Metric screw thread

Metric threads include Coarse and Fine, measured in millimeters (mm), is the most common and universal thread. The thread has an acute angle and the angle is 60°.

Thread representation

M [Name diameter] × [Tooth distance]

Example of coarse teeth

M 5 (× 0.8 can be omitted)

Example of fine teeth

M 5 × 0.5

ISO 724 metric thread series

• Coarse
• Fine