No registration or passwords; no pop-up ads -- just aloha, fun, & answers.
(as an eBay Partner & Amazon Affiliate earns from qualifying purchases).
Home /
Site 🔍
pub  Where the
world gathers for metal finishing
Q&As since 1989


How much cadmium in a cadmium bolt?

We have a load of hazardous dust that is 2.2 ppm of cadmium. The box weighs 13 tons. I figure that it contains about .06 lbs of cadmium in it. My question is, how many bolts would I have to melt to give me the 2.2 ppm of cadmium. How much cadmium is in a cadmium coated bolt?

matt cox
- waterloo, Iowa, USA

First of two simultaneous responses --

Not enough information to calculate, but here's how to estimate: First, select a typical bolt size and thread type. Use a Machinery's Handbook and figure out the total surface area of the bolt. The bolt was perhaps plated per Federal specification, AMSQQP416, Class 2, Type 2 (0.0003" Cd + yellow chromate). The density of Cd is 0.313 lbs/cu. inch. Hence, 0.06 lbs is enough for 639 sq. inches of plating. Divide by the bolt area and voilà tout, the number of bolts.

Your dust also has some Cr, but likely at a lower concentration than Cd.

Ken Vlach [deceased]
- Goleta, California

contributor of the year honored Ken for his countless carefully researched responses. He passed away May 14, 2015.
Rest in peace, Ken. Thank you for your hard work which the finishing world, and we at, continue to benefit from.


Second of two simultaneous responses --

Matt, figure on the cadmium plating averaging 0.0003 to 0.0005 inch thick. You know the size of bolt you're talking about, so your rough calculations should be reasonably accurate.

Good luck!

lee gearhart
Lee Gearhart
metallurgist - E. Aurora, New York

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully 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 might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

Chemicals &
Consult'g, Train'g
& Software

About/Contact  -  Privacy Policy  -  ©1995-2024, Pine Beach, New Jersey, USA  -  about "affil links"