252x300x30mm TB Wheel Hub Half Shaft Oil Seal NBR for Heavy Trucks
252×300×30mm TB type iron shell skeleton oil seal, made of premium NBR nitrile rubber with double lip design and built in garter spring. Leak proof and dust proof high performance aftermarket replacement, specially designed for heavy truck wheel hub half shaft sealing applications. Factory direct supply from China with stable bulk stock, ideal for truck parts distributors, professional repair workshops, fleet maintenance operators and cross border wholesale procurement.
Tags: 252x300mm oil seal, iron shell skeleton oil seal, heavy truck half shaft seal, TB type wheel hub seal, NBR leak proof seal, dust proof truck oil seal, heavy duty wheel hub seal, aftermarket truck axle seal
Product photos
Key specs: Inner diameter mm: 252 | Outer diameter mm: 300 | Height mm: 30 | Material: NBR | Spec & Model: ID 252mm × OD 300mm × Thickness 30mm | Spec & Model: NBR nitrile rubber sealing lips + Iron shell skeleton outer case + Carbon steel garter spring | Spec & Model: TB type double-lip metal-cased seal | Spec & Model: Universal aftermarket replacement part
Inner diameter mm: 252
Outer diameter mm: 300
Height mm: 30
Material: NBR
Spec & Model: ID 252mm × OD 300mm × Thickness 30mm
Spec & Model: NBR nitrile rubber sealing lips + Iron shell skeleton outer case + Carbon steel garter spring
Spec & Model: TB type double-lip metal-cased seal
Spec & Model: Universal aftermarket replacement part
Spec & Model: Heavy truck wheel hub half shaft sealing
Size: ID 252mm × OD 300mm × Thickness 30mm
Material: NBR nitrile rubber sealing lips + Iron shell skeleton outer case + Carbon steel garter spring
Structure: TB type double-lip metal-cased seal
Technical summary
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Spec
Value
Size
ID 252mm × OD 300mm × Thickness 30mm
Material
NBR nitrile rubber sealing lips + Iron shell skeleton outer case + Carbon steel garter spring
This 252×300×30mm iron shell skeleton oil seal is a high performance heavy duty sealing solution specially developed for heavy truck wheel hub half shaft systems, serving as a direct aftermarket replacement for same size bore axle applications across various domestic and imported heavy truck models. As a classic TB type wheel hub seal, it features a rigid iron shell skeleton outer case for secure press fit mounting and structural stability, paired with precision machined NBR double sealing lips. The primary inner lip delivers reliable leak proof performance, effectively retaining hub gear oil and bearing grease inside the assembly, while the secondary outer lip provides dust proof protection, blocking road dust, mud, grit and splash water from invading the bearing chamber. A built in carbon steel garter spring maintains consistent radial preload on the shaft surface, even under heavy load vibration and long distance highway operation, greatly extending the service life of wheel hub bearings and half shaft components. This 252x300mm oil seal is produced with strict dimensional tolerance control and mature vulcanization technology, matching standard industry installation dimensions for direct fit without modification. As a professional heavy duty wheel hub seal manufacturer based in Hebei, China, we maintain stable bulk inventory to support fast delivery and large volume procurement for global truck aftermarket channels. Core value for global buyers Universal standard size for most heavy truck half shaft applications, direct drop in replacement Robust iron shell skeleton structure with excellent impact resistance and mounting stability Premium NBR compound formulation, outstanding oil resistance and wear resistance for long service life Factory direct bulk pricing, cost effective for large scale sourcing and fleet maintenance
Material and process
Material ：Premium grade NBR (nitrile butadiene rubber) sealing lips, cold rolled iron shell skeleton outer case, carbon steel garter spring Structure ：TB type double lip metal cased rotary shaft oil seal (iron shell skeleton type) Hardness ：70±5 Shore A Key performance ：Leak proof, dust proof, oil resistant, wear resistant, anti vibration, anti aging Working temperature range: 30℃ +120℃ (NBR version) Manufacturing process Integrated vulcanization bonding between rubber lip and iron shell skeleton Precision grinding of sealing lip edge for uniform contact pressure with shaft Full dimensional inspection per production batch before shipment Quality control aligned with commercial truck aftermarket part standards Upgrade option ：FKM (fluoroelastomer) version available for higher temperature working conditions
Application and compatibility
Product Type ：Universal aftermarket TB type iron shell skeleton oil seal for heavy duty vehicles Core dimensions ：ID 252mm × OD 300mm × Thickness 30mm Compatible fluids: Hub gear oil, wheel bearing grease, drive axle lubricants, general chassis lubricants Typical applications Heavy duty commercial truck rear wheel hub half shaft sealing Large truck drive axle wheel hub oil sealing Semi trailer axle hub sealing with same bore size Heavy industrial equipment rotating shaft sealing Aftermarket repair and replacement service scenarios Suitable for ：Truck parts distributors, independent heavy vehicle repair workshops, fleet maintenance centers, trailer parts suppliers, cross border auto parts traders Buyer notice ：This is a universal size aftermarket replacement part. Please confirm shaft diameter, housing bore size and seal thickness before ordering. Dimension mismatch will cause lubricant leakage after installation.
Selection guide
Selection Guide 1. Confirm shaft ID 252mm, housing OD 300mm, required thickness 30mm and TB iron shell skeleton double lip structure. 2. Standard NBR version for normal truck operating conditions ( 30℃ 120℃); select FKM upgrade for high temperature and chemically aggressive environments. 3. For bulk repair or fleet maintenance projects, contact us for exclusive volume pricing. Installation Steps Surface Preparation Thoroughly clean the hub housing bore and shaft surface, remove old seal residue, dirt, rust and metal burrs. Pre lubrication Apply matching bearing grease or gear oil evenly on the sealing lip and shaft mating surface. Dry installation is strictly prohibited as it will cause premature lip wear and failure. Orientation Confirmation The main sealing lip faces the lubricant cavity side; the dust proof lip faces the wheel outer side. Reverse installation will cause oil leakage and loss of dust protection. Press fit Installation Use a dedicated press sleeve tool to press the seal in evenly and vertically. Never strike the iron shell directly to avoid seal deformation and lip tearing. Post installation Check Ensure the seal sits fully flush inside the housing bore without tilt or offset. Inspect the sealing lip for nicks, scratches and deformation. Function Test Manually rotate the wheel hub assembly to confirm smooth rotation without abnormal binding resistance.
Packaging and delivery
Inner packaging ：Each piece individually packed in anti dust poly bag to protect the sealing lip from scratches and contamination. Outer packaging ：Standard export corrugated carton with shock proof padding. Custom packaging with private label available. Packing quantity ：Adjustable per bulk order requirements. Lead time Stock items ：Ship within 7 15 working days after payment Custom private label / packaging orders: 25 40 working days Large volume bulk orders: Lead time to be confirmed based on quantity Custom services ：Private label printing, custom packaging design, consolidated shipping for mixed SKUs Shipping terms ：EXW, FOB, CIF available Export documents ：Commercial invoice, packing list, certificate of origin, dimensional test report available on request
There are only competing products—OEM and model—but not your part number.
Can we use them as a reference for selection?
Sure. Please include the competing products/OEM model, key dimensions (ID × OD × height, in mm), and operating conditions (medium, temperature, pressure, rotational speed) to the inquiry form, and we will match them with equivalent specs items in our catalog.If dimensions are unavailable, please send model and photos/drawing first, and we will confirm the details. The final model selection will be based on the confirmation of drawing and operating conditions, and the official quotation will be subject to the written quotation order.
Does it support OEM/ODM along with privatization of packaging and tagging?
We support performing OEM/ODM in accordance with drawing/sample, as well as packaging and marking customization within the agreed upon scope.Please provide details on the target market’s compliance requirements and estimated annual volume. During the RFQ phase, we will confirm process feasibility, tooling costs, and mass production cycle time.
What is 252x300x30mm iron shell skeleton oil seal used for?
It is specially designed for heavy truck wheel hub half shaft sealing, retaining gear oil and bearing grease while blocking road dust, mud and splash water.
What type of seal is this 252x300mm wheel hub seal?
It is a TB type iron shell skeleton double lip oil seal, with exposed metal outer case and NBR sealing lips, built for heavy duty automotive sealing applications.
What material is this heavy truck half shaft seal made of?
Made of premium grade NBR nitrile rubber sealing lips with cold rolled iron shell skeleton outer case and carbon steel garter spring, working temperature 30℃ to +120℃.
Is this 252x300x30mm seal leak-proof and dust-proof?
Yes, it features a double lip design: the inner lip provides leak proof oil sealing, and the outer lip delivers dust proof protection against road contaminants.
Is this a universal size oil seal for heavy trucks?
Yes, it is a standard industry universal size, direct drop in replacement for same bore heavy truck wheel hub half shaft applications.
What is your typical MOQ for this oil seal?
Depends on spec; typically 100 5,000 pcs. Sample orders are supported for quality evaluation before bulk purchase.
What is the lead time for stock orders?
Stock items are shipped within 7 15 working days after payment. Custom orders take 25 40 working days.
What trade terms do you offer?
We offer EXW, FOB and CIF trade terms to support cross border procurement.
Do you have a high temperature version of this seal?
Yes, we offer FKM fluoroelastomer upgrade version for higher temperature working conditions.
Where is this iron shell skeleton oil seal manufactured?
It is factory direct manufactured in Hebei, China, with mature heavy truck seal supply chain and stable bulk production capacity.
