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When a standard ball bearing simply won't fit and your shaft needs reliable radial load support in a confined bore, drawn cup needle roller bearings are the go-to solution for mechanical engineers, motorcycle technicians, and industrial maintenance professionals. The HK series covers an exceptionally wide size range — from the miniature HK0408 (4×8×8 mm) up to the heavy-duty HK4020 (40×47×20 mm) — so you can source the exact bearing your application demands without compromise.
Each bearing in this listing is a drawn cup needle roller bearing: a thin-walled, stamped steel outer cup housing a full complement of needle rollers retained without a cage. The cup wall is typically 0.3–0.5 mm thick, keeping the overall radial cross-section minimal. Inner diameters span 4 mm (≈0.157 in) to 40 mm (≈1.575 in); outer diameters range from 8 mm (≈0.315 in) to 47 mm (≈1.850 in); and widths run from 8 mm (≈0.315 in) to 32 mm (≈1.260 in) depending on the selected model.
Drawn cup needle roller bearings in the HK series are widely used as clutch needle bearings in motorcycle swing arms and transmission countershafts, as miniature bearings in power-tool gearboxes and hand-drill chucks, and as oscillating-motion bearings in automotive rocker arms and connecting-rod small ends — wherever a full-complement needle roller bearing with a thin stamped cup delivers the highest radial load density per unit volume.
74 models from HK0408 (4×8×8 mm) to HK4020 (40×47×20 mm), covering miniature to medium-duty applications in a single product family.
Cageless design maximises the number of rolling elements in contact, delivering higher radial load capacity relative to the bearing's compact envelope.
The drawn outer cup integrates directly into a machined housing bore, eliminating the need for a separate outer ring and reducing assembly weight and cost.
Geometry and surface finish are suited to both continuous rotation and oscillating/indexing motion, making these bearings effective in clutch mechanisms and rocker arms.
Commonly specified for motorcycle swing-arm pivots, transmission layshafts, and small-engine connecting rods where space and weight are critical constraints.
Dimensional compliance with ISO 3245 and DIN 618 standards means these bearings serve as direct replacements for OEM drawn cup needle roller bearings across major equipment brands.
| Bearing Type | Drawn Cup Needle Roller Bearing (Full Complement) |
|---|---|
| Series Designation | HK (ISO 3245 / DIN 618) |
| Size Range (ID × OD × Width) | 4×8×8 mm to 40×47×20 mm (see variant options) |
| Inner Diameter (ID) | See variant options |
| Outer Diameter (OD) | See variant options |
| Width | See variant options |
| Outer Cup Material | Stamped / drawn steel |
| Rolling Element | Needle rollers (full complement, cageless) |
| Cage | None (full complement) |
| Lubrication | Grease or oil (application dependent) |
| Operating Temperature | Typically −30 °C to +120 °C (−22 °F to +248 °F) |
| Motion Type | Rotation and oscillating motion |
| Quantity per Order | 1 piece (single bearing) |
Match the bearing's inner diameter (ID) to your shaft diameter and the outer diameter (OD) to your housing bore. The width should accommodate your available axial space. Each variant in this listing is labelled with its ID × OD × Width in millimetres — for example, HK0810 = 8 mm ID × 12 mm OD × 10 mm wide. Measure your shaft and housing with a calliper before ordering.
A drawn cup needle roller bearing uses a thin-walled stamped steel outer cup as the outer raceway, which presses directly into a housing bore. A standard needle roller bearing typically has a machined outer ring. The drawn cup design saves radial space and weight, making it ideal for compact assemblies such as motorcycle gearboxes and power-tool chucks.
Yes. HK series drawn cup needle roller bearings are rated for both continuous rotation and oscillating (rocking or indexing) motion. They are commonly used in clutch mechanisms, rocker arms, and connecting-rod small ends where the motion is not a full 360° rotation.
The standard HK series uses carbon or case-hardened steel, which offers moderate corrosion resistance. For outdoor, marine, or high-humidity environments, apply a compatible bearing grease with corrosion-inhibiting additives and consider re-greasing intervals appropriate to your conditions. If stainless steel is required, please contact us to confirm availability.
HK drawn cup needle roller bearings are designed to run directly on a hardened and ground shaft (typically 58–65 HRC surface hardness, Ra ≤ 0.4 µm). If your shaft is not hardened, a separate inner ring (HK inner ring or a matched shaft sleeve) should be used to prevent premature wear of the shaft surface.
Both grease and oil lubrication are suitable. For most applications, a lithium-based NLGI 2 grease applied at assembly is sufficient. Re-lubrication intervals depend on operating speed, temperature, and load — consult your equipment's service manual or a bearing lubrication guide for specific intervals. Avoid over-greasing, which can cause heat build-up.
Yes, provided the ID, OD, and width match your OEM specification. HK series bearings conform to ISO 3245 and DIN 618 dimensional standards, which are widely adopted by motorcycle and power-tool manufacturers. Cross-reference your OEM part number against the HK designation to confirm compatibility before installation.
