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When your assembly demands maximum load capacity in a minimal footprint, standard ball bearings simply don't cut it. Engineers, maintenance technicians, and DIY builders working on motors, gearboxes, pumps, and power tools rely on drawn cup needle roller bearings to handle heavy radial loads where space is at a premium. HK series bearings are the go-to choice when shaft diameter and housing bore must stay small without sacrificing performance.
These HK series drawn cup needle roller bearings feature a thin-walled, deep-drawn steel outer cup with a full complement of needle rollers retained inside. Available models span inner diameters from 7 mm to 8 mm (~0.28–0.31 in), outer diameters from 12 mm to 14 mm (~0.47–0.55 in), and widths from 8 mm to 12 mm (~0.31–0.47 in). The drawn cup shell is manufactured from case-hardened steel, and the needle rollers are precision-ground for consistent contact across the raceway.
Typical use cases include replacing worn bearings in small electric motors and servo drives, rebuilding automotive accessory components such as rocker arm pivots and balance shaft assemblies, and fitting into compact industrial gearboxes or textile machinery where a standard ball bearing housing would not fit. The HK designation follows ISO 3245 geometry, making these bearings interchangeable with equivalents from major bearing manufacturers worldwide.
The thin-walled outer cup is deep-drawn from sheet steel and case-hardened, allowing the bearing to fit directly into a bored housing without a separate outer ring — saving radial space in tight assemblies.
Maximizes the number of rolling elements in contact with the shaft, delivering a higher radial load rating relative to the bearing's cross-section compared to caged designs of the same envelope.
Six distinct models (inner diameter 7–8 mm, outer diameter 12–14 mm, width 8–12 mm) let you source the exact geometry your application requires without ordering from multiple suppliers.
Available in packs of 1, 3, 5, 10, or 20 pieces per order, so you can match your purchase to a single repair job or a planned maintenance stock without over-ordering.
Conforms to the internationally standardized HK series dimensional envelope, ensuring cross-compatibility with equivalent bearings from other manufacturers and simplifying sourcing for repeat replacements.
The outer cup and needle rollers are produced from case-hardened steel, providing a hard wear surface with a tough core — suited for oscillating and rotating shaft applications under moderate-to-heavy radial loads.
| Bearing Series | HK (Drawn Cup Needle Roller) |
|---|---|
| Inner Diameter (d) | 7 mm / 8 mm (0.28 in / 0.31 in) — see variant options |
| Outer Diameter (D) | 12 mm / 14 mm (0.47 in / 0.55 in) — see variant options |
| Width (B) | 8 mm / 9 mm / 10 mm / 12 mm — see variant options |
| Available Models | HK 7×12×9, HK 8×12×8, HK 8×12×10, HK 8×12×12, HK 8×14×10, HK 8×14×12 |
| Roller Type | Full complement needle rollers |
| Outer Cup Material | Case-hardened drawn steel |
| Dimensional Standard | ISO 3245 |
| Load Direction | Radial |
| Quantity per Pack | 1 / 3 / 5 / 10 / 20 pcs — see variant options |
| Weight per Piece | See variant options |
Match the bearing's inner diameter (d) to your shaft diameter and the outer diameter (D) to your housing bore. Then confirm the width (B) fits within your available axial space. For example, if your shaft is 8 mm and your housing bore is 12 mm with 10 mm of axial room, select the HK 8×12×10 model. Always measure your existing bearing or housing before ordering.
Both share an 8 mm inner diameter, but the HK 8×14 series has a 14 mm outer diameter versus 12 mm for the HK 8×12 series. The larger outer diameter of the HK 8×14 allows for a longer needle roller, which generally results in a higher radial load rating. Choose HK 8×14 when your housing bore accommodates 14 mm and you need greater load capacity; choose HK 8×12 when the housing bore is limited to 12 mm.
No. HK series drawn cup needle roller bearings are designed exclusively for radial loads. They cannot support axial loads on their own. If your application involves combined radial and axial loading, you will need to pair these bearings with a separate thrust bearing or use a different bearing type such as a combined needle roller and thrust bearing assembly.
The outer cup and needle rollers are made from case-hardened steel, which provides good wear resistance but limited corrosion resistance in wet or chemically aggressive environments. For applications exposed to moisture, apply a compatible bearing grease with corrosion-inhibiting properties and consider regreasing intervals appropriate to your operating conditions. For highly corrosive environments, stainless steel needle roller bearings would be a more suitable choice.
Yes. These bearings conform to the ISO 3245 dimensional standard for HK series drawn cup needle roller bearings. This means they are dimensionally interchangeable with HK series bearings from other manufacturers that follow the same standard. Always verify the d × D × B dimensions match your existing bearing before installation.
For a single repair, a pack of 1 or 3 pieces is typically sufficient. If you are servicing multiple units or want to keep spares on hand, packs of 5 or 10 offer a lower per-piece cost. For workshop or production environments with regular bearing replacements, the 20-piece pack provides the best value per unit. Select your quantity using the QTY(pcs) option above.
HK series drawn cup needle roller bearings are typically lubricated with grease or oil depending on the application speed and temperature. For moderate-speed, moderate-temperature applications, a lithium-based NLGI 2 grease is a common choice. For high-speed applications, a low-viscosity oil lubrication system may be more appropriate. Consult your equipment's service manual for the manufacturer's recommended lubricant specification.
