# Inch/metric tap drill sizes and decimal equivalents

INCH/METRIC TAP DRILL SIZES & DECIMAL EQUIVALENTS

 FRACTION OR DRILL SIZE FRACTION OR DRILL SIZE DECIMAL EQUIVALENT FRACTION OR DRILL SIZE TAP SIZE NUMBER SIZE DRILLS 80 NUMBER SIZE DRILLS 80 0.0135 9/64 ————- 7/16 – 14 79 79 0.0145 27 1/64 —————— 1/64 —————— 0.0156 26 78 78 0.0160 25

Aug 14 2022

## What is the decimal equivalent of a drill?

Decimal and Metric Equivalents with Drill Sizes Drill Size Inch mm 22 0.1570 3.9878 21 0.1590 4.0386 20 0.1610 4.0894 19 0.1660 4.2164 62 more rows …

## What is the size of a tap drill?

Tap Drill Chart (mm and inches) TAP SIZE CUTTING TAPS TRU-FLO ™ FORMING TAPS TRU-FLO ™ FORMING TAPS TRU-FLO ™ FORMING TAPS INCH METRIC DRILL SIZE DECIMAL EQUIVALENT DRILL SIZE 0-80 3/64 .0469 54 M1.6 X 0.35 1.25mm .0492 1.45mm M1.8 X 0.35 1.45mm .0571 1.65mm 56 more rows …

## How important is the tap drill chart?

Therefore the tap drill chart is extremely important. To create a thread properly, one would need a set of three taps that correspond to the same bit size; namely the bottoming, the intermediate, and the taper tap.

## What does the “m” mean on a drill?

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.

## What is the correct tap drill?

A rule of thumb is that the right tap drill is around 85% for coarse threads and 90% for fine threads which feature a higher number of threads per axial distance . In our case, the correct tap drill would be the closest to 3.4 mm from below, and that is the 3.3 mm or 0.13-inch tap drill. Lower percentages such as “75% of …

## What is a tap drill?

Jump to Tab Drill Chart. Taps are cutting tools used by machinists to cut or form screw threads. The first recorded use of taps in metalworking is placed sometime in the 18th century, while the British engineer and industrialist Joseph Clement popularised the tool in the mid-19th century. We then saw standards emerge in threading with …

## What is the tap used to make a thread?

To create a thread properly, one would need a set of three taps that correspond to the same bit size; namely the bottoming, the intermediate, and the taper tap . The intermediate, or plug tap, is used first to start cutting out material from a non-threaded hole.

## When was the tap chart invented?

Tap Drill Chart – The Ultimate inch and metric table (mm and inches) Although popularised in the 19th century, the first recorded use of metalworking taps goes back to the 18th century. British engineer and industrialist Joseph Clement popularised the tool in the mid-19th century. Creating a thread requires a set of three taps corresponding to …

## Who invented the tool?

British engineer and industrialist Joseph Clement popularised the tool in the mid-19th century

## Can a bottoming tap start threading?

However, the bottoming tap cannot start the threading on an uncut hole, so it can only take part in the cutting process as the second or third tap. The taper tap is only used in certain situations such as when the material is very hard or the hole is too small.