# What pitch is fine thread?

What pitch is fine thread? 1.25mm Understanding Inch & Metric Thread Callouts 25 (fine) thread has a 1.25mm pitch. To simplify metric thread callouts, the international (ISO) standard for metric threads eliminates the pitch callout

## What pitch is fine thread?

1.25mm
Understanding Inch & Metric Thread Callouts 25 (fine) thread has a 1.25mm pitch. To simplify metric thread callouts, the international (ISO) standard for metric threads eliminates the pitch callout on coarse threads.

Tap size Basic major dia (mm) Basic major dia (inch)
M16 x 1.5 16mm .6299
M18 x 2.5 18mm .7087
M18 x 1.5 18mm .7087
M20 x 2.5 20mm .7874

Is 1.25 coarse or fine thread?

M10-1.50 is a coarse thread denotation while M10-1.25 is a fine pitch. The reason is that in metric threaded fasteners the pitch is measured by the distance between the threads. So in the coarse threaded M10-1.50 fastener, there are 1.50 mm between the threads and 1.25 mm between the threads on the fine one.

### Do metric bolts come in fine thread?

The terms “coarse” and “fine” do NOT apply to METRIC hardware. Those terms apply to SAE (“standard” or “American”) hardware. The LARGER the number, the MORE coarse the thread pitch, OPPOSITE to the SAE system. For instance, the common 8mm bolt is an 8 x 1.25, which means each thread is 1.25mm wide.

How can you tell the difference between fine thread and coarse thread?

Coarse versus fine Coarse threads are those with larger pitch (fewer threads per axial distance), and fine threads are those with smaller pitch (more threads per axial distance). Coarse threads have a larger threadform relative to screw diameter, where fine threads have a smaller threadform relative to screw diameter.

What is the most common M6 thread pitch?

Metric clearance and tapping drill hole sizes.

Size Clearance Hole mm Tapping Drill (std Pitch)
M5 5.5 4.2 mm
M6 6.5 5.0 mm
M8 9 6.75 mm
M10 11 8.5 mm