Knowing what size drill bit to use for a 1/4″ Tapcon screw is important, as using the wrong size bit can damage the screw or the material you are drilling into. While there are a few different ways to determine what size bit you need, the simplest method is to use a chart that lists the recommended drill bit size for various Tapcon screw.. 1. injury. Drill using a hammer drill, drill hole 1/4" deeper than anchor embedment. Use the charts below to select the correct drill bit. Clean Hole. Using a blow out bulb or compressed air, remove dust from hole. Drive anchor using a hammer drill with nut driver or Phillips bit until fully seated. For faster and easier installation, use a.

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In the absence of specific recommendations, a 3/16" or 5mm drill bit is commonly used for 1/4" Tapcon screws.. The 3/16" Tapcon requires the use of 5/32" diameter bit, and the 1/4" Tapcon requires a 3/16" diameter bit. Length.. The shank of the SDS bit is about the size of a small finger with two slots and two groves. The slots are designed for positive rotation and the grooves allow the bit to move in the chuck allowing for a much harder.