Uk Drills Cobalt Drill Bit - 3.3mm

Manufactured with 5% cobalt for maximum drilling power, this drill bit is better suited for cuttin...

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Product Information

Full details

The Uk Drills 3.3mm Cobalt Drill Bit is engineered for metalworkers and DIY enthusiasts who require precision drilling in high-density materials. Featuring a 5% cobalt alloy composition, this bit offers superior heat resistance and durability when cutting through hardened steel, stainless steel, and abrasive alloys; however, users should note that cobalt bits are more brittle than standard high-speed steel bits and require careful handling to prevent snapping.

All features

Model Part Number	3.3mm
Brand	B&Q

Extended Product Information

FAQs

Can I use this on wood or plastic?

While this bit is optimized for metal, it will work on wood and plastic, though standard high-speed steel bits are usually more cost-effective for those materials.

Do I need a special drill for this bit?

No, it fits any standard drill chuck that can accommodate a 3.3mm shank.

Why is the bit so brittle?

Cobalt bits are hardened to withstand extreme heat, which inherently makes the metal structure less flexible than softer steel bits.

Is cutting oil necessary?

Yes, using cutting oil or fluid significantly extends the life of the bit when drilling through hard metals like stainless steel.

What speed should I set my drill to?

For 3.3mm bits in steel, use a slower RPM to prevent work-hardening the metal and overheating the bit.

Troubleshooting

Bit is dulling quickly

Ensure you are using a cutting lubricant and reducing your drill speed to prevent overheating the tip.

Bit snaps during operation

Avoid applying lateral or side-to-side pressure; ensure the drill is held perfectly perpendicular to the workpiece.

Hole is not drilling clean

Check that the bit is securely fastened in the chuck and increase pressure slightly while keeping the drill speed low.

Pros and Cons

Pros

Excellent heat resistance compared to standard HSS bits
High hardness allows for drilling in stainless steel
Precise 3.3mm diameter for accurate hole sizing
Extended service life when used with appropriate lubricants

Cons

More brittle than standard drill bits; prone to snapping if bent
Not suitable for use with impact drivers that apply excessive side force
Requires lower drilling speeds to maintain longevity

Setup, Compatibility & Care

For optimal results, ensure the bit is securely clamped in your drill chuck, avoiding any wobble. This bit is fully compatible with standard power drills and drill presses that accept a 3.3mm shaft. To maintain the tool, always store it in a dry container to prevent oxidation. If the bit becomes dull, it requires specialized sharpening equipment, such as an alumina or diamond grinding wheel, as standard grinding stones are often insufficient for the high-hardness cobalt alloy.