Machine Screws, also referred to as Machine Bolts, are often used with nuts or driven into tapped holes. They come in a variety of head types and drive styles, but are generally available in smaller sizes.
Nonconductive and resistant to many corrosives, Fiberglass is a good choice for applications threatened by salt water, oils, mild solvents, and other harsh environments. G-10 is a glass reinforced fiberglass, utilizing a continuous woven glass fabric laminated with an epoxy resin. The glass reinforcing increases tensile strength over non-reinforced fiberglass, G-10 in particular is rated at 38,000 psi (pounds per square inch range). G-10 exhibits a high tensile strength to weight ratio, approximately twice that of Aluminum 2024, for example. G-10 is very non-porous, and will only absorb 0.1% of water if left to soak for 24 hours. G-10 is flame retardant and will operate at temperatures up to 280 degrees without degrading. This material is recommended for applications where superior strength and excellent electrical insulative properties are required over a wide range of temperatures.
Pan head fasteners have a low, large cylindrical head with a high rounded top edge for higher tightening torques - these fasteners are often recommended to replace older head styles such as round, binding, or truss-head where possible. Common applications for slotted screws include woodworking, although the drive style is not designed to be used with power drivers.
A threaded fastener's size name includes information about the major external diameter, followed by the threads per inch, which indicates if it is coarse or fine.