Bolt Head Identification Markings 1

[dougember]

Does anyone recognize the following bolt head identification:

A large central "F" surrounded by 12 equally spaced radial dashes?

Regards,

Doug E.

 

[jheidt2543]

I don't recognize it off hand. However, when I had a similar question, I found the answer by contacting my local Fastenal distributor. Their catalog listed several head markings and luckily one of them was one I was looking for.

The other option would be to contact you local steel fabricator, they may know.

 

[unclesyd]

It's not listed in my list of reqistered logos as Feb 2003.
What type bolt is it and what's intended use as the only "F" head, without the radials, was for a car restoration parts supplier.

There have been several manufacturers that poduced a fastener that was called various by names, "super 8, super alloy, grade 9, and others" but carried a tensil strentgth of around 175,000 psi. They all carried fancy head markings, more than the 8's 6 lines.

 

[boo1]

The "F" appear to be, the markings are manufacture identifiers.
NIST is responsible for registering all bolt head markings since the Fastener Law took effect. For a free pdf copy of their most current list, you may go to

http://www.uspto.gov/web/offices/tac/fqa/fqa.htm.

Anouther site for fastener marking:

http://www.americanfastener.com/technical/grade_markings_steel.asp

Check, MIL-STD-1291A
Title: IDENTIFICATION SYMBOLS FOR AEROSPACE FASTENER MANUFACTURERS at:

http://assist.daps.dla.mil/docimages/0001/59/31/1291A.PD3

you can check MIL-HDBK-57

 

[Kenneth]

... which you'll find at

http://assist.daps.dla.mil/docimages/0001/49/36/HDBK57B.PD2