Sino Truck Oil Seal Size Chart and Replacement Guide

When I help buyers identify a Sino Truck oil seal, I start with the seal marking, the original part number, or three measured dimensions: shaft diameter, housing bore diameter, and seal width. A typical oil seal size is written in the format shaft diameter × housing bore diameter × width, such as 90 × 110 × 12 mm; this is an example of the format, not a universal Sino Truck fitment. Because truck models, axles, hubs, transmissions, and production years can use different seals, I recommend confirming the application and measurements before ordering.

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This guide explains how I read an oil seal size, how I build a reliable replacement specification, and what information I need to quote the correct Sino Truck oil seal. It is intended for purchasing teams, maintenance technicians, distributors, and aftermarket parts businesses working with TEBIETE as a seals supplier.

Quick Size Reference for Sino Truck Oil Seals

I use the following chart as a measurement and quotation framework. It does not replace an OEM catalogue or a verified part number, because the same truck family may contain different seals in the wheel hub, differential, gearbox, engine, or other assemblies.

For a real order, I treat the example dimensions as a format only. The correct size must come from the old seal marking, an approved technical drawing, a verified truck or assembly reference, or accurate measurements taken from the shaft and housing. If the removed seal is damaged, the remaining dimensions should be checked against the assembly rather than estimated from appearance.

What a Sino Truck Oil Seal Does

A Sino Truck oil seal is designed to retain lubricant around a rotating or reciprocating shaft while helping prevent dust, water, and other contaminants from entering the assembly. In practical terms, the seal supports oil retention in areas such as wheel hubs, axles, differentials, gearboxes, engines, and hydraulic-related mechanisms, depending on the vehicle design. The exact sealing function depends on the lip profile, shaft condition, lubricant, speed, temperature, and installation arrangement.

Common replacement designs may include a primary oil-sealing lip, a secondary dust lip, a garter spring, a metal reinforcing case, or a rubber-covered outer diameter. I do not select a construction only by size, because two seals with the same nominal dimensions can have different materials or lip designs for different operating conditions.

How I Identify the Correct Replacement Size

Step 1: Record the Application

I first record the truck model, production information when available, and the exact assembly location. “Rear axle seal” is useful, but “rear axle input seal” or “rear wheel hub seal” is more precise because one axle system may contain multiple oil seals. I also ask whether the replacement is for routine maintenance, leakage repair, a rebuilt assembly, or a new production project.

Step 2: Check the Existing Seal

Many oil seals have size markings, manufacturer codes, or application numbers molded, stamped, or printed on the seal body. I clean the part carefully and photograph every visible marking before removing it, because heat, oil, and handling can make characters difficult to read. A marking such as 90 × 110 × 12 mm may describe the basic dimensions, while an additional code may identify the profile or material.

Step 3: Measure the Three Main Dimensions

If the marking is missing, I measure the shaft diameter, housing bore diameter, and seal width with suitable measuring tools. I take more than one reading and inspect the shaft sleeve and bore for wear, corrosion, scoring, or distortion, because a correct nominal size cannot compensate for a damaged sealing surface. I record the measurements in millimetres and distinguish between the original seal dimensions and the actual assembly dimensions.

Step 4: Confirm Material and Profile

I then confirm the lubricant, operating temperature, shaft speed, contamination level, and exposure to water or dust. NBR is commonly considered for many general oil-sealing applications, while FKM may be considered where higher temperature or chemical resistance is required; the final choice should be based on the actual lubricant and working conditions. If the truck operates in mud, water, construction areas, or other severe environments, a dust lip or a more protective design may be relevant.

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Step 5: Verify Before Ordering

Before releasing a purchase order, I compare the measured size with the part number, drawing, old seal profile, and supplier quotation. I also confirm the installation direction, spring position, sealing lip orientation, and whether a wear sleeve or separate spacer is part of the assembly. When the information is incomplete, I request a drawing or sample rather than treating an approximate dimension as a confirmed fitment.

Materials and Design Options

The material should be selected by service conditions rather than by price alone. NBR can be a practical option for many mineral-oil applications, but compatibility still depends on the specific lubricant, temperature, and operating environment. FKM may be considered for applications requiring greater resistance to heat or certain fluids, while other elastomers may be appropriate for specialized conditions after technical review.

The case design also affects installation and sealing performance. A metal-cased seal can provide a defined outer structure, while a rubber-covered outer diameter may help accommodate certain housing conditions; neither design is automatically correct for every Sino Truck assembly. I review the original construction, housing material, interference requirements, and contamination exposure before recommending a replacement profile.

Common Mistakes When Replacing a Sino Truck Oil Seal

• Ordering by truck name only: A vehicle brand or model does not always identify the exact axle, hub, gearbox, or production variation.
• Using outside diameter as the shaft size: The three dimensions must be recorded in the correct order: shaft diameter, housing bore, and width.
• Ignoring the old seal profile: A dust lip, spring, flange, or metal case may be important to the original design.
• Installing over a damaged shaft: Grooves or corrosion can cause leakage even when the replacement seal has the correct dimensions.
• Forcing the seal into place: Excessive impact or uneven pressure can deform the case and sealing lip.
• Skipping cleanliness: Dirt, metal particles, and old gasket material can damage the lip during installation.

I recommend cleaning the bore and shaft, checking the lip direction, applying a suitable film of lubricant where permitted, and pressing the seal evenly with the correct installation tool. The seal should normally be seated to the position specified by the assembly design, not simply driven as far as possible. If the housing or shaft is worn, the repair plan may need additional parts or machining rather than a different seal size.

How to Evaluate a Sino Truck Oil Seal Supplier

Technical Confirmation

I look for a supplier that can confirm dimensions, profile, material, application, and packaging details in writing. A capable supplier should be willing to review drawings, photographs, samples, and old markings instead of quoting only from a vague vehicle description. For repeat business, consistent part-number control and revision management are also important.

Commercial and Supply Support

Before ordering, I confirm minimum order quantity, sample availability, production lead time, packaging, inspection documents, and shipping terms. Lead time can vary according to tooling, material availability, order quantity, and production scheduling, so I prefer a written estimate rather than an unsupported fixed promise. For distributors, I also check whether labels, cartons, barcode information, and mixed-size shipments can be discussed in advance.

At TEBIETE, I support Sino Truck oil seal sourcing by reviewing the buyer’s dimensions, application details, drawings, and samples before preparing a quotation. Our role as a seals manufacturer and exporter is to help match the required size and construction with the intended assembly, while keeping uncertain information clearly identified. For custom or repeat requirements, I can also discuss sample confirmation, packaging requirements, and production coordination.

Key Takeaways for Buyers and Maintenance Teams

• Read the size as shaft diameter × housing bore diameter × width.
• Use the example 90 × 110 × 12 mm only to understand the format, not as a confirmed Sino Truck fitment.
• Confirm the exact assembly location, old seal marking, profile, material, and working conditions.
• Inspect the shaft, sleeve, and housing before installing a replacement.
• Ask the supplier to verify incomplete information before production or bulk purchasing.

Conclusion: How to Order the Right Sino Truck Oil Seal

The safest way to identify a Sino Truck oil seal is to combine the application reference with the three core dimensions and the original seal construction. I do not recommend choosing a replacement from the truck name alone, because different assemblies may require different sizes, materials, and lip profiles. A confirmed part number, readable marking, technical drawing, or measured sample provides a stronger basis for selection.

As your next step, prepare the truck and assembly information, photograph the old seal, measure the shaft, bore, and width, and note the lubricant and operating environment. Send these details to TEBIETE for a technical review and quotation, especially when the original seal is damaged or the application involves water, dust, high temperature, or a worn shaft. This process helps reduce incorrect orders and gives your team a clearer path from size identification to reliable replacement.

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