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When your build demands reliable radial load support in a confined space, standard ball bearings simply won't fit the bill. Engineers, machinists, and serious DIYers working on gearboxes, power tools, automotive components, and precision machinery need a bearing that packs maximum load capacity into a minimal footprint — that's exactly where HK drawn cup needle roller bearings deliver.
These HK series drawn cup needle roller bearings feature a thin-walled, drawn steel outer cup with a full complement of needle rollers retained inside. Available in a wide range of sizes from HK0306 (3 × 6.5 × 6 mm / 0.12 × 0.26 × 0.24 in) up to HK2030 (20 × 26 × 30 mm / 0.79 × 1.02 × 1.18 in), with inner bore diameters ranging from 3 mm to 20 mm and lengths from 6 mm to 30 mm. The drawn cup construction keeps the radial cross-section extremely thin — typically 1.5–3 mm wall — allowing direct housing bore installation without a separate outer ring.
Typical use cases include small engine camshaft supports where space is critical, RC vehicle and hobby gearbox pivot pins requiring low-friction rotation, and industrial pump or compressor linkage pins subject to oscillating or rotating radial loads. The full complement needle design maximises the load-carrying rollers per unit volume, making these bearings a go-to solution for high-load-density applications.
Covers HK0306 through HK2030 — inner bore 3 mm to 20 mm, outer diameter 6.5 mm to 27 mm, length 6 mm to 30 mm — one listing for your entire project.
Maximum number of needle rollers fills the drawn cup, delivering the highest possible radial load capacity for the bearing's compact cross-section.
Cold-drawn, thin-walled steel shell integrates directly into a bored housing, eliminating the need for a separate outer ring and reducing assembly weight.
Line contact between needle rollers and raceway provides low friction under radial load, supporting moderate-to-high rotational speeds in compact mechanisms.
Available in packs of 1, 2, 5, 10, 20, or 50 pieces — order exactly what your repair, prototype, or production run requires.
Suited for automotive, power tools, RC vehicles, industrial machinery, and precision instruments wherever radial space is at a premium.
| Bearing Series | HK (Drawn Cup Needle Roller) |
|---|---|
| Inner Bore Diameter Range | 3 mm – 20 mm (0.12 in – 0.79 in) |
| Outer Diameter Range | 6.5 mm – 27 mm (0.26 in – 1.06 in) |
| Length (Width) Range | 6 mm – 30 mm (0.24 in – 1.18 in) |
| Roller Type | Full complement needle rollers |
| Outer Ring Type | Drawn steel cup (thin-walled) |
| Shaft Hardness Requirement | Typically 58–65 HRC (hardened & ground journal) |
| Motion Type | Rotating, oscillating, reciprocating |
| Available Sizes | See variant options |
| Available Quantities | 1 / 2 / 5 / 10 / 20 / 50 pcs (size-dependent) |
| Material — Outer Cup | Cold-drawn steel |
| Lubrication | Contact us to confirm (grease or oil per application) |
Match the inner bore diameter (first two digits of the HK code × 1 mm, e.g. HK1012 = 10 mm bore) to your shaft diameter, and the outer diameter to your housing bore. The third pair of digits indicates the bearing length. Always verify all three dimensions — bore, OD, and length — against your engineering drawing or measured component before ordering.
HK drawn cup needle roller bearings require a hardened and ground shaft journal, typically 58–65 HRC, to serve as the inner raceway. Using a soft or unhardened shaft will cause rapid wear of both the shaft and the needle rollers, significantly reducing bearing life.
The drawn steel cup and needle rollers are manufactured from bearing-grade steel, which offers good resistance to normal operating conditions. For environments with moisture, mild chemicals, or humidity, we recommend applying a compatible bearing grease or oil to the bearing surfaces and housing bore. For highly corrosive environments, contact us to confirm suitability.
Yes. HK drawn cup needle roller bearings are well-suited for rotating, oscillating, and reciprocating radial loads. They are commonly used in linkage pins, rocker arms, and cam followers where the motion is not purely rotational. Ensure adequate lubrication is maintained for oscillating applications to prevent fretting wear.
No separate inner ring is included — the hardened shaft journal acts directly as the inner raceway. This is the defining feature of the drawn cup design: it minimises radial space by eliminating the inner ring. If your shaft cannot be hardened, a separate inner ring (sold separately) can be added to protect the shaft surface.
For a single repair or prototype, a pack of 1 or 2 pieces is typically sufficient. For small production runs or to keep spares on hand, packs of 5, 10, or 20 offer better value per piece. The 50-piece packs are ideal for batch production or workshop stock. Available pack sizes vary by bearing size — select your bearing size first to see the quantity options.
Some HK codes share the same bore and length but have different outer diameters due to different drawn cup wall thicknesses or series designations. Always verify the full three-dimension specification (bore × OD × length) shown in the variant name brackets, not just the HK code, to ensure the correct fit for your housing bore.
