Metallics NA141M Anchors 1/4 x 1 Metal Hammer Drive Nail-In (Box 1000)

Drill a 1/4 inch hole to match the anchor diameter, and drill it deeper than the 1 inch anchor length so the drive pin can seat fully without bottoming out. The NA141M is a 1/4 x 1 hammer drive nail-in anchor, so the hole diameter is the anchor diameter.

No. A hammer drive nail-in anchor needs solid base material to grip, so it works in poured concrete, solid brick, or the solid web of masonry. In drywall or the hollow cell of a block it has nothing to expand against. For hollow walls use a toggle or self-drilling drywall anchor instead.

The nail-in type is a one-shot fastener: drill, push the anchor through the fixture hole, and drive the pin flush with a hammer. It is faster for high-count repetitive work like running conduit straps down a wall. The tradeoff is that it is effectively permanent, there is no clean way to back it out, and it is not reusable. If you need to remove and re-fasten the item later, use a concrete screw or a sleeve anchor instead.

The NA141M ships as a box of 1,000 anchors, which is the single order quantity. That is a bulk count aimed at electrical and MRO work where you are setting dozens of straps or boxes on a run, not a small retail blister pack.

It is an all-metal hammer drive anchor: a metal body with a metal drive pin. There is no nylon or plastic sleeve, so it does not creep or soften the way a plastic anchor can, and it suits the overhead and wall fastening typical of electrical rough-in.

Order Metallics MPN NA141M. That single part number covers the 1/4 x 1 inch metal hammer drive nail-in anchor in the 1,000 count box; there are no finish or length choices to specify on it.