Pamex DD01-K160UL 4" High Door Knocker with UL 160 Degree Viewer

The DD01-K160UL viewer is built for a 1/2 inch bore, which is the common residential peephole hole. If the door already has a 1/2 inch hole drilled, the viewer drops straight in with no new boring. A larger existing hole (some older units used 9/16) will leave the barrel loose, so check the bore before ordering.

It adjusts from 1-1/8 inch to 1-7/8 inch, so it covers standard 1-3/8 inch interior doors and 1-3/4 inch entry doors without ordering a different barrel. Doors thicker than 1-7/8 inch, which you sometimes see on a built-up or insulated slab, are outside the range.

It carries a 20 minute UL rating, which is what most multi-family unit entry doors are specced to. That makes it usable on a rated apartment door where a non-rated knocker or viewer would fail inspection. Note it's a residential-duty item, so it isn't the pick for a rated door in a commercial corridor assembly.

It works for that where the doors fall between 1-1/8 and 1-7/8 inch thick and already have a 1/2 inch viewer bore, which covers most apartment entry slabs. Ordering one finish code across the building, say 613 oil rubbed bronze or 622 matte black, keeps the doors matching as units turn over, and the 20 minute UL rating means the same part goes on the rated openings too.

Both are door knockers with an integrated 160 degree viewer, and both are built on a 4 inch knocker body - the Pamex DD01-K160UL measures 1-3/4 inch by 4 inch overall, and the Delaney DLY-400x10 is a 4 inch door knocker series. The Pamex unit is 20 minutes UL rated, projects 5/8 inch off the face of the door, fits a 1/2 inch bore, adjusts for door thicknesses from 1-1/8 inch to 1-7/8 inch, and is a zinc die cast knocker with a brass viewer. It comes in matte black 622, polished chrome 625, oil rubbed bronze 613, bright brass 605 and satin nickel 619.

The Pamex DD01-K160UL is the one that carries the 20 minutes UL rating, along with a 160 degree viewer, a 1/2 inch bore, and adjustment from 1-1/8 inch to 1-7/8 inch of door thickness. The Delaney DLY-400x10 and DLY-4001 are 4 inch and 6 inch door knockers with 160 degree viewers - match them on knocker size and viewing angle, and specify the Pamex DD01-K160UL where the rating drives the selection.

Five: 605 bright brass, 613 oil rubbed bronze, 619 satin nickel, 622 matte black, and 625 polished chrome. Those are standard BHMA finish codes, so a property manager standardizing a building can match the knocker to lever and deadbolt finishes already on the doors by code rather than by eye.

A 160 degree viewer covers nearly everything directly in front of the door, including someone standing tight against the jamb or off to one side out of a narrower viewer's cone. On the Pamex DD01-K160UL that wide angle is combined with the knocker in one plate, so the tenant gets both functions from a single 1/2 inch bore instead of two separate preps.

The combination unit, like the Pamex DD01-K160UL, gives you one 1/2 inch bore and one screw pattern to install and align, which is why it's the usual choice on multi-family unit doors where you're doing dozens of openings. Separate pieces make sense when you want the viewer at one height and the knocker at another, or when you're only replacing one of the two. If you go combination, the 1-3/4 x 4 inch plate sets where both functions land on the door.

Delaney Hardware makes the same style in a 4 inch door knocker with a 160 degree viewer, which is the closest straight equivalent, and a 6 inch version if you want a larger plate on a wider entry door. The Pamex is the 4 inch size, so the Delaney 6 inch is the one to look at when the existing plate left a bigger footprint on the door and you don't want to see the old outline.

Size of the knocker body. The Delaney DLY-400x10 is the 4 inch door knocker and the DLY-4001 is the 6 inch door knocker, both with a 160 degree viewer. If the door already carries a 4 inch knocker outline, the 6 inch unit will not land on the same footprint. The Pamex DD01-K160UL is a 4 inch high knocker at 1-3/4 inch by 4 inch overall and is the direct-size peer to the DLY-400x10.

The knocker body is zinc die cast and the viewer itself is brass. Zinc die cast with a plated finish is the standard material for residential knockers, and the brass viewer barrel is the part that takes the weather through the bore. It's a residential-grade item, not built for the traffic a commercial entrance sees.