ASSURE PROPER MANUFACTURING OF YOUR PRINTED CIRCUIT BOARDS

Keshijia provides you below with the required in-house tolerance guidelines to ensure quality manufacturing of your printed circuit boards. Adhering to these tolerances will allow for proper manufacturing of your PCBs. Within these parameters, there is enough variation to allow us to manufacture the board and then also for it to work properly in your application. If you have any questions or want to discuss unique requirements, please call +86 755-82593860 to contact us.

Inner Layer Clearances

We require a minimum of 0.010" inner layer clearance.

Copper to Edge of Printed Circuit Board

Minimum of 0.010" (outer layers) and 0.015" for inner layers (0.020" preferred for inner layers). For scoring, minimum of .015 for outer layers and .020 for inner layers.

Pad Size/Annular Ring

Pad size should be at least + 0.010" over finished hole size for vias and + 0.014" over finished hole size for component holes. This means the annular ring (radius of the pad) should be at least .005" for vias and a minimum of 0.007" for component holes.

Hole Size

+/- 0.005" Standard Spec (applies to holes up to .250", larger holes will be routed, see Rout tolerances below)

+/- 0.005" Custom Spec

+/- 0.003" Custom Spec upon request 1 oz and 2 oz finished copper weight and 3 oz finished copper weight (when starting with 2 oz foil) only.

If your hole tolerances are zero (see below), then Advanced Circuits will assume that you are OK with our default hole tolerance. Our default hole tolerance is listed above.

Example: Customer Drill Chart with Zero Hole Tolerance