Drill Bit GRAPHITE HSS cylindrical 8 mm (model 55H029)

GRAPHITE cylindrical HSS drill bit, 8 mm diameter (model 55H029), is a high-speed steel tool designed for drilling metals and other hard materials. The solid cylindrical shank fits standard chucks on hand drills and drill presses. Constructed from HSS, the bit retains hardness at higher temperatures and offers wear resistance under typical metalworking conditions. Its geometry is intended to provide reliable chip evacuation and consistent hole quality when used with appropriate speeds and cutting fluids.

Advantages

The HSS material ensures good heat resistance and edge retention during continuous drilling operations in steel and non-ferrous metals. The cylindrical shank design provides secure clamping and compatibility with a wide range of drilling machines. The 8 mm diameter delivers a balance between rigidity and cutting capacity for medium-sized holes, while the ground flutes promote stable cutting and predictable hole dimensions.

Suitable for

• Drilling through mild and alloy steels
• Working with non-ferrous metals such as aluminum and brass
• General metal fabrication, maintenance and repair tasks
• Use in hand drills and bench or pillar drill presses

Key specifications

• Material: High-speed steel (HSS)
• Shank type: Cylindrical
• Diameter: 8 mm
• Intended materials: Metals and other hard materials
• Typical use: Drilling with cutting fluid or coolant recommended for metalworking

How to use

Secure the drill bit in the chuck of a hand drill or drill press, ensuring concentric clamping and correct tightening. Select appropriate spindle speed according to the workpiece material—lower speeds for harder steels and higher speeds for softer, non-ferrous metals. When drilling metal, apply steady feed pressure and use cutting fluid or coolant to reduce heat and improve tool life. After drilling, retract the bit periodically to clear chips and avoid clogging the flutes.

Usage recommendations

For best results, pre-center the hole with a center punch when drilling sheet or thin materials, use appropriate cutting speeds and lubrication, and inspect the bit for wear before use to maintain hole accuracy and prolong service life.