M27 Metric Thread Dimensions and Pitch

Below are the key dimensions for M27 metric threads: pitch, tap drill and clearance drill according to ISO 724:2023.

M27 Coarse (standard)

M27 Pitch:  3mm
M27 Tap Drill:  24mm
M27 Clearance Drill:  30mm
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M27 Metric Thread

M27 ISO metric thread profile illustration

Welcome to our M27 Metric Thread Page, your ultimate resource for quick measurements on M27 metric threads. We've gathered a broad spectrum of data for all standard metric threads you'll employ in your components, highlighting important metrics like thread pitch, tap drill, and clearance drill. This page serves as a complete solution for professionals and hobbyists in need of reliable, accurate data.

M27 Coarse Pitch Dimensions

Nominal Size
d=D
p
r
d2=D2
d3
D1
h3
H1
Tap Drill
M27
27
3
0.433
25.051
23.319
23.752
1.84
1.624
24
All dimensions stated in are mm (millimetre)

M27 Fine Pitch Dimensions

| Nominal Size | d=D | p | r | d2=D2 | d3 | D1 | h3 | H1 | Tap Drill | |--------------|-----|-----|-------|--------|--------|--------|-------|-------|-----------| | M27x1.0 | 27 | 1 | 0.144 | 26.35 | 25.773 | 25.917 | 0.613 | 0.541 | 26 | | M27x1.5 | 27 | 1.5 | 0.217 | 26.026 | 25.16 | 25.376 | 0.92 | 0.812 | 25.5 | | M27x2.0 | 27 | 2 | 0.289 | 25.701 | 24.546 | 24.835 | 1.227 | 1.083 | 25 |

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 M27 thread?

The pitch for an M27 thread is 3 mm.

What is the tap drill for an M27 thread?

The tap drill for an M27 thread is 24 mm.

What size is a clearance hole for an M27 thread?

The clearance drill for an M27 thread is 30 mm.

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