BA Machine Screws (British Association Thread)

BA (British Association) machine screws are widely used in electronics, instruments, model engineering, clocks, scientific equipment and precision mechanisms. Their fine thread form and small diameters make them ideal for delicate assemblies where accuracy and reliability are essential.

Typical uses include electrical terminals, control panels, gauges, meters, optical equipment, model engineering projects and restoration of vintage instruments. BA screws remain a standard choice in many precision engineering fields due to their consistent sizing and well‑defined thread geometry.

The British Association thread system was introduced in 1903 for small screw threads used in electrical and scientific instruments. BA threads use a 47.5° thread angle and a logarithmic pitch series, giving excellent performance in miniature engineering applications. They continue to be important in electronics, instrumentation and restoration work.