6Pcs Drill Tap Bits,M3 M4 M5 M6 M8 M10 Metric Thread HSS Drill and Tap Bits 1/4" Hex Shank Thread Screw Tap Tool Set

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Smaller than M4 you readily risk breaking taps in your workpiece (taps are harder than drill bits, so this might mean you've ruined your workpiece). a b c d e "NC, NF, NEF to one inch in diameter". Sizes.com. Archived from the original on 29 September 2006 . Retrieved 1 September 2006. {{ cite web}}: External link in |work= ( help) People frequently use a chart such as this to determine the proper tap drill for a certain thread size or the proper tap for an existing hole. The “M” indicates the “metric diameter” of its thread (see tap drill chart below), which in our case is 4 mm. The second number (0.7) is the pitch which corresponds to the distance between two adjacent threads in millimeters. Finally, 20 is the length of the bolt in mm, measured from the tip of the thread to the bottom of the head (with the exception of oval headed bolts). In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly. One of the most common ways to produce such threaded holes is to drill a hole of appropriate size with a drill bit and then tap it with a tap. Each standard size of female screw thread has one or several corresponding drill bit sizes that are within the range of appropriate size—slightly larger than the minor diameter of the mating male thread, but smaller than its pitch and major diameters. Such an appropriately sized drill is called a tap drill for that size of thread, because it is a correct drill to be followed by the tap. Many thread sizes have several possible tap drills, because they yield threads of varying thread depth between 50% and 100%. Usually thread depths of 60% to 75% are desired.

The drill sizes that are near this are 15⁄ 64 in (85%), 6.0mm (85.7%), and 6.1mm (87.1%); any of these will work well. As per the ISO metric screw thread standard, the thread depth should be 0.614 x pitch, which is why a smaller pitch number also results in a lower thread depth value. Now engineers can sit down and manually calculate the right tap drill. Or they can consult a tap drill chart like those found in the next section. a b c d e "Tap Drill Sizes". widell.com. Archived from the original on 14 November 2006 . Retrieved 1 September 2006. {{ cite web}}: External link in |work= ( help)

Fit the die with the sizing information on the die facing up and the top screw fitting into the slot, making sure all the screws are loose to allow the die to sit flush.

The tap drill size for the M10 1.5 pitch is 8.5 mm. This is the size of the hole that will be created when using a tap with this drilling speed. It is important to note that this number will change depending on the specific tool being used and the type of metal being drilled. For example, stainless steel [ 1] will require a different size tap drill than carbon steel. Conclusion The drill sizes that are near this are 6.3mm (90%), 1⁄ 4 in (90.7%), 6.4mm (91.4%), and 6.5mm (92.9%); any of these will work well.

The table below shows the drill hole sizes for standard metric (coarse) threads and metric fine threads. Metric & Metric Fine Tap Drill Chart Ø