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Typical fasteners (US quarter shown for scale) A fastener (US English) or fastening (UK English) [1] is a hardware device that mechanically joins or affixes two or more objects together. In general, fasteners are used to create non-permanent joints; that is, joints that can be removed or dismantled without damaging the joining components. [2]
The connection can be made by a variety of different components: anchor bolts (also named fasteners), steel plates, or stiffeners. Anchor bolts transfer different types of load: tension forces and shear forces. [3] A connection between structural elements can be represented by steel columns attached to a reinforced concrete foundation. [4]
Steel fasteners (grade 2,5,8) - the level of strength; Stainless steel fasteners (martensitic stainless steel, austenitic stainless steel), Bronze and brass fasteners - water proof usage; Nylon fasteners - used for the light material and water proof usage. In general, steel is the most commonly used material of all fasteners: 90% or more. [8]
Tapered and needs thread sealant; for connections in nearly every type of service NPS: National pipe straight: American National Standard Straight Pipe Thread: For rigidity; sealable with o-ring or gasket; sometimes male straight is mated with female tapered for low-pressure sealing (need to verify) NPSC: National pipe straight–coupling
Fasteners are manufactured to various standards that define, among other things, their strength. Torque charts are available to specify the required torque for a given fastener based on its property class (fineness of manufacture and fit) and grade (tensile strength). Spring Analogy for a Bolted Joint
A 37° flare type end fitting for flexible hose. The AN thread (also A-N) is a particular type of fitting used to connect flexible hoses and rigid metal tubing that carry fluid.
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