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You will want to choose a countersink that is larger than the bolt size of the hole. Countersink diameter = 1.5 x Bolt Size Hole Diameter. Example: 1/4″-20 Bolt – Multiple the diameter (. 250) x 1.5 = 0.375.
> A simple rule of thumb is to choose a countersink which is 50% larger than the diameter of the hole. > Countersink diameter = 1.5 x Bolt Size (hole) diameter. >
Countersink bits are classified into two types: one-piece countersink bits and combination countersink bits. Fluted and cross-hole drills are two types of one-piece countersinks.
A flat screw head with a tapered underside is the best choice for countersinking screws. Make sure your screw head size matches the size of the countersink bit you plan to use.