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
Key specs: Inner diameter mm: 50 | Outer diameter mm: 72 | Height mm: 12 | 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 | specifications: ID 50mm × OD 72mm × Width 12mm
- Inner diameter mm: 50
- Outer diameter mm: 72
- Height mm: 12
- 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
- specifications: ID 50mm × OD 72mm × Width 12mm
- 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
Technical summary
Product specifications. Refer to the approved drawing for dimensional tolerances and installation requirements.
| Spec | Value |
|---|---|
| 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).
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
[object Object]
Applications & Compatibility
[object Object]
FAQ
I only have a competitor/OEM part number—can you cross-reference?
Yes. Send the reference PN, ID×OD×height in mm, and duty (media, temperature, pressure, speed). We match equivalents in the catalog; the Cross Reference page also searches by keyword. Final selection follows drawing and duty confirmation — do not order from a photo alone.
Do you support OEM/ODM, private packing and marking?
Yes — OEM/ODM from drawings or samples, plus agreed packing and marking. Share target-market compliance needs and annual volume; RFQ confirms process, tooling cost and cadence. VKEFOT is the export brand of the Xingtai factory, not a trading desk.
TC vs TB oil seal: which should I specify?
For a rotary shaft that needs a dust lip plus oil lip, start with TC (rubber-covered dual-lip is common); TB is typical when a semi-metal case needs a stiffer bore fit. Shaft diameter, housing, runout and dust still decide. Send ID×OD×height in mm and speed on the RFQ — not only a competitor photo.
NBR vs FKM oil seal for hot engine oil?
Continuous engine-oil duty near 120°C or fuel exposure should be reviewed as FKM; general mineral oil at moderate temperature and cost-sensitive repair jobs often stay NBR. Brown color is not proof of FKM. The quote names the grade and temperature limit — do not order by color.
Oil seal vs O-ring: when do I use which?
Use a metal-cased radial shaft (skeleton) oil seal for rotating shafts; use an O-ring for static glands or reciprocating grooves. An O-ring on a rotary shaft wears out quickly. VKEFOT makes both — state motion type (rotary/static/reciprocating) and ID×OD×section on the RFQ.
Cassette seal vs dual-lip TC for dusty construction equipment?
Ag gearboxes and construction travel shafts with mud and long service intervals should be reviewed as cassette/combined seals; many automotive hub repair jobs stay dual-lip TC. Cassette packs are thicker and need different bore and axial space. A job-site photo is not enough — send ID×OD×height.
Xingtai oil seal factory vs trading company — how do I tell?
VKEFOT is the export brand of Xingtai Hanchi Intelligent Technology Co., Ltd. Mixing, vulcanization and outgoing inspection run in Xingtai, then goods export to Europe, North America, the Middle East and Southeast Asia. A trading desk usually cannot change compound or cut tooling. For OEM drawings, ask who runs the process and QC — not only catalog price.
What is a skeleton / radial shaft oil seal?
A skeleton oil seal is a metal-cased radial shaft seal: the rubber lip rides the shaft and the case holds interference in the bore. Common styles include TC, TB and TA. Minimum spec is ID×OD×height in mm, compound and duty. VKEFOT catalogs automotive and industrial shaft seals; trust the product-page dimensions.
What do ID, OD and height mean on an oil seal RFQ?
ID is inside diameter (shaft), OD is outside diameter (bore), height is axial width, all in millimetres. Missing any one blocks a cross-reference. Example: 56×112×8/10 means 56 mm ID, 112 mm OD, 8/10 mm height. Put those three numbers and the compound on the RFQ.
Which oil seal for an automotive wheel hub or differential pinion?
Hub repair jobs often use dual-lip TC; differential pinion shafts often need a secondary lip or split height (e.g. 8/10 or 12/22 mm). Use measured or OEM dimensions — not a marketplace title. VKEFOT application pages cover drivetrains and hubs; send an OEM number or ID×OD×height on the RFQ.
How to select oil seals for ag gearbox and PTO shafts?
Ag gearboxes and PTO shafts see dust and shock — prefer a dust lip or cassette, with NBR or FKM matched to gear oil and temperature. Do not force a passenger-car hub seal onto a PTO shaft. Send shaft, bore, height and whether mud/water is present, then RFQ.
What matters for pump, valve and compressor shaft seals?
Match media (oil, water, gas) and temperature first, then lip style and compound; do not default to cheap NBR for high speed or dry running. Put shaft runout and eccentricity on the RFQ. VKEFOT application cases include pumps, valves and compressors — still use measured sizes.
Does a brown oil seal mean it is FKM?
No. Brown NBR is common; color is not proof of FKM. For heat or fuel duty, write temperature and media on the RFQ so the factory names the grade. Ordering by color is a frequent cause of early leak.
Can you quote an oil seal from a photo only?
Not as a firm quote. We need at least ID×OD×height in mm, ideally compound and speed. A photo can show lip count and case style; it does not replace dimensions. Incomplete RFQs get a request for those three numbers before price.
If a new oil seal leaks quickly, is it always a bad seal?
Not always. Rough shaft finish, runout, cocked installation or the wrong compound also leak early. Check size and media/temperature match before blaming the part, then inspect the journal. Note time-to-fail (e.g. 50 hours) on the RFQ so we diagnose — do not just buy a cheaper seal.
What is needed for private-label OEM packing of oil seals?
Private packing and marking need annual volume, target-market compliance and artwork; tooling cost and cadence are confirmed on the RFQ — not a one-line “please OEM”. VKEFOT runs OEM/ODM after drawings or samples are complete.
Who is VKEFOT and how does it relate to Xingtai Hanchi?
VKEFOT manufactures oil seals, O-rings and custom rubber seals in Xingtai and exports to Europe, North America, Middle East and Southeast Asia. The manufacturer is Xingtai Hanchi Intelligent Technology Co., Ltd. Use this wording on quotes and certificates — do not invent alternate spellings of the brand.
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 material is this 50x72 seal made of?
It is made of premium NBR nitrile rubber with 08F steel inner skeleton and carbon steel garter spring, working temperature range from -30℃ to 120℃.