~/workshop $ cat ./inventory/ecbuying-16mm-push-button/README.md

EC Buying 16mm Waterproof Metal Push Button (28pcs, 7 Colors)

category: Bench stock
qty: 28 (4 each of 7 colors: red, green, yellow, white, black, blue, blackish green)
status: owned / untested
maker: EC Buying (reseller/private-label)

Overview

A panel-mount momentary push button with a metal shell, 16mm mounting hole diameter — the “arcade/industrial round button” style, self-resetting (non-locking). Larger and panel-mountable compared to the bare PCB tactile switches elsewhere in this library (e.g. [[gikfun-tact-switch-kit]]); suited for enclosure faces rather than breadboard/PCB use.

Key specs

Mounting hole diameter: 16mm
Type: momentary, self-resetting (normally-open, not a latching switch)
Shell: metal
Colors: Red, Green, Yellow, White, Black, Blue, Blackish Green — 4 of each
Termination: screw terminals (typical for this button class — not independently confirmed for this exact listing)

Pinout

2-pin (or occasionally 2-pair, redundant) momentary switch — connects its two terminals only while pressed. No polarity.

Wiring / typical usage

Mount through a 16mm panel hole, secure with the included nut. Wire one terminal to a GPIO (with pull-up/pull-down) and the other to GND or the logic rail — same debounce considerations as any mechanical switch. Metal-shell buttons like this are commonly used for enclosure-mounted “start,” “reset,” or mode-select controls where a bare PCB tact switch wouldn’t be accessible or durable enough.

Code / libraries

N/A — passive switch, read as a standard debounced digital input.

Source material

Purchase link: Amazon, “EC Buying 28Pcs 16MM Push Button Momentary Push Buttons 7Colors Red Green Yellow White Black Blue Blackish Green 4Pcs for Each Non Lock Self Reset Arcade Switch Button” (ASIN B0D8T65LRG)
Product photo: /inventory/ecbuying-16mm-push-button/product-photo.jpg — cropped directly from Alex’s own Amazon order-history thumbnail for this exact purchase (the listing’s own product image, not a stand-in). Low resolution (thumbnail-sized) since it’s a cropped order-history screenshot rather than a full-size product photo — fine for dashboard identification, worth replacing with a manual photo of the physical units if a higher-res image is ever needed.

Verification

Mounting diameter (16mm), color breakdown, and button type (momentary/self-resetting) read directly from the Amazon listing title — high confidence for what's printed there. Termination style (screw terminals vs. solder lugs) and exact voltage/current rating are inferred from the general "16mm metal arcade-style button" class, not confirmed against this specific listing — check the physical part before wiring into anything carrying real load current.

Notes / gotchas

“16mm” describes the mounting hole, not the overall button cap size — confirm panel cutout clearance before drilling an enclosure.
No photo sourced yet — flag for a manual product photo next time these are handled.