Drill bit Abraboro HSS cylindrical 4 mm, 10 pcs (AB44004000)

Cylindrical HSS drill bits Abraboro, 4 mm diameter, set of 10 pieces. These high-speed steel (HSS) bits are intended for drilling through metal and other hard materials where HSS performance is appropriate. Each bit has a straight cylindrical shank for reliable gripping in standard chucks and consistent concentricity during rotation. The set provides multiple identical 4 mm drills for repetitive workshop, maintenance or light industrial tasks that require accurate small-diameter holes in metal.

Advantages

The Abraboro HSS 4 mm drill bits combine wear-resistant high-speed steel with a precise cylindrical shank to ensure stable clamping and reduced runout. Supplied as a set of 10, they reduce downtime for replacing worn tools and allow batch drilling without frequent tool changes. The uniform diameter and geometry support consistent hole size and edge quality in steel and similar hard materials when used at appropriate speeds and with coolant or cutting fluid.

Suitable for

• Drilling through mild and alloy steels
• Workshop and maintenance repair tasks
• Preparing bolt or dowel holes in metal components
• Small production runs and batch drilling operations

Key specifications

• Drill tip material: high-speed steel (HSS)
• Diameter: 4 mm
• Shank type: straight cylindrical shank for standard chucks
• Pack quantity: 10 pieces
• Intended materials: metal and other hard materials suitable for HSS

How to use

Select an appropriate drill speed and use cutting fluid or coolant when drilling metal to extend tool life and improve surface finish. Clamp the workpiece securely and align the drill perpendicular to the surface for accurate holes. Install the cylindrical shank in a compatible chuck, ensuring firm tightening to minimize runout. Apply steady feed pressure; withdraw periodically on deeper holes to clear chips and prevent clogging. Replace worn bits from the set as needed to maintain hole quality.

Usage recommendations

For best results on steel, use moderate cutting speeds typical for HSS drills, apply cutting oil, and maintain stable workholding. When drilling hardened alloys or stainless steel, reduce speed and increase lubricant to prevent premature wear.