Description
Drill Bit for Metalworking
- Tech Tip 1: You shouldn’t drill deeper than 1/2 of the drill bit’s fluting length to have the best drilling performance.
- Tech Tip 2: Don’t use M35 cabalt bits on hardened steel, high carbon steel and heat treated steel.
M35 Grade 5% Cobalt Steel Twist Drill Bits Set
A nice-to-have metric bit set for repeated drilling in metals
M35 Grade Cobalt Steel
- Cobalt drill bits don’t seem to be made of pure cobalt, but rather a steel alloy with certain percent cobalt. The 5-percent alloy is known as M35 grade. The cobalt increases the strength of the steel and makes it more heat-resistant.
Lowest Cost Per Hole Drilled
- Cobalt bits are more expensive than ordinary HSS drill bits. But if you often drill metals, they are a good investment since they generally tend to last longer. With an extended life, you’ll be able to lower the cost per hole drilled.
- 13PC Metric Sizes: 1.5mm, 2mm, 2.5mm, 3mm, 3.2mm, 3.5mm, 4mm, 4.5mm, 4.8mm, 5mm, 5.5mm, 6mm, 6.5mm.
Do It Slow
- Drilling metal requires low RPM. Please use a device of which the drilling speed can be adjusted.
- Be careful when you use an electric drill. The RPM could be set too high.
- The thicker the bit, the slower speed should be.
Stay Cool
- Friction between bit and metal will accumulate an amount of heat.
- It’s necessary to use cooling liquid throughout drilling to keep the bit cool. Otherwise, the bit may fry(melt) or only last a short time.
- It’s both ok to use lubricant oil and to pour water.
Right Drilling Device
- It’s highly recommended that you use a drill press to drill thick metals. It’s stable, powerful and (RPM) adjustable.
- If a drill press isn’t available, electric drill or charging drill will do the job, too. On the other hand, it’s more likely you can meet problems unless you’re really experienced.
