Metric Thread Pitch Chart

​The Metric Thread Pitch Chart (download below) provides essential information for selecting the correct thread type for bolts, screws, and other fasteners. This chart categorizes metric threads into three types based on their pitch, which refers to the distance between adjacent threads measured in millimeters.

​Thread Types:
Standard (Coarse) Threads
They provide good strength, easy assembly, and better resistance to wear and damage.
Ideal for general applications, trucking, including structural and mechanical assemblies, where quick and strong fastening is needed.

Fine Threads
Fine threads have a smaller pitch than coarse threads, meaning more threads per unit length.
They provide better clamping force and are more resistant to loosening due to vibrations.
Commonly used in automotive, aerospace, and precision machinery applications where higher strength and fine adjustments are required. 

Extra Fine Thread
These have an even smaller pitch than fine threads, making them ideal for applications requiring extremely tight tolerances and high precision.
​They offer maximum resistance to loosening in high-vibration environments and are often found in specialized engineering applications.

Why Pitch Matters
Thread pitch plays a crucial role in determining the performance of a fastener. A larger pitch (coarser thread) allows for quicker assembly and disassembly, while a smaller pitch (finer thread) provides better load distribution and prevents loosening under stress. Choosing the correct pitch is essential to ensure proper thread engagement, durability, and reliability in different applications.