This PCB Hole Works without Solder | Press-fit Holes Explained
WHAT THIS VIDEO COVERS
This video explains PCB press-fit holes — a solderless interconnection technology where compliant pins from connectors are mechanically forced into plated through-holes to establish reliable electrical contact.
Instead of soldering, the compliant pin compresses during insertion and then expands against the copper barrel, creating a gas-tight, high-reliability connection. Success depends heavily on hole quality: precise finished hole size, thicker copper plating, larger annular rings, and tighter tolerances compared to standard vias.
Key design considerations include avoiding placement too close to the board edge, as the PCB itself becomes part of the connector system. Improper sizing can lead to insufficient contact force (if oversized) or cracked barrels and damaged inner layers (if undersized).
These techniques are particularly valuable in high-reliability PCB assembly and applications such as automotive PCB, aerospace PCB, and industrial control PCB. The video provides practical guidelines to improve connection reliability during PCB prototype and production.
KEY HIGHLIGHTS
- Press-fit holes create solder-free connections by mechanically compressing compliant pins against the plated copper barrel.
- Require thicker copper, larger annular rings, and tighter tolerances than standard plated through-holes for reliable performance.
- Critical layout rule: keep press-fit holes away from PCB edges to prevent mechanical stress and damage.
FAQ
Q1: What are the main advantages of press-fit holes over soldered connections?
A1: Press-fit holes provide solder-free, high-reliability mechanical connections with excellent contact force, ideal for high-vibration or high-current applications without thermal stress from soldering.
Q2: What hole specifications are critical for successful press-fit connectors?
A2: Press-fit holes need thicker copper plating, precise finished diameter, larger annular rings, and tighter tolerances to ensure proper insertion force and long-term contact reliability.
Q3: Why should press-fit holes not be placed near PCB edges?
A3: Placing press-fit holes too close to the edge risks board cracking or delamination under the high mechanical forces during pin insertion, as the PCB acts as part of the connector system.
What if one PCB hole had to replace solder completely? That's exactly what a press-fit hole does. Instead of using solder, a press-fit connector forces a compliant pin into a plated hole. The pin compresses during insertion, then pushes outward against the copper barrel to maintain electrical contact. Sounds simple. But the entire connection depends on the hole quality. If the finished hole is oversized, the contact force drops. If it's undersized, the insertion force can crack the barrel or damage inner layers. That's why press-fit holes usually require: thicker hole copper, larger annular rings, and tighter tolerances than normal vias. One critical rule: never place press-fit holes too close to the PCB edge. Because in press-fit design, the PCB is part of the connector.
