Fastener strength
Fastener strength
(OP)
What is the strength for a hex bolt fastener with markings A,F,X and O in the center. It is in an aircraft hangar so it may be an aircraft bolt.
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RE: Fastener strength
RE: Fastener strength
http://assist.daps.dla.mil/docimages/0001/59/31/1291A.PD3 With a quick glance, I don't see the symbol you described, but perhaps a closer inspection will find it.
Appear to be an AN (AN 3-20)standard steel type with manufactures marking
For a good marking pics see:
http://www.vikingbolt.com/sub_pages/specifications/spec_pages/ident_markings/index.htm