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A metric ISO screw thread is designated by the letter M followed by the value of the nominal diameter D (the maximum thread diameter) and the pitch P, both expressed in millimetres and separated by a dash or sometimes the multiplication sign, × (e.g. M8-1.25 or M8×1.25).
British Standard Whitworth (BSW) is an imperial-unit-based screw thread standard, devised and specified by Joseph Whitworth in 1841 and later adopted as a British Standard. It was the world's first national screw thread standard, and is the basis for many other standards, such as BSF , BSP , BSCon , and BSCopper .
Slot screw drives have a single horizontal indentation (the slot) in the fastener head and is driven by a "common blade" or flat-bladed screwdriver.This form was the first type of screw drive to be developed, and, for centuries, it was the simplest and cheapest to make because it can just be sawed or filed.
From the BL Mark I gun of 1916 the 4.7-inch (120 mm) calibre was the mid-calibre weapon of the Royal Navy, used particularly on destroyers.Apart from some ships armed with QF 4-inch Mk V guns due to shortages, it remained the standard weapon for destroyers up to the W-class destroyers of 1943.
Screw propulsion, which relied, among other things, on the invention of an effective stern gland for the propeller shaft, worked better than paddle wheels. Higher boiler pressures of 60 pounds per square inch (410 kPa) powering compound engines, were introduced in 1865, making long-distance steam cargo vessels commercially viable on the route ...
Not all British QF guns in fact used sliding blocks – the QF 2.95-inch and QF 3.7-inch mountain guns and the QF 18-pounder used screw breeches. The thing to note is that their screw mechanism were much lighter and simpler than BL screw mechanisms and served merely to lock the cartridge in place.
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