Short bits are generally used for drilling shallow holes, while long bits are used for drilling deep holes. Drill bits can be either short or long, depending on their intended use. The body is the part of the drill bit that does the actual drilling. The shank is the part of the drill bit that is inserted into the drill. When measuring the length of a drill bit, measure from the tip of the bit to the point where the shank meets the body of the bit. It’s important to select the right type of drill bit tip for the job. Using a drill bit that is small can result in a hole that is too small for what you’re looking for while using a drill bit that is too large can damage the material you’re drilling into. When selecting a drill bit, it’s important to choose one that is the correct size for the job. Drill Size Chart (Number and Letter Gauge) Letter gauges are less common, but they range from A (the smallest) to Z (the largest). Number gauges are the most common type of gauge. There are two types of gauges: number and letter. The size of a drill bit is also referred to as its gauge. Drill Size Chart for Number and Letter Gauges It is important to understand the basics of drill bits, their sizes, and how they are measured to ensure efficient work when the drill is needed. Metric drill bits are measure in millimeters, while standard drill bits are measure in inches. Or click here to buy Tapcon® brand masonry screws.Drill bits come in a variety of sizes, both standard, and metric. 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. 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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