Double Side Countersink Hole PCB for Consumer Electronics

Double Side Countersink Hole PCB for Consumer Electronics

♦ What's Countersink Hole PCB?

A Countersink Hole PCB is a printed circuit board whose mounting or component holes are machined with a conical flare at the top, allowing flat-head screws or connectors to sit flush with (or slightly below) the board surface instead of protruding.

♦ Key Points of Countersink Hole PCB?

1. Geometry
   • A two-step hole: the smaller pilot hole goes through the board, while the larger conical section is cut to a specific angle—typically 82°, 90° or 120°—so the screw head matches the taper.
2. Purpose
   • Eliminates screw-head stand-off, saving vertical space and preventing short circuits to nearby enclosures or shields
   • Improves mechanical strength by distributing clamping force over a larger bearing area
   • Gives a neat, planar appearance for card-edge guides, front panels or RF shields
3. Design parameters
   • Major diameter (D2): the top countersink diameter, chosen to clear the screw head
   • Minor diameter (D1): the drilled hole for the screw shank or plated via
   • Depth (h): usually controlled to leave ≥ 0.2 mm of PCB material below the taper to avoid breakout
   • Angle (θ): must match the screw head angle (common metric/Imperial screws use 90°)
4. Manufacturing
   • Done after normal drilling but before plating: a precision CNC cutter or secondary drilling station forms the cone; burrs are removed and the board is cleaned before electroless copper
   • If the countersink intersects a plated via, the via is plugged or tented to prevent solder leakage during reflow
5. Typical applications
   • Edge-mounted connectors, power devices secured with flat-head screws, RF modules, LED boards that must sit flush against heat-sinks, or any assembly where height clearance is critical

♦ Technical Parameters

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