A Square Nut is a four-sided nut. Compared to standard hex nuts, square nuts have a greater surface in contact with the part being fastened, & therefore provide greater resistance to loosening.
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Hex bolts are used to fasten two or more parts together to form an assembly either because it cannot be manufactured as a single part or to allow for maintenance & repair disassembly.
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Hex Head bolts, also called hexagon screw head bolts, hex cap bolts, hex-cap screws, or machine bolts, are a very common choice when it comes to construction & repair.
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Also commonly known as lag bolts, lag screws are some of the toughest fasteners. These extremely sturdy fasteners are usually used to connect heavy lumber or other heavy materials that are bearing an intense load.
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This is also a continuous or phonographic spiral groove, but it differs from the stock finish in that the groove typically is generated using a 90-deg tool which creates a V geometry with 45° angled serration.
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The Ring Type Joint #Flanges are typically used in high pressure (Class 600 and higher rating) and/or high-temperature services above 800°F (427°C). They have grooves cut into their faces which #steel ring gaskets.
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The purpose of a RF flange is to concentrate more pressure on a smaller gasket area and thereby increase the pressure containment capability of the joint. Diameter and height are in ASME B16.5 defined, by pressure class and diameter. #Flanges#MicroMetals#UsagOfFlanges
Flat Faced #Flanges are used in low pressure and temperature environments such as water treatment or pump suction flanges. Flat face flanges are usually common when the piping or piping components are brittle such as plastic,fiberglass or cast iron. #FlatFacedFlanges#FlangesType