Drill bit Tvardy HSS for metal 3.10 mm black-gold finish

Tvardy HSS drill bit for metal with a 3.10 mm cutting diameter and a black-gold finish is engineered for precision drilling in steel and a variety of ferrous and non-ferrous metals. Manufactured from high-speed steel (HSS), this small-diameter bit is intended for workshop, maintenance and fabrication applications where wear resistance, dimensional stability and reliable hole quality are required. The black-gold surface treatment improves lubricity and reduces built-up material on the cutting edges, extending tool life under typical drilling conditions.

Advantages

The HSS material provides high hardness and heat resistance during intermittent and continuous drilling, while the 3.10 mm diameter ensures accurate, repeatable hole sizes for fittings, rivets and pilot operations. The black-gold finish offers improved chip evacuation and reduced friction, contributing to longer service life and fewer workpiece surface defects. The bit’s geometry balances cutting efficiency and centering stability for controlled starts and minimal walking when used with appropriate feed and speed.

Suitable for

• Drilling through mild and alloy steels
• Creating pilot holes for screws, rivets and fasteners
• Maintenance and repair work in workshops and industrial settings
• Fabrication tasks requiring small-diameter metal holes

Key specifications

• Material: High-speed steel (HSS)
• Cutting diameter: 3.10 mm
• Coating/finish: Black-gold surface treatment
• Intended use: Metal drilling (ferrous and non-ferrous)
• Suitable shank type: Straight, for standard drill chucks

How to use

Secure the workpiece and select the correct chuck to hold the straight shank securely. Use a centre punch for accurate positioning to reduce walking at start. Choose drilling speed and feed appropriate for the material: use lower speeds for harder steels and higher speeds for softer non-ferrous metals. Apply cutting fluid or lubricant when drilling steel to improve cooling and chip evacuation. Withdraw periodically to clear chips when drilling deeper holes.

Usage recommendations

For best results, match drilling speed to material hardness, keep the drill bit perpendicular to the workpiece, and use light to moderate feed pressure. Replace the bit when signs of wear or chipping appear to maintain hole quality and avoid excessive heat buildup.