![]() Less than 1” embedment will decrease the holding values and may provide no holding values at all. The masonry screw must be embedded a minimum of 1” and a maximum of 1-3/4” into the masonry base material. The masonry screw must be installed a minimum distance into the masonry to obtain minimum holding values. The chart below shows the length of the drill bit to use with each length of masonry screw: The length of the bit used should allow the hole to be drilled a minimum of 1/2” deeper than the masonry screw will penetrate the base material. The 1/4” diameter requires the use of a 3/16” carbide tipped bit. The 3/16” diameter masonry screw requires the use of 5/32” carbide tipped bit for drilling the hole. The carbide tipped bit must meet ANSI standards B212.15-1994 to ensure the correct tolerance between hole size and masonry screw size requirements. The bit that is used in the hammer drill for the masonry screw has a carbide tip. Using a wire brush, vacuum or compressed air will ensure that the hole is clean before installing the masonry screw. Once the hole is drilled, it must be cleaned of all dust and debris. Using a straight rotation drill may create a hole that is not shaped properly and may negatively affect the holding strength of the screw once installed. This will ensure that the hole drilled will have accurate dimensions. ![]() The hole in the masonry should be drilled by use of a hammer drill that is set in the hammer and rotation mode. ![]()
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