The size of the still bit should be slightly smaller than the diameter of the nail. It is recommended that you should spend ample time to read and understand the drill bit guide. To achieve this, the right bit size should be used. This size drill bit should be used for drilling the initial hole that will then be tapped. The pilot hole should be well fitted to the screw or the nail so that it would not wobble when inserted. Lastly, the recommended tap drill size is provided for each standard tap size. The drill size chart contains tools up to 1.5 inches in diameter, but larger tools are also commonly used.įor each thread count, the equivalent thread pitch is provided and for metric taps, the approximate thread count is shown based on the pitch. Tap Drill Chart: Tapped Hole Aluminum, Brass, Plastic Microform Precision. The metric system uses the thread pitch, which is the distance between threads, measured in millimeters. In the fractional and screw size systems, the thread count is used, measured in threads per inch, such as UNF threads and UNC threads. The thread spacing can be coarse or fine, will be listed after the diameter. A screw size number corresponds to a diameter which is larger for a higher screw size. Fractional sizes are listed in inches, metric sizes are listed in millimeters following the letter "M". The tap size chart is a table that lists standard size taps, specifying the diameter and thread spacing, for fractional, metric, and screw sizes. The decimal equivalents of the diameters are shown in both English and Metric units. The wire gauge and letter systems refer to tool diameters that increase as the wire gauge decreases from #107 to #1 and then continues from A to Z. A 5/16-18 tap works great for metal and plastic materials, and its steel composition makes it efficient, durable, and able to withstand high speeds. For a 0.2570 hole diameter, use an F-size drill bit. Fractional sizes are measured in inches, while metric sizes are measured in millimeters. It is generally recommended you use drill bit size F for a 5/16 tap however, this can vary based on the hole diameter you want to achieve. The drill size chart is a table list standard size drill bits in several measurement systems, including fractional, metric, wire gauge number, and letter. Selecting the correct drill size Number 2 (2.2mm), 1.6mm - 1.9mm Number 4 (2.8mm), 2.2mm - 2.6mm Number 6 (3.6mm), 2.6mm - 3.2mm Number 8 (4.2mm), 3.1mm. People would need a drill size chart and tap size chart to determine the proper tap drill for a certain thread size or proper tap for an existing hole. One of the most common ways to produce the thread holes is to drill a hole of the right size with a drill bit and tap it with a tap. When manufacturing custom CNC machining parts, holes with screw threads are often required for fastening the finished part or facilitating the building. What is the Drill and Tap Size Chart and Why to Use Them? When it comes to the selection of drill bit sizes and tap sizes, there are standard drill and tap size chart for reference. On small screens, scroll sideways for the following tables.ĭecimal Equivalents of Drill Sizes up to 1-1/4" (31.Drilling is a process of producing a hole while tapping is a technique used to cut a thread inside a hole, so the drill bit and tapping tool are often used in sequential to fabricate CNC parts with thread holes. For a clearance close fit hole, the drill size indicates a "27".ĭecimal Equivalents of all Drill Sizes Table For tapping Aluminum, the drill size indicates a "36" drill. If you do not need to Tap, but just drill a Clearance hole, then choose between "Close Fit" or "Free Fit". Screw Size: Threads Per Inch: Recommended Hole Diameter for Material with Flexural Modulus of Up to 200,000 P.S.I. Now, to tap a thread, choose either "Aluminum, Brass & Plastics" for softer materials or "Stainless Steel, Steels & Iron" for harder materials depending on the material you have. The "Minor Diameter" is the diameter of a 6-32 from screw thread trough to screw thread trough. Stay in this sub-row and continue on rightward. The 3rd column "Number of Threads per Inch" indicates a choice of either 32 or 40. The next column shows ".1380" which is the maximum diameter of a # 6 screw. Continue across in the same horizontal row. Looking at the first table "US English Table", look down the left most column under "Machine Screw Size" until you come to "6". If you need a clearance hole, then read across further to find the drill size for either a close fitting hole or a loose fitting hole. Read across in the same row to find the drill size for the material you will be drilling in. Look down the left most column to find the screw size that you will be tapping a hole for or drilling a clearance hole for. The Metric size group simply uses the diameter of the drill bit as a designation. Wire Gage or Number sizes (such as 27, 44, 10, etc.).Drill bits come in three US/English size groups and one Metric size group.
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