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When your assembly demands maximum load capacity in a minimal footprint, standard ball bearings simply don't fit the bill. Engineers, machinists, and serious DIYers working on motors, gearboxes, robotics, and precision machinery need a bearing that delivers high radial load ratings without adding bulk. The INA HK series drawn-cup needle roller bearings are engineered exactly for those constraints.
These bearings feature a thin-walled drawn steel outer cup and a complement of needle rollers, available in both open (HK) and single-sealed (RS) configurations. Inner diameter ranges from 3 mm (0.12 in) to 40 mm (1.57 in), with outer diameters and widths varying by size — covering over 170 size combinations in this listing. The bearing steel construction provides the hardness and fatigue resistance required for demanding rotational applications.
Typical use cases include small electric motor shafts where space is at a premium, automotive transmission components requiring high radial load density, and industrial automation joints where a drawn-cup needle bearing replaces a heavier, larger rolling element. The RS-suffix sealed variants are suited for lightly lubricated or maintenance-reduced environments such as robotics joints and conveyor pivot points.
Inner diameters from 3 mm to 40 mm (0.12"–1.57") across 170+ size combinations — one listing covers the full HK series spectrum.
Thin-walled outer cup formed from bearing steel sheet provides a compact radial envelope, maximising load capacity relative to cross-section.
Standard open HK variants for oil-lubricated housings; RS-suffix single-sealed variants for grease-packed, reduced-maintenance installations.
Through-hardened bearing steel rollers and cup deliver the fatigue life and surface hardness needed for continuous rotational duty.
Available in packs of 3 or 5 pieces depending on size — cost-effective for prototyping, repair, or small-batch production runs.
Dimensioned to INA/DIN standards — direct replacement for worn HK-series bearings in existing assemblies without housing modification.
| Bearing Series | INA HK (Drawn Cup Needle Roller) |
|---|---|
| Inner Diameter (ID) | 3 mm – 40 mm (0.12" – 1.57") |
| Outer Diameter (OD) | See variant options |
| Width / Length | See variant options |
| Material | Bearing Steel |
| Seal Type | Open (HK) / Single Sealed (RS) |
| Cage Type | Full complement needle rollers (no cage) |
| Lubrication | Oil (open) / Grease pre-packed (RS) |
| Operating Temperature | Typically –20°C to +120°C (–4°F to +248°F) |
| Pack Quantity | 3 pcs or 5 pcs (see variant options) |
| Finish | Bright / Natural steel |
| Standard | DIN 618 / ISO equivalent |
The HK designation follows the format HK[ID×10][Width×10]. For example, HK0810 means inner diameter = 8 mm, width = 10 mm. The variant name in this listing shows the full dimensions as ID×OD×Width in millimetres, so "8x12x10" means 8 mm bore, 12 mm outer diameter, 10 mm wide. Match all three dimensions to your housing and shaft.
Open HK bearings have no seals and must be lubricated externally with oil or grease during installation and periodically during service. RS-suffix variants include a single rubber contact seal on one side, retaining factory-packed grease and offering basic protection against light contamination. RS variants are suitable for applications where re-lubrication access is limited, such as robotics joints or sealed gearboxes.
Measure your shaft diameter (inner diameter), housing bore (outer diameter), and available axial space (width). Match these three values to the variant size code shown as ID×OD×Width in mm. If your shaft is imperial, convert to metric: 1 inch = 25.4 mm. When in doubt between two widths, choose the wider bearing for higher load capacity.
Drawn-cup needle roller bearings are optimised for high radial load capacity rather than maximum speed. They perform well at moderate speeds typical of gearboxes, motors, and automation joints. For very high-speed applications (e.g., spindles above 10,000 RPM), consult the specific dynamic load rating and limiting speed for your chosen size. The RS sealed variants have a lower speed limit than open variants due to seal friction.
The outer cup and needle rollers are manufactured from through-hardened bearing steel, which provides excellent fatigue resistance and surface hardness. Standard bearing steel is not stainless and will corrode if exposed to moisture without adequate lubrication or protective coating. For corrosive environments, ensure proper sealing and lubrication, or contact us to confirm availability of alternative material options.
Yes. These bearings are dimensioned to INA HK series standards (DIN 618 / ISO equivalent), making them direct dimensional replacements for worn or damaged HK bearings in existing housings. Verify the size code on your old bearing matches the variant you select. No housing modification is required when the ID, OD, and width match.
Depending on the size selected, bearings are available in packs of 3 or 5 pieces — choose your preferred pack quantity using the "Packaging (pcs)" option. Single-piece ordering is not available in this listing. If you need a custom quantity for a larger project, please contact us to discuss bulk pricing options.
