The threads on the external hexagonal screws are generally fine-threaded ordinary threads, and the round-threaded ordinary hexagonal external hexagonal screws have good self-pinning properties. They are mainly used for thin-walled parts and also widely used when under impact, vibration or alternating loads.
Why hexagon socket screws are widely used in mechanical equipment?
The threads on the external hexagonal screws are generally fine-threaded ordinary threads, and the round-threaded ordinary hexagonal external hexagonal screws have good self-pinning properties. They are mainly used for thin-walled parts and also widely used when under the impact, vibration, or alternating loads.
Generally, external hexagonal screws are partially threaded, and full-threaded external hexagonal screws are mainly used for external hexagonal diameters with short nominal lengths and occasions requiring longer threads. Hexagonal screws with holes are used in situations that require external hexagonal screw locking. Hexagon screws with reamed holes can accurately fix the relative position of the connected parts. And can be sheared and squeezed by the force of the die.
The advantage of the outer hexagon is that the pre-tightening contact area is large, and a large pre-tightening force can be used. It is generally used on large equipment, and the price is lower than that of the inner hexagon. The disadvantage is that it occupies a large space and cannot be used in counterbores.
Hexagon socket screws are often used in machinery. They are easy to fasten and disassembled, and not easy to slip angle. Allen wrenches generally have a 90° turn. One end is long and the other is short. When screwing with the short side, holding the long side can save a lot of force and tighten the screws better. The long end has a round head (a hexagonal cylinder is similar to a sphere) and a flat head. The round head can be easily slanted in and disassembled to install some parts that are not convenient for wrenching.
The manufacturing cost of the outer hex is much lower than that of the inner hex. Its advantage is that the screw head (the position of the wrench) is thinner than the inner hex. In some places, the inner hex can not be replaced. In addition, machines with low cost, low power strength, and low precision require much fewer internal hexagon screws than external hexagons.
The advantage of the inner hexagon is that it takes up a small space and can be used as a countersunk head. It is generally used in small equipment. The disadvantage is that the pre-tightening contact area is small and too much pre-tightening force cannot be used. The price is a bit more expensive. There is no full thread beyond a certain length. Why hexagon socket screws are widely used in mechanical equipment?
1. Bear more load
Hexagon socket bolts have six stress surfaces, which are more able to handle screwing than slotted screws and cross-shaped screws with only two surfaces.
2. The nut can be dealt with
The entire nut sinks into the workpiece, which can keep the surface of the workpiece smooth and beautiful.
3. Easy to install
Compared with the outer hexagonal screw, the inner hexagon is suitable for more assembly occasions, especially the narrow ones. Therefore, it is very convenient for assembly and maintenance, and it is also convenient for debugging.
4. Not easy to disassemble
The tools we usually use are adjustable wrenches, screwdrivers, and open wrenches, and special wrenches must be used to remove the hexagon socket bolts. Therefore, it is not easy for ordinary people to disassemble, which is also a benefit.