Edlund S260SP

SCREW G-2 NSF KNURLED W/ORING

Manufacturers, regulators and restaurant operators look to NSF International for the development of public health standards and certification programs that help protect the world’s food, water, commercial and consumer products, and the environment. As an independent, accredited organization, their standards group facilitates the development of standards, and the service groups test and certify products and systems including all sorts of restaurant equipment and accessories. They also provide auditing and risk management solutions for public health and the environment.

A screw is a type of fastener, in some ways similar to a bolt typically made of metal, and characterized by a helical ridge, known as a male thread (external thread). Screws are used to fasten materials by digging in and wedging into a material when turned, while the thread cuts grooves in the fastened material that may help pull fastened materials together and prevent pull-out.

A screw drive is a system used to turn a screw. At a minimum, it is a set of shaped cavities and protrusions on the screw head that allows torque to be applied to it. Usually, it also involves a mating tool, such as a screwdriver, that is used to turn it. Other examples include Phillips head screws and screwdrivers, and Allen hex screws and wrenches.