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A few sizes are close enough to interchange for most purposes, such as 19 mm (close to 3 ⁄ 4 inch (19.05 mm)), 8 mm (close to 5 ⁄ 16 inch (7.94 mm)) and 4 mm (close to 5 ⁄ 32 inch (3.97 mm)). In reality, a wrench with a width across the flats of exactly 15 mm would fit too tightly to use on a bolt with a width across the flats of 15 mm.
Parallel keys are the most widely used. They have a square or rectangular cross-section. Square keys are used for smaller shafts and rectangular faced keys are used for shaft diameters over 6.5 in (170 mm) or when the wall thickness of the mating hub is an issue. Set screws often accompany parallel keys to lock the mating parts into place. [3]
Hex keys are best known as "Allen keys" or "Allen wrenches" in English-speaking countries like the UK, Australia, Canada and the U.S. and in Spanish-speaking countries such as Spain and Mexico (The "Allen" name is a registered trademark, originated by the Allen Manufacturing Company of Hartford, Connecticut, circa 1910. [1]
ISO general purpose metric screw threads – Part 5: Nominal sizes for 1 mm and 1,25 mm fine pitch threads; nominal diameter from 7,5 mm to 200 mm: Active: DIN 13-6: ISO general purpose metric screw threads – Part 6: Nominal sizes for 1,5 mm fine pitch threads; nominal diameter from 12 mm to 300 mm: Active: DIN 13-7
An exception to this is 4 mm hex keys, which are almost the exact same size as 5 ⁄ 32 in (3.97 mm). In many industries, this makes 4.0 mm ( 5 ⁄ 32 in) hex keys preferred for consumer products because end users can successfully use an imperial key on a metric fastener, and vice versa.
An adjustable spanner (UK and most other English-speaking countries), also called a shifting spanner (Australia and New Zealand) [1] or adjustable wrench (US and Canada), [a] is any of various styles of spanner (wrench) with a movable jaw, allowing it to be used with different sizes of fastener head (nut, bolt, etc.) rather than just one fastener size, as with a conventional fixed spanner.
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A standard metric (concrete) block is 190 mm wide, 390 mm long, and 190 mm high, which allows for 10 mm mortar joints in between bricks, giving a standard unit size of 200 mm square by 400 mm long. [3] A standard metric brick is 90 by 57 by 190 mm; with 10 mm of mortar, that produces a standard unit of 100 mm x 200 mm. [3]
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