Millimetres and inches, with fractional marks to 1/64″.
Catalogue drill sizes, positioned by their cutting diameter.
Basic major diameters, with cutting-tap drill recommendations where listed. BSP G and R have no recommendation in this reference. Nearby standards are not interchangeable.
Browse tapping recommendations by hole diameter. Each belongs to an exact thread pitch and form; BSP G and R are not included.
Your base stays on the left. Add or rearrange scales at any time.