HK2536-2RS Ultimate Heavy-Duty Needle Roller Bearing – SINOTRUK Homan OEM for Compact High-Load Applications

Compact needle roller bearing with integral sealing – The OEM HK2536-2RS Needle Roller Bearing (25 mm inner diameter, 32 mm outer diameter, 36 mm width) is engineered for applications where space is limited but high radial load capacity is required. This drawn‑cup needle bearing features two integrated rubber seals (2RS), providing excellent contamination protection and grease retention. For guaranteed compatibility and performance, always choose genuine Sinotruk Homan parts.

The HK2536-2RS bearing is manufactured from vacuum‑degassed 100Cr6 (AISI 52100) steel, heat‑treated to 60‑64 HRC, and precision ground. With a full complement of needle rollers, it delivers exceptional radial stiffness and long life in gearbox shafts, connecting rod pivots, and rocker arm fulcrums.

English: Needle Roller Bearing HK2536-2RS

Russian: Игольчатый роликовый подшипник HK2536-2RS

Spanish: Rodamiento de agujas HK2536-2RS

Why the HK2536-2RS Needle Roller Bearing Sets the Standard for Sealed Compact Applications

The HK2536-2RS bearing is a drawn‑cup needle roller bearing with a full complement of needle rollers (cageless design), maximising load capacity for its size. The “2RS” suffix indicates two‑lip rubber seals on both sides, which retain grease and exclude dirt, water, and dust. This makes it ideal for applications where external contamination is a concern – such as steering knuckles, planetary gear sets, and pivot pins in heavy‑truck suspension systems.

The needle rollers are manufactured from vacuum‑degassed 100Cr6 steel, precision ground to a diameter tolerance of ±0.5 μm, and through‑hardened to 60‑64 HRC. The drawn cup is made from deep‑draw quality steel, case‑carburised, and coated with a black‑oxide finish for corrosion resistance. The seals are high‑temperature nitrile rubber (NBR) that withstands 120°C continuous operation and resist oils and greases.

This bearing is designed to operate with the shaft serving as the inner raceway; therefore, the shaft must be hardened to at least 58 HRC and ground to a surface finish Ra ≤ 0.2 μm. The housing bore should be hardened or a hardened steel sleeve used. Proper installation ensures a service life of over 500,000 km in typical on‑highway truck applications.

Complete Technical Specifications – SINOTRUK Homan HK2536-2RS Needle Roller Bearing

Engineering Excellence of the HK2536-2RS Needle Roller Bearing

The HK2536-2RS bearing is manufactured on high‑speed needle forming and cup drawing lines. The cup is drawn from a single strip of high‑carbon steel then case‑carburised to a depth of 0.3‑0.5 mm, producing a hard, wear‑resistant surface while retaining a tough core. The needles are precision ground using centreless grinders and then sorted into sub‑micron groups to ensure uniform diameters within 0.5 μm. This eliminates any roller‑to‑roller load variation and ensures quiet operation.

The two contact seals are moulded from nitrile rubber and pressed into grooves in the cup. They have a low‑friction lip design that contacts the shaft, retaining grease while excluding water and dirt. The seals are assembled with a slight interference fit, providing a grease‑tight seal that can withstand splash‑lubricated environments. The bearing is pre‑greased with a high‑quality lithium EP grease that is oxidation‑resistant and stays in place for the life of the bearing.

Each bearing is 100% inspected for outer diameter, width, needle protrusion, seal integrity, and rotational torque. Random samples are tested for dynamic capacity under ISO 281, and for seal effectiveness under dusty conditions (ISO 281). The bearing meets or exceeds ISO 3030 (drawn cup needle roller bearings) standards. A laser‑etched batch code on the cup provides full traceability.

Superior Material & Contamination Resistance

The needles are made from vacuum‑degassed 100Cr6 steel, which eliminates non‑metallic inclusions that cause spalling. The cup is phosphate‑coated before black‑oxiding for rust prevention. The seals are made from NBR that resists mineral oils, greases, and biodiesel blends (up to B20). The bearing can be used in temperatures from -40°C to +120°C continuously.

Because the bearing is sealed, it can be press‑fitted into a housing and a shaft inserted without additional lubrication. However, for applications with high speed or heavy load, a supplementary oil film from splash lubrication is beneficial.

Easy Installation & Compatibility

The HK2536-2RS is a direct replacement for the original needle bearing in many SINOTRUK Homan assemblies. Installation is performed by pressing the bearing into the housing bore using a press sleeve that contacts only the cup’s outer face. The shaft should be chamfered and lubricated before assembly. Avoid tilting the bearing during press‑in – tilting may damage the seal lips.

The housing bore tolerance should be ISO H7 (hardened steel housing) or N7 for soft housings. If the housing is not hardened, a hardened steel sleeve or a bearing with a thicker cup (special order) is recommended. The shaft should be hardened to at least 58 HRC and ground to a finish Ra ≤ 0.2 μm. Do not use a shaft with scratches or grooves – they will quickly wear the needles and destroy the bearing.

Professional Installation Guide for the HK2536-2RS Needle Roller Bearing

1) Clean the housing bore and the shaft thoroughly. Remove any burrs or sharp edges. 2) Inspect the shaft finish (Ra ≤ 0.2 μm) and hardness (≥58 HRC). 3) Apply a thin film of oil to the housing bore to ease pressing.

4) Use a press sleeve that contacts only the outer cup face. Press the bearing into the housing until it is flush with the housing face or to the specified depth. Do not press beyond the stop shoulder – over‑pressing may distort the cup. 5) Ensure the seals are not damaged during pressing; the seal lips should face inward to contain grease.

6) Insert the shaft slowly, using a chamfered lead to avoid cutting the seals. 7) Rotate the shaft by hand – it should turn smoothly with a slight drag (seal friction). 8) If the bearing is part of a gearbox, ensure proper lubrication (oil splash). For standalone applications, the pre‑grease is sufficient for life.

Maintenance & Troubleshooting Tips

The HK2536-2RS bearing requires no routine maintenance because it is permanently lubricated and sealed. However, if the bearing is part of a dismantled assembly, it must be replaced – never reuse a pressed‑out needle bearing.

Common failure modes: shaft hardness too low (causes shaft scoring and needle wear), misalignment (uneven seal wear), or water ingress (seals damaged). If the bearing makes a grinding noise, check for broken needles. Replace the bearing immediately if any seal is torn or missing. Always replace the shaft if it shows a wear groove deeper than 0.2 mm.

For high‑vibration applications (e.g., rocker arms), inspect the bearing annually for axial play. If end‑play exceeds 0.1 mm, replace the bearing and the shaft.

Quality Certifications & Rigorous Testing – HK2536-2RS

The HK2536-2RS bearing is manufactured under IATF 16949 and ISO 14001 certified systems. Each bearing is 100% inspected for outer diameter (laser micrometer), width, and seal integrity (leak test at 0.2 bar). Random samples undergo endurance life testing (L10 > 4000 hours at rated load), dust contamination testing (500 hours with 50 μm test dust), and corrosion testing (240h salt spray).

The bearing meets ISO 3030 (drawn cup needle roller bearings) and ISO 3096 (needle roller dimensions). A laser‑etched batch code on the cup’s end provides traceability to raw material certificates. Counterfeit bearings often have inconsistent needle diameters, thin cups, missing seals, or a grey‑colour cup (genuine is black‑oxidised). Always purchase from authorized SINOTRUK Homan distributors and verify the QR code.

Real-World Field Performance Data

A fleet of 400 SINOTRUK HOWO trucks in the Middle East (high dust, high temperature) replaced worn needle bearings in their gearbox idle shafts with the HK2536-2RS. Over 2 years, gearbox failures due to bearing seizure dropped by 85%, and bearing life increased from 150,000 km to over 600,000 km. The sealed design effectively blocked fine sand ingress.

Another user – a European bus manufacturer – installed the sealed needle bearings in their steering knuckles on 1,200 vehicles. After 5 years, fewer than 0.5% of bearings showed any sign of wear, demonstrating the effectiveness of the 2RS seals in preventing water and road salt ingress.

Packaging, Anti-Counterfeit & Genuine Identification

Each genuine HK2536-2RS needle roller bearing is packed in a sealed anti‑rust pouch inside a SINOTRUK Homan branded carton. The box includes a QR code and a hologram sticker. The bearing cup has the OEM number laser‑etched on its end face, and the seals are a distinctive orange‑brown colour (Viton or high‑grade NBR).

Counterfeit bearings often have black seals, a rough or missing etch, and needles that are loose or fall out. The genuine bearing rotates smoothly with a consistent seal drag. Always scan the QR code before installation. Using a fake needle bearing can lead to shaft seizure, gearbox failure, and costly downtime – and will void the vehicle warranty.

Summary: The SINOTRUK Homan Needle Roller Bearing (OEM HK2536-2RS) delivers high radial load capacity, integral sealing, and long service life for space‑constrained applications. Ensure reliable drivetrain and steering performance – choose this genuine sealed needle bearing, trusted by fleets and mechanics worldwide.