HSS Cobalt Jobber Drill Bits for Stainless Steel & Alloy Drilling

Our HSS Cobalt Jobber Drill Bits are fully ground from solid M35-grade steel, containing 5% cobalt for outstanding hardness and heat resistance. Manufactured to the precise DIN 338 standard, they offer exceptional durability for demanding metalworking tasks—ideal for stainless steel, alloy steels, and other tough materials. With a sturdy 135° split point (self-centering to prevent walking) and exacting dimensional accuracy, these bits deliver fast, clean starts every time.

Top Tips

• Run at slower speeds (300–800 RPM) to manage heat and avoid work-hardening.
• Use a drop of cutting fluid or light oil to reduce friction and keep the bit cool.
• Center-punch first to prevent the bit from wandering on smooth surfaces.
• Apply steady, moderate pressure, pausing to clear chips and cool the bit periodically.
• Maintain your bits: wipe clean, oil after use, and re-sharpen on a bench grinder when needed.

Why Choose M35 Cobalt?

• Contains 5% cobalt for enhanced red hardness and long life under heat
• Surpasses regular HSS in durability and heat resistance—ideal for stainless alloy drilling
• Meets DIN 338 specifications and delivers fast, precise starts with a 135° split point

You may also be interested in:

• Ground Jobber Drill Set - Cobalt M35 - 19 Pieces - SHOP HERE: A full range of precision M35 cobalt bits for professional results on stainless steel and tough alloys.
• Cutting & Tapping Lubricant - SHOP HERE: Keep your drill bits cooler and sharper for longer with effective lubrication that reduces friction and heat.
• Extra Tough Builders Wipes - SHOP HERE: Clean your hands and tools quickly on site - ideal for removing oil, grease, and grime with ease.