![]() ![]() To avoid mistakes that are very apt to occur from the number of gauges in use, and from the absurd practice of applying the same gauge number to different thicknesses of different metals in different towns, it is best to ignore them all, and, in giving orders, to define the diamter of wre and the thickness of sheet metal by parts of an inch. In manufactured parts, holes with female screw threads are often needed they accept male screws to facilitate the building and fastening of a finished assembly. On this subject, Trautwine says: "No trade stupidity is more senseless than the adherence to the various Birmingham, Lancashire, etc., gauges instead of at once denoting the thickness and diameter of sheets, wire, etc., by the parts of an inch, as has long been suggested. Below is a comprehensive drill and tap size chart for all drills and taps, imperial and metric, up to 36.5 millimetres (1.44 in) in diameter. The relation between these arbitrary designations and actual sizes is about as remote as is the stupidity of a modernistic composer from sanity. Defined in the ANSI B94.11M-1979 Standards, the fractional inch drill bit sizes start from 1/64 inch and scale up all the way to 1inch with 1/64inch increments. ![]() He has this to say on the subject:Īrbitrary Gauge Sizes: The practice of designating sizes of wire, sheet metal drills, etc., by arbitrary numbers and letters has been the cause of much confusion among manufacturers and customers. Typical fractional drill bit sizes in a masonry drilling project are 1/8, 3/8, and 5/16 inches. Occasionally, specialty fasteners will require bits that are not available in standard sizes. ![]() This chart includes the standard sizes of drill bits in a variety of diameters. Last night I decided it was about time I got around to reading my 1942 edition of "Audels Machinists and Tool Makers Handy Book" by Frank D. Letter gauge drill bits are used when a precise hole size is needed for threading applications. A typical fractional drill bit size chart is provided below for reference. ![]()
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