Bolt Head Identification Markings
Bolt Head Identification Markings
(OP)
Does anyone recognize the following bolt head identification:
A large central "F" surrounded by 12 equally spaced radial dashes?
Regards,
Doug E.
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Bolt Head Identification Markings
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RE: Bolt Head Identification Markings
The other option would be to contact you local steel fabricator, they may know.
RE: Bolt Head Identification Markings
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.
RE: Bolt Head Identification Markings
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_marking...
Check, MIL-STD-1291A
Title: IDENTIFICATION SYMBOLS FOR AEROSPACE FASTENER MANUFACTURERS at:
http://assist.daps.dla.mil/docimages/0001/59/31/1291A.P...
you can check MIL-HDBK-57
RE: Bolt Head Identification Markings