The bearing surface of a hex cap screw is flat and washer faced. An externally threaded fastener that has thread form which prohibits assembly with a nut having a straight thread of multiple pitch length is a screw. Please help improve this article by adding citations to reliable sources. Mating fasteners are known by many different names: Some sex bolts, more commonly known as "architectural bolts", have knurled barrels to allow one-sided assembly.
The sex bolt consists of a female internally threaded barrel nut and a male externally threaded screw. Unsourced material may be challenged and removed. Carriage Bolts A carriage bolt or coach bolt has a domed or countersunk head, and the shank is topped by a short square section under the head. Another common term is "grip length", which is the thickness of the material that a mating bolt can effectively fasten or clamp. Normally the length of the barrel is shorter than the thickness of the material being clamped. A rib neck carriage bolt has several longitudinal ribs instead of the square section, to grip into a metal part being fixed. The boss sits within the components being fastened, the flange provides the bearing surface. Flange Bolts Flange Bolts, also called Hex Flange Screws an sometimes Frame Bolts, incorporate a large bearing face flange into a one piece head design. Some sex bolts, more commonly known as "architectural bolts", have knurled barrels to allow one-sided assembly. The sex bolt and accompanying machine screw sit flush on either side of the surfaces being fastened. Other head styles are button, flat, grommet, hex head, large truss, low profile, oval, rivet and T-head. For the type of latch called a barrel bolt, see Latch hardware. Wikimedia Commons has media related to Sleeve nuts. Mating fasteners are known by many different names: There are many variations. The bearing surface of a hex cap screw is flat and washer faced. It is normally chosen because of its low profile compared to other nuts. Elevator Bolts Elevator bolts are similar to a carriage bolt, except the head is thin and flat. Please help improve this article by adding citations to reliable sources. Both the barrel and screw have heads designed to clamp bind material between the head of the barrel and the head of the screw, or to bridge the gap between two parts. The more thread depth, the more difficult these parts are to manufacture, and the more expensive. A sex bolt is a mating fastener combining a fastener nut with a fastener screw. They are commonly used for tie-downs, lifting and attaching cables. An externally threaded fastener which is prevented from being turned during assembly and which can be tightened or released only by torquing a nut is a bolt. The large bearing area under the head distributes clamp load over a larger area to resist fatigue loads; minimizes indentation of the head into the material being bolted together to prevent loosening; increases the heads resistance to rotation to prevent loosening in high vibration applications; and eliminates the need for a flat washer.
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