Emtek 3551 Harrison Brass Mortise Entrance Lockset - Entry Set

Handing is required on every Emtek mortise lock, including the 3551 Harrison. You pick LH, RH, LHR or RHR, and the two reverse options are for out-swing doors. Get this wrong and the latch bevel faces the wrong way, so stand inside the opening with the door swinging away from you: hinges on your left is left hand, hinges on your right is right hand. If the door swings toward you, it's the reverse version.

Two backsets are offered on the 3551 Harrison, 2-1/2 inch and 2-3/4 inch, so measure from the door edge to the center of the knob or lever spindle on what's there now and order to match. The lock body is cut for standard mortise door prep to ANSI A115.1, so if the existing pocket was machined to that standard and the backset matches, it goes back in the same hole.

1-3/4 inches is the standard build for the 3551 Harrison, and thicker doors are handled by calling out the actual thickness when you order (there's a door thickness field on the order for exactly that). Don't assume a thick door works out of the box; state the measured thickness so the spindles and screws come the right length.

F20 is the entrance function: key outside, and the inside lever or knob always retracts the latch for free egress, with the inside typically controlling the outside trim. F13 is the dormitory function, which is the one you want on a bedroom, unit door or a door where the occupant needs the outside to relock behind them. Both are keyed, single cylinder configurations on the 3551 Harrison, so you're choosing operation, not hardware count. Pick the function at order time; it's built into the lock body, not field changed.

The 3551 Harrison runs a Schlage C keyway, so it can be cut to an existing Schlage C-keyed system. You can order the set keyed alike across multiple doors or keyed different, and there's a keying-to-code option if you already have a bitting code from your locksmith. It's a single cylinder lock, key outside and thumb operation inside.

The 3551 Harrison is a UL Listed mortise lock with a UL 180 minute fire rating, which covers a 1-1/2 hour labeled opening such as a unit entry door off a corridor. Confirm the rest of the assembly, the door, frame and closer, carries the same or higher label.

The 3551 Harrison is a solid brass residential mortise set, built for houses and high-end residential openings rather than commercial traffic. For a commercial door where you need a Grade 1 lock body, look at the Cal-Royal NM8050 heavy duty Grade 1 office/entrance mortise lockset or the Corbin Russwin ML2003 from the ML2000 Series, both of which are rated Grade 1 for a 1-3/4 inch door.

The Emtek 3551 Harrison is a brass mortise entry lockset in a single-cylinder keyed entry function with 2-1/2 inch and 2-3/4 inch backsets. The Baldwin 6301 mortise lock body is the nearest peer in the decorative residential mortise space: it is an entrance/apartment function knob-by-knob set on a 2-1/2 inch backset and covers doors 1-3/4 inch and over. The lever version of that same body is the Baldwin 6301LS, entrance/apartment function, 2-1/2 inch backset, 1-3/4 inch and over. The practical difference is trim breadth - the Emtek 3551 body pairs with brass knob, crystal and porcelain, or lever trim, while the Baldwin bodies are ordered as knob-by-knob or lever-by-lever.

The Emtek 3551 Harrison is classified residential. For a commercial opening, the Cal-Royal NM8050 is a heavy duty Grade 1 office/entrance mortise lockset with an auxiliary deadlatch, built for 1-3/4 inch doors. The Hager 3850E is a Grade 1 office function mortise lock with lever and escutcheon on a 2-3/4 inch backset, non-keyed, covering 1-3/4 inch to 2-1/2 inch doors. Where the specification calls for a storeroom function on the entry, the Accentra 8805FL is a Grade 1 storeroom mortise lock from the 8800 Series with an Arcadia lever, and the Cal-Royal NM8080 is a Grade 1 storeroom mortise lockset offered with an interchangeable core option.

The Emtek 3551 Harrison is offered in an F13 dormitory function as well as F20 entrance, and it is a residential brass set. If the opening is a commercial dormitory or corridor, the Sargent 7925 is a heavy duty Grade 1 dormitory exit function mortise lock from the 7900 Series with rose trim and a single cylinder deadbolt. The distinction that decides it is the deadbolt: the 7925 carries one, while the 3551 is a single cylinder entry set with latch and strike plate.

Three near-misses come up. Mortise deadbolts are not entry sets: the Sargent 4874 is a double cylinder mortise deadbolt on a 2-3/4 inch backset and the Kaba Ilco 185 Series is a no-handing mortise deadbolt - both bolt the door but neither carries a latch or operating trim, where the Emtek 3551 ships as a complete set with latch and strike plate. Second, a cylindrical lock does not drop into a mortise pocket: the Schlage PC10 is a Grade 1 passage cylindrical lock, a different door prep entirely from the ANSI A115.1 mortise prep the 3551 uses. Third, dummy trim has no latch at all - the Schlage L0170 is Grade 1 half dummy mortise lever trim and the Falcon MESC600DT is dummy escutcheon lever trim for M9900 Series exit devices.

The Emtek 3551 Harrison is a mechanical single-cylinder entry set with no electrical provision. For an opening that has to be released or monitored from a system, the Schlage L9092EU mortise lock is an electric lock/unlock outside lever, keyed outside, with request to exit and 12/24VDC operation for 1-3/4 inch doors. The BEST 45HW Series is a wired electromechanical heavy duty mortise lock with 12V/24V operation, and the Command Access ML190 Series is a heavy-duty motorized mortise lock in storeroom function with field selectable fail safe or fail secure operation on 24VDC. For wireless credential management, the Schlage LEMD-GRW is a Grade 1 ENGAGE Series wireless mortise lock with a 125kHz proximity reader and a 3 hour fire rating.

The Emtek 3551 Harrison is UL listed with a UL 180 minute fire rating on standard mortise ANSI A115.1 door prep. Among the peers, the Falcon MA101 Grade 1 heavy duty mortise passage lock is fire rated, and the Schlage Electronics LEMD-GRW ENGAGE wireless mortise lock and LEBMB-ADD mobile-enabled mortise lock both carry a 3 hour fire rating. Falcon MESC600DT dummy escutcheon lever trim is also fire rated, though as dummy trim it does not latch. Fire door assemblies are rated as a whole, so the label on the door governs which of these is acceptable.

It ships as a complete set: the mortise lock body, the latch and the strike plate, plus the interior knob or lever you select. The only separate decisions are which inside trim style you want and the keying. You'd still need the door machined to standard mortise prep if it isn't already.

Inside trim is your choice from Emtek's full range, brass knobs, levers, and crystal or porcelain knobs, so you can run the Ace, Spoke, Orb or Round knob, a lever like the Stuttgart, Athena, Milano or Rope, or a crystal knob such as the Windsor or Bristol. That's how you match the 3551 to the rest of the door hardware in the house rather than settling for a fixed handle.

Baldwin's 6301 entry/apartment mortise lock body is the closest decorative equivalent, sold in knob-by-knob (6301) or lever-by-lever (6301LS) versions with a 2-1/2 inch backset for doors 1-3/4 inches and over. Baldwin also does the 6310 entry/storeroom body on the same 2-1/2 inch backset, which starts at 1-3/8 inch doors if you're working on a thinner older door than the Emtek's 1-3/4 inch standard.

No, the 3551 Harrison is a mechanical, keyed lock with no electronic option. If you need code or credential access on a mortise prep, the Alarm Lock DL2700CR Trilogy T2 and DL3500CR are keypad electronic mortise locks for doors 1-5/8 to 1-7/8 inches, and the Schlage LE Series LEBMB-ADD is a mobile-enabled mortise lock with push button and LED covering privacy, office and apartment functions on a 1-3/4 inch door.

Keyed alike is one of the two keying choices on the 3551 Harrison, so a run of exterior doors can all take the same key. If you're adding to doors already keyed, use the keying-to-code option and supply the existing code; the lock is a Schlage C keyway, so the code has to be on that keyway.

The Emtek 3551 Harrison is a keyed single-cylinder entry set. On an opening that only needs to latch, the Schlage PM010 is a Grade 1 non-keyed passage latch mortise lock for 1-3/4 inch doors, and the Hager 3810S is a Grade 1 passage mortise lock with rose on a 2-3/4 inch backset covering 1-3/4 inch to 2-1/2 inch doors; the Hager 3810E is the same passage function with an escutcheon instead of a rose. For a bed or bath door, the Hager 3840S is a Grade 1 privacy mortise lock, 2-3/4 inch backset, 1-3/4 inch to 2 inch doors, and the Cal-Royal NM8440 is a Grade 1 privacy mortise lockset with a deadbolt on 1-3/4 inch doors.

The Emtek 3551 Harrison is a mechanical, non-electronic lockset keyed to a Schlage C keyway. Nothing in the Harrison brass family is electrified, so a keyless opening moves to a different platform. The Dormakaba E-Plex 2066 is an electronic pushbutton keyless mortise lock for wide stile doors, and the PowerPlex P2066 is the self-powered version of that 2000 Series mortise body. For credentialed access, the Accentra NTM623-NR is a Grade 1 nexTouch mortise lock with a capacitive touchscreen keypad and cylinder override with no deadbolt, and the Dormakaba LX-I-M002 Saffire is an RFID mortise lockset with BLE mobile access at BHMA Grade 2. These are not retrofits of the Harrison trim - the escutcheon and reader housing are part of the lock.

The Emtek 3551 Harrison requires handing on every order, in LH, RH, LHR or RHR for out-swing doors. When the hand is not known at the time of order, the BEST 45H Series heavy duty mortise lock body is public entrance function with field reversible operation, and the Falcon MA101 is a Grade 1 heavy duty mortise passage lock, also field reversible and fire rated. The Kaba Ilco 185 Series mortise deadbolt carries no handing at all. Note that the BEST and Falcon bodies are commercial lock bodies, while the 3551 is a residential brass entry set.

The Emtek 3551 Harrison is standard for 1-3/4 inch doors with thicker doors specified at order. For a thicker opening, the Hager 3800 Series covers 1-3/4 inch to 2-1/2 inch on the 3810E passage and 3850E office locks, and the Baldwin 6310 entry/storeroom mortise body covers 1-3/8 inch and over. For a thin stile, the Marks USA 21AC and 22AC ornamental iron mortise locks are built for 1 inch doors, and the Alarm Lock Trilogy DL2700CR and DL3500CR electronic mortise locks cover 1-5/8 inch to 1-7/8 inch.

The Emtek 3551 Harrison is a brass residential entry set with knob, crystal or lever trim, which is not an anti-ligature profile. For those openings the TownSteel MRX-L-01 is a Grade 1 heavy duty stainless steel anti-ligature lever mortise lockset in passage function for 1-3/4 inch doors, and the MRX-A-01 is the same passage function with satin stainless ligature resistant arch trim. Where a push/pull is preferred, the Marks USA 5PDN is a Grade 1 hospital passage mortise push/pull paddleset in satin stainless steel, ligature resistant and ADA compliant.

The Emtek 3551 Harrison is a single-cylinder keyed entry set. For a double cylinder mortise entrance, the Marks USA 21AC is an entrance double cylinder Unilock ornamental iron mortise lock with a round knob for 1 inch doors, and the 22AC is the same double cylinder ornamental iron entrance configuration with a round knob, also 1 inch. On a deadbolt-only opening, the Sargent 4874 is a double cylinder mortise deadbolt with a 2-3/4 inch backset, which matches one of the two backsets the 3551 is built in.

Eight finishes, and the choice matters if you're matching existing hardware: Flat Black (US19), French Antique (US7), Oil Rubbed Bronze (US10B), Pewter (US15A), Polished Brass Lifetime (US3), Polished Chrome (US26), Satin Nickel (US15), and Unlacquered Brass (US3NL). Unlacquered brass is the one that will patina over time rather than staying bright, so specify it deliberately if you want a living finish.