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Old 02-12-2019, 11:38 PM
cmac2012's Avatar
Renaissance Dude
Join Date: Dec 2004
Location: Berkeley, CA
Posts: 24,505
Self-tapping screw with flute and type B (blunt) tip

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, 361K (parked)
1984 300D, 138K
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Old 02-12-2019, 11:53 PM
t walgamuth's Avatar
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 37,064 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.
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Old 02-13-2019, 06:53 AM
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Location: Greater Metropolitan Beaverdam VA
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You will probably find it, and everything else at Fastenal.
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Old 02-13-2019, 06:56 AM
engatwork's Avatar
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Location: Soperton, Ga. USA
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IIRC Ace Hardware will have them.
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Old 02-13-2019, 10:51 AM
Registered User
Join Date: Feb 2004
Location: Walnut Creek, CA & 1,150 miles S of Key West
Posts: 4,874
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.)
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Old 02-13-2019, 11:36 AM
Join Date: Dec 2011
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This is a good site:
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Old 02-13-2019, 01:55 PM
Join Date: Jan 2014
Location: Honah Lee
Posts: 19,323
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.

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