Drill bit Tvardy HSS for metal 8.50 mm, black-gold finish (MPN T02085)

Tvardy HSS drill bit for metal, 8.50 mm diameter, with a black‑gold surface finish is designed for general metalworking drilling tasks. The bit is made from high speed steel (HSS) to provide a balance of hardness and toughness for cutting through a range of ferrous and non‑ferrous metals. Its geometry suits use with standard drill chucks and bench or handheld drills for through holes, pilot holes or clearance holes in thin and medium‑thickness metal parts.

Advantages

The HSS material offers improved wear resistance and heat tolerance compared with standard carbon steel bits, maintaining cutting performance under elevated temperatures. The black‑gold surface finish reduces friction and may help chip evacuation while providing additional surface protection against corrosion and wear. The 8.50 mm diameter gives a precise, consistent hole size for fastening and assembly operations in workshops, construction or metal fabrication settings.

Suitable for

• Drilling holes in sheet metal and metal plates
• Creating clearance and pilot holes for bolts and rivets
• Working on pipes and structural metal components
• Use in handheld and bench drill machines with standard chucks

Key specifications

• Material: high speed steel (HSS)
• Diameter: 8.50 mm
• Surface finish: black‑gold coated
• Intended material: ferrous and non‑ferrous metals
• Suitable mounting: standard drill chucks (handheld and bench drills)

How to use

Secure the drill bit in a compatible standard chuck and check for correct alignment before starting. Select an appropriate drilling speed for the metal being worked—moderate to high speeds for non‑ferrous metals and lower speeds for harder steels—and apply steady feed pressure. Use cutting fluid or coolant when drilling thicker or harder metals to reduce heat build‑up and prolong bit life. Withdraw the bit periodically to clear chips and avoid excessive peening at the hole edge.

Usage recommendations

For best results, match drilling speed and feed to the material: reduce speed for stainless and hardened steels, increase speed for aluminum and softer alloys. Apply light cutting fluid on continuous or deep drilling operations and replace the bit if wear or chipping is observed to maintain hole accuracy.