BB Counterbore Twist Step Drill Dual Cutting Bit HSS for Metal 90 180 Degree M3 M4 M5 M6 M8 M10 M12 Cone Drilling Tool 1PCS

BB® Counterbore Step Drill HSS

BB HSS (high-speed steel) counterbore step drills are ideal for counterboring bolt type heads or bolts in wood, plastic, and soft metals.
These step drills allow you to drill and counterbore in one operation and are less likely to clog that 2-piece counterbores especially in aluminum.

Design

Standard spiral, helical flutes.
Cuts both body and counterbore diameters in a single pass.

The counterbore angle on bits is 90 degrees or 180 degrees.

Application

Designed for drilling mounting holes for socket-head cap screws.
The dual cutting diameters produce holes sized for each size screw. Permit the holes to be drilled for both through holes and tapped holes. The through hole style produces holes with a body diameter slightly larger than the major diameter of the screw. The tapped hole type drills holes with the diameter needed for tapping the holes. Both types produce a counterbored area correctly sized for the screw head.

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