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A 2BA thread is used to connect the metal barrel of a dart to its shaft — as such, it is one of the few common uses of this thread in North America. In the UK, 2BA threads are commonly found in the old imperial British Engineering Standards Association (BESA) conduit boxes , and 4BA threads in light switch and socket back boxes which are ...
A silver Peruvian atlatl from the 12th-15th century Atlatl in use. A spear-thrower, spear-throwing lever, or atlatl (pronounced / ˈ æ t l æ t əl / ⓘ [1] or / ˈ ɑː t l ɑː t əl /; [2] Nahuatl ahtlatl [ˈaʔt͡ɬat͡ɬ]) is a tool that uses leverage to achieve greater velocity in dart or javelin-throwing, and includes a bearing surface that allows the user to store energy during the ...
An unusually small crossbow bolt with a tapered "waist" shaft section and rear skirt compared to a 1 euro cent coin A bolt or quarrel is a dart -like projectile used by crossbows . [ 1 ] The word quarrel is from the Old French quarrel (> French carreau ) "square thing", [ 2 ] specialized use as quarrel d'arcbaleste (> carreau d'arbalète ...
The standard designation for a UTS thread is a number indicating the nominal (major) diameter of the thread, followed by the pitch measured in threads per inch.For diameters smaller than 1 / 4 inch, the diameter is indicated by an integer number defined in the standard; for all other diameters, the inch figure is given.
They are often used at the end of the threaded portion of a shaft or screw to provide clearance for the cutting tool, and also referred to as thread relief in this context. A rule of thumb is that the undercut should be at least 1.5 threads long and the diameter should be at least 0.015 in (0.38 mm) smaller than the minor diameter of the thread ...
For competitive purposes, a dart cannot weigh more than 50 g (1.8 oz) including the shaft and flight and cannot exceed a total length of 30 cm (12 in). [ 11 ] [ 12 ] They are designed to penetrate dart boards .
In oil field tubing, buttress thread is a pipe thread form designed to provide a tight hydraulic seal. The thread form is similar to that of Acme thread [10] but there are two distinct threaded portions of differing diameters and profiles, the larger having a wedging profile, with a tapered sealing portion in between the larger and smaller diameters.
Unified Inch Screw Threads (UN and UNR Thread Form) V Thread Form: 1 ⁄ 4 ″-20 UNC #4-40 UNC ASME B1.5-1997 (R2014) Acme Screw Threads: Trapezoidal Thread Form: Tr 60×9 ANSI/ASME B1.9-1973 (R2017) Buttress Inch Screw Threads: Breech-Lock Thread Form: ASME B1.10M-2004 (R2014) Unified Miniature Screw Threads: V Thread Form: 0.60 UNM ANSI/ASME ...
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