![]() ![]() Now that you've read on how to install masonry screws, perhaps you'd like to purchase them? Click here for masonry screws from CONFAST®. The flat countersunk requires a #2 Phillips driver for the 3/16” diameter and a #3 Phillips driver for the 1/4” diameter. The hex headed masonry screw requires a 1/4” driver for the 3/16” diameter screw and a 5/16” driver for the 1/4”. The flat countersunk is measured as an overall length which includes the head and is used where the head is countersunk in the material being fastened. The hex head masonry screws lengths are measured from underneath the head and are used in applications where the head of the screw is above the surface of the material being fastened. Two head styles are available: the hex and flat countersunk. The length of masonry screw must be equal to the thickness of the material being fastened plus a minimum of 1” with a maximum embedment of 1-3/4”. This lead thread can wear down, making it difficult or impossible for the screw to reach minimum embedment depths or depths leading up to the maximum embedment depth of 1-3/4”. The lead thread of the masonry screw cuts threads into the masonry. Attempting to embed a masonry screw deeper than 1-3/4” may cause installation problems, such as having the screw shear off or become stuck in the hole.Īll base materials are different, and the masonry screws installed in concrete may act differently than those installed in brick or cinder block. 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. If you have our bits, DEWALT has your back.The hole in the masonry should be drilled by use of a hammer drill that is set in the hammer and rotation mode. So tough that DEWALT offers a NO BREAK GUARANTEE (see below). Strengthened through IRON BLAST TECHNOLOGY(TM) a process that helps resist fatigue and results in extreme durability, these bits are GUARANTEED TOUGH®. The full range of bits are made in Germany with global materials and are ideal for anchor installation. In addition, with its proprietary circulating cutting carbide design, select sizes offer longer life than previous DEWALT design**. ![]() With up to twice the life of BOSCH®* you can drill through hard concrete and withstand rebar strikes with the DEWALT ELITE SERIES(TM) SDS PLUS Drill Bit 3/16” x 8”. ACCURATE HOLES: Features full carbide pilot tip for quick starts and accurate hole positioning Once the wear mark is no longer visible it is time to change the bit for proper anchor installation.
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