Drill bit Proline 70835 — metal drill bit Ø8 mm, length 350 mm, 1 pc

Proline 70835 — metal drill bit Ø8 mm, length 350 mm, 1 pc is a single long drill bit intended for drilling metal and comparable hard materials. With an 8 mm cutting diameter and a total length of 350 mm, this bit is supplied as one piece and is suitable for use in hand drills and drill presses when extended reach is necessary. It is designed for tasks such as through-holes, metalworking, maintenance and repair operations where a longer-than-standard bit is required.

Advantages

The Proline 70835 drill bit combines a precise 8 mm diameter with a 350 mm length to give added reach without sacrificing rigidity. Its double-twist design supports faster chip evacuation during drilling, reducing friction and improving penetration in metal. The bit is supplied as a single unit for straightforward replacement and use in both portable and stationary drilling equipment. Optimised geometry of the cutting edges promotes consistent hole quality in demanding applications.

Suitable for

• Drilling through-holes in metal sheets and plates
• Maintenance and repair work requiring extended reach
• Use with hand-held drills and drill presses
• Metalworking tasks where a long-reach 8 mm hole is needed

Key specifications

• Cutting diameter: 8 mm
• Total length: 350 mm
• Quantity: 1 piece
• Material application: metal and similar hard materials
• Flute type: double-twist (for efficient chip removal)
• Cutting geometry: 4-blade insert with optimised geometry

How to use

Mark the drilling point and secure the workpiece to prevent movement. Select an appropriate drill speed for metal and, if required, apply cutting fluid to reduce heat and prolong tool life. Insert the Proline 70835 into the drill chuck, ensuring a secure clamping. Start drilling with steady, even pressure, allowing the double-twist flutes to evacuate chips. For through-holes, continue until the bit exits the material, then retract while the drill is running briefly to clear chips. After use, clean chips from the flutes and store the bit in a dry place.

Usage recommendations

Use moderate speeds and cutting fluid when drilling hardened metals, and avoid excessive axial force to prevent bit bending. For precise positioning and cleaner holes, consider pilot drilling if material thickness or tooling setup requires it. Ensure the drill chuck and machine are rated for the bit length to maintain stability during operation.