![]() ![]() This size drill bit should be used for drilling the initial hole that will then. It is false economy to buy cheap tools that will more often than not cost you far more than buying the proper tool. Lastly, the recommended tap drill size is provided for each standard tap size. ![]() The drill size chart below contains all commonly used centre drill bit sizes. The Harbor Fright, hardware store grade Irwins, and Sears Craftsman taps are just garbage. They are commonly used to drill lathe centres and spotting drills, i.e.marking holes to guide twist drilling. Took an extra couple of hours to get that hole sorted out. The tap extractor wouldn't work (almost sheared the pins). A helpful resource for choosing the appropriate drill bit size for various applications is the drill size table for number and letter gauges. TAPPING DRILL SIZES IMPERIAL THREADS Tap Size B.S Whit U.N.F U.N.C B.S.F B.S.P B.A Drill Size Drill Size Drill Size Drill Size Drill Size Tap Size Drill Size 1/16 1.1mm 0 5.1mm 3/32 1.8mm 1/8 2.5mm 11/32 1 4.5mm 5/32 2.9mm 1/8 3/16 3.7mm 5/32 2 5/32 7/32 4.2mm 4.4mm. About 100+ hours into that project and I have a broken tap in the hole. Got to work and the piece was still setup for the next hole, drilled it, swapped the drill for my tapping guide in the drill press chuck, proceeded to tap the hole, get about 6-7 threads in, everything felt OK, and "SNICK", the damn thing broke off in the hole. The tap looked OK but not like a greenfield. Even came with a 13/64 drill bit in the package. Imperial Tap Chart: Keyway Dimensions: Melting Points: Metric Tap Chart: O-Ring Sizes: Pipe Threads: Screw Extractors: Sheet Metal Gauges & Weights: Socket Head Cap Screws: Taper Calculations. It was even the right type of spiral point tap. I needed a new 1/4-20 tap for a project I was finishing and picked up a brand new Irwin brand (supposedly made in the US of A) from my local hardware store. There is nothing more frustrating than using a crappy tool. ![]()
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