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The chain in use on modern bicycles has a 1 ⁄ 2 inch (12.7 mm) pitch, which is the distance from one pin center to another, ANSI standard #40, where the 4 in "#40" indicates the pitch of the chain in eighths of an inch; and ISO standard 606 (metric) #8, where the 8 indicates the pitch in sixteenths of an inch.
Roller chain and sprocket The sketch of roller chain, Leonardo da Vinci, Codex Atlanticus. Roller chain or bush roller chain is the type of chain drive most commonly used for transmission of mechanical power on many kinds of domestic, industrial and agricultural machinery, including conveyors, wire- and tube-drawing machines, printing presses, cars, motorcycles, and bicycles.
The following is a list of straight-chain alkanes, ... C 40 H 82: n-tetracontane: 41 165 351 455 535 782: ... 8.389 999 420 170 75 ...
41 is: the 13th smallest prime number. The next is 43, making both twin primes. the sum of the first six prime numbers (2 + 3 + 5 + 7 + 11 + 13). the 12th supersingular prime [1] a Newman–Shanks–Williams prime. [2] the smallest Sophie Germain prime to start a Cunningham chain of the first kind of three terms, {41, 83, 167}.
40 (forty) is the natural number following 39 and preceding 41. Though the word is related to four (4), the spelling forty replaced fourty during the 17th century [ 1 ] [ 2 ] and is now the standard form.
QF 6 inch Mk I - III 40-caliber United Kingdom: 1892 - 1945 152.4 mm (6.00 in) Type 41 6 inch 40 caliber Japan: 1908 - 1945 152.4 mm (6.00 in) 15 cm/45 41st Year Type Japan: 1904 - 1945 152.4 mm (6.00 in) 15 cm/50 41st Year Type Japan: World War I - World War II 152.4 mm (6.00 in) 6 inch 35 caliber naval gun 1877 Russian Empire: 1880s - 1910s
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