Machine screws have machine threads for use with a nut or in a tapped hole. Also referred to as a stove bolt. Machine screws are also made with socket heads , in which case they may be referred to as socket head machine screws

A socket cap screw, also known as a socket head capscrew, socket screw or Allen bolt, is a type of cap screw with a cylindrical head and hexagonal drive hole

A washer is a thin plate (typically disk-shaped) with a hole (typically in the middle) that is normally used to distribute the load of a threaded fastener, such as a screw or nut. Other uses are as a spacer, spring (belleville washer, wave washer), wear pad, preload indicating device, locking device, and to reduce vibration (rubber washer). Washers usually have an outer diameter (OD) about twice the width of their inner diameter (ID)

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