Standard flat washer have two main purposes: To distrib […]
Standard flat washer have two main purposes:
To distribute the pressure of the nut evenly over the surface, so that the surface isn't damaged, and
To ensure that the nut is pressed against a smooth surface, reducing the chance that it'll gradually loosen because it's in contact with an uneven surface
These washer-head screws are recommended for the majority of applications. Their large head provides maximum bearing surface, helping to ensure the strongest joint possible.
Unlike basic drywall screws with wedge-shaped heads prone to splitting wood, Kreg Screws feature large flat heads designed to seat firmly in the bottom of the pocket hole. This dramatically improves overall joint strength and prevents the wood from splitting. Kreg Screws are available in two head styles, which are highlighted below.
To keep bolted connections tight, we can choose from several methods. The most common is the insertion of a locking device between the rotating part (nut) and the parts being fastened (i.e., bus bars). That locking device often is a split-ring lockwasher.
Some assemblies are designed to have the parts move with respect to one another when the bolt is actually tight. The travel of the nut may be restricted by a shouldered design of the bolt or a sleeve can be installed around the bolt in the hole. In these cases a washer is often used to keep the moving part from wearing the bolt head or nut. The washer may be made of a material designed to reduce the friction between itself and the moving part. This can also help to keep a turning part from trying to loosen the nut through friction.