, ATF, gear oil, and water splash across a typically rated temperature range of −40°F to +250°F (−40°C to +120°C).
⚙️Steel-Reinforced Case — The rigid steel outer shell ensures a secure press-fit into the housing bore, preventing seal rotation and maintaining concentricity with the shaft.
📐Wide Size Range — OD options from 12mm to 26mm and heights from 3mm to 10mm let you match the exact housing bore for your 8mm shaft application without modification.
📦Flexible Pack Quantities — Order as few as 2 for a single repair or up to 100 for workshop stock — ideal for service shops stocking metric TC oil seals for 8mm shafts across multiple machines.

📐 Technical Specifications — TC Double Lip NBR Oil Seal (8mm ID)

Seal Type	TC (Double Lip with Garter Spring)
Standard	Metric R23 / DIN 3760
Inner Diameter (ID)	8mm (≈5/16")
Outer Diameter (OD)	12mm–26mm (≈15/32"–1") — see variant options
Height (Width)	3mm–10mm (≈1/8"–3/8") — see variant options
Lip Material	NBR (Nitrile Butadiene Rubber)
Case Material	Steel (carbon steel, zinc-plated)
Spring Type	Garter spring (stainless steel)
Operating Temperature	Typically −40°C to +120°C (−40°F to +250°F)
Max Shaft Speed	Typically up to 4–8 m/s surface speed (confirm for application)
Fluid Compatibility	Petroleum oils, ATF, gear oil, water splash; not for ketones or phosphate esters
Pack Quantities	2, 5, 10, 15, 20, 50, 100 pcs
Country of Origin	See variant options
Shaft Fit	Contact us to confirm for critical applications

⚠️ Sizing Tip: Always measure your existing seal (ID × OD × Height) or your shaft and housing bore directly before ordering. Dimensions listed are nominal metric values; actual fit tolerance follows DIN 3760 press-fit guidelines.

❓ Frequently Asked Questions

How do I choose the right OD and height for my application?

Match the inner diameter (ID) to your shaft diameter — all variants here are 8mm (≈5/16") ID. Then select the outer diameter (OD) to fit your housing bore, and the height (width) to match the groove or bore depth. When in doubt, measure the existing seal or consult your equipment manual. Quick inch conversions: 12mm ≈ 15/32", 16mm ≈ 5/8", 20mm ≈ 25/32", 25mm ≈ 63/64".

What load or pressure can these oil seals handle?

TC-type rotary shaft seals are generally designed for low-to-medium pressure applications. They are typically rated for shaft surface speeds up to around 4–8 m/s and pressures up to approximately 0.05 MPa (0.5 bar) under normal conditions. For high-pressure or high-speed applications, confirm suitability with your equipment specifications before installation.

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 generally suitable for outdoor use in moderate conditions. However, NBR is not recommended for prolonged exposure to ozone, strong UV, or certain synthetic fluids. For harsh outdoor or chemical environments, consider FKM (Viton) seals instead.

What shaft and housing standards are these compatible with?

These are metric TC oil seals conforming to the R23 / DIN 3760 standard, designed for 8mm metric shafts. The TC double-lip design is compatible with standard metric housing bores. They are not designed for NPT, BSP, or SAE shaft standards without adapter housings. Always verify the housing bore diameter matches the seal OD you select.

How do I install a TC oil seal correctly?

Clean the housing bore and shaft thoroughly. Lightly lubricate the seal lip with the fluid being sealed (e.g., clean oil or grease). Press the seal squarely into the bore using a seal driver or a flat block — never hammer directly on the seal face. Ensure the seal sits flush or slightly below the housing face. Use a chamfer or installation sleeve on the shaft to avoid nicking the lip on sharp edges.

What is the difference between TC and SC oil seal types?

A TC seal has two sealing lips: a primary lip that retains oil and a secondary lip that excludes dust and contaminants. An SC seal has a single lip for oil retention only. TC seals are generally preferred for applications where both oil retention and dust exclusion are needed, such as gearboxes, pumps, and wheel hubs — which is why the TC type is the most common choice for metric rotary shaft seals.

Can I use these seals with synthetic oils or ATF?

NBR is compatible with most petroleum-based oils, ATF (automatic transmission fluid), and many gear oils. It is generally not compatible with phosphate ester hydraulic fluids, ketones, or highly aromatic fuels. Always verify fluid compatibility with the NBR material specification before use in critical applications.

How many seals do I need to order for a typical repair?

For a single shaft repair, a pack of 2 is typically sufficient — one to install and one spare. Service shops and technicians working on multiple machines generally stock packs of 20–100 to cover common sizes. Select the pack quantity that matches your usage volume from the options above.

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

8mm ID Metric TC Double Lip NBR Oil Seal — Rotary Shaft Seal, Multiple Sizes

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Beschreibung

8mm ID TC Double Lip NBR Oil Seal — Stop Leaks on Metric Rotary Shafts

✅ Key Features of These 8mm ID TC Double Lip NBR Oil Seals

📐 Technical Specifications — TC Double Lip NBR Oil Seal (8mm ID)

❓ Frequently Asked Questions

8mm ID Metric TC Double Lip NBR Oil Seal — Rotary Shaft Seal, Multiple Sizes

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