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When a worn or seized needle roller bearing causes play in your motorcycle swing arm, steering linkage, or industrial pivot, finding the exact replacement size quickly is critical. Engineers, mechanics, and DIY builders who work with tight radial spaces need a drawn cup needle roller bearing that fits precisely, handles high radial loads, and resists wear over long service intervals — without adding bulk to the assembly.
These HK series drawn cup needle roller bearings feature a thin-walled steel outer cup with a full complement or caged needle roller set inside. The series spans inner bore diameters from 4 mm to 20 mm (approx. 0.16″–0.79″), outer diameters from 8 mm to 26 mm (approx. 0.31″–1.02″), and widths from 8 mm to 25 mm (approx. 0.31″–0.98″). The drawn cup shell is manufactured from case-hardened steel, and the needle rollers are precision-ground for consistent load distribution.
Typical applications include motorcycle swing arm pivot bearings (e.g., HK1412, HK1512, HK1612 are common fitments), two-stroke engine small-end connecting rod bearings, agricultural machinery linkage pins, hydraulic pump cam followers, and general-purpose industrial shaft supports where a full ball bearing would be too large in diameter. The compact cross-section makes these bearings ideal for needle roller bearing replacement in tight housings where radial space is limited.
From HK0408 (4×8×8 mm) to HK2025 (20×26×25 mm), covering the most common drawn cup needle roller bearing sizes used in motorcycles, engines, and industrial machinery.
The thin-walled outer cup is cold-drawn from case-hardened steel strip, providing a consistent bore fit and high radial load capacity relative to the bearing's small envelope.
Needle rollers are precision-ground to tight diameter tolerances, ensuring even load distribution across the raceway and reducing stress concentrations that cause early fatigue.
Depending on the size variant, rollers are retained by a steel or polymer cage (or run full-complement), optimizing the balance between load capacity and speed rating for each application.
The inner raceway surface is case-hardened to resist wear and pitting under oscillating or rotating loads, extending service life in swing arm pivots and connecting rod applications.
Available in 1 pc, 5 pcs, or 10 pcs per order — order a single bearing for a one-off repair or stock up in bulk for workshop or fleet maintenance.
| Bearing Series | HK (Drawn Cup Needle Roller Bearing) |
|---|---|
| Inner Bore Diameter Range | 4 mm – 20 mm (0.16″ – 0.79″) |
| Outer Diameter Range | 8 mm – 26 mm (0.31″ – 1.02″) |
| Width Range | 8 mm – 25 mm (0.31″ – 0.98″) |
| Number of Size Options | 51 variants (HK0408 to HK2025) |
| Outer Cup Material | Case-hardened drawn steel |
| Roller Material | Bearing steel (precision-ground) |
| Cage Type | See variant options |
| Radial Load Capacity | See variant options |
| Operating Temperature Range | Typically −20°C to +120°C (−4°F to +248°F) |
| Lubrication | Grease or oil (user-applied; supplied dry) |
| Corrosion Resistance | Standard steel; apply grease or anti-corrosion coating for wet environments |
| Pack Quantities Available | 1 pc / 5 pcs / 10 pcs |
| Dimension Format | ID × OD × Width (mm) |
Remove the existing bearing and measure three dimensions with a vernier caliper: inner bore diameter (ID), outer diameter (OD), and width (W). Match these to the HK designation — for example, HK1412 means ID 14 mm × OD 20 mm × Width 12 mm. Cross-reference with your motorcycle's service manual or OEM parts list to confirm the correct fitment before ordering.
Standard HK bearings use a cage to space the needle rollers, which allows higher rotational speeds and better lubrication distribution. Full-complement versions pack in more rollers without a cage, increasing radial load capacity but reducing the maximum speed rating. For swing arm pivots (oscillating, low-speed), either type is suitable; for high-speed rotating applications such as connecting rods, caged variants are generally preferred.
Yes. Smaller HK sizes such as HK0408, HK0509, HK0608, and HK0810 are commonly used as small-end connecting rod bearings in two-stroke engines. Ensure the shaft (gudgeon pin) diameter matches the bearing's inner bore exactly, and that the connecting rod housing bore matches the outer diameter. Always apply fresh engine oil or assembly grease before installation.
HK needle roller bearings typically offer significantly higher radial load capacity than a deep groove ball bearing of the same bore diameter, because the line contact of needle rollers distributes load over a larger area. However, they are not designed to carry axial (thrust) loads. For applications with combined radial and axial loads, pair the needle roller bearing with a separate thrust washer or thrust bearing.
These bearings are supplied dry (without pre-applied grease). Before installation, apply a thin, even coat of a lithium-based or molybdenum-disulfide grease suitable for the operating temperature range (typically up to 120°C / 248°F). For connecting rod applications, engine oil applied at assembly is standard practice. Re-lubricate at the intervals specified in your equipment's service schedule.
Use a bearing press or a correctly sized socket that contacts only the outer cup rim — never strike the needle rollers or cage directly. Press the bearing squarely into the housing bore until it is flush or to the specified depth. Ensure the housing bore and shaft are clean, free of burrs, and within the recommended tolerance (typically H7 for the housing bore, h6 for the shaft). Avoid hammering directly on the bearing face.
Standard HK bearings are made from carbon or bearing steel without a corrosion-resistant coating. In wet or outdoor environments — such as motorcycle swing arms exposed to rain — apply a water-resistant grease (e.g., lithium complex or marine-grade grease) and ensure the bearing is protected by seals or dust covers in the housing. Inspect and re-grease at regular service intervals to prevent rust-induced pitting.
HK bearings require a precise shaft-to-bore fit — the shaft diameter must match the bearing's inner bore exactly (typically within ±0.01 mm). If your shaft diameter falls between two standard sizes, do not use an undersized bearing. Instead, verify the shaft diameter with a micrometer; if the shaft is worn, it may need to be replaced or built up before fitting a standard bearing. Contact us to confirm if you are unsure.
