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When your shaft assembly demands maximum radial load capacity in the smallest possible envelope, standard ball bearings simply don't cut it. Engineers, maintenance technicians, and serious DIYers working on gearboxes, motors, pumps, and power tools need a bearing that fits flush, stays put, and handles real cyclic loads without adding bulk. The HK series drawn cup needle roller bearing is the go-to solution for exactly these applications.
These drawn cup needle roller bearings feature a thin-walled, precision-stamped steel outer cup with a full complement of needle rollers retained inside. Inner diameter (ID) ranges from 20 mm (0.787 in) to 60 mm (2.362 in), outer diameter (OD) from 26 mm to 68 mm, and heights from 10 mm to 38 mm depending on the selected size variant. The cup wall is typically 1.0–2.0 mm thick, keeping the overall cross-section minimal while maintaining structural rigidity.
Typical use cases include automotive transmission shafts and rocker arm pivots, industrial gearbox intermediate shafts, power tool spindle assemblies, and agricultural equipment linkage pins — anywhere a drawn cup needle roller bearing for shaft ID 20–60 mm is required to handle oscillating or rotating radial loads in a space-constrained bore.
| Bearing Series | HK (Drawn Cup Needle Roller) |
|---|---|
| Inner Diameter (ID) | 20 mm – 60 mm (0.787 in – 2.362 in) |
| Outer Diameter (OD) | See variant options |
| Height (Width) | See variant options |
| Cup Wall Thickness | Typically 1.0 – 2.0 mm |
| Roller Type | Full complement needle rollers |
| Outer Cup Material | Case-hardened stamped steel |
| Needle Roller Material | Bearing steel (through-hardened) |
| Surface Finish (Raceway) | Ground, Ra ≤ 0.4 µm (typical) |
| Design Type | Open one end (shaft pass-through) |
| Lubrication | Grease or oil (not pre-lubricated) |
| Operating Temperature | Typically –20 °C to +120 °C |
| Pack Quantity Options | 1 / 2 / 4 / 5 / 8 / 10 / 20 pcs |
| Shaft Hardness Requirement | HRC 58–64 recommended |
| Shaft Surface Finish | Ra ≤ 0.4 µm recommended |
Match the bearing ID to your shaft diameter and the OD to your housing bore. The height (width) determines the axial space available. Use the Size (ID × OD × Height) variant selector above to find your exact combination. If your shaft is, for example, 25 mm, select any variant with an ID of 25 mm and confirm the OD fits your housing bore.
No inner ring is required when the shaft surface is hardened to HRC 58–64 and ground to Ra ≤ 0.4 µm. The needle rollers run directly on the shaft surface. If your shaft does not meet these hardness requirements, a separate inner ring (HK inner ring or equivalent) should be used to prevent premature wear.
HK series bearings are designed for radial loads only. They are not suitable for axial (thrust) loads. The full complement needle design provides a high radial load capacity relative to the bearing's cross-sectional size, making them well-suited for oscillating and rotating shaft applications with moderate to heavy radial forces.
Standard HK drawn cup needle roller bearings are made from carbon bearing steel and are not inherently corrosion-resistant. For environments with moisture or mild chemical exposure, apply a compatible grease with corrosion-inhibiting additives and consider re-lubrication intervals appropriate to the environment. For highly corrosive environments, contact us to confirm suitability.
Press the bearing into the housing bore using a suitable press tool or bearing driver that contacts only the outer cup face — never strike the needle rollers directly. Ensure the housing bore is clean, within tolerance, and lightly oiled before installation. The bearing should be pressed in squarely to avoid cocking. Apply grease to the needle rollers and shaft before inserting the shaft.
Yes. HK series drawn cup needle roller bearings are widely used in automotive rocker arm pivots, transmission intermediate shafts, and differential assemblies. Confirm the ID, OD, and height match your OEM specification before ordering. If you need to verify fitment for a specific vehicle application, contact us with your make, model, and component details.
All pack quantities contain the same bearing in the same size. Larger packs offer a lower per-unit cost and are useful for workshop stock, production runs, or applications requiring multiple bearings (e.g., both sides of a shaft or multiple cylinders). Select the pack quantity that matches your project needs using the Pack Quantity (pcs) option above.
