Most of my fasteners are in labeled bags, but I have a few that ended up in the "unknown" bag. These have the "RSC" headmark, no grade lines, looks like a #18 thread pitch (that may not be the correct terminology), the shank is 5/16" diameter, and from the underside of the head to the flat tip of the shank is 3/4".
I have six of them, but they may be part of a larger group, so the quantity may not be significant.
I have six of them, but they may be part of a larger group, so the quantity may not be significant.
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