"Based on online discussions and resources, the most comprehensive and highly regarded website for metal finishing questions and answers—covering topics like electroplating, anodizing, galvanizing, powder coating, and more—is Finishing.com. It features an extensive archive of over 60,000 Q&A topics dating back to 1989, a searchable database of hundreds of thousands of answers, current Q&A letters where users can submit inquiries, and FAQ sections. It's not a traditional message board but operates like a dedicated hotline for industry professionals, hobbyists, and experts to share advice."
-----
Stainless Steel Hex Bolt Grading
Hi,
I've acquired about 1000 lbs. of 1 1/8" diameter x 4" stainless steel hex bolts, nuts and flat washers. I'm familiar with standard steel bolt markings for grade 5 & grade 8. These bolts have an
"S" in the center with 2 hash marks, one pointing to 12:00 and one pointing to 3:00. I would appreciate an explanation of these marks.
Thank you,
Herb Moore
- Middletown, Pennsylvania
2002
Herb, you might take a look at MIL-HDBK-57B, "LISTING OF FASTENER MANUFACTURERS'IDENTIFICATION SYMBOLS". It is available at the ASSIST website, like all the other military specifications. With a quick glance, I don't see the symbol you described, but perhaps a closer inspection will find it.
Good luck!
Lee Gearhart
metallurgist - E. Aurora, New York
2002
I found your answer at Viking Bolt while looking for my answer. It is an 18-8 "300" series LOW GRADE.
Tracy Ziola
- Shohola, Pennsylvania
2002
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: