4.75 mm

5.75 mm

6.75 mm

7.75 mm

To transmit power

To make adjustment

General fastening

For clamping

Acme thread

Square thread

Buttress thread

V-thread

4.5 mm

9.5 mm

9 mm

8.5 mm

Lead is twice the pitch

Lead is half the pitch

Lead is equal to pitch

Lead is 1/4 pitch