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Metal finishing Q&As since 1989
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Self tapping screws through hard anodize
I would like to find out if it is possible or practical to hard anodize a piece of 3/16 6061 aluminum and then use a self tapping or thread cutting screw to create a ground? Will I be able to make enough contact on a 4-40 screw assuming the anodize will be 1.5-2 mils. I need to be able run at least 25 amps on a default mode through the ground. Has anyone had any experience doing this? I could use some help.
Thanks,
- Tualatin, Oregon
2002
First of two simultaneous responses
My suggestion would be to drill a hole but don't tap it. Have the anodizer plug the hole (cheap) and then use your self-tapping screw to establish the ground. Tapping into aluminum oxide is tough, will be hard to align straight and likely to give inconsistent results.
![milt stevenson jr.](../portraits/milt_stevenson.jpg)
Milt Stevenson, Jr.
Syracuse, New York
2002
Second of two simultaneous responses
A 6x32 might make it, but I would expect grief with a 4x40. A thought, why not use a silicon pull plug to mask the hole. Easy in, easy out. Tygon tubing can also be used with a little more difficulty but a lot less material cost. The silicon plugs are reusable for several times. Several vendors at this site.
James Watts- Navarre, Florida
2002
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