Screw types: Screws are basically divided into two cate […]
Screw types: Screws are basically divided into two categories: wood screws and machine screws; however, they can be divided into many categories according to different uses; machine screws can be divided into vertical fastening screws and horizontal expansion screws; It can be divided:
A: Triangular thread (60 degrees): Combine/lock/expand
B: Triangular thread for pipes (55 degrees): Join/lock 3)
C: Trapezoidal thread (30 or 29 degrees): power transmission
D: Square thread (90 degrees): power transmission
The difference between screws, screws, and screws. Screws are also called "screws" (screws) and "screws" (screw rods). In fact, screws are generic names, and screws and screw rods are different from each other. Screws are generally called wood screws; they are those with a pointed tip and have a larger pitch. They are generally used to fasten wooden and plastic parts. The screw rod is a machine screw (machine screw), which has a flat front end. The pitch is small and uniform. It is generally used to fasten metal and machine parts.
Bolt: A type of fastener consisting of a head and a screw (cylinder with external thread). It needs to be matched with a nut to fasten and connect two parts with through holes. This type of connection is called bolt connection. If you unscrew the nut from the bolt, you can separate the two parts, so the bolt connection is a detachable connection.
Bolt connection, double-end stud connection and screw connection are the basic types of threaded connection fasteners. They are different in structure and application. Structurally: bolts have multiple styles of "heads"; studs have no "heads"; screws also have multiple styles of "heads", but the "head" structure is different, and the "heads" of screws generally have fastening Used grooves, inner hexagons, etc., screws that can be tightened by hand will roll patterns on the "head". This makes the size of the screw smaller. Application: Bolts are generally used in pairs with nuts for through holes, which are easy to replace after damage; studs are also generally used with nuts, mostly for blind holes, and the connected parts need to be removed frequently; screws are also mostly used for blind holes , When disassembled by the connecting piece Heng Shao. Basically, if a bolt is used to connect a blind hole, there is nothing wrong.