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Thread Galling - What is it? How to Avoid it.

From Accurate Screw Machine Corp. (ASM)

"Galling" or seizing of fasteners. This occurs when the surfaces of the mating parts are very abrasive. Galling occurs only on metallic fasteners, and is more likely to occur when the external threads are cut, rather than rolled

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Screws

A screw is a wide-encompassing type of hardware fastener that attributes its mechanical capabilities to the helical groove that extends around the circumference of the device's shank. These threads provide the friction and traction that serves a screw's purpose: to assemble or position two workpieces in relation to each other. While used synonymously, screws and bolts are not mechanical clones.

Captive Screws
Fasteners designed for ease of installation - often knurled for finger use - and retained within their functional environment when not engaged. Captive screw (or bolt) retention prevents loss or damage within the captive screw's parent assembly, or damage to components in the nearby working environment.
Washers
Washers are disks of metal or non-metallic material placed beneath a nut, an axle bearing, or a joint, to relieve friction, prevent leakage, isolate, prevent loosening, or distribute pressure.
Captive Fasteners
Captive fasteners are designed for permanent retention within their target assembly or housing, often even upon servicing, providing a secure joint and avoiding loss or damage that might be caused by a loose part.
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