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Gold fingers are the gold-plated columns along the connecting edges of printed circuit boards (PCBs), please see the following picture for reference. Gold fingers are served as the connecting contacts between motherboards and components like graphics or sound cards. PCB gold fingers are also used in various other devices that communicate via digital signals, such as smartphones and smartwatches. Gold is used for the connecting point along a PCB because of the alloy's superior conductivity.
1. Basically, only when ENIG is chosen, the fingers for your PCB will be with gold, if you choose HASL surface treatment, then it will be covered with tin.
2. Chamfers are not available on boards smaller than 5x5cm.
3. If there is fingers in your file and it is panel with v-cut, then the fingers can not be made with chamfer since the fingers will be in the middle of the PCB.
4. For the finger required to be 45° beveled, enough space shall be left between the finger to the board edge to prevent a cut of the traces. Please refer to the safety margin indications as following for different board thicknesses: