Construction & DIY

When a screw is marked 1/4-20 or 3/8-16 and you need to know which wrench or metric drill bit to use, guessing gets expensive. This table brings together the exact equivalences between imperial and metric screw diameters, with the values in millimeters you need to order the right replacement or choose the correct tool without…

A 1/4″ screw doesn’t measure the same in Madrid as it does in Ohio, but it threads the same way in both places if you know what to look for. Inch-based and metric hardware coexist in any serious hardware store, and mixing them up leaves you with a screw that fits but doesn’t grip, or…