If the ends of a lock washer dig into the metal surface ... Thumb When tightening nuts and bolts without a torque wrench: For bolts or screws smaller than ¼" (6 mm), use only your little finger ...

Mild steel - used for bike frames, car body panels and fixings (nuts, bolts, screws and nails ... versatile Cast iron - used for wood and metal working vices, manhole covers, pans, gates and ...