Allowed Drill Sizes for the Two Layer Special
AP Circuits is capable of drilling any number of drill sizes down to 0.013" finished.
However, we can keep our costs down by providing a pre-selected set of drill sizes.
Costs we save are then passed on to our customers.
| Finished Size |
Approximate Use |
| .017" |
via holes |
| .025" |
via holes, fine lead devices such as trim pots etc. |
| .032" |
IC's, 1/4 watt resistors, small diodes, ripple caps etc. |
| .035" |
Square posted pins that measure .025" on the flat. |
| .039" |
TO-220 packages, IDC type square posted headers, 1/2 watt
resistors, 1N9000 series diodes, IC chip carriers etc. |
| .049" |
larger connectors, transformer leads, etc. |
| .057" |
similar to .049" above |
| .083" |
TO-220 mounting holes, screw holes, general mounting |
| .122" |
mounting holes |
| .149" |
mounting holes |
|