![]() ![]() It is false economy to buy cheap tools that will more often than not cost you far more than buying the proper tool. The Harbor Fright, hardware store grade Irwins, and Sears Craftsman taps are just garbage. Took an extra couple of hours to get that hole sorted out. While most manufacturers list the bit as a 21. In the case of a 21 drill bit, which is the size you would almost certainly need for a 10-32 tap, the drill bit has a diameter of 0.159 inches or 4.0386 millimeters. With such information, you can easily determine the correct drill bit size. Usually, the tap drill charts help manufacturers come up with a tightly matching pair of male and female threads. The tap extractor wouldn't work (almost sheared the pins). In most cases, drill bits are identified by their fractional size, numbered sizes, or measurements according to the metric system. A drill tap size chart is a diagram from which the right sizes of the drill bit are obtained when creating an opening. About 100+ hours into that project and I have a broken tap in the hole. The tap size chart is providing the list of standard size taps, with the diameter and thread spacing. 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. Finding the correct drill size for a Spiralock tap may be a Cut and Try process: Not all drills are. It was even the right type of spiral point tap. These charts are supplied as a recommendation only. 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. Practically, you may not be able to measure the drill bit diameter more than 2 decimal places. ![]() You can check fraction and decimal conversion using the below table. Fractional sizes are listed in inches, while metric sizes are listed in millimeters following the letter 'M'. When you need to convert mm to inches, you have to multiply the mm value by 0.0393701. The decimal equivalents of the diameters are shown in both English and Metric units. There is nothing more frustrating than using a crappy tool. The tap size chart provides a list of standard size taps, specifying the diameter and thread spacing, for fractional, metric, and screw sizes. ![]()
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