I have not used Tapcons much at all, have always used lead anchors. plastic anchors or sleeve anchors. For 3/16 dia Tapcons, the recommended bit dia is 5/32. First tried on concrete block and while the screw threaded in, the fit was loose. Tried again while holding the hammer drill as steady as I could to avoid enlarging the hole and still got the loose fit.
Today I was drilling into high strength concrete in a high rise apt ceiling using a Bosch Bulldog rotary hammer. I do not have a SDS 5/32 bit so I had the bit in a chuck mounted on the Bosch. The fit was really loose, so I gave up on the Tapcons and enlarged the hole to 1/4 and used a lead anchor and a wood screw.
Why can I not get a snug fit with a Tapcon?
Today I was drilling into high strength concrete in a high rise apt ceiling using a Bosch Bulldog rotary hammer. I do not have a SDS 5/32 bit so I had the bit in a chuck mounted on the Bosch. The fit was really loose, so I gave up on the Tapcons and enlarged the hole to 1/4 and used a lead anchor and a wood screw.
Why can I not get a snug fit with a Tapcon?