A 12mm momentary high round metal push button is a compact, spring-loaded switch that activates a circuit only while pressed and turns off immediately when released. Housed in a durable stainless steel or aluminum shell, it requires a 12mm mounting hole and is widely used for horns, PC power switches, and custom control panels.

Action Type: Momentary (Push-to-ON, Release-to-OFF)
Mounting Hole Size: 12mm (approx. 0.5 inches)
Head Shape: High round cap for easy touch operation
Material: Stainless steel, brass nickel-plated, or aluminum alloy
Contact Configuration: Typically SPST Normally Open (1NO)
Electrical Rating: Usually 2A to 3A at 12V/24V DC or up to 250V AC (varies by model)
Protection Level: Often IP65 or IP66 waterproof and dustproof
Lifespan: ~1,000,000 mechanical cycles / 100,000 to 200,000 electrical cycles

Automotive and motorcycle horn or ignition upgrades
Computer PC power or reset switches
DIY electronics and micro-controller projects
Industrial control panels, marine equipment, and custom doorbells