Comparison of different materials

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If the final product requires a higher resistance value of the shrapnel, it is recommended to use stainless steel with double side nickel plated or stainless steel with single side gold plated material.

Force Test Probe

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Commonly Used Force Testing Probe

Unless otherwise specified, force test probe should be 0.3mm hard point ( Please review the screen of the pointed head).

PCB Reference

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PCB Layout Suggest

Sing Side PCB, Double Sided PCB

The values listed above are standard reference values, which depend

Double-sided PCB size parameter table

How to use

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Please visit our website www.metaldome.net

Product Introduction

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Metal dome (also known as metal dome, snap dome), (because the switch is like a pot upside down, so commonly known as the pot piece, or 'pot piece'), the English metal dome, made of stainless steel, is an important part of the switch, with the metal dome of the conductivity, between the user and the product to play a quality switch role. At the same time, the use of metal shrapnel's stable rebound force (automatic reset after pressing), its characteristics of long life, to provide users with quality tactile feedback. The material used for metal shrapnel is relatively thin (usually 0.05mm~0.15mm) stainless steel strip (steel grade usually used 301 or 304), 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. The working principle of metal shrapnel: the metal shrapnel on the membrane keypad is located in the conductive part of the PCB board (mostly located above the gold finger on the circuit board), when pressed, the center point of the shrapnel is concave and touches the line on the PCB, thus forming a circuit, the current passes through and the whole product can work normally.

The shrapnel is made of imported stainless steel, which has a low carbon content (0.08%) and high oxidation resistance. The product has passed SGS certification, providing reliable quality assurance, and complies with EU REAH regulations and RoHS directive, the product meets the requirements of environmental protection.

Working Principle of Metal Shrapnel (Pot Shrapnel)

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Please visit our website www.metaldome.net

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Commonly used fixing methods for metal dome

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1. Film adhesive paper secures the shrapnel to the flexible printed circuit board (FPC)

  



2. Soldering of shrapnel such as four-legged shrapnel (4-LEG-H, CHN, FSHN series), round shrapnel (RHN series), and rectangular shrapnel (OHN, ORNN series) onto rigid printed circuit boards (PCBs).

  



3. Using shrapnel with fins (pins) such as triangular shrapnel (TDF-Wxxx, TDF-TOP-Wxxx series), four-legged shrapnel (4-LEG-W, 4-LEG-D-W, 4-LEG-H-W series), and round shrapnel (RDF-W, RNN-W, RNN-W-X3 series), the fins (pins) of the shrapnel can be directly snapped onto the rigid printed circuit boards (PCBs). PCB).

  



4. Use shrapnel such as triangular shrapnel (TDF,TNF-TOP,TDF-TOP-1,RDF,RDF-TOP series) and fix the shrapnel through the plastic case. (As shown above).

Common metal dome is packaged in the following forms:

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1. Bulk Packing: The main packaging form of metal dome.





2. Dome Stickers/Array: Fast assembly, labor saving and efficiency





3. Dome Taping : For SMD automatic loading and placement

Industry applications

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Widely used in cell phones, digital cameras, phones, MP3 and other digital products, etc. Metal shrapnel (pot piece) is ubiquitous in life, such as your cell phone buttons, cooking induction cooker buttons, all kinds of household appliances, a variety of fitness electronic equipment, all kinds of electrical appliances, electronic equipment, instruments and instruments, etc.. Various industry applications are only listed for common uses as follows.

1. Various types of remote controls: such as access control code locks, electronic cryptographs, ATM machines, data collectors, metal keyboards, safes, cell phones, electronic scales, POS machines, etc.
2. All kinds of keyboards: such as TV remote control, air conditioner remote control, industrial equipment remote control, car remote control key, etc.
3. All kinds of electrical appliances, electronic toys, fitness electronic equipment: such as treadmills, rice cookers, microwave ovens, washing machines, induction cookers, VCD/DVD, TV sets, MP3, recorders, electronic watches, Bluetooth speakers, etc.
4. All kinds of electronic equipment, meters, instruments, medical equipment and meters: such as electronic pressure meter, electronic blood pressure meter, electronic blood glucose meter, etc.

Product specifications

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Document download：

Product specifications