Twist drill bit set Rittal 4050.807 – 8.5 mm diameter, 10 pieces

Rittal 4050.807 is a 10-piece set of 8.5 mm diameter twist (spiral) drill bits designed for general workshop and metalworking tasks. These drill bits are made for use with standard hand drills and drill presses to create precise round holes in a variety of materials. Supplied as a compact set, the pack offers multiples for repetitive operations and replacements during ongoing projects.

Advantages

The spiral geometry and sharp point of the drill bits help ensure accurate centring and consistent chip evacuation, which supports efficient drilling in both ferrous and non-ferrous metals as well as plastics. The uniform 8.5 mm diameter across all ten pieces simplifies tool selection for jobs that repeatedly require the same hole size. Supplied as a set, the drill bits reduce downtime caused by wear and provide ready replacements for longer tasks.

Suitable for

• Drilling holes in steel and stainless steel
• Working with aluminium and copper
• Drilling through plastics and composite panels
• General workshop and maintenance drilling with hand drills or drill presses

When it may not be suitable

This 8.5 mm twist drill set is intended for general-purpose drilling and may not be the best choice for highly specialised tasks such as high-speed production drilling with coated carbide tooling, masonry or concrete drilling, or precise countersinking operations requiring combined drill–countersink tools. For very hard alloys or abrasive materials, consider tooling specified for those materials.

Key specifications

• Tool type: Twist (spiral) drill bit
• Diameter: 8.5 mm
• Quantity in set: 10 pieces
• Typical materials: Steel, stainless steel, aluminium, copper, plastics
• Colour/finish: Silver

How to use

Secure the selected 8.5 mm drill bit in the drill chuck and tighten firmly. Mark and centre-punch the drilling position where precise location is required. Start drilling at low speed to establish the hole, then increase speed as appropriate for the material while applying steady, moderate feed pressure. Use cutting fluid or suitable lubricant when drilling ferrous metals to extend tool life and improve surface finish. Clear chips regularly and allow the bit to cool between repeated holes to avoid overheating.

What to consider before purchase

• Confirm that an 8.5 mm hole size is suitable for your application and fasteners.
• Check compatibility of the drill shank with your drill chuck.
• Consider material-specific tooling if you will primarily drill very hard alloys, masonry, or ceramics.
• If you need coated or carbide-tipped bits for high-speed or high-volume production, evaluate specialised options.

Usage recommendations

For reliable results, use the Rittal 8.5 mm twist bits at speeds and feed rates appropriate to the workpiece material, apply cutting fluid for ferrous metals, and replace bits from the set when signs of wear—such as increased cutting force or poor finish—appear.