Why the 22mm diameter metal push button switch is most common model?

The most mainstream and universal metal button size in industry, equipment and cabinets is: 22mm mounting hole diameter; according to the usage frequence to rank the common size, the 22mm diameter is most common type, 19mm and 16mm, as well as 25mm and 30mm, there is also more bigger size of 40mm; these big metal push button switch is too big so it's mostly used for emergency and power switch.

Why the 22mm diameter metal push button switch is most common model? 

1. Unified Industry Standard with Excellent Versatility

Nearly all control cabinets, distribution boxes, and switch panels are designed with a 22mm mounting hole.

Accessories, fixing nuts, and waterproof gaskets are fully universal and require no customization.

Full interchangeability between brands (Schneider, Siemens, and domestic metal pushbuttons).

2. Best Tactile Feel and Operating Experience

Moderate button head diameter for comfortable finger operation – neither too small nor bulky.

Actuation force is well‑balanced, preventing accidental actuation while remaining easy to press.

3. Ample Internal Space and Strong Functional Expandability

Easily accommodates:

• NO/NC contacts (1NO1NC, 2NO2NC)

• LED bulbs (ring lights, power indicator lights)

• Latching / momentary mechanisms

Small‑sized buttons (16mm / 19mm) often cannot fit double contacts or high‑brightness LEDs.

4. Improved Strength and Waterproof Performance

Adequate wall thickness and sturdy metal housing.

Large sealing rings ensure reliable sealing, commonly reaching IP65 / IP67.

5. Lowest Procurement Cost and Fastest Lead Time

Highest production volume with stable pricing.

Widely available from stock, making repair and replacement extremely convenient.

Clear Advantages Compared with Other Sizes

1. Compared with 16mm Small metal push Buttons

Advantages of 16mm: Compact, space‑saving, suitable for dense panels.

Advantages of 22mm:

• More comfortable to press, less prone to accidental operation

• Supports lighting and multi‑contact configurations

• More durable with better waterproof performance

2. Compared with 19mm Metal push Buttons

19mm sits between compact and standard sizes.

Advantages of 22mm metal push button switch:

• Standard component with far greater versatility than 19mm

• More mature mechanism and longer service life

• Standard panel cutout, no custom machining required

3. Compared with 25mm / 30mm Large metal push Buttons

Large sizes are mainly used for emergency stops and main power switches.

Advantages of 22mm metal push button switch:

• Saves panel space and allows dense arrangement

• Not bulky, with a more balanced appearance

• Lower cost and easier installation

For general control, start/stop functions, and indicator buttons: 22mm metal push button switch is the first choice.

For extremely limited panel space requiring dense layout: choose 16mm / 19mm metal push button switch.

For emergency stops, main power control, and highly visible operation: choose 25mm / 30mm metal push button switch.

For equipment panel design, directly adopting 22mm metal pushbuttons is the most reliable, cost‑effective, and maintenance‑friendly solution.