It only latches. Passage function means no key, no thumbturn, no push button, and no locking of any kind. The lever retracts the latch from either side at all times. That makes it right for a hallway, a closet, a pantry, or a laundry door. For a bedroom or bathroom you need a privacy set with a turn button instead, and for an exterior or lockable office door you need an entry or keyed function.

No handing to specify. The 5166 lever is reversible, so the same set works on a left or right hand door and you set the lever direction during install. One part number covers every opening in the house.

It is built as residential hardware, so single family and light traffic is where it belongs. For a leased corridor, a school, or anything with real cycle counts, go to a commercial cylindrical passage lever instead: the Falcon K101 is Grade 1 heavy duty and fire rated with a 1-3/8 to 2 inch door thickness range, and the Corbin Russwin CL3110 is a Grade 1 vandal resistant passage lever, fire rated, for 1-3/4 to 2 inch doors. If the budget is tighter and traffic is moderate, the Hager 2510 is a Grade 2 passage lever covering 1-3/8 to 2 inch doors.

No. The 5166 is a 2-3/8 inch backset set, which is the common interior bore. If your door is prepped at 2-3/4 inches, that is the other standard commercial and exterior backset and you need a lever prepped or adjustable for it. Measure from the door edge to the center of the 2-1/8 inch cross bore before ordering.

If the existing knob sits in the standard 2-1/8 inch cross bore on a 2-3/8 inch backset, the 5166 goes into the same prep, no new boring. Two things to check before you swap: the door has to be between 1.37 and 1.75 inches thick, and you need 2.9 inches of projection plus a 4.59 inch lever clear of anything the door swings against. The round rose will cover a standard round knob rose footprint.

The Baldwin 5166 covers doors from 1.375 inch to 1.75 inch. For thicker stock, the Falcon K101 Grade 1 passage lock covers 1-3/8 inch to 2-1/4 inch, the Hager 2510 Grade 2 passage lever covers 1-3/8 inch to 2 inch, and the Arrow GL01 Grade 2 passage lock with Sierra lever covers 1-3/4 inch to 2 inch.

The Baldwin 5166 is a residential passage leverset with a 2-3/8 inch backset and reversible handing. For a corridor or common-area door where a graded lockset is wanted, the Falcon K101 is a Grade 1 passage cylindrical lock with non-handed levers, and the Falcon T101 is a Grade 1 heavy-duty cylindrical passage lever with pressure release technology. Both hold the same passage function, so the door swings freely from either side with no key or thumbturn.

The Baldwin 5166 is a residential passage set. Where the opening carries a fire rating, the Falcon K101 Grade 1 passage cylindrical lock is fire rated and covers doors 1-3/8 inch to 2-1/4 inch thick, and the Corbin Russwin CL3110 passage/closet lever is a fire rated Grade 1 vandal resistant lock for doors 1-3/4 inch to 2 inch thick.

No. The Baldwin 5166 is a passage set with a working latch, so the lever retracts a latchbolt and the door stays shut until it is operated. A dummy lever is surface trim with no latch at all: the Accentra 455LN Augusta is a Grade 1 single dummy cylindrical lever, the BEST 9K 1DT is a Grade 1 single dummy trim lever, and the Emtek Arts & Crafts dummy is sold as a pair. Those are for doors held by a ball catch or roller catch, not for a door that needs a latch.

The Baldwin 5166 has no privacy or locking feature, so it will not hold a bath or bedroom door closed against entry. For that opening the Kwikset 300BRNL Breton is a Grade 3 privacy leverset for doors 1-3/8 inch to 1-3/4 inch, and the Hager 2540 with Withnell lever is a Grade 2 privacy cylindrical lock for doors 1-3/8 inch to 2 inch.

The Baldwin 5166 is a non-keyed passage set on a 2-3/8 inch backset. For a keyed opening, the Cal-Royal AG00 entrance lever is a Grade 2 lock with a 6-pin Schlage C keyway, keyed different, on a 2-3/8 inch backset, and the Falcon B511CP6D is a Grade 2 cylindrical lever with entry/office function. The Cal-Royal AG03 classroom lever is on a 2-3/4 inch backset, which is a different bore center from the 5166.

Projection is 2.9 inches off the door, with a 4.59 inch lever grip. That matters where a door swings back against a wall, a cabinet, or an adjacent casing: check you have clearance for a lever that long before you commit, especially in a tight closet or a corner return. The rose is round.

The passage set ships complete, with everything needed to mount it on the door, so there is no separate latch or strike to add to the order. The only thing you choose is finish.

Eight finishes, and that is the full range: Satin Brass (044), Polished Nickel (055), Satin Nickel (056), Graphite Nickel (076), Oil Rubbed Bronze (102), Venetian Bronze (112/11P), Satin Black (190), and Polished Chrome (260). If you are matching hinges and stops across a house, pick the finish first and repeat it on every opening, since the passage, privacy, and entry functions in a Baldwin suite carry the same finish codes.

A dummy trim, not this. The 5166 is a working passage set with a live latch. For a false door, a closet pair, or a fixed pull, use a dummy: Emtek offers dummy pairs in the Arts and Crafts and Cortina lever designs, and the Callan Bentley is a Grade 2 dummy lever. On a commercial opening the BEST 9K Series 1DT is a Grade 1 single dummy trim.

The Kwikset 200BRNL Breton passage leverset is a Grade 3 passage lock for doors 1-3/8 inch to 1-3/4 inch thick, and the Callan Asheville is a Grade 3 passage leverset in satin nickel. Both do the same job as the Baldwin 5166 on a hall or closet door: latch only, no key and no privacy turn.

The Baldwin 5166 pairs with the 5046 round rose. For a square trim shape in the same passage function, the Bravura Tampa is a Grade 2 passage leverset with square trim. Round-trim passage alternatives include the Bravura Atlanta, the Bravura Orlando, and the Bravura Miramar in US4 satin brass.

The Baldwin 5166 is a mechanical passage set with no code entry. Where a code is wanted on a door that otherwise swings free, the Lockey 2835 is a mechanical pushbutton keyless lever lock with passage function and ADA compliance for doors 1-3/16 inch to 2 inch, the Lockey 2835DC adds a double combination on the same thickness range, and the Lockey 1150 is a heavy duty mechanical keypad lever set with double combination and passage function for doors 1-1/8 inch to 2 inch.

The Baldwin 5166 is catalogued for residential use. For a facility standard in the same passage function, the Accentra 5301LN Augusta is a Grade 2 cylindrical lever in passage/closet function from the 5300 Series, the Accentra 4601LN with Augusta trim is a Grade 2 passage lever from the 4600 Series, and the Falcon B101 is a Grade 2 medium duty passage lever with a non-handed design. Design Hardware offers both a Grade 2 J75 and a Grade 1 X75 flat-lever passage lockset for 1-3/4 inch doors.

Tubular, bored through the door face. That is the lever set you install with two screws through the rose into the standard 2-1/8 inch cross bore, not a mortise pocket cut into the door edge. If your door already has a mortise pocket, a bored lever like this will not fill it.