bolt head marking

[azzt]

Hi

I have a precision steel bolt M10 x 1.25 and it has a raised letter q on the head. I'm fairly sure this is Japanese. Can anyone tell me if this relates to the material strength or is it something else?

Thanks in advance

allan

 

[SwinnyGG]

Just a raised letter Q, or are their other markings? (dots, lines, any other shapes or letters)

 

[EdStainless]

There used to be a database of bolt IDs.
Though I have been searching and haven't found it.
I hope someone with a better memory than mine comes along.

I had thought that it was part of a DoD report on bogus fasteners...

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P.E. Metallurgy, Plymouth Tube

 

[SnTMan]

Ed, I got this from the fora previously, MIL-HDBK-57E. Don't think the OP's maker is listed, but can't say for sure.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[SnTMan]

Here's another, same source

The problem with sloppy work is that the supply FAR EXCEEDS the demand