252x300x30mm Wheel Hub Half Shaft Oil Seal | TB Type Iron Shell Skeleton NBR Dust-proof for Heavy

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

• 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

Features & Benefits

• Standard universal size 252x300x30mm, direct interchangeable replacement for heavy truck wheel hub half shaft applications
• Reinforced iron shell skeleton structure, rigid mounting stability and excellent impact resistance for heavy duty conditions
• Premium NBR nitrile rubber double lips, reliable leak-proof and dust-proof dual sealing performance
• Built-in carbon steel garter spring maintains consistent radial preload, adapts to heavy load and high vibration conditions
• Strict dimensional inspection per batch, stable quality consistency for long-term aftermarket replacement
• Factory direct supply from Hebei China, competitive bulk pricing for global distributors and fleet operators
• Stable finished goods inventory, supports fast delivery for urgent repair and maintenance orders
• Flexible customization options including private label and FKM high-temperature material upgrade

Material & 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

Packaging & 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

• 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.
• 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