M4 Metric Thread
M4 Metric Thread Dimensions and Pitch
Below are the key dimensions for M4 metric threads: pitch, tap drill and clearance drill according to ISO 724:2023.
M4 Coarse (standard)
Explore our M4 Metric Thread Page, your go-to hub for quick assessments of M4 metric threads. We've curated a broad spectrum of data for all standard metric threads you'll require for your parts, highlighting important measurements like thread pitch, tap drill, and clearance drill. It's an all-inclusive resource for engineers, machinists, and hobbyists in search of reliable, precise information.
M4 Coarse Pitch Dimensions
Nominal Size
d=D
p
r
d2=D2
d3
D1
h3
H1
Tap Drill
M4
4
0.7
0.101
3.545
3.141
3.242
0.429
0.379
3.3
All dimensions stated in are mm (millimetre)
M4 Fine Pitch Dimensions
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 M4 thread?
The pitch for an M4 thread is 0.7 mm.
What is the tap drill for an M4 thread?
The tap drill for an M4 thread is 3.3 mm.
What size is a clearance hole for an M4 thread?
The clearance drill for an M4 thread is 4.5 mm.
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