-- The Home Page of the Finishing Industry

on this site
current topics

60,000 Q&A topics -- Education, Aloha, & Fun

topic 17490

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.


Dan St. John
- Tualatin, Oregon

First of two simultaneous responses2002

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.
Milt Stevenson, Jr.
Anoplate Corporation
supporting advertiser 
Syracuse, New York
Anoplate banner

Second of two simultaneous responses2002

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


none spacer

Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start NEW Thread

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental Compliance

©1995-2020, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.