$18.40
A) Drill Diameter 3.3mm
B) Overall length 65mm
C) Flute length 36mm
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.
3.3mm 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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Click here for Metric drill bit sizes
3.3mm Drill Bit for Metal – Perfect for M4 Tapping Holes
The 3.3mm drill bit for metal is ideal for M4 threads. Superior strength and a 135° cobalt tip make it your go-to for stainless steel, alloy, and more.
Designed for Tapping Prep and Fine Hole Work
Need precision for an M4 tapped hole? The 3.3mm drill bit for metal is the ideal match. It’s widely used by machinists and engineers as the perfect pre-tap diameter. But its use doesn’t stop there—it’s great for creating strong, neat holes in thin or medium-gauge metal panels.
Because it offers slightly more clearance than a 3mm bit, it’s favored for critical setups where exact sizing is essential. It’s also commonly used in electronics housings, robotics, and industrial maintenance.
Cobalt Strength, Split Point Precision
Built from M35 cobalt steel, this bit resists wear and remains sharp after repeated use. The 135° split point makes it easy to drill exactly where you need, even on hard metals. It cuts quickly and cleanly without wandering.
This bit is perfect for:
Tapping hole prep for M4 bolts
Stainless steel and heat-treated steels
Aluminium, brass, and bronze
Mild steel and construction-grade metal
Rigid plastics and laminates
Optimize Drilling with Lubrication
To get cleaner holes and longer tool life, we recommend using TTP CUT-IT during drilling. The lubricant keeps temperatures low and ensures the drill moves freely through the metal.
Find the Right Speed Every Time
Avoid ruining your bit with the wrong RPM. Our Speeds & Feeds Calculator helps you find the right speed for each job and metal type. With proper speed and feed, your bit stays sharper longer.
Trusted Quality with a Money-Back Promise
This 3.3mm drill bit for metal has earned its place in pro toolkits across America. Whether you're drilling stainless or prepping for tapping, you can trust its performance. Read the reviews.
And with our money-back guarantee, there’s zero risk.
Additional information
| Weight | 0.08 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)