wholesale wafer truss head drilling screw,wholesale window screw,wholesale wood screw

It usually includes the following 13 types of parts

Bolts: A class of fasteners consisting of two parts: a head and a screw (a cylinder with external threads), which need to be fitted with a nut and used to fasten two parts with through holes. This form of connection is called bolt connection. If the nut from the bolt screw down, there can make the two parts apart, so the bolt connection is a removable connection.

Stud: There is no head, only a class of fasteners with external threads on both ends. When connected, one end of it must be screwed into the parts with internal threaded holes, the other end through the parts with through holes, and then screwed on the nut, even if the two parts are fastened and connected into a whole. This type of connection is called a stud connection and is also a removable connection. Mainly used for one of the connected parts thickness is large, requires a compact structure, or because of frequent disassembly, should not be used for bolting occasions.

Screw: also consists of the head and screw two parts of a class of fasteners can be divided into three categories according to the use of machine screws, set screws and special purpose screws. Machine screws are mainly used for a fastening threaded hole parts, and a fastening connection between parts with a through hole, without the need for a nut with this form of connection is called a screw hit connection, also belongs to the detachable imperial connection: can also be used with a nut for fastening connection between two parts with a through hole.) Fastening screws are mainly used to fix the relative position between two parts. Special purpose screws, such as ring screws, are used for lifting parts.

Nuts: with internal thread hole, the shape is generally shown as flat hexagonal column, but also flat square column or flat cylindrical, with bolts, studs or machine screws, used to fasten the connection of two parts, so that it becomes a whole.

Self-tapping screws: similar to machine screws, but the thread on the screw is a special thread for self-tapping screws. It is used to fasten and connect two thin metal parts to make a whole part. Small holes need to be made in advance on the part, and because of the high hardness of this screw, it can be screwed directly into the hole of the part to form a responsive internal thread in the part.

Wood screw: also similar to machine screw, but the thread on the screw is a special wood screw with threads can be screwed directly into the wooden components (or parts), used to connect a metal (or non-metal) parts with a through hole and a wooden component fastened together. This connection is also a removable connection.

Gasket: the shape of a flat ring-shaped class of fasteners. Placed in the bolt, screw or nut support surface and connected parts between the surface, playing a role in increasing the contact surface area of the connected parts, reduce the pressure per unit area and protect the surface of the connected parts from damage: another type of elastic washer, but also play a role in blocking the nut back loose.

Retaining ring: for installation in the machine, equipment, shaft groove or hole groove, playing a role in preventing the shaft or hole on the parts to move around.

Pin: mainly for parts positioning, some can also be used for parts connection, fixed parts, power transmission or lock other fasteners.

Rivet: a class of fasteners consisting of two parts: the head and the nail bar, used to fasten the connection of two parts (or components) with through holes, so that it becomes a whole. This form of connection is known as riveted connection is referred to as riveted. It is a non-removable connection. Because the two parts connected together to separate, you must destroy the rivets on the parts.

Combination parts and connection vice: combination parts refers to the group table supply of a class of fasteners with the same piece, such as a machine screw (or bolt, self-provided screwdriver and flat washers (or spring washers, lock washers) combination supply connection vice refers to a special bolt, nut and washer combination supply of a class of fasteners.

Welded nail: due to light energy and nail head (or no nail head) constitutes a different type of fastener, using welding methods to connect him fixed on top of a part (or member) in order to connect with other parts again.

Summary

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