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
d=D: Major Diameter
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
Metric Thread Table - Coarse Pitch (M1-M68)
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.
Metric Thread Table - Fine Pitch (M1-M64)
For a complete overview on threads, view our threads terminology guide.
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