double-threaded screw
51Drumhead — For other uses, see Drumhead (disambiguation). Drumhead mounted on a drum A drumhead is a membrane stretched over one or both of the open ends of a drum. The drumhead is struck with sticks, mallets, or hands so that it vibrates and the sound… …
52HMS Royal Oak (08) — His Majesty s Ship Royal Oak (pennant number 08) was a Revenge class battleship of the British Royal Navy, torpedoed at anchor by the German submarine U 47 on 14 October 1939. Launched in 1914 and completed in 1916, Royal Oak first saw action at… …
53Inconel — is a registered trademark of Special Metals Corporation that refers to a family of austenitic nickel based superalloys. Inconel alloys are typically used in high temperature applications. It is often referred to in English as Inco (or… …
54Bibcock — A bibcock, also called a sillcock, is commonly used to provide hose connections outside of buildings, for use in gardening, watering lawns, washing cars, Cleaning carpet, and so on. Certain bibcocks are colloquially known as frost frees because… …
55Oxy-fuel welding and cutting — Oxyacetylene redirects here. For the song, see Cubanate. Side of metal, cut by oxygen propane cutting torch …
