Drill bit Tvardy HSS M35 cobalt for metal, 9.5 mm

The Tvardy HSS M35 cobalt drill bit, 9.5 mm, is a solid high-speed steel cutting tool alloyed with 5% cobalt to improve heat resistance and wear life when drilling metals. It is manufactured for general metalworking applications where higher cutting temperatures and tougher materials are expected. The 9.5 mm diameter and standard straight-shank design make it compatible with most hand-held drills and drill presses used in workshops and industrial environments.

Advantages

The M35 cobalt composition increases hardness at elevated temperatures, extending tool life during prolonged cutting of ferrous metals. The HSS substrate provides toughness to resist chipping, while the cobalt alloy improves performance when drilling stainless steels and other hardened materials. Its 9.5 mm size offers a balance between rigidity and material removal rate, and the straight shank ensures secure clamping in standard chucks.

Suitable for

• Drilling stainless steel and other high-alloy steels
• Working with cast iron and general ferrous materials
• Use in hand-held electric drills and drill presses
• Workshop repairs and industrial maintenance tasks

Key specifications

• Material: High-speed steel with M35 cobalt alloy
• Diameter: 9.5 mm
• Tip type: Standard twisted/spiral point for metal cutting
• Shank: Straight shank for standard chucks
• Suitable materials: Stainless steel, cast iron, and other ferrous metals

How to use

Select appropriate cutting speed and feed for the 9.5 mm HSS M35 drill bit according to the base material; lower speeds are recommended for stainless and hardened steels. Secure the workpiece firmly and ensure the drill is held perpendicular to the surface. Use cutting fluid or coolant when drilling stainless steel or other heat-sensitive metals to reduce temperature, improve chip evacuation and extend tool life. Maintain moderate, steady pressure—avoid forcing the bit to reduce risk of breakage or accelerated wear.

Usage recommendations

Apply appropriate cutting fluid for stainless steel and hardened materials, re-sharpen or replace the bit when wear reduces cutting performance, and verify chuck compatibility with the 9.5 mm straight shank before starting work.