Drill bit Proline 77725, metal, Ø 12.5 mm, length 375 mm, 1 pc

Proline 77725 metal drill bit, Ø 12.5 mm and overall length 375 mm, is a single-piece HSS drill designed for medium-diameter holes in steel, non-ferrous metals and plastics. Fully ground and extra-long, it provides improved straightness and depth reach for workshop and construction applications. The 135° point angle with chamfering adjustment facilitates fast centering and reduced walking, and the bit is compatible with standard chucks for both hand-held drills and drill presses.

Advantages

The drill bit is made from refined high-speed steel (HSS) to ensure hardness and wear resistance during repeated metal drilling. Its fully ground design guarantees high accuracy and rectilinearity of holes, which is especially useful when working with drill bushes. The extra length (375 mm) extends reach for deeper holes without the need for extensions, while the 135° point angle with chamfering adjustment speeds up penetration and reduces the need for additional marking or pilot holes. Supplied as a single piece in a protective case for secure storage.

Suitable for

• Drilling medium-diameter holes in steel
• Drilling in non-ferrous metals such as aluminum and brass
• Creating holes in plastics and composite materials
• Use in hand-held electric drills and drill presses
• Workshop, maintenance and construction tasks requiring deep or hard-to-reach holes

Key specifications

• Nominal diameter: 12.5 mm
• Overall length: 375 mm
• Material: high-speed steel (HSS)
• Point angle: 135° with chamfering adjustment
• Fully ground flute design for improved straightness
• Suitable for steel, non-ferrous metals and plastics
• Pack quantity: 1 piece

How to use

Secure the Proline 77725 drill bit in a compatible chuck and tighten according to the drill manufacturer’s instructions. Select a drilling speed appropriate for the work material (lower speeds for harder steels, higher speeds for softer non-ferrous metals and plastics) and use cutting fluid when machining steel to extend tool life and improve chip evacuation. Begin drilling with steady axial pressure, allowing the bit to cut without excessive force; withdraw periodically on deep holes to clear chips and reduce heat buildup.

Usage recommendations

Use clamping or fixturing to prevent workpiece movement and employ center punching or a pilot drill when precise hole placement is required. For prolonged life and consistent results, apply an appropriate cutting lubricant when drilling steel, and inspect the drill bit for wear or damage before use.