Reference Charts

This UN-8 Thread Chart provides a quick reference for Unified National 8 Thread Series thread sizes and is designed for engineers, machinists, manufacturers, maintenance technicians and workshop professionals working with larger diameter imperial threads. Whether you're selecting the right tap,...

This UNEF Thread Chart provides a quick reference for Unified National Extra Fine thread sizes and is designed for engineers, machinists, maintenance technicians, manufacturers, apprentices and workshop professionals. Whether you're selecting taps, dies or drill bits, this chart helps you...

This BSF Thread Chart serves as a quick reference guide for British Standard Fine thread sizes, designed for engineers, machinists, maintenance technicians, apprentices, restorers and workshop professionals. Whether you're sourcing the right BSF taps, selecting appropriate drill sizes or working...

The BSW Thread Chart is an essential reference tool for engineers, machinists, maintenance technicians, apprentices and workshop professionals who work with British Standard Whitworth threads. Whether you're restoring vintage machinery, servicing classic British vehicles or maintaining older industrial equipment, this...

This Metric to Fractional Inch Conversion Chart provides a quick reference for converting millimetre (mm) measurements into common fractional inch and decimal inch sizes. This chart is useful for engineers, machinists, fabricators, apprentices and workshop professionals when selecting drill sizes,...

The UNF Thread Chart provided above is a quick reference guide for Unified National Fine thread sizes. Whether you're an engineer, machinist, maintenance technician, manufacturer, apprentice or workshop professional, this chart is designed to help you quickly identify the correct...

Diameter TPI Drill Size (mm) No. 1 64 1.55 mm No. 2 56 1.85 mm No. 3 48 2.1 mm No. 4 40 2.35 mm No. 5 40 2.65 mm No. 6 32 2.85 mm No. 8 32 3.50 mm...

This Metric Coarse Thread Chart serves as a quick reference guide for ISO Metric Coarse thread sizes, designed specifically for engineers, machinists, maintenance technicians, manufacturers, apprentices and workshop professionals. Whether you're selecting the right tap, die or drill bit, or...

Why Tap Drill Size Matters Selecting the correct tap drill size is one of the most critical decisions a machinist makes in the workshop. Get it right, and your threads will be clean, strong, and efficient. Get it wrong, and...