Flange Bolt soedinenie.Raschet soedineniya.Bolt (from the German. Bolt), fastener, usually a rod with a 6-sided or square-head screw for screwing the nuts. In terms of machine parts more general concept fastener is a screw. Loosen the screws, depending on the type of threaded connection is used the following versions: 1) the screws and nuts, commonly called bolts; 2) screws, screw-fastened to one of the parts. Bolts used: a) to bond parts are not very thick, plates, flanges, bars in the presence of space for the location of the bolt head and nut, and b) to bond the parts from materials that do not provide sufficient reliability and durability of the thread, and c) when the need for frequent screwing and unscrewing.
In bolts, screws, studs used metric thread, which is the main thread and has a triangular profile angle at the vertex 600. Metric threads are divided into large and small steps. Profiles of geometrically similar. Adopted for the main thread with a big step. The static load carrying capacity of this thread above and less effect on strength protovleniya errors and wear than fine pitch thread. Endurance limit of high-strength steel screws decreases with decreasing pitch, and screws (bolts) of low-carbon steels increases. The technical background literature, standardized and most widely fasteners with the name 'BOLT' regardless of whether they will be fastened with a nut or screwed into the part. The shape of the head bolts (screws) are divided to: a) capture tool outside the head (hexagon or square), b) Chisels inside and from the end of the head (with Allen), and c) prevent the crank (with protrusions, is laid in nests or with two parallel edges, is laid in the grooves).