M20 Metric Thread Dimensions and Pitch

Below are the key dimensions for M20 metric threads: pitch, tap drill and clearance drill according to ISO 724:2023.

M20 Coarse (standard)

M20 Pitch:  2.5mm
M20 Tap Drill:  17.5mm
M20 Clearance Drill:  22mm
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M20 Metric Thread

M20 ISO metric thread profile illustration

Explore our M20 Metric Thread Page, your indispensable tool for quick measurements on M20 metric threads. We've curated a wide-ranging library of data for all the standard metric threads you'll implement in your components, focusing on key measurements like thread pitch, tap drill, and clearance drill. It's an all-encompassing resource for professionals and hobbyists in need of accurate and reliable information.

M20 Coarse Pitch Dimensions

Nominal Size
d=D
p
r
d2=D2
d3
D1
h3
H1
Tap Drill
M20
20
2.5
0.361
18.376
16.933
17.294
1.534
1.353
17.5
All dimensions stated in are mm (millimetre)

M20 Fine Pitch Dimensions

| Nominal Size | d=D | p | r | d2=D2 | d3 | D1 | h3 | H1 | Tap Drill | |--------------|-----|-----|-------|--------|--------|--------|-------|-------|-----------| | M20x1.0 | 20 | 1 | 0.144 | 19.35 | 18.773 | 18.917 | 0.613 | 0.541 | 19 | | M20x1.5 | 20 | 1.5 | 0.217 | 19.026 | 18.16 | 18.376 | 0.92 | 0.812 | 18.5 | | M20x2.0 | 20 | 2 | 0.289 | 18.701 | 17.546 | 17.835 | 1.227 | 1.083 | 18 |

All dimensions stated in are mm (millimetre)

ISO Metric Thread profile

d=D: Major Diameter
p: Pitch
r: Root Radius
d2=D2: Pitch Diameter
d3: Minor Diameter Male Thread
D1: Minor Diameter Female Thread
h3: Thread Height Male
H1: Thread Height Female

Major Diameter

The Major Diameter is the largest diameter on the thread and is measured from the thread crest to crest (peak of the thread).

Pitch

This is the distance (mm) from one thread to the next, this can be measured from tip to tip or groove to groove. Pitch can also be defined as TPI, which stands for threads per inch.

Minor Diameter

Minor Diameter is the smallest diameter on the thread and is measured from the thread root to root (Bottom of the thread).

Thread Angle

The angle between the thread faces. 60 degrees in the example above.

Right-Hand Thread

The thread will assemble when rotated clockwise. "righty tighty lefty loosely"

Left-Hand Thread

The thread will assemble when rotated counter-clockwise.

Frequently Asked Questions

What is the pitch of an M20 thread?

The pitch for an M20 thread is 2.5 mm.

What is the tap drill for an M20 thread?

The tap drill for an M20 thread is 17.5 mm.

What size is a clearance hole for an M20 thread?

The clearance drill for an M20 thread is 22 mm.

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