Sen Yi fasteners are various screws used on panels: non loosening screws, also known as spring screws. Loose screws can be riveted onto iron plates and can be screwed in and out And the integral part can be firmly embedded in the panel without detaching from the panel, so it is also called a non dislodging screw. The outer circle of the hand screw sleeve is usually pressed with straight teeth for easy hand tightening or manual tightening, so it is also called hand tightening screw or hand tightening screw.
Loose panel screws (spring screws) can be used to install PCB boards, occupying only a small space. The rivet sleeve of the hand tight screw has embossed teeth and is pressed into the chassis or thin plate hole (note: the drilling hole diameter of the thin plate corresponds to the pressing tooth diameter of the spring screw, please refer to the following technical parameters), forming an exposed spring screw that can be manually screwed on the other end (i.e. the hand screwed end) Because there is a spring fixed inside, the screw moves back and forth relative to the other end of the thin plate. This solution solves the problem of frequent disassembly of screws and is very convenient and practical.
There are many types of screws that cannot be loosened, and the following are the commonly used ones:
(1) PF09/PF10 hand tightening screws
(2) PF11/PF12 non loosening screws
(3) PF21/PF22 panel screws
(4) PF30/31/32 spring screw
(5) PFC2P spring screw
(6) PF41/PF42 screws that cannot be loosened
(7) PF16/PF26 panel screws
(8) PFS2/PFC2 does not come out of the screw
(9) PF50/PF60 spring screws
(10) PFHV rivet combination screw
Components of non loosening screws/spring screws:
1. Screw part: used to fasten the other end of the chassis thin plate, usually made of carbon steel and stainless steel, with a cross or straight groove on the head to facilitate tool tightening.
2. Hand twisted sleeve: usually straightened with patterns, made of aluminum, sometimes requiring aluminum oxidation blackening as needed.
3. Rivet sleeve: Rivet it to the panel and rely on it.
4. Spring: facilitates the extension and retraction of screws and prevents the entire component from coming out.
After each component is produced, it is assembled as a whole and the hand screw part is pressed together with the rivet part through a spring to form a complete and unbreakable spring panel screw.
Loose screws are suitable for:
1. Stainless steel plate, metal steel plate, galvanized steel plate, engineering installation.
2. Metal curtain walls, metal light partitions, and other indoor and outdoor installations.
3. Generally, angle steel, channel steel, iron plate are installed in combination with other metal materials.
4. Assembly projects for automobile containers, shipping containers, shipbuilding industry, refrigeration equipment, etc.
The panel screw is called a non loosening screw because the head of the product has a ring of embossed teeth, which will not fall off when screwed in or out of the thread after riveting installation, occupying very little space and filling the installation error between the base fitting holes. Due to its straight embossed design on the head, it can be tightened directly by hand, hence it is called a hand tightening screw.