Metallics MNK212 Nail 2-1/2 Flute Mas Nail &Fender W

The MNK212 is a 2-1/2 inch fluted masonry nail supplied with a fender washer, used to fasten into concrete, block, and brick. The fluted shank bites into masonry as it is driven, and the washer spreads the clamping load so thin material such as strap, conduit clamp tabs, or sheet goods is held down without the head pulling through.

Yes, the fender washer is part of the MNK212 as supplied, so there is no separate washer to order. That matters on electrical work where the washer is what holds a strap or thin bracket tight against block.

Overall length is 2-1/2 inches. The portion that penetrates the masonry is that length minus whatever you are fastening through plus the washer thickness, so fastening a thin strap leaves most of the 2-1/2 inches in the substrate. If you are mounting thicker material and need more bite, step up to a longer masonry nail rather than relying on this one.

A fluted masonry nail like the MNK212 is driven, not drilled and set, so it installs faster for light attachment such as conduit straps, boxes, and furring on concrete or block. For loads that need a rated pullout value, or for installation into hollow block webs where a driven nail can crack the face shell, use a screw anchor or expansion anchor instead.