I have seen wide varieties at previous companies, from too few to too many with boilerplate, old revisions of standards, etc. Can you suggest a middle of the road list? This is for regular PCB fabrication for production.
- client's name,
- (project ID),
- unique PCB ID
- CTI (Comparative Tracking Index),
- number of layers,
- layer stacking: reference to Gerber filename for each layer,
- copper thickness,
- solder mask color,
- silkscreen color
- Tooling for PCB edges: V-cut or milling,
- PCB outline drawing with tolerances. This may be as simple as a rectangle, but this board's outline consists of 52 line segments
- If there's room for it some shops like to add a quality logo (like UL) and/or a production date to the silkscreen. Tell them which area of the PCB they can use for this.
To what's already been mentioned, I'd add
- Surface finish (HASL, gold-plated, or ...)
- Lead free requirements or lack thereof
- Serialization requirements
- Allowed deviations from the design files (i.e., remove silkscreen from areas not covered by solder mask, etc.)
- color of solder mask
- Any specifications for controlled impedance (i.e. "tracks drawn as 4.05 mil wide on top layer shall be 50 Ohm controlled impedance +/- 10%")
- Tolerances for board dimensions, drill registration, drill diameter.
- Fire safety rating (e.g. 94V-0), if required.