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# What is the tap drill size for?

## What is the tap drill size for?

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.

### What size drill bit do you use for a quarter 20 tap?

The best overall size drill bit for 1/4″ 20 UNC tap thread is a #7 drill bit, the measurement being 13/64” (0.203″diameter).

What size drill bit is needed for a quarter inch tap?

The best size drill bit for the ¼” NPT Tap is 17/16″ drill bit.

How do you read a drill chart?

Outside – measured toward either end zone, away from the 50 yard line. In front of – measured toward the director’s (home) viewpoint. Behind – measured away from the director’s (home) viewpoint. Sidelines – The sidelines are the front and back boundaries of the football field.

## How do you calculate tap drill size?

Only enter numbers in the fields.

• Do not enter any units of measurement.
• You can enter fractions. (i.e. 1/4)
• If you don’t know the %,just enter 70 Example: 1/2 – 20 Thread
• 1/2 = Major diameter