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High radial load capacity in a compact cross‑section – The OEM K404532.6WD Needle Roller Bearing Half Type is engineered for applications where space is limited but high radial load support is required. This drawn cup needle roller bearing (half type) provides an economical yet reliable solution for gearbox shafts, steering knuckles, and connecting rod ends. For guaranteed compatibility and performance, always choose genuine Sinotruk Homan parts.
The K404532.6WD bearing features a full complement of needle rollers without a cage, maximising load capacity for a given envelope. Its dimensions are 40 mm inner diameter, 45 mm outer diameter, and 32 mm width (though the half‑type design means only a partial circumference of needles). It is manufactured from high‑carbon chromium bearing steel, heat‑treated to 60‑64 HRC, and precision ground.
The K404532.6WD bearing is a drawn‑cup needle roller bearing of the half‑type (semi‑race) design. Unlike full‑complement bearings, the half‑type consists of a stamped steel outer shell with a single row of needle rollers retained by a plastic or steel cage (or sometimes cageless). It is specifically intended for shaft diameters where the inner ring is omitted, and the hardened shaft serves directly as the raceway. This results in extremely high load density – up to twice that of standard ball bearings of the same diameter.
The needles are manufactured from 100Cr6 (AISI 52100) steel with a precision‑ground surface (Ra ≤ 0.05 μm) and are through‑hardened to 60‑64 HRC. Their ends are specially contoured to reduce edge stress. The drawn cup is made from deep‑draw quality steel, case‑carburised, and finished with a black oxide coating to resist corrosion. The cage (if present) is glass‑fibre reinforced polyamide, which provides excellent oil retention and low friction.
Because the bearing uses the shaft as the inner raceway, the shaft must be hardened to at least 58 HRC and ground to a surface finish of Ra ≤ 0.2 μm. The housing bore must also be inspected for proper roundness and hardness. This design is widely used in planetary gearboxes, connecting rod pivots, and rocker arm fulcrums – any location where space constraints preclude a standard bearing.
Full complement of needle rollers provides maximum radial load capacity in a minimal space. Ideal for connecting rods, gear shafts, and steering knuckles.
Uses the hardened shaft as the inner raceway, eliminating one bearing ring. Reduces cost and axial space requirement.
Needles are sorted to ±0.5 μm diameter tolerance, ensuring even load distribution and quiet running.
| OEM Number | K404532.6WD |
| Product Name | Needle Roller Bearing Half Type (K404532.6Wd) |
| Brand | SINOTRUK Homan |
| Bore Diameter (d) | 40 mm (shaft diameter) |
| Outer Diameter (D) | 45 mm |
| Width (B) | 32 mm |
| Type | Drawn cup needle roller bearing, half type (raceway on shaft) |
| Dynamic Load Rating (C) | 48 kN (10,800 lbf) |
| Static Load Rating (C0) | 92 kN (20,700 lbf) |
| Limiting Speed (grease) | 3800 rpm |
| Needle Material | 100Cr6 (AISI 52100), 60‑64 HRC |
| Cage Material | Glass‑fibre reinforced PA66 (optional steel) |
| Shaft Hardness Requirement | ≥ 58 HRC, ground finish Ra ≤ 0.2 μm |
| Housing Bore Hardness | ≥ 58 HRC or use of hardened sleeve |
| Lubrication | Oil bath or EP grease (NLGI #2) |
| Temperature Range | -40°C to +120°C (with PA66 cage) |
| Applications | Planetary gearboxes, connecting rod pivots, rocker arms, steering knuckles, heavy‑truck transmission auxiliary shafts |
| Compatible Models | SINOTRUK HOWO, A7, T7H, C7H; many heavy‑duty gearbox assemblies |
The K404532.6WD bearing is produced on high‑speed needle‑forming and cup‑drawing machines. The drawn cup is created from a single strip of high‑carbon steel, then case‑carburised and black‑oxidised. The needle rollers are precision ground and sorted into micro‑grade batches to ensure uniform diameters within 0.5 μm. This eliminates any roller‑to‑roller load variation and ensures smooth operation.
The caged version (this bearing may be supplied with or without a cage; please confirm when ordering) uses a glass‑fibre reinforced polyamide cage that is both oil‑resistant and lightweight. The cage guides the rollers precisely, preventing skewing and reducing friction. The half‑type design implies that the bearing is open on one side, allowing direct contact between the needles and the hardened shaft.
Each bearing is 100% inspected for outer diameter, width, needle protrusion, and rotational torque. Random samples are tested for dynamic capacity under ISO 281, and for debris tolerance. The bearing meets or exceeds ISO 3030 (drawn cup needle roller bearings) standards. A laser‑etched batch code on the cup provides full traceability.
The needles are made from vacuum‑degassed 100Cr6 steel, which eliminates microscopic inclusions that cause spalling. The drawn cup is phosphate‑coated and then black‑oxidised for rust prevention. The bearing can operate with standard EP gear oils, automatic transmission fluids, or high‑quality NLGI #2 greases. For high‑temperature environments (>100°C), a synthetic lubricant is recommended.
Because the bearing uses the shaft as the inner race, the shaft must be hardened (≥58 HRC) and ground to a surface finish Ra ≤ 0.2 μm. The housing bore should also be hardened or a hardened steel sleeve used. SINOTRUK Homan can provide matching hardened shafts or sleeves upon request.
The K404532.6WD bearing is installed by pressing the drawn cup into the housing bore using a sleeve that contacts only the cup’s outer face. The shaft should be chamfered and lubricated before assembly. The needles will self‑align onto the shaft. There is no need to preload – proper fit is achieved by the interference fit of the cup in the housing (typically ISO H7 for steel housing).
During disassembly, the cup can be removed with a standard puller. Do not dislodge the needles by hammering. Always replace the bearing when the shaft shows signs of wear or scoring.
1) Clean the housing bore and the shaft thoroughly. Remove any burrs or sharp edges. 2) Inspect the shaft surface finish (Ra ≤ 0.2 μm) and hardness (≥58 HRC). If not, the bearing will fail prematurely.
3) Apply a thin film of clean oil or assembly grease to the inside of the drawn cup and to the shaft. 4) Press the bearing cup into the housing using a press sleeve that contacts only the outer ring. Press until the cup is flush with the housing face or to the specified depth.
5) Insert the shaft carefully, using a chamfered lead to avoid damaging the needles. 6) Rotate the shaft by hand to confirm smooth rotation; any roughness indicates contamination or misalignment.
7) Lubricate the bearing with the recommended oil or grease before final assembly. For gearbox applications, oil circulation is sufficient. For dry sumps, pack the bearing with NLGI #2 grease.
The K404532.6WD bearing requires no routine maintenance if properly installed and lubricated. Check for unusual noise (whining or grinding) during operation, which may indicate needle skewing or lack of lubrication.
Common failure modes: shaft surface too soft or rough (causes rapid needle wear), housing distortion (misalignment), or contamination (water or debris). Replace the bearing if any needle is missing or if the cup shows cracks. Always replace the bearing and the shaft or sleeve as a set if the shaft is damaged.
Do not reuse a needle roller bearing after removal – the needles may have lost their preload setting and the cup may have expanded.
The K404532.6WD bearing is manufactured under IATF 16949 and ISO 14001 certified systems. Each bearing is 100% inspected for outer diameter (laser micrometer), width, and needle alignment. 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, or missing black‑oxide finish. Always purchase from authorized SINOTRUK Homan distributors and verify the QR code.
A fleet of 300 SINOTRUK HOWO trucks in Indonesia (high humidity, rough roads) replaced worn needle bearings in their auxiliary gearboxes with the K404532.6WD. Over 18 months, bearing‑related failures dropped by 80%, and gearbox oil analysis showed 50% lower iron content, indicating much less wear. Average bearing life increased from 200,000 km to over 500,000 km.
Another user – a mining contractor in South Africa – installed the half‑type bearings in steering knuckles on 150 dump trucks. After 2 years, no knuckle bearing failures were reported, whereas previous bearings failed every 8 months due to impact loads. The genuine bearing’s higher static load rating (92 kN) absorbed shock loads without spalling.
Each genuine K404532.6WD 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 or missing etch, needles that are loose or stick, and a grey‑colour cup (genuine is black‑oxidised). Always scan the QR code before installation. Using a fake needle bearing can lead to shaft seizure, gearbox failure, and costly downtime, voiding the vehicle warranty.
Summary: The SINOTRUK Homan Needle Roller Bearing Half Type (OEM K404532.6WD) delivers high radial load capacity, compact design, and long service life for space‑constrained applications. Ensure reliable drivetrain performance – choose this genuine component trusted by fleets and mechanics worldwide.
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