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
Q: When should I choose plated mounting holes instead of non-plated ones?
A: 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.
Q: How do vias around mounting holes affect thermal management and signal integrity?
A: 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.
Q: What clearance and tolerance rules apply to PCB mounting holes in high-reliability designs?
A: 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 noticed a large mounting hole surrounded by tiny vias?
They’re not just mechanical features — they affect grounding, EMI performance, and heat spreading.
What you’ll learn in this video:
• Plated vs non-plated mounting holes
• When grounding matters (metal cases, EMI, shielding)
• Why tiny stitching vias surround the mounting pad
• Key design tips: copper keep-out, edge clearance, tolerance
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