Thread: Self-tapping screw with flute and type B (blunt) tip
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Old 02-13-2019, 09:51 AM
TMAllison TMAllison is offline
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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.
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Terry Allison
N. Calif. & Boca Chica, Panama

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