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A pyrotechnic fastener (also called an explosive bolt, or pyro, within context) is a fastener, usually a nut or bolt, that incorporates a pyrotechnic charge that can be initiated remotely. One or more explosive charges embedded within the bolt are typically activated by an electric current, and the charge breaks the bolt into two or more pieces.
A tool is considered low velocity if the average test velocity of the fastener is not in excess of 300 ft/s (91 m/s) with no single test having a velocity of over 108 m/s (350 ft/s). [1] A high velocity tool propels or discharges a stud, pin, or fastener in excess of 300 ft/s (91 m/s). [1]
A fastener (US English) or fastening (UK English) [1] is a hardware device that mechanically joins or affixes two or more objects together.
When the fastener is tightened, the base of the nut, which is arched, elastically deforms and applies a force to the fastener, which locks it from loosening under vibrations. [ 1 ] There are many different types of speed nuts, mostly dependent on the shape of the nut, how it attaches to the workpiece, and what type of screw can be used.
Thread-locking fluid or threadlocker is a single-component adhesive, applied to the threads of fasteners such as screws and bolts to prevent loosening, leakage, and corrosion. Most thread-locking formulas are methacrylate -based and rely on the electrochemical activity of a metal substrate to cause polymerization of the fluid.
The velocity of electromagnetic waves in a low-loss dielectric is given by [1]: 346 = =.. where = speed of light in vacuum. = the permeability of free space = 4π x 10 −7 H/m.