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British Association screw threads, or BA screw threads, are a set of small screw threads, the largest being 0BA at 6 mm diameter.They were, and to some extent still are, used for miniature instruments and modelling.
The screw is fastened by hitting the head with a hammer and is not intended for removal. [2] drywall screw: Specialized screw with a bugle head that is designed to attach drywall to wood or metal studs, but it is a versatile construction fastener with many uses. The diameter of drywall screw threads is larger than the grip diameter. eye screw ...
For a screw, this is its outside diameter (OD). The major diameter of a nut cannot be directly measured (as it is obstructed by the threads themselves) but it may be tested with go/no-go gauges. The major diameter of external threads is normally smaller than the major diameter of the internal threads, if the threads are designed to fit together.
The major diameter may be slightly different from the shank diameter, which is the diameter of the unthreaded part of the screw. The diameters are sometimes given approximately in fractions of an inch (e.g. the major diameter of a #6 screw is 0.1380 in, approximately 9 ⁄ 64 in = 0.140625 in. The pitch P is the distance between thread peaks.
Sizes are proportional, so a size "1" is ten percent smaller in diameter that a size "0", while a size −1 is ten percent larger than a size "0". The Thury thread was believed to be the first thread form to solve the problem of creating a single system of screw dimensions applicable to all sizes. [2]
Robertson screwdrivers are easy to use one-handed, because the tapered socket tends to retain the screw, even if it is shaken. [3]: 85–86 They also allow the use of angled screwdrivers and trim-head screws. The socket-headed Robertson screws are self-centering and reduce cam out. They also stop a power tool when set, and can be more easily ...
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