Countersink Holes Chart for Drilling Wood Screws | Drill Bit Size Guide
Jan 14,  · The Pro Tapered comes in a set of three complete countersink combinations, sized for #6, #8 and #10 screws. The bits Countersink Bit For 8 Wood Screws are nicely tapered to match the profile of traditional woodworking Countersink Drill Bit For Wood Screws screws, and each drill bit has a flattened shank for secure locking with the setscrew. For a given screw size, the counterbore usually has more holding strength than the countersink. This is because the force applied by the ⌴-shaped bolt or socket cap screw head is parallel to the axis of the screw hole. On the other hand, the force delivered by the countersunk screw is dispersed at an angle.

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