If you're installing a 30mm push button switch, the correct hole size is simple:
👉 You need a 30mm diameter mounting hole.
That's the standard size for most industrial push button switch models labelled as "30mm."
Why a 30mm Hole Matters
A 30mm push button switch is designed to fit snugly into a 30mm panel cut-out.
Too small → the switch won't fit
Too large → the switch may wobble or fail to secure properly
Most switches include a mounting nut or clip that locks the unit firmly in place from the back of the panel.
Quick Installation Guide
Here's how to get it right the first time:
1. Mark the Panel
Measure carefully and mark the centre point.
2. Drill the Hole
Use a 30mm hole saw or step drill bit for best results.
3. Clean the Edges
Remove burrs to ensure a smooth fit.
4. Install the Switch
Insert the push button switch, then tighten the mounting nut from behind.
Common Mistakes to Avoid
Using a 29mm drill bit (too tight)
Over-drilling beyond 30.5mm (loose fit risk)
Ignoring panel thickness limits (important for secure mounting)
Panel Thickness Considerations
Most 30mm push button switch models support panel thicknesses like:
Standard: 1–5mm
Heavy-duty models: up to 10mm or more
Always check the product specs before drilling.
Are All 30mm Push Buttons Exactly 30mm?
Not always.
While the mounting hole is 30mm, the actual switch body may vary slightly depending on:
Manufacturer design
Waterproof structure (IP65 / IP67)
Metal vs plastic housing
👉 Tip: Allow a small tolerance (±0.2mm) if you're working with metal panels.
Related Sizes (For Comparison)
Understanding other common sizes helps avoid confusion:
16mm push button → 16mm hole
19mm push button → 19mm hole
22mm push button → 22mm hole
30mm push button → 30mm hole
Choosing the Right Push Button Switch
Beyond hole size, buyers often care about:
Waterproof rating (IP65 / IP67 / IP68)
Illumination (LED or non-illuminated)
Contact type (NO / NC / DPDT)
Voltage compatibility
Material (stainless steel for durability)
If your application involves harsh environments, a sealed push button switch is essential.
A Quick Note on ONPOW
If you're sourcing reliable industrial switches, ONPOW push button switch solutions are designed for demanding applications. With options like:
Long mechanical life
Custom LED colours and voltages
High protection ratings (up to IP67/IP68)
They're widely used in automation, control panels, and outdoor equipment-especially where durability matters.
Final Answer
Standard hole size for a 30mm push button = 30mm
Use proper tools and allow minimal tolerance
Always check panel thickness and switch specifications
If you're planning a project, getting this small detail right can save time, prevent rework, and ensure your push button switch performs exactly as expected.