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+/- 3 mil drill hole tolerance. Stay connected - follow us! Twitter - LinkedIn jnbrown Members Profile Send Private Message Find Members Posts Add to Buddy List Active User Joined: 13 Jan 2020 Status: Offline Points
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a tolerance I figure I should at least add a few mils to the diameter. Also through hole drill usually has a tolerance of +/- 3 mils. So going by IPC recommendation I am figuring
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/b-dimension-in-mounting-hole_topic2765_post11131.html
. For Non-Plated Through-hole the "b" dimension should be larger than the hole size. Probably the hole tolerance +/- 0.05 annular ring. If the hole is non-plated, you want the drill bit to go through FR4 material and not touch any copper to avoid copper slivers in the hole
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applied. Here isan image of the minimum annular ring. There are 2 fabrication tolerances that must be accountedfor. The first and most obvious one is the hole size tolerance that is in thedrill chart on the fabrication drawing
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0.15 mm (6 mils). The big issue is the pad annular ring. The fab shop will add 3 - 4 mils to the finished hole size. Then you must consider drill drift and layer to layer tolerance of 3 mil
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) hole, but the 98 mil (2.5 mm) hole has a 25 mil (0.635 mm) annular ring. PCB Libraries, Inc. position is that large holes require large annular rings for more solder but also to control heat dissipation
