DKFL HK 0808 Needle Roller Bearing
The DKFL HK 0808 is the perfect answer to these constraints. Instead of big, heavy balls held in a thick cage, this bearing uses rows of slender, steel rollers that resemble sewing needles. Unlike round balls that only touch the shaft at a tiny, single point, these "needles" make contact along their entire length. The result is incredible: a component that occupies virtually no space but supports heavy radial loads as effectively as a much larger bearing. The 0808 model is the "little powerhouse" of the industrial world, designed specifically for high-precision, space-tight applications.
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DKFL HK 0808 Needle Roller Bearing
The Miniature Giant: Industrial Power in a Fingertip-Sized Package
Why Can Small Components Handle Big Jobs?
Imagine you are servicing a delicate piece of equipment: a cordless power drill, a modern electric mixer, or perhaps an automotive side-mirror folding mechanism. Inside these devices, space is at a premium. There is simply no room for bulky, spherical ball bearings. If you try to use a standard bearing with an 8mm inner diameter, you would be forced to use a heavy, wide component that likely won't fit the housing. Engineers solved this spatial dilemma with the ingenious "Needle Roller Bearing."
The DKFL HK 0808 is the perfect answer to these constraints. Instead of big, heavy balls held in a thick cage, this bearing uses rows of slender, steel rollers that resemble sewing needles. Unlike round balls that only touch the shaft at a tiny, single point, these "needles" make contact along their entire length. The result is incredible: a component that occupies virtually no space but supports heavy radial loads as effectively as a much larger bearing. The 0808 model is the "little powerhouse" of the industrial world, designed specifically for high-precision, space-tight applications.
Decoding "HK 0808": What Do the Numbers Mean?
Nomenclature like "HK 0808" isn't cryptic engineering code; it’s a simple dimensional blueprint. Here is how you read it:
- "HK": This indicates the "Drawn Cup" construction. Unlike traditional bearings made from heavy solid steel blocks, these are created by precision-pressing high-strength steel sheets. This allows for a thinner wall without sacrificing any structural integrity.
- First "08": This specifies the Inner Diameter (the bore). It is designed to fit perfectly onto an 8 mm shaft.
- Second "08": This specifies the overall Width (or height) of the bearing, which is 8 mm.
Combined, you get a compact powerhouse with an 8mm inner diameter, a 12mm outer diameter, and an 8mm width. It is a masterclass in space efficiency.
DKFL HK 0808 Technical Specifications
| Component Type | Drawn Cup Needle Roller Bearing |
| Inner Diameter (Shaft) | 8 mm |
| Outer Diameter | 12 mm |
| Overall Width | 8 mm |
| Brand | DKFL (Quality Assured) |
| Inner Ring Included? | No (Requires a hardened shaft) |
Why Choose the DKFL HK 0808?
Selecting the right bearing isn't just about matching dimensions; it's about reliability. Here is why the HK 0808 is a top choice:
- Extreme Space Saving: When you only have 2mm of radial clearance, this is the only solution that works. It enables designers to create thinner, lighter, and more compact machine housings.
- Smart Load Distribution: By spreading weight across the entire needle roller, these bearings prevent stress concentrations. Your machinery runs quieter and with significantly less vibration.
- Impact Resilience: Because of the large contact surface, these bearings handle sudden start-stop operations or intermittent shock loads much better than standard ball bearings.
- Cost Efficiency: The drawn-cup manufacturing method provides premium performance at a competitive price, making it ideal for both prototyping and mass production.
Installation Rules: Avoiding Early Failure
Needle roller bearings are precise instruments. Improper handling will destroy them before the machine ever turns on. Follow these rules:
1. Use a Press, Never a Hammer: The outer cup is thin-walled. Striking it directly with a hammer will deform the casing and ruin the bearing raceway. Always use a hydraulic arbor press with a mandrel that matches the bearing face.
2. Hardened Shaft Required: Because the HK 0808 has no inner ring, it uses your shaft as the raceway. If your shaft is standard mild steel, the needles will dig into it and destroy it within hours. Ensure your shaft is hardened (58-64 HRC) and ground smooth.
3. Initial Lubrication: Never run a bearing dry. Pack it with a high-quality, lithium-complex grease before final assembly to ensure smooth startup and protect against corrosion.
Where Does the HK 0808 Shine?
You will find the DKFL HK 0808 in a variety of tight-space industrial applications:
- Power Tools: Used in the gearboxes of compact cordless drills and rotary tools.
- Automotive Sub-systems: Found in side-mirror assemblies, wiper motor linkages, and small transmission sub-assemblies.
- Household Appliances: Essential for juice extractors, mixers, and other small appliances where motor space is limited.
- Robotics & Automation: Used in miniature actuators and gripper joints requiring low-friction, high-strength support.
Frequently Asked Questions
Is the HK 0808 different from the HK 0810?
Both have the same 8mm ID and 12mm OD. The difference is the width: 0808 is 8mm wide, while 0810 is 10mm wide. If space is tight, use the 0808.
Why shouldn't I use needle bearings for side loads (axial loads)?
Needle bearings are designed for radial (up-and-down) loads. Axial forces will cause the rollers to grind against the side cage, leading to immediate failure.
Does it need to be sealed?
If your environment is dusty, use a sealed variant if possible. If using the open HK 0808, ensure the housing is sealed to prevent dirt from grinding the needles.
DKFL Quality: The Secret to Long-Lasting Compact Machinery
A single failed bearing can stop your entire machine. At KGICO, we supply genuine, high-hardness DKFL bearings to ensure your designs remain reliable, smooth, and industrial-grade, no matter how small they are.
Consult with KGICO and Buy DKFL HK 0808 Bearings