1/24/2024 0 Comments Letter drill bit sizes chart![]() 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. WHERE YOU HAVE THE ROOM always drill at least a 1/4" deeper than the thread depth you need, that's where you will most likely break the tap, at the bottom. 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. My experience/opinion: if you have the choice use the larger size drill, you will get a satisfactory thread and are much less likely to break the tap. They are usually not a standard size fraction, they may be a few thousand's of an inch +/- as stated in the other posts. ![]() Other common sizes include: 13mm drill bits. However, for comparison, the minimum sizes available in drill bit sets can range from as little as 0.3mm all the way up to 16mm, while the maximum sizes can range from 1.6mm to 80mm. ![]() That's where the letter drills come into play. TAP DRILL CHART PHONE: 1-80 FAX: 1-80 WEB: Imperial has made a concerted effort to provide accurate information in its catalog and on its website, however Imperial assumes no responsibility for the accuracy of the information. drill letter decimal (inch) decimal (mm) A.2340: 5.944: B.2380: 6.045: C.242: 6.147: D.2460: 6.248: E.2500: 6.350: F.2570: 6.528: G.2610: 6.629: H.2660: 6. Two of the most common drill bit sizes are 9.53mm and 12.7mm respectively. Style B charts provide a pipe tap drill chart as well as decimal equivalents of tap drill sizes, fractions, wire gauge drill sizes, letter drill sizes, and metric sizes. It will tap easier and you'll be less likely to break the tap, in fact if you have a home drill press the same still holds true.Now, I say that without being familiar with engine manufacturing specs, perhaps things like turbo holes, main bearing/crankshaft holes, etc. Style A charts provide decimal equivalents of fractions, wire gauge drill sizes, letter drill sizes, and metric sizes. For our purposes, auto industry, and the fact that most probably we will be hand tapping the hole it is sufficient to go with the 75% thread fit. The tap /drill size may vary from chart to chart, this is based on the percentage of thread desired, for instance an aircraft industry % maybe higher(tighter fit) than,say a boiler manufacturer. ![]() Choose from our selection of drill gauges, including drill bit size identifiers, screw size identifiers, and more. Decimal Equivalent Table for 1/64 ' to 63/64 '. Based on 30+ years as a tool and die maker/machinist = a "standard" clearance hole is + 1/16 (.060") up to 1/2" and over 1/2" it is +1/8(.125"). Tap and Drill Sizes for UNF, UNC, Metric ISO, and American Standard Pipe Thread Sizes. ![]()
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