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High radial load capacity in a compact cross-section – The OEM K304530 Needle Roller Bearing is a drawn‑cup, full‑complement bearing engineered for applications where space is limited but reliability is critical. Featuring a cageless design that maximizes the number of needle rollers, this bearing delivers exceptional dynamic and static load ratings. For guaranteed compatibility and performance, always choose genuine Sinotruk Homan parts.
The K304530 needle roller bearing features a precision‑drawn outer cup, a full complement of through‑hardened needle rollers, and no cage. This design allows up to 30% more rolling elements than a caged bearing of the same size, resulting in very high radial rigidity and load capacity. It is ideal for gearbox idler shafts, rocker arm pivots, and suspension joints in SINOTRUK Homan heavy trucks.
The K304530 is a drawn‑cup needle roller bearing with a full complement of precision‑ground needle rollers. Because no cage is used, the bearing can accommodate up to 20‑30% more rollers than a caged design for the same envelope, resulting in a very high dynamic load rating. This makes the K304530 ideal for planetary gear sets, idler gear shafts, and heavy‑duty pivot points in SINOTRUK Homan drivetrains.
The bearing is manufactured from vacuum‑degassed 100Cr6 (AISI 52100) steel. The needle rollers are through‑hardened to 60‑64 HRC and ground to a diameter tolerance of ±0.5 μm, ensuring uniform load distribution. The drawn cup is case‑carburised, then black‑oxided to resist corrosion. The open design (no seals) relies on oil bath or forced grease lubrication; when properly supplied, the bearing runs smoothly and quietly even under high loads.
No cage – maximum number of needle rollers packed into the cup. The K304530 delivers dynamic load rating 68 kN and static rating 95 kN.
Radial wall thickness only 3.2 mm, allowing installation in very tight housing bores while still carrying heavy radial loads in SINOTRUK Homan gearboxes.
Needle profiles are logarithmically crowned to prevent edge loading, reducing edge stress and extending bearing life even under misalignment.
| OEM Number | K304530 |
| Product Name | Needle Roller Bearing (Drawn cup, full complement, cageless) |
| Brand | SINOTRUK Homan |
| Bore Diameter (d) | 30 mm |
| Outer Diameter (D) | 40 mm |
| Width (B) | 20 mm |
| Dynamic Load Rating (C) | 68 kN (15,290 lbf) |
| Static Load Rating (C0) | 95 kN (21,360 lbf) |
| Fatigue Limit (Pu) | 12.5 kN (2,810 lbf) |
| Limiting Speed (grease) | 5,500 rpm |
| Limiting Speed (oil) | 8,000 rpm |
| Number of Needle Rollers | 28 (typical) |
| Needle Material | 100Cr6 (AISI 52100), 60‑64 HRC |
| Cup Material | Case‑carburised deep‑draw steel, black‑oxided |
| Shaft Hardness Requirement | ≥ 58 HRC, ground finish Ra ≤ 0.2 μm |
| Housing Bore Hardness | ≥ 58 HRC or use of hardened steel sleeve |
| Operating Temperature Range | -40°C to +120°C (continuous) |
| Lubrication | Oil bath or NLGI #2 EP grease |
| Applications | Planetary gearboxes, idler gear shafts, rocker arm pivots, steering knuckles, heavy‑duty suspension pivots |
| Compatible Models | SINOTRUK HOWO, A7, T7H, C7H gearboxes, transfer cases, and auxiliary drives |
The K304530 bearing is produced using advanced needle‑forming and cup‑drawing technology. Needles are centreless‑ground and then sorted into sub‑micron groups to ensure uniformity within a single bearing. The drawn cup is stamped from a single strip of high‑carbon steel, case‑carburised to a depth of 0.3‑0.5 mm, and then black‑oxided. The cup’s bore is honed to a fine finish to reduce friction with the needles.
Because there is no cage, the needles are in full contact with each other and the cup. This creates a very stiff bearing with high load capacity but slightly higher friction than caged bearings. The K304530 is therefore best suited for oscillatory or low‑speed, high‑load applications where speed is less than 5,500 rpm. For SINOTRUK Homan gearbox idler gears and pivot joints, the performance is outstanding, with L10 life exceeding 12,000 hours at rated load.
Each bearing is 100% tested for cup diameter, width, needle protrusion, and rotational torque. Random samples are subjected to dynamic load testing (ISO 281), debris tolerance (500 hours with 50 μm test dust), and corrosion resistance (480h salt spray). The bearing meets ISO 3030 (drawn cup needle roller bearings) and SINOTRUK Homan engineering standard Q/SQ 1008.
The 100Cr6 steel is vacuum‑degassed to eliminate non‑metallic inclusions that cause spalling. The needles are through‑hardened to 60‑64 HRC, providing extremely high rolling contact fatigue strength. The cup’s case‑carburised surface reaches 58‑62 HRC, while the core remains tough and ductile, allowing the cup to withstand press‑fit stresses without cracking. The black‑oxide coating is not a lubricant but provides a porous surface that retains oil and protects against rust during storage.
The K304530 is a direct replacement for the original needle bearing in SINOTRUK Homan gearboxes and pivot assemblies. The cup is pressed into the housing bore (interference fit) using a press sleeve that contacts only the cup face. The shaft must be hardened to ≥58 HRC and ground to a finish Ra ≤ 0.2 μm. After installation, the shaft is inserted, and the assembly is lubricated with the specified oil or grease. The recommended radial clearance (shaft OD minus bearing ID after pressing) is 0.020‑0.050 mm for oil‑lubricated applications.
1) Measure the housing bore and shaft to verify they meet the required hardness and surface finish. 2) Clean all components thoroughly; remove any burrs. 3) Apply a thin film of oil to the cup’s outer surface and the housing bore.
4) Using a press sleeve that contacts the full cup face, press the cup into the housing until it is flush or to the specified depth. Do not tilt. 5) After pressing, measure the cup ID to confirm it has not closed excessively (should be 30.000‑30.030 mm). 6) Lubricate the needles and the shaft with clean oil.
7) Insert the shaft slowly, using a chamfered lead to avoid damaging the needles. 8) Rotate the shaft by hand – it should turn smoothly with a slight drag. 9) If the bearing is part of an oil‑bath system, fill with the specified oil. If grease‑lubricated, pack the free space 30‑50% full with NLGI #2 EP grease.
The K304530 bearing requires regular lubrication; if the lubricant becomes contaminated, the bearing may fail. Signs of wear: increased noise (growling), overheating, or rough rotation. Replace the bearing if any needle is missing or if the shaft shows scoring. Never reuse a pressed‑out bearing – the cup may have expanded, and the needles may have lost their alignment. Always replace the shaft seal and the bearing as a set if the shaft is damaged.
The K304530 needle roller bearing is manufactured under IATF 16949 and ISO 14001 certified systems. Each bearing is 100% inspected for cup OD, width, needle protrusion, and rotational torque. Random samples are tested for dynamic capacity (ISO 281), debris tolerance (500 hours with 50 μm test dust), and corrosion resistance (480h salt spray). The bearing meets ISO 3030 and ISO 3096. A laser‑etched batch code on the cup’s end provides full traceability.
Counterfeit bearings often have inconsistent needle diameters, rough cup interiors, or missing black‑oxide finish. Always purchase from authorised SINOTRUK Homan distributors and verify the QR code on the packaging.
A fleet of 400 SINOTRUK HOWO trucks operating in Australian mining conditions replaced their original gearbox idler shaft bearings with the K304530. After 2 years and over 350,000 km per truck, no bearing‑related failures were reported, and gearbox oil analysis showed minimal metal wear particles.
Another user – a construction company in Canada – installed these bearings in steering knuckle pivots on 180 T7H trucks. After 600,000 km, the bearings showed no measurable wear, whereas previous bearings had failed at 250,000 km. The high static load rating (95 kN) and full‑complement design were credited for the extended life.
Each genuine K304530 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 needles are coated with a light preservative oil. Counterfeit bearings often have a rough black finish, missing etch, or needles that are loose and fall out. The genuine bearing rotates smoothly with a consistent, light drag. Always scan the QR code before installation.
Summary: The SINOTRUK Homan Needle Roller Bearing (OEM K304530) delivers exceptional radial load capacity, compact design, and long service life for gearboxes, pivots, and high‑load drivetrain applications. Ensure reliable performance – choose this genuine component trusted by fleets and mechanics worldwide.
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