Drill bit GRAPHITE HSS cylindrical for metal 10.5 mm (55H035)

GRAPHITE cylindrical HSS drill bit, 10.5 mm diameter, designed specifically for drilling metal. Made from high-speed steel (HSS) to provide abrasion resistance and thermal stability during cutting operations. The bit's cylindrical shank suits most chucks on hand drills and drill presses, enabling accurate through-holes and pilot holes in steel and other ferrous materials for metalworking, maintenance and fabrication tasks.

Advantages

The HSS material delivers good wear resistance and retains hardness at elevated temperatures, which reduces premature wear when drilling into steel. A precisely ground cutting geometry ensures consistent chip evacuation and steady drilling progress. The cylindrical shank simplifies mounting in standard chucks and supports secure clamping. The 10.5 mm diameter offers a commonly used size for creating clearance or pilot holes for fasteners and for through-holes in medium-thickness metal.

Suitable for

• Drilling through mild and alloy steels
• Creating pilot holes for tapping or fastening
• Metal fabrication and repair work
• Use in workshop hand drills and drill presses

Key specifications

• Material: High-speed steel (HSS)
• Shank type: Cylindrical shank for standard chucks
• Diameter: 10.5 mm
• Intended material: Metal (ferrous materials)
• Typical applications: Through-holes, pilot holes, general-purpose metal drilling

How to use

Secure the drill bit in the chuck of a hand drill or drill press, ensuring the bit is clamped concentrically. Mark the drilling point and, when appropriate, center-punch to prevent walking. Start drilling at a moderate speed recommended for HSS in steel, applying steady feed pressure without forcing the bit. Use cutting fluid or lubricant for improved heat dissipation and chip evacuation when drilling thicker or harder metals. Withdraw periodically to clear chips and avoid overheating.

Usage recommendations

For best results when drilling steel, use cutting oil and select a drill speed appropriate to the material thickness—slower speeds for harder or thicker metals. Inspect the cutting edges before use and replace the bit when wear or chipping reduces performance. Store in a dry place to avoid corrosion.