Tools & Gear Drills Specialist

• No. 4 HSS Centre Drill
• Bright Finish HSS No.4 Centre Drill 118° / 60°
• Centre Drills are used with a lathe to centre drill stock for mounting in the lathe.
• They are designed to drill a small diameter pilot hole followed by a 60° countersink which provides a bearing surface for the 60° point of the lathe centre.
• Centre drills are also used extensively with milling machines to accurately start holes.
• The hole locations can be dialled in using the milling machine calibrated hand wheels.
• The hole is then started using the centre drill.
• The large diameter shank on the centre drill holds the drill point right on centre.
• Once the hole is started, the centre drill is replaced with a drill of the desired diameter and the finished hole is then drilled.