Drill bit Proline 77690 — metal bit Ø 9 mm, length 320 mm, 1 pc

Proline 77690 is a single high-speed steel (HSS) metal drill bit with a 9 mm diameter and an overall length of 320 mm. Engineered for drilling through metal, non-ferrous alloys and plastics, this extra-long, fully ground bit offers straightness and accuracy for through-holes, mounting tasks and workshop applications. The straight shank fits standard chucks on handheld drills and drill presses, making it suitable for fabrication, installation and maintenance work where a long reach is required.

Advantages

The drill features a 135° point angle with chamfering adjustment that facilitates faster centring and reduces wander during start-up, improving drilling speed and precision. Fully ground flutes ensure high rectilinearity and consistent hole quality, while the refined HSS material provides durability and resistance to wear in metalworking tasks. The extra length allows access to deeper or recessed holes without extensions.

Suitable for

• Drilling through steel plates and structural components
• Creating holes in non-ferrous metals such as aluminium and brass
• Drilling in plastics where straightness over depth is needed
• Workshop and on-site installation tasks requiring extended reach
• Use with drill bushes and alignment jigs for accurate positioning

Key specifications

• Diameter: 9 mm
• Overall length: 320 mm
• Material: refined high-speed steel (HSS)
• Point angle: 135° with chamfering adjustment
• Type: extra-long, fully ground twist drill
• Shank: straight shank for standard chucks
• Packaging: single piece per case

How to use

Select an appropriate drill speed and use cutting fluid when drilling into steel or other metals to reduce heat and prolong tool life. Secure the workpiece and, where possible, use a centre punch or pilot mark to prevent walking. Fit the straight shank into a properly tightened chuck on a handheld drill or drill press and apply steady, even pressure; for deeper holes allow the bit to clear chips regularly. For improved accuracy when required, use drill bushes or an alignment jig.

Usage recommendations

For best results, start at a lower RPM to establish the hole, then increase speed as the bit advances. Apply cutting fluid for metalworking, avoid excessive side loads, and clear chips frequently when drilling deep holes to maintain straightness and extend bit life.