On Wed, 25 Dec 2013 01:35:33 +0000 (UTC), Red Green
wrote:

Stormin Mormon wrote in news:UNouu.57430$Qi4.9346
:

I've been asked to anchor aluminum threshold
for commercial doors. About six inches wide, and
runs the width of two 36 inch steel doors. One
half of the threshold is loose, and needs maybe
four or so anchors.

Some how, I remember some blue anchors that look
a bit like drywall screws, but have really aggressive
threads. Anyone know what I need for the job?

Where to find these? Lowe's? Need flat head, so as
not to be a trip hazard. Can't have hex heads.



They're Tapcons. Available in flat head like a wood screw or in hex head
like a bolt with an integrated washer. Predrill hole in concrete to a
specified size depending on the diameter of the Tapcon.

http://www.tapcon.com/products.asp
They come in a kit with the required carbaloy bit.