In the absence of specific recommendations, a 3/16" or 5mm drill bit is commonly used for 1/4" Tapcon screws.. The bit size should match the screw size. For a 1/4 inch Tapcon screw, you'll need a 3/16 inch bit. It's a delicate balance, but getting it right can dramatically improve the performance of your Tapcon screws.
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Best 1/4 inch tapcon drill bit size 4U Life
Best 1/4 inch tapcon drill bit size 4U Life
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Best 1/4 inch tapcon drill bit size 4U Life
Best 1/4 inch tapcon drill bit size 4U Life
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3/8″. 1/4″. The right size drill bit is necessary to ensure the Tapcon screws have a secure hold. If a smaller drill bit is used, the screw will not be able to properly penetrate the concrete in order to achieve a secure hold. If a larger drill bit is used, the Tapcon may not be able to achieve its full holding power.. A ¼" Tapcon needs to have a drill bit size of 3/16" diameter. The length varies depending on the length of the hole. The bit length should be enough so that the hole is ½" deeper than the Tapcon screw. This allows for the screw to penetrate the base material and allows the Tapcon screw to be within the minimum embedment depth of 1".
