Vrták 8,5 mm HSS, nešpecifikovaný výrobca DT5554-QZ

8.5 mm HSS twist drill bit designed for metal and general-purpose drilling. Made of high-speed steel, this 8.5 mm drill provides wear resistance and dimensional stability for creating precise holes in steel, non-ferrous metals and plastics. The bit fits standard chucks and can be used in hand drills and drill presses, offering consistent performance for maintenance, workshop and DIY tasks that require reliable 8.5 mm holes.

Advantages

The HSS material delivers high hardness and heat resistance during continuous drilling, reducing wear and maintaining cutting geometry. The twist-flute design ensures effective chip evacuation and stable drilling action while the ground point promotes accurate centering and reduced walking on the workpiece. This drill bit is compatible with common drilling tools and suitable for repeated use in a variety of materials.

Suitable for

• Drilling holes in mild and alloy steels
• Working with non-ferrous metals such as aluminium, brass and copper
• Creating openings in plastics and composite materials
• General maintenance, workshop repairs and DIY projects
• Use with hand-held drills and bench drill presses

Key specifications

• Cutting material: high-speed steel (HSS)
• Diameter: 8.5 mm
• Flute type: twist
• Point type: ground centre point for accurate starts
• Typical applications: metalworking, plastics, general-purpose drilling
• Compatibility: standard drill chucks (hand drills and drill presses)

How to use

Secure the drill bit in a suitable chuck ensuring proper concentricity and tight clamping. Select an appropriate spindle speed and feed rate according to the material being drilled: higher speeds for non-ferrous metals and plastics, lower speeds for harder steels. Use cutting fluid or lubricant when drilling steel to reduce heat and prolong tool life. Apply steady pressure without forcing the bit and withdraw periodically to clear chips when drilling deeper holes.

Recommendations

For best results, pre-mark the drilling location and consider using a centre punch on metal to prevent walking. Match drill speed and lubrication to the material: use cutting oil for steels and moderate speed for aluminium and plastics. Inspect the bit for wear or chipping before use and replace when performance degrades.