TC Skeleton Oil Seal | NBR Double Lip Rotary Shaft Seal | ID 70–79mm

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TC Skeleton Oil Seal | NBR Double Lip Rotary Shaft Seal | ID 70–79mm

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Sizes (ID x OD x Thickness): 70 x 80 x 6mm

Packing QTY (Piece): 1 PCS

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$2.82 USD

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In stock (500 units), ready to be shipped

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TC Skeleton Oil Seal — NBR Double Lip Rotary Shaft Seal for ID 70–79mm Shafts

When a leaking shaft seal turns a routine maintenance job into a costly teardown, having the right replacement on hand makes all the difference. Mechanics, equipment technicians, and serious DIYers working on gearboxes, pumps, motors, and agricultural machinery need TC oil seals that fit precisely and hold up under continuous rotation — not generic parts that fail within a season.

Each seal in this listing is a TC-type skeleton oil seal constructed with an NBR (nitrile rubber) elastomer bonded to a rigid steel inner skeleton. The double-lip design includes a primary sealing lip for oil retention and a secondary dust exclusion lip. Sizes span inner diameters from 70mm (≈2.76") to 79mm (≈3.11"), with outer diameters ranging from 80mm to 150mm and thicknesses from 5mm to 20mm — over 200 individual size combinations available in a single listing. Select your exact ID × OD × Thickness from the variant dropdown.

These TC skeleton oil seals are a direct-fit replacement for rotating shaft applications including agricultural tractor PTOs, industrial gearbox output shafts, hydraulic pump drive shafts, electric motor end caps, and automotive differential pinion seals. The standardized metric dimensions follow ISO 6194 / DIN 3760 conventions, making cross-referencing straightforward for maintenance professionals sourcing rotary shaft sealing solutions.

🔵 Compatibility Note: These seals follow metric ISO 6194 / DIN 3760 dimensions. Verify your shaft ID, housing bore OD, and housing depth (thickness) before ordering. Dimensions are listed as ID × OD × Thickness in millimeters.

⚠️ Size Confirmation: With 200+ variants available, please double-check all three dimensions (ID, OD, and thickness) against your original seal or housing drawing before adding to cart.

✅ Key Features of These TC Skeleton Oil Seals

🔩Rigid Steel Skeleton Core — The internal metal reinforcement ring maintains dimensional stability under press-fit installation and prevents the seal from collapsing or distorting in the housing bore.
💧NBR Double-Lip Sealing — The primary lip retains oil and grease while the secondary dust lip blocks dirt, debris, and moisture ingress — a dual-barrier design suited for rotating shaft sealing in contaminated environments.
📐200+ Metric Size Variants — ID 70–79mm with OD options from 80mm to 150mm and thicknesses from 5mm to 20mm, covering a wide range of gearbox, pump, and motor shaft seal replacements in a single listing.
🌡️NBR Compound for Oil Resistance — Nitrile rubber is compatible with petroleum-based oils, gear lubricants, and hydraulic fluids, with a generally rated operating temperature range of approximately -40°C to +120°C (-40°F to +248°F).
⚙️ISO 6194 / DIN 3760 Metric Standard — Dimensionally standardized for straightforward cross-referencing against OEM part numbers on agricultural equipment, industrial machinery, and automotive drivetrain components.
🛠️Press-Fit Housing Installation — The outer metal case provides a firm interference fit into the housing bore, eliminating the need for adhesive sealants in most standard applications and allowing clean removal during future servicing.

📐 Technical Specifications — TC Skeleton Oil Seal

Seal Type	TC (Double Lip with Dust Exclusion Lip)
Inner Diameter (ID) Range	70mm–79mm (≈2.76"–3.11")
Outer Diameter (OD) Range	80mm–150mm (see variant options)
Thickness Range	5mm–20mm (see variant options)
Material — Sealing Element	NBR (Nitrile Butadiene Rubber)
Material — Skeleton / Case	Carbon steel (inner skeleton + outer case)
Lip Configuration	Double lip — primary oil lip + secondary dust lip
Operating Temperature	Typically -40°C to +120°C (-40°F to +248°F)
Max Shaft Surface Speed	Typically 4–8 m/s (depending on lubrication and shaft finish)
Pressure Rating	Low-pressure / static sealing (generally ≤0.05 MPa)
Dimensional Standard	ISO 6194 / DIN 3760 metric
Compatible Fluids	Petroleum-based oils, gear oils, hydraulic fluids (mineral-based)
Installation Method	Press-fit into housing bore
Quantity per Order	1 PCS per variant (see Packing QTY option)
Spring	Contact us to confirm (garter spring typically included on primary lip)

❓ Frequently Asked Questions

How do I choose the right TC oil seal size?

Measure the shaft inner diameter (ID), the bore outer diameter (OD), and the housing depth (thickness). Match all three dimensions to the variant label shown as ID × OD × Thickness. For example, a 75 × 100 × 10mm seal has a 75mm (≈2.95") shaft bore, 100mm (≈3.94") housing bore, and 10mm (≈3/8") width. When in doubt, prioritize the shaft diameter — it is the most critical fit dimension.

What load or pressure can these TC oil seals handle?

TC skeleton oil seals are generally designed for low-to-medium pressure applications. They are typically rated for static pressures up to 0.05 MPa (0.5 bar) and are not intended for high-pressure hydraulic circuits. For higher-pressure environments, a dedicated hydraulic rod seal is recommended.

Are these oil seals suitable for outdoor or wet environments?

NBR (nitrile rubber) offers good resistance to petroleum-based oils, water, and mild weather exposure. For prolonged outdoor use or exposure to ozone, UV, or aggressive chemicals, an FKM (Viton) seal is generally a better choice. These NBR seals are well-suited for indoor machinery, agricultural equipment, and light outdoor applications.

What shaft or housing standards are compatible with these seals?

TC oil seals are dimensionally standardized by shaft diameter and housing bore — they are not thread-specific. They are compatible with metric shafts following ISO 6194 / DIN 3760 standards. Always verify the ID, OD, and thickness match your housing before installation. Shaft surface finish of Ra 0.2–0.8 µm is recommended for optimal lip sealing.

What is the difference between TC and SC oil seals?

TC seals have a double lip design — a primary sealing lip that retains oil and a secondary dust lip that keeps contaminants out. SC seals have only a single lip. TC seals are generally preferred for most rotating shaft applications because the dual-lip design provides better protection in dirty or dusty environments such as agricultural and construction equipment.

Can I use these seals with synthetic oils or gear lubricants?

NBR is compatible with most mineral-based and petroleum-based oils, including many gear oils and hydraulic fluids. Compatibility with fully synthetic PAO or ester-based oils varies — in those cases, confirm NBR compatibility with your lubricant supplier or consider an FKM seal for guaranteed chemical resistance.

What is the maximum shaft speed for these TC oil seals?

Maximum shaft surface speed for TC skeleton oil seals is typically in the range of 4–8 m/s, depending on shaft finish, lubrication, and operating temperature. For high-speed applications, ensure the shaft surface has a fine finish (Ra 0.2–0.8 µm) and that adequate lubrication is present at the lip contact zone to prevent premature lip wear.

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

TC Skeleton Oil Seal | NBR Double Lip Rotary Shaft Seal | ID 70–79mm

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TC Skeleton Oil Seal — NBR Double Lip Rotary Shaft Seal for ID 70–79mm Shafts

✅ Key Features of These TC Skeleton Oil Seals

📐 Technical Specifications — TC Skeleton Oil Seal

❓ Frequently Asked Questions

TC Skeleton Oil Seal | NBR Double Lip Rotary Shaft Seal | ID 70–79mm

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