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When space is tight but load demands are high, engineers and maintenance professionals often struggle to find bearings that fit confined housings without sacrificing radial load capacity. HK needle roller bearings are the go-to solution for applications where a full-complement rolling element is needed in a minimal envelope. This listing covers the HK series drawn cup needle roller bearings with inner diameters from 10mm to 20mm (approximately 0.39 in to 0.79 in), spanning models HK1012 through HK2020.
Each bearing consists of a thin-walled, drawn steel outer cup and a complement of needle rollers retained within. The outer cup diameter (OD) ranges from approximately 14mm to 28mm (0.55 in to 1.10 in), and the bearing height (width) ranges from approximately 10mm to 25mm (0.39 in to 0.98 in) depending on the selected size. The steel construction provides solid radial rigidity suited to oscillating and rotating shaft applications.
HK drawn cup needle roller bearings are widely used in automotive transmission components, power tool gearboxes, and industrial machinery where a shaft must rotate within a housing bore without a separate inner ring. They are also common in two-stroke engine connecting rods, cam followers, and hydraulic pump assemblies — all scenarios where the long-tail search term "compact needle bearing for small bore shaft" applies directly.
| Series | HK (Drawn Cup Needle Roller Bearing) |
|---|---|
| Inner Diameter (ID) Range | 10mm – 20mm (approx. 0.39 in – 0.79 in) |
| Outer Diameter (OD) Range | See variant options |
| Bearing Height (Width) Range | See variant options |
| Available Models | HK1012, HK1014, HK1015, HK1016, HK1210, HK1212, HK1215, HK1218, HK1316, HK1412, HK1416, HK1510, HK1512, HK1516, HK1520, HK1522, HK1612, HK1616, HK1622, HK1712, HK1714, HK1718, HK1720, HK1725, HK1812, HK1816, HK1825, HK2010, HK2014, HK2016, HK2020, HK2025, HK2028 |
| Bearing Type | Full complement drawn cup needle roller bearing, open ends |
| Outer Ring Material | Case-hardened drawn steel |
| Recommended Shaft Hardness | 58–64 HRC |
| Recommended Shaft Surface Finish | Ra 0.2–0.4 µm (typically) |
| Pack Quantity Options | 1 / 2 / 4 / 8 / 10 / 20 pcs |
| Lubrication | Contact us to confirm (grease or oil per application) |
| Operating Temperature Range | Contact us to confirm |
Match the inner diameter (ID) to your shaft diameter, the outer diameter (OD) to your housing bore, and the height (width) to the available axial space. The HK designation encodes these dimensions — for example, HK1012 indicates a 10mm ID, 14mm OD, and 12mm height. Always verify all three dimensions against your engineering drawing before ordering.
No. HK drawn cup bearings are designed to run directly on the shaft surface, which acts as the inner raceway. This is what makes them so compact. However, the shaft must be hardened (typically 58–64 HRC) and ground to a fine surface finish (Ra 0.2–0.4 µm) to serve as an effective raceway and achieve rated service life.
Full complement HK needle bearings offer high radial load capacity relative to their cross-section because the maximum number of rollers fills the raceway. Exact dynamic and static load ratings vary by size — refer to standard HK-series bearing tables or contact us for specific load data for the model you need.
Full complement needle bearings (no cage) are best suited for oscillating motion or slow-to-moderate rotational speeds. At higher speeds, roller-to-roller contact generates heat and limits the speed rating. For high-speed continuous rotation, a caged needle bearing or a different bearing type may be more appropriate. Check the speed rating for your specific size before use.
Press the bearing into the housing bore using a suitable press tool that applies force evenly to the outer cup rim — never press on the needle rollers. Ensure the housing bore is clean, within tolerance, and lightly lubricated. The shaft is then inserted through the bearing. Avoid hammering directly on the bearing, as this can deform the thin-walled cup and damage the rollers.
Both grease and oil lubrication are used depending on the application. Grease is common for sealed or hard-to-access locations, while oil lubrication suits higher-speed or higher-temperature environments. Since HK bearings are open-ended, ensure adequate lubricant is supplied to the needle rollers during operation. Contact us to confirm the recommended lubricant type for your specific operating conditions.
Each size is listed as a separate variant. Select the size (ID × OD × Height) and pack quantity you need from the variant selectors above, then add to cart. If you need multiple different sizes, add each size separately to your cart. For bulk or mixed-size orders, feel free to contact us.
