# What size hole do I drill for a 10-32 tap?

## What size hole do I drill for a 10-32 tap?

Tap Drill Size Chart

Bolt Size Drill Size Closest Fractional
10-32 NF #21 5/32″
5mm-0.90mm 4.2mm
5mm-0.80mm 4.3mm
12-24 NC #16 11/64″

## What is the drill size for a 10-32 screw?

The chart below shows drill sizes up to 1 inch in diameter….

Screw Size-TPI Recommended Hole Diameter Drill Bit Size
10-32 0.1770″ #16
12-24 0.1990″ #8
1/4-20 0.2280″ #1
5/16-18 0.2900″ L

How do you measure tap drill size?

As a rule of thumb, for Metric threads, the tapping drill can be calculated by subtracting the pitch from the diameter of the thread. eg for an M5x0. 75 thread the tapping drill is 5-0.75mm = 4.25mm. For Imperial (inch) threads the tapping drill size is calculated in the same way, diameter minus pitch.

### What drill bit do you use for a 1024 tap?

The correct size drill bit for 10-24 tap is a #25 drill bit, the measurement being 5/32”.

### What is a 6-32 tap?

The 6-32 thread starting tap can be used for cutting new threads or to clean up damaged threads in a previously tapped hole. This tap has several tapered threads at the end to guide the tap into the hole and begin cutting threads.

How do you calculate tap drill size?

How to Calculate Tap Drill Size. Apply the numbers to the formula using an 84 percent thread depth. The formula would be: Dh = 0.252 — 0.0130 (84/20) = 0.0130 (4.2) = 0.252 — 0.0546 = 0.1974 inches. Find the nearest drill bit size in 1/16ths of an inch. Multiply 0.1974 times 16 and the answer is 3.15.

## What size drill bit for 10 32?

a 10-32 screw isn’t 10/32″ in diameter. The 10 is the size of the screw and the 32 is the number of threads per inch. The correct drill bit is a number 21 or 5/32″.

## What is the diameter of a 10 32 screw?

The number “10” is simply a size designator with no numerical meaning. The number “32” refers to 32 threads per inch. You can identify a 10-32 screw by measuring the diameter with a ruler at exactly 3/16″ (0.190″).

What size drill bit for tap?

A good tap drill is 90% (± 2 pp) of major diameter for fine threads. Therefore, a size ​7⁄16 screw (​7⁄16 ≈ 0.437) with 14 threads per inch (coarse) needs a tap drill with a diameter of about 0.371 inches.