![]() Tap Drill Recommendations Chart -Decimals, Fractional & Metric Sizes National Pipe Tapered Tap (NPT) and Drill Chartĭrills Depot - Drill Press | Drill Machine | Drill Bit Guide It simplifies the process of selecting the right tap drill size, saving time and ensuring precision in every project. This chart is a must-have resource for engineers, machinists, and anyone involved in pipe fitting or plumbing work. NPT Tap Drill Chart Explained What is an NPT Tap Drill Chart?Īn NPT Tap Drill Chart is a reference tool that provides guidance on the appropriate tap drill sizes for specific NPT thread sizes and pitches. Top 12 Best Drill Bits for Metal Drilling.Top 15 Best Drill Bits for Hardened Steel.A tap drill that is too large (or a tap that’s too small for the hole created) results in shallow internal threads and the potential for stripping. Clearance between the tap hole and the tap’s diameter reduces tap wear and the effort required. The choice of the right tap drill size is critical for several reasons. The hole created by the tap drill serves as a guide for the tap, ensuring that the threads are cut accurately and to the proper depth. A tap drill is a specific-sized drill bit used to create a hole in a workpiece before tapping threads into it. The Significance of Tap Drills What is a Tap Drill?īefore we dive deeper into the NPT Tap Drill Chart, it’s crucial to understand what a tap drill is and why it matters. Pipe threads used in hydraulic circuits can be divided into two types: Jointing threads are pipe threads for joints made pressure tight by sealing on the threads and are taper external and parallel or taper internal threads. NPT has a tapered male and female thread which seals with Teflon tape or jointing compound. Carbon Steel NPT Pipe Taps are for cleaning threads in all materials and making new threads in soft materials. Understanding NPT TapsĪlso called ‘pipe taps’, National Pipe Taper (NPT) taps are appropriate for threading a wide variety of materials both ferrous and non-ferrous. Before start lets understanding about the NPT tap drill. This size chart is a must-have for anyone involved in metal drill, machining, or fabrication. Here you will find NPT Tap Drill Size that is the perfect addition to any CNC shop & garage toolbox. This versatile & practical tool provides an invaluable resource for professionals and hobbyists alike, offering comprehensive information on tap drill sizes, decimal equivalents, and fractional metric measurements. You can measure 1/16″ to 1/2″ range of drill bits using that gauge.Enhance your drilling tapping operations with the Useful Magnets Tap Drill Chart. As for me I use this gauge to quickly identify the drill bit size in inches and millimeters. The below table will introduce you to the fractions and decimals of the inches with mm. So we have to interchange the metric units and imperial units. Inches are really popular in the USA but, beyond that, mostly used SI units. You can multiply by 25.4 of inches value when you convert that to mm.Įx – 0.5 inches = 1/2″ = 0.5 inches × 25.4 = 12.7mm When you measure drill bit size in inches, you can convert it into mm using this method. Hence measure it as much as possible accuracy. 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. ![]() When drill bit diameter size is available in mm it can convert into inches easily. ![]() Fractionĭrill Bit Sizes in inches and mm table Drill Bit Size Conversion Methods 1. ![]() You can see fractions, inches, and mm values for each drill bit size here. How to Convert Drill Bit Inches to mm?īy following the above method, this table has been prepared with available drill bit sizes.
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