The variety of fasteners, broadly divided into the following categories:
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① Bolts
A type of fastener consisting of a head and a screw (a cylinder with external threads) is to be fitted with a nut for fastening the connection of two parts with through holes. This type of connection is called bolting. If the nut is screwed down from the bolt, the two parts can be separated, so the bolt connection is a detachable connection.
② stud
No head, only the two ends are threaded with a class of fasteners. When connecting it, one end must be screwed into the part with the internally threaded hole, the other end through the part with the through hole, and then screwed on the nut, even if the two parts fastened together into a whole. This type of connection is called a stud connection and is also a detachable connection. Mainly used for one of the connected parts of the larger thickness, compact structure, or due to frequent demolition, should not be bolted to the occasion.
③ screws
But also by the head and the screw part of the composition of a class of fasteners, according to use can be divided into three categories: machine screws, set screws, and special purpose screws. Machine screws are used primarily for fastening connections between a threaded hole part and a part with a through hole, without the need for a nut fit (this type of connection is referred to as a screw connection or a detachable connection; Used with nuts for fastening connections between two parts with through holes.) The set screw is used primarily to hold the relative position between two parts. Special purpose screws are used for hoisting parts such as eyebolts.
④ nut
With a screw hole, the shape of the general showed a flat hexagonal cylindrical shape, there are flat square cylindrical or flat cylindrical, with bolts, studs or machine screws for fastening the two parts connected to make it one overall.
⑤ self-tapping screws
Similar to the machine screw, but the thread on the screw is a dedicated thread for tapping screws. For fastening the connection of two thin metal components, making it a whole, the components need to make holes in advance, due to the high hardness of the screw can be directly screwed into the hole in the component, the component Forming a responsive internal thread. This type of connection is also a detachable connection.
⑥ wood screws
Similar to the machine screw, but the screw on the screw thread for the special wood screws can be directly screwed into the wood components (or parts), for a hole with a metal (or non-metallic) parts and a wood component Solid-connected together. This connection also belongs to the removable connection.
⑦ washers
The shape was a flat ring of a class of fasteners. The surface between the support surface of the bolt, the screw or the nut and the surface of the connecting part acts to increase the contact surface area of the connected part, to reduce the pressure per unit area and to protect the surface of the connected part from being damaged; the other type of elastic washer, But also play a role in preventing the nut back loose.
⑧ retaining ring
For the machine, equipment, shaft groove or slot, the block to play on the axis or hole on the part of the role of moving around.
⑨ pin
Mainly for parts positioning, and some are also available for parts to connect, fixed parts, power transmission or locking other fasteners used.
⑩ rivets
A fastener of the type consisting of a head and a nail for fastening the parts (or members) connecting the two through-holes to make them integral. This form of connection is called rivet connection, or riveting. And non-removable connection. Because the two parts to be joined together must be separated, the rivet on the part must be destroyed.
