HSS T.A.M Cobalt Drill bit Size 8.5mm

Why M35? (cobalt vs hss drill bits)

If you’re weighing cobalt vs hss drill bits, M35 is the sweet spot: it’s still HSS, but alloyed with ~5% cobalt for superior heat resistance and edge retention. Compared with standard HSS:

• Holds hardness at high temps → less tipping and glazing

• Faster, cleaner penetration on work-hardening materials (e.g., 304/316)

• Reduced walking thanks to a  split point

Also relevant terms for search: hss drill bits cobalt, hss drill bit cobalt steel.

Applications (Use Cases)

• Stainless steel (austenitic and ferritic grades), tool/alloy steels, cast iron, hard bronzes

• Ideal on drill presses and handheld corded/cordless drills (with correct RPM and feed)

• Best results with cutting fluid and step drilling (pilot → final size)

Features & Benefits

• Material: HSS M35 (5% Co) – true cobalt-alloyed HSS

• Tip:  split point for precise, no-walk starts

• Flute: Optimized helix for smooth chip evacuation

• Finish: Steam-tempered/oxide for better lubrication retention

• Shank: Straight (jobber length) for standard chucks

• Consistency: Tight tolerances for round, accurate holes

Size & Set Options

• Single sizes and curated cobalt HSS sets (e.g., 1–13 mm in 0.5 mm steps)

• For thin stock, match the clearance size closely; for thicker sections, pilot first.

Pro Tips

1. Use cutting oil, especially on stainless.

2. Run low RPM + steady feed; pause briefly to cool on long holes.

3. Chips should be continuous and silver/grey—blue/black chips mean excessive heat.

4. Re-sharpen when needed to extend tool life.

Specs (Sample)

• Product name: T.A.M HSS M35 Twist Drill

• Composition: HSS M35 (5% cobalt)

• Point geometry:  split point

• Length: Jobber

• Recommended materials: Stainless, cast iron, alloy/tool steels

• Packaging: Single bits or matched sets

FAQ

1) What is an HSS cobalt drill bit?
An HSS bit alloyed with cobalt (here, 5%) for better hot-hardness and durability in hard metals.

2) M35 vs M42?
M42 (~8% Co) offers even more heat resistance for very hard steels; M35 (5% Co) balances cost and performance perfectly for stainless and cast iron.

3) Can I use these with a cordless drill?
Yes—use low speed, apply cutting fluid, and let the bit do the work.

4) How do I prevent burning?
Lower the RPM, use lubricant, relieve chips frequently, and avoid excessive feed pressure.