DIN923 slotted screw slotted shoulder screw slotted step screw

The existing combination screws and accessories are processed separately and handed over to customers for assembly, which can easily cause assembly problems. Additionally, identification marks need to be added to both the combination screws and accessories, which increases production costs.

Screws are a common type of connector that utilizes the physical and mathematical principles of oblique circular rotation and friction of objects to gradually tighten the mechanical components of objects. Screws are essential industrial necessities in daily life, such as tiny screws used in cameras, glasses, clocks, electronics, etc; General screws for television, electrical products, musical instruments, furniture, etc; As for engineering, construction, and bridges, large screws and nuts are used; Transportation equipment, airplanes, trams, cars, etc. are used with both large and small screws. Screws bear important tasks in industry, and as long as there is industry on Earth, the function of screws will always be important. The screw has been a common invention in people's production and life for thousands of years, and according to its application field, it is a great invention of humanity. Traditional screws are usually set with one end as the screw head and the other end as the screw rod, which fits with the external nut and fastens the connecting parts between the screw head and the nut. However, for some household appliance modules, chassis, and other appliances, traditional screw fixed modules and cabinets often fasten many components together through screws. During maintenance, it is very troublesome to disassemble all components of the maintenance area. Therefore, there is a need for a new screw structure that can connect both ends and achieve layered installation. When repairing, only the connecting layer of the repaired part needs to be disassembled, and both the external and internal parts do not need to be disassembled.

The purpose of Guangdong Yueluo Hardware Industry Co., Ltd. is to provide a kind of cement screw that is easy to install and can be disassembled in view of the above shortcomings of the cement screw that cannot be disassembled and the initial installation of Wall plug is not convenient. Guangdong Yueluo Hardware Industry Co., Ltd. is a cement screw, which is achieved by the following technical solution. Cement screws are composed of a nail tip and a nail body, and there is a thread at the back of the nail body. This thread can be either internal or external. When using, use a hammer to nail the cement screw into the cement, which can be freely screwed in or out with ordinary screws or nuts to install and fix objects. Compared with existing technology, Guangdong Yueluo Hardware Industry Co., Ltd. has the advantage of having internal or external threads at the back of the cement screw body, which not only facilitates initial installation, but also allows for repeated disassembly of the installed objects. Used as a fastener for installing objects that may need to be disassembled on cement"

In specific implementation, the axial solid shape of the nut and the screw head is in the form of a Pentagonal pyramid table, the tightening surface of the screw is parallel to the center line of the bolt, and the upper contour line of the screw is arc shaped; The screw can be fully threaded or partially threaded; The top shape of the screw head is circular.

Ordinary T-shaped bolts have a rectangular head and a T-shaped screw part that is smaller than the width of the opening part of the T-shaped groove. This allows the head of the T-shaped bolt to be inserted into the T-shaped groove from any position along the length direction of the T-shaped groove. When fixing the workpiece, rotate the T-shaped bolt 92 degrees to make the length direction of the head perpendicular to the T-shaped groove and hook onto the inner side of the opening part of the T-shaped groove, Fix the workpiece by tightening the nut screwed onto the T-bolt screw. The T-shaped bolt of this structure can easily connect the bolt with the basic component quickly and has been widely used, but there are also some shortcomings. Due to the small contact area between the head of the T-shaped bolt and the inner side of the T-shaped groove opening, the frictional resistance is correspondingly small. On the one hand, the bolt is easy to rotate during the tightening process, and on the other hand, it is often affected by external forces or vibrations during use after tightening, Causes bolts to loosen easily, resulting in unreliable connections.