Countersinks and Counterbores

Drill Service stocks an extensive range of countersink drills, counterbores, and back spot face cutters to suit a wide variety of applications.

Countersinks are used to create a chamfer at the entrance of a drilled hole, typically using a dedicated countersinking drill bit. While traditionally done by hand, countersinking is now commonly performed on drills and milling machines. This process is often required for the correct seating of countersunk screws or to provide a clean lead-in for secondary operations such as tapping.

Cutters are available  in Carbide, Carbide Tipped, HSCo, and HSS, with a selection of single flute, 3-flute, 6-flute, and multi-fluted options.

Available angles include 60°, 82°, 90°, and 100°. In addition to in-house bespoke modifications and specials, we supply countersinks and counterbores from top-quality international brands, including Ultra Tool and ICS (USA), and Ilix and Magafor (Europe).

Couterbore is used to bore a flat-bottomed hole, typically wider at the top—ideal when a fastener such as a socket head cap screw needs to sit flush with or below the surface of the workpiece. Our comprehensive range includes both standard counterbores with attached pilots and a diverse selection with detachable pilots, available in Carbide Tipped, HSCo, and HSS.

Back Spot Face Cutters allow you to reach the far side of a workpiece (away from the spindle side) and cut back toward the spindle. Available in Carbide Tipped and HSS, these tools come in 4 or 6 flutes, depending on the size. Pilots are made from EN16 toughened steel, available in either straight or taper shank.

Don’t forget to browse our full range of drill sets, tools, and accessories on our website. For any enquiries, feel free to contact our customer service team at 01293 774911.