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When shaft space is tight but load demands are unforgiving, engineers and DIY builders alike need a bearing that punches above its weight. HK drawn cup needle roller bearings are the go-to solution for mechanics, machine builders, and hobbyists working on motors, gearboxes, automotive components, and precision equipment where a standard ball bearing simply won't fit.
Each bearing in this series features a thin-walled drawn steel cup shell housing a full complement of needle rollers, delivering an exceptional load-to-size ratio. Inner diameters span 4 mm to 60 mm (approx. 0.16" to 2.36") and outer diameters range from 8 mm to 68 mm (approx. 0.31" to 2.68"), with widths typically between 8 mm and 38 mm (0.31" to 1.50"). The series covers 83 size variants following the HK designation standard (e.g., HK0408, HK1212, HK3020, HK6032).
Typical use cases include replacement bearings for small electric motors and power tools, needle bearing upgrades in automotive rocker arms and transmission shafts, and precision fits in textile machinery, printing equipment, and robotics joints — all scenarios where the long-tail search for "drawn cup needle roller bearing metric sizes" or "HK series bearing replacement" leads directly to this range.
83 Size Variants in One Listing
From HK0408 (4×8×8 mm) to HK6032 (60×68×32 mm), this series covers the full metric HK range so you can source the exact size without hunting across multiple suppliers.
Drawn Cup Shell Construction
The thin-walled stamped steel outer cup minimises radial envelope, allowing installation in housings where solid-outer-ring bearings cannot fit — ideal for compact gearboxes and linkage pivots.
Full Complement Needle Roller Design
Maximises the number of rolling elements in contact with the raceway, delivering a radial load capacity significantly greater than a ball bearing of equivalent bore diameter.
Hardened Steel Raceways
Both the cup and the mating shaft surface are designed to operate against hardened steel (typically 58–64 HRC on shaft), ensuring long service life under continuous or oscillating motion.
Open-End Design for Lubrication Access
The standard open configuration allows grease or oil to be introduced directly to the needle rollers during assembly or maintenance, extending relubrication intervals in demanding cycles.
Sold Individually — Mix and Match Sizes
Each unit is priced and shipped individually, so you can order exactly the quantity and size combination your project requires without committing to bulk packs.
| Bearing Type | Drawn Cup Needle Roller Bearing (HK Series) |
|---|---|
| Inner Diameter (ID) | 4 mm – 60 mm (0.16" – 2.36") |
| Outer Diameter (OD) | 8 mm – 68 mm (0.31" – 2.68") |
| Width | 8 mm – 38 mm (0.31" – 1.50") |
| Shell Material | Drawn steel (stamped cup) |
| Rolling Element | Full complement needle rollers |
| Cage | Cageless (full complement) |
| Sealing | Open (no seals or shields) |
| Lubrication | Grease or oil (user-applied) |
| Shaft Hardness Requirement | Typically 58–64 HRC |
| Designation Standard | HK series (metric, ISO/DIN) |
| Number of Size Variants | 83 |
| Sold As | Individual piece (qty 1) |
| Exact Size per Variant | See variant options |
Match the bearing's inner diameter (ID) to your shaft diameter and the outer diameter (OD) to your housing bore. The third dimension — width — determines axial space consumption. For example, HK1212 means ID 12 mm, OD 16 mm (or 17/18 mm depending on sub-variant), width 12 mm. Always verify all three dimensions against your engineering drawing or the worn bearing you are replacing.
HK drawn cup needle roller bearings offer a high radial load capacity relative to their bore size due to the full complement roller design. Exact dynamic and static load ratings vary by size — consult the bearing manufacturer's datasheet for the specific HK designation you select. As a general guide, larger bore sizes carry proportionally higher loads.
Standard HK series bearings are manufactured from hardened carbon or bearing steel and are not inherently corrosion resistant. For wet or chemically exposed environments, apply a compatible grease with corrosion inhibitors, or consider stainless-steel alternatives. Regular relubrication significantly extends service life in humid conditions.
Because HK drawn cup bearings are cageless and the needle rollers run directly against the shaft, the mating shaft surface must be hardened — typically to 58–64 HRC — and ground to an appropriate surface finish (Ra ≤ 0.4 µm recommended). Using a soft shaft will cause premature wear of both the shaft and the rollers.
Yes, provided the replacement bearing matches the original's ID, OD, and width exactly. HK series designations are standardised across manufacturers (ISO/DIN), so an HK1212 from any compliant supplier should be dimensionally interchangeable. Always double-check the three key dimensions rather than relying solely on the part number prefix.
Apply a thin, even coat of bearing grease to the needle rollers and the shaft before assembly. Press or tap the bearing cup squarely into the housing bore using a suitable driver that contacts only the outer cup — never strike the rollers directly. Ensure the shaft is clean, deburred, and hardened to the required specification before insertion.
Some HK designations in this listing appear with the same bore code but different outer diameters or widths (e.g., HK1212 at 12×16×12 mm vs. 12×17×12 mm vs. 12×18×12 mm). These reflect different manufacturer series or tolerance classes. Select the variant whose full three-dimension specification matches your housing and shaft exactly.
