TC 50x72x12 mm Double Lip Oil Seal | NBR Rubber-Covered Skeleton Seal for Motors & Reducers
Model / SKU: tc-50-72-12-nbr-brown
The TC 50×72×12mm is one of the most widely used small-to-medium size general-purpose skeleton oil seals in the industrial sector. It features an inner steel skeleton with fully rubber-covered outer diameter, double lip design with garter spring — primary lip for oil retention and auxiliary lip for dust protection. It offers excellent cost-effectiveness and installation tolerance, and is widely compatible with 50mm shaft Y-series motors, cycloidal reducers, small centrifugal pumps, agricultural gearboxes and light vehicle transmission systems, suitable for mineral oil lubrication and medium-speed regular operating conditions.
Tags: TC 50x72x12 oil seal, 50mm shaft rubber seal, motor bearing oil seal, reducer rotary seal, double lip skeleton seal, NBR brown oil seal, ISO 6194 standard seal, industrial general purpose seal, aftermarket replacement seal, pump shaft seal
Product photos
Technical summary
Product specifications. Refer to the approved drawing for dimensional tolerances and installation requirements.
| Spec | Value |
|---|---|
| Size (mm) | 50x72x12 |
| Material | NBR |
| Structure | TC double-lip rubber-covered inner skeleton |
| Material | NBR sealing lip + 08F steel skeleton + carbon steel garter spring |
| Standard | ISO 6194-1, GB/T 13871.1 |
| Size | ID 50mm × OD 72mm × Width 12mm |
Pricing: request a quote (B2B / wholesale).
MOQ / commerce notes: In stock: ships in 1 to 2 days | Not in stock but still in current production: 10 to 15 days | Not in stock and not in production: 25 to 30 days
Product details
This 50-72-12 TC oil seal is a standard off-the-shelf component for industrial OEM and aftermarket maintenance. It is a rotary shaft lip seal with inner metal skeleton, integrally molded and vulcanized from NBR nitrile rubber and cold-rolled steel skeleton under high temperature. The outer diameter is fully covered with rubber, which locks tightly against the housing bore by rubber interference, delivering reliable static sealing performance while absorbing minor vibration during equipment operation and reducing installation noise.
The sealing end adopts a double-lip structure: the primary lip edge undergoes precision post-trimming, with a thin and flat lip surface. Paired with a carbon steel garter spring that provides constant radial clamping force, it fits closely to the shaft surface and effectively blocks internal lubricant and grease leakage. The outer auxiliary lip is a dust lip without spring support, mainly preventing external dust, floating particles and small splashing water from entering the housing, protecting internal bearings and gears from abrasive wear and extending equipment maintenance intervals.
This specification strictly fits standard installation seats with 50mm shaft diameter, 72mm housing bore and 12mm groove depth. It requires shaft surface roughness between Ra 0.8~1.6μm, which is compatible with the conventional machining accuracy of most general equipment. It has good installation tolerance and can achieve sealing performance without ultra-high precision machining, making it especially suitable for batch maintenance and replacement scenarios.
Under normal operating conditions, the working temperature ranges from -30℃ to 120℃, with a maximum allowable peripheral speed of 12 m/s. It is mainly compatible with mineral-based lubricants and greases, and can also withstand short-term exposure to diesel and general hydraulic oil. It is an extremely versatile basic sealing component used in almost all industrial sectors.
Material & Process
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FAQ
What is a TC 50x72x12 oil seal used for?
It is widely used for bearing sealing on 50mm shafts of electric motors, gear reducers, centrifugal pumps, agricultural machinery and light vehicle transmissions, retaining lubricant inside and blocking dust outside.
What does TC mean in oil seals?
TC stands for double-lip rubber-covered inner skeleton oil seal. It has a steel skeleton fully covered by rubber for rigid mounting, a primary lip with garter spring for oil sealing, and an auxiliary dust lip for contamination protection.
What is the maximum speed for this oil seal?
The recommended maximum surface speed is 12 m/s under medium load and mineral oil lubrication conditions.
Is this seal compatible with hydraulic oil?
It is compatible with mineral-based hydraulic oil and diesel for short-term exposure. For strong chemical fluids, FKM version is recommended.
What is your MOQ for this item?
Sample order from 100pcs is acceptable. Bulk order is 5000pcs. We also support custom requirements with larger MOQ.
Do you offer FKM version of this size?
Yes, we also provide FKM fluororubber version for high temperature and chemical resistance applications.