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The Whitworth thread was the world's first national screw thread standard, [1] devised and specified by Joseph Whitworth in 1841. Until then, the only standardization was what little had been done by individual people and companies, with some companies' in-house standards spreading a bit within their industries.
For a taper thread, it is the diameter at the "gauge length" (plus/minus one thread pitch) from the small end of the thread. The taper is 1:16, meaning that for each 16 units of measurement increase in the distance from the end, the diameter increases by 1 unit of measurement.
The pitch of 0BA is 1 mm and the pitch of each higher numbered thread is obtained by multiplying the pitch of the lower number by 0.9 so K-BA has a pitch of p = 0.9 K [4]: 12 rounded to two significant figures in mm. The major diameter is given by 6p 1.2, [4]: 12 rounded to two significant figures in mm and the hex head size (across the flats ...
16 A plug and socket: Pins which are 5 mm in diameter, the centres spaced 26 mm apart. The 16 A three-pin earthed rear entry plug is designated CEI 23-50 S 17 (there are also two side-entry versions, SPA 17 and SPB 17). The 16 A two-pin unearthed plug is designated CEI 23-50 S 16. The 16 A three-pin earthed socket is designated CEI 23-50 P 17 ...
The male plug has a center pin that is 1 ⁄ 8 inch (3.175 mm) in diameter, and is surrounded by an outer shell that is 1 ⁄ 3 inch (8.47 mm) in diameter. Disadvantages [ edit ]
They are typically about 1 inch (25 mm) long. For example, a 1 ⁄ 4-inch to 3 ⁄ 8-inch adapter allows sockets with 1 ⁄ 4-inch drive holes to attach to a 3 ⁄ 8-inch ratchet, and so on. Universal joints are two articulated socket joints (about 1 inch (25 mm) long) combined at a right angle, that allow a bend in the turning axis of the ...
Example (metric coarse): For M7.0×1.0, major minus pitch yields 6.0, but 6.1 also works well. Example (metric fine): For M7.0×0.5, major minus pitch yields 6.5, which at 92.9% happens to be an example that pushes over the outer bound of the 90% ± 2 pp , but major minus pitch is still valid, although smaller drills (6.3 mm, 1 ⁄ 4 , 6.4 mm ...
In 1989 a new version was designed to be compatible with the Europlug. Newer sockets have 4.5 mm holes with centres spaced 19 mm apart. The minimum distance between the holes is thus 14.5 mm, while the minimum distance between the converged pins on the Europlug is 13.5 mm, allowing it to grip the socket despite its smaller pin width.