Bolt Material based on Bolt head markings.

[GeoffKZ]

I have a pump motor connected to the base using 3/4" diameter bolts which have markings on the bolt head
MULTI-C
A-8
I have determined that Multi-c stands for the word "MULTI" followed by capital "C" to be applied to all ASME bolts manufactured to Nuclear Standards Associates or Cardinal Industrial Products, Inc. Standards.

"A-8" most likely identifies material grade.
Is it Grade 8 bolt?
does anyone have Nuclear Standards Associates or Cardinal Industrial Products, Inc. Standards.
These companies were active in 1960s, therefore it is difficult to find any PDFs with their standards or specifications.
I have uploaded page from publication which identified what MULTI-C means.
I am looking for material grade for markings "A-8"

 

[dhengr]

GeoffKZ:
I’ve seen some charts of these markings before, but I don’t remember exactly where. Google “bolt head markings,” and see what you can find. Call a couple bolt manufacturers or bolt suppliers, use the phone, not an e-mail which likely get answered by an e-monkey, and actually talk with an engineer or someone who knows what they are talking about, not the phone answering machine/person.

 

[GeoffKZ]

Thank you very much for your reply. I was thinking the same, phone call to bolt manufacturer and maybe an engineer almost ready to retire will have the answer.
Thank you again.

 

[Agent666]

Isn't A8 a grade 304 stainless steel designation, ASTM A194 grade 8A turned up from a quick Google for grade 8A fasteners, so check that out to see if it contains what you are after.

 

[Ron]

If it is a Grade 8 bolt, it will have 6 radial lines. Grade 5 bolts have 3 radial lines.

 

[dik]

FYI... see page 18

Dik