What Kind Of Drill Bit Is Used For Heavy Metal?

What kind of drill bit is used for heavy metal?

Drilling heavy metal can be a frustrating task if you use the wrong bit. I remember once trying with basic bits and ending up with broken tools and wasted material. Want to know which bits handle heavy metal best?

The best drill bits for heavy metal are cobalt alloy bits with a 135-degree split point. They offer durability, heat resistance, and precise cutting needed for tough industrial metals.

Let me explain why cobalt bits outperform others and how choosing the right point angle can help you drill heavy metals efficiently.

How to drill through extremely hard metal?

Tackling extremely hard metals can feel like an impossible job. I faced this on a recent project and had to rethink my whole approach. Want to avoid my trial-and-error process?

To drill extremely hard metal, use sharp cobalt or carbide bits, drill at slow speeds with cutting fluid, and employ gradual pressure to avoid overheating and bit damage.

Extremely hard metals, such as tool steel or hardened alloys, require more than just tough bits. The drilling process itself must protect both the bit and the workpiece. I recommend starting with a pilot hole to reduce resistance and progressively enlarge it.

Using cutting fluid is critical to reduce heat and friction, preventing work hardening of the metal. Drilling too fast or pushing too hard causes bit wear and can crack or chip carbide tips. Slow, steady speeds paired with peck drilling-briefly pulling the bit out to clear chips-help maintain clean cuts and prolong bit life.

Also, preheating isn't usually necessary, but if you attempt high-volume or repetitive drilling, occasional breaks to cool the area can save you from bit failure. Remember, patience leads to clean holes and extended tool durability.

What is the best drill bit angle for hardened steel?

Choosing the right drill point angle makes all the difference when working with hardened steel. I used to switch between bits, unsure which angle worked best-until I learned the facts. What angle should you pick?

A 135-degree split point angle is ideal for hardened steel because it reduces walking on the surface and cuts efficiently without excessive pressure or heat buildup.

The standard 118-degree point angle is common for softer metals like aluminum or mild steel. It penetrates more easily but causes the bit to "walk" or skid on hard, smooth surfaces like hardened steel. This makes precise drilling tricky.

The 135-degree split point has a flatter tip and built-in cutting lips that allow the bit to bite immediately, preventing walking and improving surface grip. This reduces the force needed to start the hole, lowers heat generation, and improves hole accuracy.

In industrial settings, using 135-degree bits on hardened steel not only speeds up work but also extends bit life. The split point design reduces the risk of damage from overheating or excessive pressure, which are common causes of premature bit failure.

What is the difference between 118 degree and 135 degree drill bits?

I used to wonder why bits of different angles performed so differently-even when they looked almost the same. Understanding their differences saved me lots of frustration. What really sets 118-degree bits apart from 135-degree ones?

118-degree drill bits have a sharper point suitable for softer materials and less surface grip, while 135-degree bits feature a flatter, split point that offers better centering and cutting for hard metals.

Here is a simple breakdown:

My experience working with manufacturers showed me that 135-degree bits greatly reduce the chance of slipping on tough surfaces. This makes them the default choice for industrial and heavy-duty work. Meanwhile, 118-degree bits remain excellent for everyday drilling on less demanding materials.

Conclusion

For heavy and hardened metals, choose cobalt or carbide bits with a 135-degree split point, drill slowly with cutting fluid, and use steady pressure to ensure clean, efficient holes without damaging your tools.