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Fastener Types Table: Bolts, Nuts, Screws, and Beyond

Last updated:
May 29, 2024
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Table Of Contents

NameSchematicDescription
BoltA type of fastener consisting of a head and a screw (a cylinder with an external thread), which needs to be used in conjunction with a nut to fasten two parts with through-holes. This type of connection is called a bolt connection.
StudA type of fastener without a head, having external threads on both ends. During connection, one end must be screwed into a part with an internal threaded hole, and the other end passes through a part with a through-hole, then a nut is screwed on, thus fastening the two parts into one whole. This type of connection is called a stud connection and is also a detachable connection. It is mainly used in situations where one of the parts to be connected is thick, requires a compact structure, or should not use bolt connections due to frequent disassembly.
ScrewA type of fastener consisting of a head and a screw, which can be divided into three categories according to their use: machine screws, set screws, and special-purpose screws. Machine screws are mainly used for fastening connections between a part with an internal threaded hole and a part with a through-hole, without the need for a nut (this type of connection is called a screw connection and is also a detachable connection); they can also be used with a nut for fastening connections between two parts with through-holes. Set screws are mainly used to fix the relative position between two parts. Special-purpose screws include eye screws, which are used for lifting parts.
NutWith an internal threaded hole, generally shaped like a flat hexagonal column, also available in flat square or flat cylindrical shapes, used in conjunction with bolts, studs, or machine screws to fasten two parts together into one whole.
Self-tapping screwSimilar to machine screws, but the threads on the screw are specialized for self-tapping screws. Used for fastening two thin metal components together into one whole, a small hole must be pre-made in the components, and because these screws are quite hard, they can be directly screwed into the component’s hole, forming corresponding internal threads. This type of connection is also a detachable connection.
Wood screwAlso similar to machine screws, but the threads on the screw are specialized for wood screws, which can be directly screwed into wooden components (or parts) to fasten a metal (or non-metal) part with a through-hole to a wooden component. This type of connection is also a detachable connection.
WasherA flat ring-shaped type of fastener, placed between the support surface of a bolt, screw, or nut and the surface of the connected part, serving to increase the contact surface area of the connected part, reduce the pressure per unit area, and protect the surface of the connected part from damage; another type of elastic washer also serves to prevent the nut from loosening.
Retaining ringUsed for installation in the shaft groove or hole groove of machines and equipment, serving to prevent the movement of parts on the shaft or in the hole.
PinMainly used for positioning parts, some can also be used for connecting parts, fixing parts, transmitting power, or locking other fasteners.
RivetA type of fastener consisting of a head and a shank, used to fasten two parts with through-holes together into one whole. This type of connection is called a rivet connection, or simply riveting. It is a non-detachable connection. To separate the two connected parts, the rivet on the parts must be destroyed.
AssemblyRefers to a type of fastener supplied in combination, such as machine screws (or self-tapping screws) supplied in combination with flat washers (or spring washers, locking washers).
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