Baldwin 6503009 2-1/8" Pre-Drilled Standard Door Adapter

Yes, and it isn't optional. The Baldwin 6503.009 adapter must be used when a door is pre-drilled to the industry standard 2-1/8 inch bore. It retrofits any 2.125 inch pre-bored door so an Estate knob or lever can be installed. Skip it and the Estate trim has nothing to mount to on a standard bore.

It covers both common residential and light commercial thicknesses, 1-3/8 and 1-3/4 inch doors. Those are the two standard thicknesses on interior and entry doors, so most existing openings are covered without a special order.

The rose or escutcheon has to be at least 2.625 inches to hide the adapter. Anything smaller leaves the adapter ring visible around the bore. If you're speccing Estate trim for a whole floor of doors, check the rose diameter before you order, because that's the piece that usually forces a change, not the adapter itself.

Baldwin recommends it for knobs and lighter levers. For a heavy lever, it's not the recommended pairing. It does work with both knob strength and lever strength latches, so the latch side isn't the limit, the weight of the trim is.

It's listed for full dummy, passage, and privacy functions. Those are the three it covers, so bedroom and bath privacy sets, hall and closet passage sets, and one-sided dummy trim are all in scope. Keyed entry is not among the functions listed for it.

No - they solve different problems. The Baldwin 6503009 is a pre-drilled standard door adapter that retrofits 2-1/8 inch pre-bored doors so Estate knobs and levers can be installed, and it accommodates 1-3/8 and 1-3/4 inch door thickness. The Trimco 1268 is an anchor plate measuring 3-1/2 inches in diameter. If the goal is mounting an Estate knob or lever into an industry-standard 2-1/8 inch bore, the 6503009 is the part that does it; an anchor plate does not adapt the bore.

Per opening you need the Estate knob or lever set, a rose or escutcheon of 2.625 inches or larger, and one 6503.009 adapter for each 2-1/8 inch bored door. The adapter handles the door itself at either 1-3/8 or 1-3/4 inch thickness, so you don't need a separate part for the thinner interior doors.

It's neither. The 6503.009 is a bore adapter, a plate that sits in the door's 2-1/8 inch cross bore so Estate knob and lever trim can mount to a standard prep. The latch is a separate part, and the adapter works with both knob strength and lever strength latches. If what you need is a strike, that's a different item, such as the Cal-Royal ASA478 template ASA strike.

No. The Cal-Royal ASA478 is a template ASA strike for commercial door hardware - it is the frame-side piece the latch engages. The Baldwin 6503009 is the door-side adapter that must be used when doors are pre-drilled to the industry standard of 2-1/8 inch, and it works with full dummy, passage, and privacy functions on both knob and lever strength latches. A strike does not substitute for the bore adapter; on a full dummy application there is no latch for a strike to receive at all.

The 6503009 addresses the bore itself - it adapts a 2-1/8 inch pre-bored hole for Estate knob and lever installation, with Baldwin recommending it on knobs and lighter levers. Where the requirement is holding a non-latching or dummy-style door closed rather than adapting a bore, a roller latch is the different approach: the ABH 1890 Series roller latch comes with a full lip cast strike and 5/16 inch adjustable projection, and the ABH 1895 Series roller latch comes with a T strike and 1/2 inch adjustable projection. These mortise into the door edge and do not adapt a cylindrical bore, so they are chosen when the trim is not being mounted through a 2-1/8 inch hole.