$23.25
A) Drill Diameter 4.2mm
B) Overall length 75mm
C) Flute length 43mm
Point angle 135 degrees
Frequently Asked Questions
What materials can this cobalt drill bit cut?
Our cobalt drill bits handle stainless steel, cast iron, hardened steel, alloy steels, aluminum, copper, and more.
What speed should I use when drilling metal?
Use our Speeds & Feeds Calculator to set the correct RPM. Running too fast will overheat the bit; slower speeds preserve sharpness.
Can cobalt drill bits be resharpened?
Yes — cobalt drill bits can be resharpened, giving you long-term value.
How is cobalt different from standard HSS?
Cobalt (M35, 5%) withstands higher heat and stays sharper longer, making it ideal for harder metals compared to standard high-speed steel.
Do I need cutting paste when drilling metal?
We recommend TTP CUT-IT cutting paste for smoother drilling, cooler operation, and longer tool life.
What customers say
Average rating:
4.9 / 5 ·
Based on
154 reviews
- DIYMark (YouTube) — “TTP HARD outperformed leading US bits on tough metals.”
- Catus Maximus (YouTube) — “Impressed with the M35 cobalt set and CUT-IT paste.”
- Customer — “Clean holes in stainless; slower RPM + paste made the difference.”
Reviews reflect the TTP HARD cobalt drill bits range. Independently tested and certified for hardness by SGS Testing.
4.2mm cobalt M35 metal drill bits
Drill stainless steel and harder metals easily:
- Heavy Duty Cobalt Drill Bits
- Suitable for drilling harder metals including stainless steel
- Used by professionals and home improvement enthusiasts
- Can be resharpened
- Rockwell hardness C average of 66 certification
- Money Back Guarantee
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4.2mm Drill Bit for Metal – The Precision Bit for Technical Jobs
Tackle stainless steel, cast iron, and more with our 4.2mm drill bit for metal. Made from M35 cobalt with a 135° split point for pinpoint accuracy.
Ideal for Specialist Projects
The 4.2mm drill bit for metal is often used in tasks where precision and strength matter. From fabricating brackets to fitting electrical components, this bit shines when working with tight tolerances. Thanks to its M35 cobalt steel makeup, it stays sharp and resists heat, making it ideal for repetitive work on harder metals.
Cut Through Tough Metals with Ease
The bit features a 135° split point, which means it starts drilling right where you need it—no wandering or slipping. That makes it great for tasks on stainless steel and high-tensile materials. It’s also effective for:
Cast iron and tool steels
Mild and hardened steel
Non-ferrous metals like brass and bronze
Aluminum and composites
To maintain peak performance, use TTP CUT-IT metal cutting paste—essential for longer bit life and cooler drilling temperatures.
Dial In for Best Results
Maximize the life of your drill bits by using our Speeds & Feeds Calculator. It’s free and helps you determine the ideal RPM and feed rate based on material and drill size.
Trusted, Tested, and Guaranteed
We supply metalworkers across the USA with bits they trust. Our 4.2mm drill bit has received outstanding feedback for both reliability and performance. Read verified opinions in our Customer Reviews PDF.
Plus, we back all our drill bits with a full money-back guarantee. If it’s not right for your job, we’ll make it right.
Summary
The 4.2mm drill bit for metal is a high-performance solution for precise, demanding drilling. Made from M35 cobalt and sharpened to a 135° split point, it’s built to power through the toughest materials—without fail.
Additional information
| Weight | 0.27 lbs |
|---|
Prices : All Prices are United States (US) Dollar ($) Shipping : We ship from Michigan Warehouse across North America & Canada (Max cart weight 4.2lbs for Canada)