# Board outline tolerances
**URL:** https://sierraconnect.protoexpress.com/t/board-outline-tolerances/783
**Category:** Schematic and layout
**Created:** [January 2, 2024, 8:38pm UTC](https://sierraconnect.protoexpress.com/t/board-outline-tolerances/783 "2024-01-02T20:38:57Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@au5t1nuofa](https://sierraconnect.protoexpress.com/u/au5t1nuofa)
#### Post date: [January 2, 2024, 8:38pm UTC](https://sierraconnect.protoexpress.com/t/board-outline-tolerances/783/1 "2024-01-02T20:38:57Z")
What are some standard tolerances for board outlines, I think 10 mils is standard is that true? I believe this is routed out what are some tighter tolerances that you can get? Can you laser out the board for a tighter tolerance? Also, does this depend on stackup, number of layers and/or board thickness?
Thanks,
Austin S
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### Author:  [@steve.carney](https://sierraconnect.protoexpress.com/u/steve.carney)
#### Post date: [January 2, 2024, 11:33pm UTC](https://sierraconnect.protoexpress.com/t/board-outline-tolerances/783/2 "2024-01-02T23:33:33Z")
Hi Austin.
Our callout for mechanical routing is +/- .005” for standard product and +/- .003” for advanced and micro. We can hold +/- .002” for special applications but this takes special tools and set-up so more cost. Also need to see the job before committing to this. Controlling router bit deflection is a big issue in holding tolerance so board thickness and layer count can dictate what diameter router bits are required. Laser routing has a much tighter tolerance at +/- .0005” but it’s best for the board thickness not to exceed .032” due to the focal length of the laser beam. Let me know if you have any questions.