Gold fingers are conductive contacts along a board edge that mate with a connector. Their reliability depends on geometry and mechanical engagement as well as the plated surface. Review the board and mating connector together, using the correct drawing datums and tolerances.
Start from the mating connector
Confirm pitch, pad width, contact length, board thickness and the insertion path from the actual connector drawing. Check key slots and orientation. A nominally matching footprint can still be incompatible if the board thickness or edge location lies outside the mating requirements.
Define bevel and edge geometry
Specify the bevel, residual edge dimensions and its relationship to the contacts where required. Review copper and inner-layer clearance from the processed edge with the fabricator. Include any staggered contact lengths and their electrical sequencing purpose.
Choose the contact finish intentionally
Define the wear and mating requirements and the required plating system. Hard gold and ENIG are different finish approaches; do not substitute one because both appear gold. Identify selective areas and agree the finish acceptance and measurement records.
Validate the assembled interface
Check insertion, retention, seating and electrical connection with the actual mating part. Include enclosure constraints and repeated use where relevant. A dimensional inspection of the bare board alone does not demonstrate the complete product interface.
Release checklist
- Use the exact mating connector drawing.
- Specify board thickness, edge and bevel tolerances.
- Define contact plating and selective areas.
- Verify mechanical fit and electrical engagement.