$15.49
A) Drill Diameter 3mm
B) Overall length 61mm
C) Flute length 33mm
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.
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
Click here for Imperial drill bit sizes
Click here for Metric drill bit sizes
3mm Drill Bit for Metal – Compact Size, Maximum Accuracy
Tackle tight-space drilling in stainless, steel, or alloy with the 3mm drill bit for metal. Cobalt steel and 135° point ensure fast, accurate results.
Built for Precision in Tight Applications
The 3mm drill bit for metal is ideal when accuracy and control matter most. Frequently used for pilot holes, electronics casings, and small-scale fabrication, this bit works well in delicate applications where a standard bit would struggle. Its slim profile allows you to drill in tight areas without sacrificing strength or stability.
In auto repair, it's often used for marking out weld points. In engineering, it's popular for tapping preparation in M4 threads. And in DIY metalwork, it’s the go-to size for starting accurate holes before moving up to larger diameters.
Reliable Performance in Tough Metals
This bit is made from M35 cobalt steel, giving it superior heat resistance and edge retention. The 135° split point cuts through metal cleanly and helps eliminate walking, making it easier to start holes precisely—no pilot needed.
Use the 3mm cobalt drill bit to bore through:
Stainless steel (including grades 304 and 316)
Mild steel and hardened metals
Cast iron, bronze, and copper
Aluminium and alloy sheet
Rigid plastics
Even when drilling dozens of holes, the bit maintains its shape and sharpness.
Boost Performance with the Right Lubricant
To maximize efficiency and extend bit life, pair this drill with TTP CUT-IT metal cutting paste. The paste reduces friction, minimizes heat, and produces smoother cuts. You’ll also avoid common problems like binding, overheating, or bit breakage.
Accurate Speeds for a Cleaner Finish
Speed matters. Running too fast will damage the bit; going too slow wastes time. Use our Speeds & Feeds Calculator to get the right drill RPMs for your material. This small step saves wear on your bit and improves results with every hole.
Professional-Grade Performance, Guaranteed
From HVAC engineers to custom fabricators, customers across the USA rely on this 3mm drill bit for metal. It performs in the shop and in the field. If you’re not 100% satisfied, we’ll refund your purchase—no questions asked. Read our customer reviews.
With TTP HARD cobalt bits, you get results you can count on. Every time.
Additional information
| Weight | 0.07 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)