Metric Thread Chart
Detailed specifications for metric threads, both coarse and fine pitch. We have dedicated page for each thread linked in the coarse table below.
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
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Metric Thread Table - Coarse Pitch (M1-M68)
Metric thread sizes, including the core diameter (d1/D1). The table below contains links to a page showing coarse metric thread dimensions.
Advantages of Coarse Threads
✅ Are less prone to stripping and cross threading
✅ Less susceptible to being damaged and can still work with 'nicks' in the thread
✅ Faster to install than fine-pitch threads
Disadvantages of Coarse Threads
❌ Not as strong as a corresponding fine-pitch thread
❌ More prone to loosening under vibration
❌ Not suitable for threading into thin-walled parts
Metric Thread Table - Fine Pitch (M1-M64)
Metric thread sizes, including the core diameter (d1/D1). The table below shows fine thread sizes commonly available for different fine metric thread.
Advantages of Fine Threads
✅ Size for size a fine pitch thread is stronger than a coarse pitch thread in both in tension and shear.
✅ The smaller pitch allows for finer adjustment for applications that require precise adjustment.
✅ Fine threads are more easily tapped into hard materials and thin-walled pipes.
✅ Less torque is required to achieve the same level of preload compared to coarse threads.
✅ Fine threads have a smaller incline to coarse threads so they are less likely to loosen.
Disadvantages of Fine Threads
❌ Fine threads are more susceptible to being damaged from contaminates.
❌ More care has to be taken when assembling parts with fine threads, making them unsuitable for high-speed assembly.
❌ Parts require longer thread engagement.
For a complete overview on threads, view our threads terminology guide.
To find out more useful engineering information head over to our guides page to learn how to perfectly design your parts for production! Or if your parts are all ready for production get a free 24-hour quote from us now.
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