Drill bit Proline 77620 — metal drill bit Ø 2 mm, length 160 mm, 1 pc

Proline 77620 is a single HSS metal drill bit with a 2 mm diameter and an overall length of 160 mm, designed for drilling metal, non-ferrous metals and plastics. The bit features a 135° point angle with chamfering adjustment for precise centering and fast penetration. Fully ground flutes ensure high accuracy and straightness of holes, making this extra-long drill suitable for tasks that require reach and precision. Supplied as one piece and compatible with standard drill chucks.

Advantages

The 135° point angle with chamfering adjustment reduces walking and improves centering on marked points, enabling quicker start-up and cleaner holes. Fully ground geometry provides consistent straightness and dimensional accuracy during drilling. The extra-long 160 mm length offers extended reach for deep or hard-to-access holes. Manufactured from high-quality refined high-speed steel (HSS), the bit delivers durability and wear resistance suitable for light fabrication and repair tasks.

Suitable for

• Drilling precision holes in thin-walled metal components
• Repair and maintenance work where extended reach is needed
• Model making and small-scale fabrication
• Drilling through steel, aluminium and various plastics

Key specifications

• Material: refined high-speed steel (HSS)
• Diameter: 2 mm
• Overall length: 160 mm
• Point angle: 135° with chamfering adjustment
• Flute type: fully ground for accuracy and straightness
• Package quantity: 1 piece per case

How to use

Select a suitable drill chuck that securely holds a 2 mm shank and set the drill speed appropriate for the material: higher speeds for non-ferrous metals and plastics, lower speeds for steel. Mark the drilling point or use a centre punch to improve accuracy. Begin drilling with steady, moderate pressure to allow the 135° point to self-center, and clear chips periodically to prevent clogging. Use cutting fluid or appropriate lubricant when drilling harder metals to extend tool life and improve surface finish.

Usage recommendations

For best results, clamp the workpiece firmly and use a drilling guide or drill bushings when repeatable precision is required. Maintain a consistent feed rate and avoid excessive side loading to preserve the straightness of the extra-long drill. Store the bit in its case to protect the ground cutting edges.