TC/FB/TG4 NBR Skeleton Oil Seals – Shaft & Piston Rod Seal, ID 8–17mm

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TC/FB/TG4 NBR Skeleton Oil Seals – Shaft & Piston Rod Seal, ID 8–17mm

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Inner - Φ x Outer - Φ x H: 8 x 18 x 5mm

QTY: 1 Pcs

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$18.05 USD

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TC/FB/TG4 NBR Skeleton Oil Seals — Stop Shaft Leaks for Good

If you've dealt with oil weeping past a worn shaft seal — whether on a gearbox, hydraulic pump, electric motor, or agricultural equipment — you know how quickly a small leak turns into a costly repair. These TC/FB/TG4 skeleton oil seals are built for mechanics, maintenance technicians, and serious DIYers who need a reliable, correctly-sized replacement seal without hunting through industrial catalogs.

Each seal is constructed from NBR (Nitrile Butadiene Rubber) with a carbon steel skeleton and a garter spring-loaded sealing lip. Available in inner diameters from 8mm (≈5/16") to 17mm (≈43/64"), outer diameters from 18mm (≈23/32") to 45mm (≈1-3/4"), and heights from 5mm (≈3/16") to 10mm (≈3/8"). Select your exact Inner Φ × Outer Φ × H combination from the variant dropdown, and choose a pack of 1, 5, or 10 pieces.

These seals are well-suited for rotating shaft applications including gearbox output shafts, hydraulic cylinder piston rods, electric motor spindles, and pump drive shafts — anywhere you need a dependable radial shaft seal to retain lubricant and exclude contaminants in light-to-moderate duty machinery.

🔵 Compatibility: Fits standard metric shaft and housing bores. Verify your shaft OD, housing bore ID, and housing depth before ordering. Dimensions follow ISO 6194 / DIN 3760 metric sizing conventions.

⚠️ Size confirmation: Measure your existing seal or shaft/bore dimensions carefully. The variant label format is Inner Φ × Outer Φ × H (mm). If you are unsure, contact us before ordering.

✅ Key Features of These TC/FB/TG4 NBR Skeleton Oil Seals

🌀 Spring-Loaded Sealing Lip — The garter spring maintains consistent radial contact pressure against the shaft as the lip wears, extending service life in rotating shaft applications and reducing the risk of gradual lubricant loss.
🛡️ Dual-Lip TC Design — The primary lip retains oil and grease; the secondary dust lip blocks dirt, debris, and moisture from entering the bearing or housing — a critical advantage in agricultural equipment and outdoor machinery.
🔩 Steel Skeleton Reinforcement — The embedded carbon steel case holds the seal's shape under press-fit installation and prevents distortion under operating pressure, ensuring a consistent interference fit in the housing bore.
🧪 NBR Compound Fluid Compatibility — Nitrile rubber resists mineral oils, petroleum-based hydraulic fluids, greases, diesel, and water-glycol mixtures — covering the majority of fluids found in gearboxes, pumps, and hydraulic cylinders.
📐 Wide Size Range in One Listing — Inner diameters from 8mm to 17mm with multiple OD and height combinations let you find the exact replacement seal for piston rod seals, motor spindles, and small gearbox shafts without sourcing from multiple suppliers.
📦 Flexible Pack Quantities — Order 1 piece for a single repair, 5 pieces for a maintenance kit, or 10 pieces for workshop stock — so you're not caught short on the next job.

📐 Technical Specifications — TC/FB/TG4 Skeleton Oil Seal

Seal Type	TC / FB / TG4 (spring-loaded radial shaft seal)
Material — Lip	NBR (Nitrile Butadiene Rubber)
Material — Case / Spring	Carbon steel
Inner Diameter (ID) Range	8mm (≈5/16") – 17mm (≈43/64") — see variant options
Outer Diameter (OD) Range	18mm (≈23/32") – 45mm (≈1-3/4") — see variant options
Height (H) Range	5mm (≈3/16") – 10mm (≈3/8") — see variant options
Operating Temperature	-40°C to +120°C (-40°F to +248°F)
Compatible Fluids	Mineral oils, petroleum hydraulic fluids, greases, diesel, water-glycol mixtures
Max Shaft Surface Speed	Typically up to 4–6 m/s (depending on lubrication and shaft finish)
Max Differential Pressure	Typically up to 0.3 bar (4.4 psi) — low-pressure retention only
Recommended Shaft Finish	Ra ≤ 0.8 µm (32 µin)
Sizing Standard	ISO 6194 / DIN 3760 metric
Pack Quantity	1 Pcs / 5 Pcs / 10 Pcs — see variant options
Color	Contact us to confirm

❓ Frequently Asked Questions

How do I choose the right oil seal size?

Measure your shaft outer diameter (this becomes the seal's ID), your housing bore inner diameter (this becomes the seal's OD), and your housing depth (this becomes H). Select the variant that matches all three. For example, a 16 x 30 x 7mm seal fits a 16mm (≈5/8") shaft in a 30mm (≈1-3/16") bore with a 7mm (≈9/32") housing depth. A seal that is too loose in the bore will leak; one too tight on the shaft will wear the lip prematurely.

What load or pressure can these oil seals handle?

TC/FB/TG4 skeleton seals are generally rated for low-to-moderate differential pressure — typically up to 0.3 bar (≈4.4 psi). They are radial shaft seals designed to retain lubricant and exclude contaminants, not to act as high-pressure hydraulic seals. For higher-pressure circuits, a dedicated hydraulic piston or rod seal is recommended.

Can these seals be used outdoors or in wet environments?

NBR rubber generally handles water, water-glycol mixtures, and mild weather exposure well. The secondary dust lip on TC-type seals helps exclude moisture and debris. However, NBR is not recommended for prolonged exposure to ozone, UV radiation, or aromatic solvents. For harsh outdoor or chemical environments, a Viton (FKM) seal is typically a better fit. Contact us to confirm suitability for your application.

What fluid types are compatible with these NBR seals?

NBR is compatible with mineral oils, petroleum-based hydraulic fluids, greases, diesel fuel, and water-glycol mixtures — covering most gearbox, pump, and hydraulic cylinder applications. NBR is generally not compatible with synthetic esters, phosphate-ester hydraulic fluids, ketones, or strong acids. Always verify fluid compatibility before installation.

What is the difference between TC, FB, and TG4 seal types?

TC seals have a dual-lip design — a spring-loaded primary sealing lip and a secondary dust-exclusion lip. FB seals are typically single-lip designs without a dust lip, suited for cleaner environments. TG4 is a designation used in some regional and manufacturer standards for spring-loaded lip seals. All variants in this listing share the same NBR compound and steel skeleton; the specific lip configuration may vary by size. Contact us to confirm the exact type for your chosen variant.

What shaft surface finish is recommended for best seal life?

A shaft surface roughness of Ra ≤ 0.8 µm (32 µin) is generally recommended for optimal sealing and seal longevity. Shafts with deep tool marks, rust, or pitting will accelerate lip wear and cause early leakage. Lightly polishing the shaft contact zone before fitting a new seal is advisable, especially on older equipment.

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

Clean the shaft and housing bore thoroughly. Lightly coat the seal lip with clean oil or grease. Press the seal squarely into the housing using a flat-faced driver or a seal installation tool sized to the OD — never strike the seal face directly with a hammer. Seat the seal flush or just below the housing face. Avoid cocking the seal during installation, as this permanently deforms the lip and causes immediate leakage.

🛒 Select your size (Inner Φ × Outer Φ × H) and quantity above, then add to cart — ships from our US warehouse.

TC/FB/TG4 NBR Skeleton Oil Seals – Shaft & Piston Rod Seal, ID 8–17mm

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Beschreibung

TC/FB/TG4 NBR Skeleton Oil Seals — Stop Shaft Leaks for Good

✅ Key Features of These TC/FB/TG4 NBR Skeleton Oil Seals

📐 Technical Specifications — TC/FB/TG4 Skeleton Oil Seal

❓ Frequently Asked Questions

TC/FB/TG4 NBR Skeleton Oil Seals – Shaft & Piston Rod Seal, ID 8–17mm

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