Metallics MWDS1141M Anchors 1-1/4 Pn Sd Walldog Ancr St-zn (Jar 1000)

The MWDS1141M is a 1-1/4 inch Walldog masonry screw anchor with a pan head and slotted drive, made of zinc plated steel. Walldog style anchors drive directly into a pre-drilled hole in masonry, block, brick or concrete without a separate plastic sleeve or lead shield, which is why electrical crews reach for them when strapping conduit, hanging boxes or fastening straps and clips to a concrete wall.

Yes, that is the usual job for it. At 1-1/4 inches overall, the MWDS1141M gives you roughly an inch of thread into the masonry after the thickness of a strap or clip, which is the normal embedment for light conduit, box and strap mounting. If you are fastening through a thicker standoff, furring or a backing plate, step up to a longer Walldog so you keep enough thread in the base material.

They ship as a jar of 1,000 pieces. That bulk jar is sized for repeat work, a maintenance shop, a service van or a contractor running conduit through a whole building, rather than a one box repair. If you only need a handful, you are still buying the full jar.

These take a flat blade, not a Phillips or hex driver. The MWDS1141M has a slotted pan head, so a straight tip screwdriver or a slotted bit in a drill driver is what sets them. If your crew is set up with Phillips or hex bits only, pick a Walldog anchor with a matching head style instead.

The MWDS1141M is zinc plated steel, which is a light corrosion coating meant for dry interior service. For exterior walls, wet locations or anywhere exposed to chlorides, use a stainless or heavier coated masonry anchor rather than a standard zinc plated one.

No. A Walldog screw anchor cuts its own thread into the drilled hole, so there is no plastic plug, lead shield or expansion sleeve to set first. Drill the hole to the anchor manufacturer's bit size, blow it clean, and drive the anchor. That single step install is the main reason electrical and MRO crews use them over sleeve anchors for light duty attachment.