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410 Stainless Makes these ToughNow there is a self-threading concrete fastener designed specifically for exposed exterior applications. Whether you are mounting a sign, locking down a park bench, installing a hand rail, or just fastening a bottom plate, you won’t need to worry about corrosion. Unlike most grades of stainless, the 410 series is hardenable, making it perfect for these masonry fasteners. Life is full of trade-offs, though, and these screws are not as corrosion resistant as the more common grades of stainless. It isn’t unusual for the screws to have a very light red tint after exterior exposure. Note: 5/16" hex head. This item requires a non-standard 3/16" diameter pilot hole. Made in Taiwan.
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Reviewed by 1 customer
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(4 of 4 customers found this review helpful)
FASTENER IS 9/32" NOT 1/4" AS DESCRIBED
About Me Avid Do-It-Yourselfer
Comments about 1/4'' x 1-1/4'' Hex Stainless Steel Concrete Screws:
This screw is larger in diameter than 1/4". You will need a 17/64ths or 9/32nds hole in the item you are fastening. Also, YOU WILL BREAK THE BIT IF YOU TRY TO USE A STANDARD 3/16" PILOT HOLE IN YOUR CEMENT. When they suggest that oddball 64th's pilot bit, they aren't kidding. Of course, it's not available anywhere easily, so use a 7/32nd cement bit, instead. It worked fine for me after breaking one in a standard 3/16" pilot hole... BTW, it could NOT be extracted using a screw extraction kit. What a waste of time, and broken extraction tool. If you want an accurate description, and a screw that will fit in the hole it claims to fit into, try REAL tapcon. I just wish they would sell less than 100 at a time!
Bottom Line No, I would not recommend this to a friend
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