Tap Drills Popular Q&A

Q: How to Calculate a Tap Drill.
A: 1. Estimate the required thickness of the hole that needs to be threaded. This can be done by measuring the diameter of the bolt/implement thread that will inse... Read More »

Q: How to Calculate Tap Drill Size.
A: 1. Measure the overall diameter of the tap with the micrometer. In this particular instance, we want a drill bit for a ¼ - 20 tap. The ¼ is the diameter and the... Read More »

Q: What is the formula for tap drill size.
A: Tap drill size formula's are theoretical based on the thread type & desired percentage of thread. Diameter of thread minus the pitch equals the tap drill size. ... Read More »

Q: What diameter is a 12 24 tap drill?
A: Common references list the tap drill for a #12-24 screw as #17 or .173" Read More »

Q: When should tap drill holes be reamed?
A: If you are tapping drill holes, a few test holes to determine the actual depth Read More »

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The above is "Tap Drills: Vermont American 21660 Size 4 X 40 NC Tap No 43 Drill Bit Combo" recommended related products, Please click on the picture to see product details and tap drills reviews!