Best Drill Bits for Stainless Steel
Why drilling stainless steel is so difficult
Stainless steel is one of the hardest materials to drill. Standard HSS bits often fail because:
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Heat builds quickly, causing the metal to work-harden.
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The surface is slippery, making it difficult to start a hole.
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Bits blunt or snap, wasting time and money.
If you’ve ever struggled to drill stainless, you’re not alone. The good news? With the right tools and technique, it’s straightforward.
What makes the best drill bits for stainless steel?
The best drill bits for stainless share these qualities:
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Hardness – strong enough to cut through work-hardened steel.
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Heat resistance – can withstand friction without dulling.
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Durability – won’t snap under pressure.
That’s why professionals turn to M35 cobalt drill bits. Unlike coated bits, TTP HARD cobalt bits have 5% cobalt alloyed throughout the body. This means the strength doesn’t wear off – the bit stays sharp for longer.
Why choose TTP HARD cobalt drill bits
TTP HARD cobalt drill bits are designed specifically for drilling hard metals like stainless steel.
✅ SGS-tested hardness (Rockwell 66) – independent certification.
✅ Proven performance – cuts stainless, HARDOX, sprung steel, cast iron.
✅ Full cobalt body (not coating) – stays sharper, longer.
✅ Versatile range – individual sizes, packs, and complete drill bit sets.
For best results, pair with TTP CUT-IT cutting paste ›
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Reduces heat build-up.
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Prevents work-hardening.
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Keeps drill bits sharper for longer.
What our customers say
⭐ “I’ve never managed to drill stainless without snapping bits until now. These went through like butter.” – John, UK Engineer
⭐ “Outperformed Drill America and others in my workshop tests.” – DIYMark (YouTube review, USA)
⭐ “Saved hours in the workshop – well worth the investment.” – Paul, Mechanic
Recommended cobalt drill bit sets
For stainless steel, we recommend:
🛒 Order direct from TTP HARD – trusted by mechanics, engineers, and workshops across the UK.
Video: drilling stainless steel with ease
🎥 Watch how easily TTP HARD cobalt drill bits cut through stainless steel:
FAQs – drilling stainless steel
What drill speed should I use for stainless steel?
Use a slow speed. Too fast and the metal will heat and work-harden. Use our drill speed chart › for guidance.
Do I need cutting paste when drilling stainless?
Yes – always. CUT-IT paste › keeps the bit cool, prevents work-hardening, and extends drill bit life.
Can cobalt drill bits cut other metals too?
Absolutely. They’re ideal for stainless steel but also drill cast iron, hard alloys, and HARDOX450.
Which sizes are best for stainless steel?
Choose the correct size for your job. Smaller pilot holes (2–4mm) make larger sizes easier.
Conclusion
Drilling stainless steel doesn’t have to be a nightmare. With TTP HARD cobalt drill bits, you’ll cut cleanly, avoid blunted bits, and save hours of frustration.
Pair your bits with CUT-IT cutting paste for maximum efficiency – and enjoy smoother, faster stainless drilling every time.