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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.
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Basic Erector parts included various metal beams with regularly spaced holes for assembly using nuts and bolts. A frequently promoted patented feature was the ability to fabricate a strong but lightweight hollow structural girder from four long flat pieces of stamped sheet steel, held together by bolts and nuts (US Patent 1,066,809).
A special type of bolt that is set into concrete, with screw threads protruding above the concrete surface to accept a nut. breakaway bolt: A breakaway bolt is a bolt with a hollow threaded shank, which is designed to break away upon impact. Typically used to fasten fire hydrants, so they will break away when hit by a car. Also used in aircraft ...
The model, the largest at the time, was 6.5 metres (21 feet) high, weighs 544 kilograms (1,199 pounds), was made from 19,507 pieces, 50,560 nuts and bolts, and took 1,239 hours to construct. [32] At this mass and size, some deviation from Meccano-only parts was a necessity, to prevent it collapsing (mainly in the structural spokes).
A heavy-duty T-slot nut with a M12 bolt is rated to support 10000 N (about 1 imperial ton at rest). [ 2 ] Profile 40×40 (40 mm by 40 mm, with 8 mm grooves) extruded aluminum profile and the T-slot nuts to fit into them comprised the first modular system developed for use in mechanical engineering in 1980 by item Industrietechnik. [ 3 ]
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