I've run across this type of screw now and then, a machine screw, usually short - 1/2 inch or less - and stout, that is diameter maybe 1/3 to 1/2 its length. The one pictured here is much longer than that but it's a good photo of the item and there aren't many to be had right off.

I need several - 5/16" long, maybe 1/8 to 3/16 dia. Metric would be about 8mm long by 3 to 5mm.

Anyone seen these on a retail shelf anywhere?

__________________
1986 300SDL, 362K
1984 300D, 138K

No...it looks like business though!

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

You will probably find it, and everything else at Fastenal.

IIRC Ace Hardware will have them.

__________________
Jim

With a self taping spade on the shaft you are describing a Tek Head. Used for metal stud construction commercially.

I pick the up in the E320's tires visiting job sites.

Your photo with the spiral groove on the shaft looks like a concrete screw? Here in S.A they are always blue.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

This is a good site: https://www.boltdepot.com/

Seems that by keeping the cutting feature all the along the shaft as opposed to just at the beginning is asking for stripping if you don't lay off at just the right time.