1 Layer Prototype Service

While we cannot fabricate true single-layer boards, we support single layer designs on our 2 layer fabrication service. The cost, stackup, specs, and turn time are identical to that of the 2 layer service.


Our automated upload service expects all files to contain gerber data for a 2 layer design. This often results in errors when trying to place an order.

In many cases, this issue can be resolved by configuring the design tool to output data for a 2 layer design. If only the manufacturing files are available, this usually requires a few files to be copied and modified. Our Uploading 1 layer boards page has a guide on doing this.


$5 per square inch, which includes three copies of your design. For example, a 2 square inch board would cost $10 and you’d get three copies of your board. You can order as many copies as you want, as long as they’re in multiples of three.

Turn Times

Orders are sent to fabrication daily, and will ship within 10-12 days.

You can get a quote, approve a design, and pay for an order at OSH Park.

For a faster turn time, you may be interested in our Super Swift Service.

Need more than 100 square inches of boards? Our 2 Layer Medium Run Service is a less expensive option for larger orders.

2 Layer PCB Specs

Quick Specs

  • 6 mil (0.1524mm) minimum trace width
  • 6 mil (0.1524mm) minimum trace spacing
  • 10 mil (0.2540mm) minimum drill
  • 20 mil (0.508mm) minimum drill slot
  • 5 mil (0.127mm) annular ring
  • PCB thickness of 1.6mm (.063”)
  • 1oz copper on both sides (1.4mil, 35um)

Detailed Specs

  • ENIG (gold) finish for superior soldering and environmental resistance.
  • Solder resist and silkscreen on both sides.
  • Minimum 15 mil (0.3810mm) keepout distance from traces to the board edge.
  • PCB substrate is FR4 (170 Tg).
  • PCB substrate is compatible with a lead-free process.
  • The boards themselves are also lead free and RoHS compliant.
  • PCB Substrate dielectric constant of 4.6 at 1MHz.
  • Minimum 4 mil (0.1016mm) soldermask web.
  • Maximum soldermask expansion, retraction, or shift is 3mil (0.0762mm).
  • Minimum 68 mil (1.7272mm) width on internal cutouts. See our [Outline][outline] page for detailed information.
  • Manufactured in the United States.
  • Castellations are allowed, but not officially supported.
  • Drill slots are supported from most tools, when used in typical ways. See our Slots page for detailed information.

2 Layer Stackup

Thickness Layer Tolerance
1mil (0.0254mm) solder resist +/-0.2mil (0.00508mm)
1.4 mil (0.0356mm) 1 oz copper  
60 mil (1.5240mm) core +/-6mil (0.1524mm)
1.4 mil (0.0356mm) 1 oz copper  
1mil (0.0254mm) solder resist +/-0.2mil (0.00508mm)

2 layer Drill Specs

Spec Size
Minimum annular ring 5 mil (0.127mm)
Minimum hole size 10mil (0.254mm)
Minimum slot size 20mil (0.508mm)
Maximum plated hole size 250 mil (6.35mm) (See note)
Maximum non-plated hole size 250 mil (6.35mm) (See note)
Drilled hole positional tolerance 2 mil (0.0508mm)
Drilled hole size tolerance +/-2.5 mil (0.0635mm)
Via plating thickness 1mil (0.0254mm)

Note: Holes larger than 250 mil will be milled with larger tolerances. These are fabbed using a 5mil(0.127mm) positional tolerance, and +/-5mil(0.127mm) hole size tolerance.