PCB Mounting Holes Explained: Video Guide for Engineers
What This Video Covers
This video explains the purpose and design of mounting holes in PCBs. These features secure the board inside enclosures and directly impact mechanical reliability, thermal performance, and electromagnetic compatibility.
The script distinguishes between plated through holes, which can tie into the ground plane for EMI shielding, and non-plated holes used purely for mechanical support. It also covers the surrounding vias that strengthen the mounting area, improve heat dissipation, and ensure consistent electrical connection to the ground plane.
Practical design recommendations include adding copper keep-out zones when mechanical support is the only requirement, verifying edge clearance, and applying proper manufacturing tolerances. These insights help engineers avoid common failures in demanding environments such as automotive electronics and industrial control systems.
The content is directly relevant for teams working on rigid-flex PCB or high-frequency PCB projects where both mechanical integrity and signal performance must be maintained.
Key Highlights
- Plated mounting holes enable ground connection and EMI shielding, while non-plated holes provide pure mechanical support.
- Surrounding vias reinforce the board, distribute heat evenly, and maintain reliable ground-plane continuity.
- Always apply copper keep-out zones and verify edge clearance plus tolerance for long-term reliability in automotive and industrial applications.
FAQ
Q1: When should I choose plated mounting holes instead of non-plated ones?
A1: Plated mounting holes are preferred when electrical connectivity to ground planes or shielding is required, or when the hole will carry current or provide a reliable solder joint for mechanical components.
Q2: How do vias around mounting holes affect thermal management and signal integrity?
A2: Vias placed around mounting holes can create additional thermal paths to inner copper layers and strengthen ground connections, reducing hot spots and minimizing EMI coupling from mechanical stress points.
Q3: What clearance and tolerance rules apply to PCB mounting holes in high-reliability designs?
A3: High-reliability applications such as aerospace and medical devices typically require minimum 0.5 mm annular ring clearance, IPC Class 3 tolerances on hole diameter, and controlled plating thickness to ensure long-term mechanical and electrical reliability.
Ever spotted a big hole on a PCB — surrounded by a bunch of tiny ones?
They're not just decoration — they actually serve a purpose.
Let's talk mounting holes —they're what keep your PCB firmly in place inside a case.
Think of them like the screws and anchors that hold everything together.
There are two main types:
Plated through holes, which can connect to ground,and non-plated holes, purely for mechanical support.
So, which one should you choose?
Well, it depends — is your case metal
Do you need grounding or EMI shielding?
Now, what about those tiny holes around the big one?
They're vias — they reinforce the board,help heat spread more evenly,and connect the mounting ring to the ground plane.
A few quick design tips:
If the hole is only for support, add a copper keep-out zone.
And always check your edge clearance and tolerance.
Hope this helps! What PCB topic should we cover next? Comment below — and follow for more PCB tips!
