Drill bit Proline 5.2 mm, model 79052K, length 86 mm, 1 pc

Proline 5.2 mm drill bit, model 79052K, is a single high-speed steel (HSS) straight shank bit with an overall length of 86 mm, designed for making precise 5.2 mm holes in metal and other hard materials. The bit features ground cutting edges and a 135° point angle with chamfering adjustment to reduce walking on the workpiece and speed up centring. Packaged as a single unit in a blister pack, this Proline drill bit is suitable for use with handheld drills and drill presses in repair, fabrication and workshop environments.

Advantages

The refined HSS material provides durability and heat resistance for repeated metal drilling. Ground edges ensure clean, accurate cuts and improved chip evacuation. The 135° point angle with chamfering adjustment reduces the need for extensive centre punching and helps maintain hole position, while the straight shank enables secure clamping in standard drill chucks. Supplied in a blister pack that protects the cutting surface during storage and transport.

Suitable for

• Drilling through steel and non-ferrous metals
• General workshop and fabrication tasks
• Repair and maintenance work with handheld drills or drill presses
• Creating 5.2 mm clearance or pilot holes for fasteners

Key specifications

• Cutting diameter: 5.2 mm
• Overall length: 86 mm
• Point angle: 135° with chamfering adjustment
• Material: refined high-speed steel (HSS)
• Shank type: straight shank for standard drill chucks
• Edge finish: ground cutting edges
• Packaging: single piece in blister pack

How to use

Clamp the drill bit securely in the chuck so the shank is seated straight and tight. Select an appropriate drill speed for the workpiece material—moderate speeds for mild steel and lower speeds for hardened metals—and apply steady feed pressure. Use cutting fluid or coolant when drilling metal to reduce heat, prolong tool life and improve chip evacuation. If precise hole location is required, make a light centre punch or use the chamfering adjustment to help start the cut before full drilling.

Usage recommendations

For best results, use coolant during continuous drilling in metal and replace the bit when wear or chipping of the cutting edges is evident. Match drill speed and feed to material hardness and ensure the workpiece is securely clamped to prevent movement and improve hole accuracy.