Tvardy drill bit HSS M2 4.0 mm black-gold extended for metal

Tvardy drill bit HSS M2 4.0 mm black-gold extended for metal is a high-speed steel cutting tool designed for drilling steel and other metallic materials. The M2 grade HSS core provides the hardness and heat resistance required for metalworking, while the black-gold surface finish increases wear resistance and reduces friction. Its extended length allows for drilling deeper holes where a standard-length bit would be insufficient, and it is suitable for use with handheld and bench drills in workshops, maintenance tasks and fabrication environments.

Advantages

The HSS M2 material combines toughness and heat resistance for consistent cutting performance in a variety of ferrous and non-ferrous metals. The black-gold surface finish improves chip evacuation, reduces galling and extends tool life under repeated use. The 4.0 mm diameter delivers precise hole size for fasteners and fittings, while the extended length supports deep-hole drilling without the need to change to specialized long-reach tooling. The bit is compatible with common drill chucks and operates effectively in both low- and moderate-speed drilling conditions.

Suitable for

• Drilling holes in steel, stainless steel and other metallic alloys
• Workshop and maintenance drilling with handheld or bench drills
• Fabrication, repair and assembly tasks requiring 4.0 mm holes
• Deep-hole drilling where additional reach is necessary

Key specifications

• Material: High-speed steel (HSS M2)
• Diameter: 4.0 mm
• Coating/finish: Black-gold surface treatment for increased wear resistance
• Length: Extended/long-reach geometry for deeper holes
• Shank type: Cylindrical shank compatible with standard drill chucks
• Application: Designed for drilling metals (ferrous and non-ferrous)

How to use

Secure the drill bit in the drill chuck, ensuring the shank is gripped tightly and runs true. Select an appropriate drilling speed for the material—typically lower speeds for harder steels and higher speeds for softer metals—and apply steady feed pressure. Use cutting fluid or suitable lubricant to reduce heat generation and prolong tool life, especially when drilling stainless steel or harder alloys. Withdraw the bit periodically to clear chips when drilling deep holes to maintain cutting efficiency and prevent clogging.

Usage recommendations

For best results when drilling steel and stainless steel, use a moderate constant feed and apply cutting oil. For deep-hole work, peck drilling (periodically retracting the bit to clear chips) is advised to avoid chip packing and overheating. Inspect the bit for wear or chipping before each use and replace when cutting performance degrades.