Stainless 1/4-28 Screw + countersunk washer ID
Pulled these out of my 1968 Lotus. Definitely not original. They are both very nicely made, stainless, slightly magnetic. Can't find any grading info on what two radial lines could mean. The previous owner was an aircraft mechanic and the car is peppered with various aerospace and Mil Std hardware.
I'd like to know what to look for so I can order some more. Two radial lines.
Edit: Looking through the MIL-HDBK-131A Spec, item 115 the two lines indicate 80,000 PSI screws in the .250 - 1.000 " range. This particular screw is a MS35308
Washer is dimensionally identical to a MS14183C4. Inconel washers would be a hilarious choice... perhaps they were in service on an aero engine and due to be replaced and the previous owner brought them home for his hardware bin