🔧 What does BSW mean? It stands for British Standard Whitworth — one of the world’s first standardised screw-thread systems, created in 1841 by Sir Joseph Whitworth. Before BSW, every manufacturer used its own thread form, making parts incompatible. Whitworth changed that, introducing a 55-degree thread angle and a coarse pitch with fewer but deeper threads. The result? Strong, durable fasteners perfect for heavy-duty work. Although most modern industries have moved to metric or unified systems

The metric system is superior to the imperial system (and this chart proves it)

Metric To Standard Wrench Conversion Chart