Dialectical Data
~/workshop $ cat ./inventory/egstarts-24mm-arcade-button/README.md

EG STARTS 24mm Arcade Push Button (10pcs)

category
Bench stock
qty
10
status
owned / untested
maker
EG STARTS
EG STARTS 24mm Arcade Push Button (10pcs)

Overview

A classic arcade-cabinet push button with a built-in micro switch, 24mm mounting hole — the standard “MAME cabinet” button size, hole-compatible with Sanwa OBSF-24/OBSC-24/OBSN-24 series buttons. Larger and more tactile than the 16mm buttons also in this library ([[ecbuying-16mm-push-button]]); the go-to part for building a game-controller or arcade-style panel.

Key specs

  • Mounting hole diameter: 24mm (Sanwa OBSF-24-compatible)
  • Switch: built-in micro switch, momentary
  • Rated life: micro switch typically rated for millions of actuations in this button class (EG STARTS’ illuminated variants cite 5 million; this non-illuminated listing doesn’t independently confirm the figure — treat as typical for the class, not verified for this exact SKU)
  • Colors: per this specific listing’s photo, black; EG STARTS sells the same 24mm button in red/yellow/blue/green/white/black variants generally

Pinout

2-pin (sometimes 2 redundant pairs) momentary micro switch inside the button housing — connects its terminals only while pressed. No polarity.

Wiring / typical usage

Mount through a 24mm panel hole (standard MAME/arcade cabinet cutout), secure with the included clip/nut. Wire the micro switch’s two terminals the same as any momentary switch — one to a GPIO (pull-up/pull-down), one to GND or the logic rail. Designed for panel-front, enclosure-mounted use rather than breadboard/PCB work.

Code / libraries

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

Source material

  • Purchase link: Amazon, “EG STARTS 10x 24mm Arcade Push Buttons Switch for Video Games Arcade Machine DIY Parts Mame Jamma Raspberry Pi KOF Arcade Pinball Machine Parts & Accessories” (ASIN B01LWQ9YN5)
  • Product photo: /inventory/egstarts-24mm-arcade-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 (24mm) and Sanwa OBSF-24 hole compatibility read directly from the Amazon listing title/description — high confidence, this is a standard, widely-documented arcade button size. Exact switch life-cycle rating and current/voltage limits are inferred from the general 24mm arcade-button class (per other EG STARTS listings), not independently confirmed for this specific non-illuminated SKU.

Notes / gotchas

  • EG STARTS sells visually similar buttons in 24mm, 30mm, and 33mm, plain and LED-illuminated — double-check the listing’s exact ASIN/size before assuming a replacement part is interchangeable.
  • No photo sourced yet — flag for a manual product photo next time these are handled.