Metal shrapnel is made of ultra-thin (0.05mm-0.1mm thickness) and ultra-thick (generally high hardness) stainless steel 301 or 304 materials. Metal shrapnel is an important part of the switch. Metal shrapnel is mainly used in membrane switches, contact switches, PCB boards, FPC boards, medical devices and other products
Working principle of metal shrapnel: the metal shrapnel on the film key is located at the conductive part of the PCB board (most of which are located above the gold finger on the circuit board). When pressed, the center point of the shrapnel is concave and contacts the circuit on the PCB, forming a circuit. The whole product can work normally when the current passes through
General conventional metal shrapnel can be divided into round metal shrapnel, cross metal shrapnel, triangular metal shrapnel and oval metal shrapnel according to their different shapes. The diameter ranges from 3mm to 20mm and the force ranges from 100g to 600gf. Of course, if you have special requirements to make according to your drawings, there is no problem
In addition, according to the requirements of customers for resistance, our metal shrapnel also has various surface treatments such as nickel plating, silver plating, gold plating and so on.