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Feb 1, 2021 · This formula works for both metric and imperial units, and for all 60-degree threads (all ISO, DIN, UTS, UNC, UNS, and UNF bolts). The first tap drill chart below is in mm and the next in inches. Both are available as a printable tap drill chart PDF as well.
Find The Tap And Drill Size You Need With American Fasteners Size Chart.
ThreadsizeDrill Diameter Coarse ThreadTap Drillsize1″-14.937559/647/8-14.812513/163/4-16.687511/165/8-18.578137/64Tap Drill Calculator for Inch Sizes. Cut Threads Only. Tap drill size size formula's are theoretical based on the thread type and desired percentage of thread. Please allow for the fact that drills generally drill oversize. Enter appropriate values and press Calculate.
This tap and clearance drill chart shows tap and clearance drill sizes for standard threads. There is also a printable version that has both metric and inch threads.
Screw SizeMajor DiameterThreads Per InchTap Drill ...(75% Thread For Aluminum, Brass, & Plastics)11.0002061/6411.0001215/1611.00087/815/16.93752057/64- Thread Depth (Height) in Tapping Explained
- Calculation Examples
- Tapping Technologies
- Tap Dill Size Chart
The distance between the crest and root is called the thread height. The thread standards define the maximum thread height and are the same for metric and inch threads. In tapping, it is customary to express the thread height (Sometimes called thread depth) as the relation in percentage between the actual depth and the maximum depth. 1. A larger Th...
Calculating Tap Drill Size for M8 X 1.25 (Metric Thread) Calculating Tap Drill Size for UNC 1/4-20 (InchThread) 1. The above examples are for cutting taps.
Forming Taps
Advantages of Forming Taps (Compared with cutting taps): 1. The cycle time is shorter due to higher cutting speeds. 2. Better uniformity and accuracy of the thread. 3. A higher strength of the thread (Due to internal stress created by the forming process). 4. No chips are formed, therefore there is never a chip evacuation issue. Disadvantages of Forming Taps (Compared with cutting taps): 1. They can be used only on ductilematerials such as aluminum, brass, copper, 300 series stainless steel,...
Unified Inch Threads (UNC/UNF/UNEF) Tap Drill Size Chart
Tap Drill size per thread height (In percentage) 1. Press ⊕to view all Width (55%-85%).
Precision Sheet Metal Fabrication. Request a Quote. Tap & Drill Chart: Screw/thread size, major and minor diameter, drill size, decimal equivalent. Tapped hole, close fit, and free fit clearance holes.
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The tap size chart provides a list of 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.
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