TC FB TG4 Skeleton NBR Oil Seals for Rotation Shafts — ID 50–75mm
TC FB TG4 Skeleton NBR Oil Seals for Rotation Shafts — ID 50–75mm
TC FB TG4 Skeleton NBR Oil Seals for Rotation Shafts — ID 50–75mm
TC FB TG4 Skeleton NBR Oil Seals for Rotation Shafts — ID 50–75mm
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TC FB TG4 Skeleton NBR Oil Seals for Rotation Shafts — ID 50–75mmTC FB TG4 Skeleton NBR Oil Seals for Rotation Shafts — ID 50–75mmTC FB TG4 Skeleton NBR Oil Seals for Rotation Shafts — ID 50–75mmTC FB TG4 Skeleton NBR Oil Seals for Rotation Shafts — ID 50–75mm

TC FB TG4 Skeleton NBR Oil Seals for Rotation Shafts — ID 50–75mm

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Beschreibung

TC FB TG4 Skeleton NBR Oil Seals — Reliable Shaft Sealing for ID 50–75mm Applications

When a worn or incorrectly sized shaft seal lets oil weep past the lip, the mess is the least of your problems — contaminated bearings, seized components, and costly downtime follow quickly. Mechanics, equipment rebuilders, and DIY machine restorers who work on gearboxes, pumps, electric motors, and agricultural equipment need a seal they can trust to seat correctly and hold under pressure.

These TC / FB / TG4 skeleton oil seals feature a dual-lip NBR (nitrile rubber) sealing element bonded to a rigid steel case. Each seal is defined by three dimensions — Inner Diameter (ID) × Outer Diameter (OD) × Height (H) — covering a range from 50 x 62 x 7mm (≈1.97\u2033 × 2.44\u2033 × 0.28\u2033) up to 75 x 100 x 12mm (≈2.95\u2033 × 3.94\u2033 × 0.47\u2033). Available in 1, 5, or 10-piece quantities to suit single repairs or workshop stock.

Typical use cases include gearbox output shaft sealing to prevent gear oil leaks, pump shaft seals on hydraulic and water-transfer pumps, electric motor end-cap seals for bearing grease retention, and agricultural PTO shaft seals on tractors and implements — all applications where a reliable NBR rotary shaft seal is the standard solution.

🔵 Compatibility: Fits standard metric housings. Select your exact ID × OD × H from the variant dropdown. TC / FB / TG4 profiles are dimensionally interchangeable in most metric bores. Confirm shaft and bore dimensions with calipers before ordering.
⚠️ Note: Shaft surface finish and housing bore tolerance affect seal life. If your application involves high temperatures above 250°F (120°C) or non-petroleum fluids, please contact us to confirm compatibility before purchasing.

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

  • 🔩Dual-Lip Design — Primary sealing lip retains oil while the secondary dust lip blocks contaminants, extending bearing and lubricant life in dirty or wet environments.
  • 🛡️NBR Rubber Compound — Nitrile butadiene rubber resists petroleum-based oils, greases, and hydraulic fluids across a typical operating range of -40°F to +250°F (-40°C to +120°C).
  • ⚙️Rigid Steel Skeleton Case — The internal metal reinforcement maintains dimensional stability under press-fit installation and prevents the seal from distorting in the housing bore.
  • 📐Wide Size Range — Inner diameters from 50mm to 75mm (≈1.97\u2033–2.95\u2033) with multiple OD and height combinations, covering a broad range of metric gearbox and pump shaft seal replacements.
  • 🔄TC / FB / TG4 Cross-Reference — These profile designations are dimensionally interchangeable in standard metric housings, making it straightforward to replace OEM seals from multiple manufacturers using ID × OD × H matching.
  • 📦Flexible Pack Quantities — Order 1 piece for a single repair, 5 pieces for a service kit, or 10 pieces for workshop stock — all shipped from our US warehouse.

📐 Technical Specifications — TC FB TG4 Skeleton NBR Rotary Shaft Oil Seal

Seal Type TC / FB / TG4 Skeleton (Dual Lip)
Material — Lip NBR (Nitrile Butadiene Rubber)
Material — Case Steel skeleton with rubber-bonded OD
Inner Diameter (ID) Range 50mm–75mm (≈1.97\u2033–2.95\u2033)
Outer Diameter (OD) Range 62mm–110mm (≈2.44\u2033–4.33\u2033)
Height (H) Range 7mm–12mm (≈0.28\u2033–0.47\u2033)
Operating Temperature Typically -40°F to +250°F (-40°C to +120°C)
Compatible Fluids Petroleum-based oils, greases, hydraulic fluids (mineral oil base)
Shaft Surface Finish Typically Ra 0.2–0.8 µm recommended
Lip Count 2 (primary sealing lip + dust exclusion lip)
Available Quantities 1 Pcs / 5 Pcs / 10 Pcs
Exact Dimensions See variant options
Country of Origin Contact us to confirm

❓ Frequently Asked Questions

How do I choose the right oil seal size?

Measure the shaft diameter (inner Φ), the bore diameter (outer Φ), and the housing depth (H) with calipers. Match all three dimensions to the variant listed — for example, 60 x 80 x 10mm means ID 60mm (≈2.36\u2033), OD 80mm (≈3.15\u2033), height 10mm (≈0.39\u2033). Even a 1mm mismatch can cause leaks, so measure twice before ordering.

What material is the sealing lip made from?

The sealing lip is made from NBR (nitrile butadiene rubber), which generally resists petroleum-based oils, greases, and hydraulic fluids. It is not recommended for use with phosphate-ester fluids, ketones, or strong solvents. For those media, a Viton (FKM) seal is typically the correct choice.

What is the operating temperature range?

NBR oil seals typically operate between -40°F and +250°F (-40°C to +120°C). Sustained exposure above this range can cause the rubber to harden and crack, leading to leaks. For higher-temperature applications — such as near exhaust-adjacent components — consider a Viton (FKM) seal instead.

Can these seals be used outdoors or in wet environments?

Yes. The steel outer case is generally treated to resist light moisture exposure. For prolonged outdoor or submerged use, applying a thin bead of RTV sealant to the OD before pressing in is recommended to prevent bore corrosion and improve static sealing at the housing interface.

What shaft surface finish and speed are compatible?

For best sealing performance, the shaft surface should typically be ground to Ra 0.2–0.8 µm (8–32 µin). Peripheral shaft speeds are generally suitable up to approximately 4–6 m/s for standard NBR lip seals. Worn or grooved shafts should be repaired or sleeved before installing a new seal.

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

TC seals have a dual lip (primary sealing lip + dust lip) with a metal case fully encased in rubber on the OD. FB and TG4 designations refer to specific lip geometry or casing configurations used by certain manufacturers — they are dimensionally interchangeable in most standard metric housings. When cross-referencing, always match by ID × OD × H dimensions rather than by type code alone.

How do I install an oil seal without damaging the lip?

Use a seal driver or a flat press plate sized to the OD. Never hammer directly on the seal face or lip. Lightly lubricate the sealing lip with clean oil before installation to prevent dry-start damage. Press in squarely until the seal face is flush with the housing bore. Avoid cocking the seal during installation.

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

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