Buzzers and beepers: 12 mm, 15 mm magnetic; TDK PS1240 piezo — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/buzzers-tht/  (CC BY 4.0)
Basis: KiCad 3D models of common PCB buzzers (12 × 9.5 mm and 15 × 7.5 mm magnetic with 7.6 mm pin spacing; TDK PS1240 12 mm piezo; CUI CST-931)
Catalog version: 2026-10-20

Sizes: see table below
- 12 mm magnetic buzzer (the black cylinder on Arduino kits): Ø12 × 9.5 mm, pins 7.6 mm apart, sound hole on top; needs a Ø3–4 mm hole in the case within 2 mm of the port.
- 15 mm: Ø15 × 7.5 mm, same 7.6 mm pitch. TDK PS1240 piezo: Ø12.2 × 6.5 mm, 5 mm pitch; passive, drive with a square wave.
- A printed resonant chamber (Ø12 cavity 3 mm deep over the port, exiting through a Ø2.5 hole) makes a 12 mm buzzer noticeably louder.

part  bbox_l_mm  bbox_w_mm  bbox_h_mm
12x9.5rm7.6  12.5  12.0  12.0
15x7.5rm7.6  15.0  15.0  10.5
mallory-ast1109mltrq  15.0  9.0  2.0
tdk-ps1240p02bt  21.5  12.0  12.0
cui-cst-931rp-a  10.8  9.0  9.0
kingstate-kcg0601  6.8  6.6  6.6
prosignal-abt-410-rc  12.0  12.0  11.5

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- KiCad: kicad-packages3D library (origin of these files) — STEP, WRL — CC BY-SA 4.0 with KiCad exception — https://gitlab.com/kicad/libraries/kicad-packages3D

Free files (CC BY-SA 4.0 (KiCad library license, with the KiCad exception), KiCad library contributors; STEP + STL, 7 parts): https://xemstudio.com/files/kicad/buzzers-tht/index.json
API: https://xemstudio.com/api/geometry?object=buzzers-tht