Turning the inside knob or lever retracts the deadbolt and the latch together, so someone inside gets out in one motion without having to thumbturn the bolt first. The 6375 is an entry-function mortise lock body with a 1 inch throw deadbolt carrying saw-proof inserts, so the door stays bolted for security but never traps anyone behind it. That is the reason this body gets specified on a primary entry door in a home or a multi-family unit rather than a plain double-cylinder mortise deadbolt.

Yes, that is a real mismatch. Backset is the distance from the door edge to the center of the knob spindle, and at 2-1/2 inches the 6375 puts the knob a quarter inch closer to the edge than a 2-3/4 inch lock does. Drop it into a pocket cut for 2-3/4 and the knob hole and cylinder hole in the door face will not line up. For a 2-3/4 inch backset opening, look at a body built for it, such as the Hager 3800 Series mortise locks, which are 2-3/4 inch backset.

Handing is required, and it is not field reversible on this body. Both left hand and right hand are built. Stand outside the door, on the side that swings away from you: if the hinges are on your left it is left hand, hinges on the right is right hand. Get it wrong and the latch bevel faces the wrong way and will not catch the strike. If you would rather not commit to a hand, a field reversible body such as the BEST 45H Series is the other route, though that is a heavy duty commercial lock rather than a residential Estate Series part.

An ASA strike is what this lock is set up for, the tall rectangular strike with the radius corners, standard 1-1/4 x 4-7/8 inch face prep in a hollow metal or prepped wood frame. If your frame already carries an ASA prep the strike drops straight in. A frame cut for a small round-corner residential strike needs the mortise lengthened and the screw holes moved. Account for the 1 inch deadbolt throw too, the strike box has to be deep enough to swallow it.

Just the body. The 6375 is the mortise case that goes inside the door pocket, with the latch, the 1 inch deadbolt and the faceplate. Knobs or levers, roses or escutcheon plates, and the cylinder are separate Baldwin Estate Series trim items you pick to match the rest of the openings. The case is built for knob by knob or lever by lever trim, so either style will drive it. If you want a single part number that arrives as a finished set instead, a complete mortise lockset like the Cal-Royal NM8050 entrance lock is that kind of product.

Sometimes, and three measurements tell you before you buy. Check the backset, which has to be 2-1/2 inches. Check the faceplate on the door edge, the 6375 needs a 1-1/4 x 8 inch cutout. And check the door itself, anything 1-3/8 inches or thicker is fine. Older residential mortise pockets are often close on all three, which is why the 2-1/2 inch backset exists. Where the old case is narrower or a different height on the edge, you are into patching the door edge rather than a straight swap.

The Cal-Royal NM8050 is a heavy duty Grade 1 office/entrance mortise lockset with an auxiliary deadlatch, listed for a 1-3/4 inch door thickness. The Baldwin 6375 is an entry-function mortise lock body with a 2-1/2 inch backset and a door thickness range of 1-3/8 inch and over, and it is a residential Estate Series product. Where a project calls for a Grade 1 entrance lockset on a standard 1-3/4 inch commercial door, the NM8050 is the direct functional counterpart.

The Baldwin 6375 mortise lock body is a 2-1/2 inch backset, which is the Estate Series residential dimension and will not line up with a door prepped at 2-3/4 inches. The Hager 3800 Series carries 2-3/4 inch backset mortise locks across several functions: the 3810S passage with rose, the 3810E passage with escutcheon, the 3850E office with lever and escutcheon non-keyed, and the 3840S privacy. The Sargent 4874 double cylinder mortise deadbolt is also a 2-3/4 inch backset. Confirm the backset on the existing pocket before ordering, because backset is not adjustable on a mortise body.

The Baldwin 6375 is an entrance mortise lock body with emergency egress, so turning the inside knob or lever retracts the 1 inch throw deadbolt and the latch together. It is an Estate Series residential product. For an institutional corridor, the Sargent 7925 is a Grade 1 heavy duty mortise lock with a dormitory exit function, rose trim and a single cylinder deadbolt, which delivers the same single-motion inside release in a commercial line. The Corbin Russwin ML2003 is a Grade 1 mortise classroom lockset for 1-3/4 inch doors if the opening needs classroom rather than exit function.

No. The Emtek 3102 Memphis, 3104 Hamilton, 3106 Manhattan and 3019 Brisbane are all dummy function mortise entrance locksets. A dummy has no working latch and no bolt, so it mounts on an inactive leaf and pulls only. The Baldwin 6375 is an operating mortise lock body with entry function, emergency egress, and a 1 inch throw deadbolt with saw-proof inserts. Order the Emtek dummy only for the inactive half of a pair of doors, and pair it with an operating lock on the active leaf.

The Baldwin 6375 is a knob by knob or lever by lever mortise lock body with a door thickness range of 1-3/8 inch and over, which suits a wood or standard door. For narrow ornamental iron, the Marks USA 21AC is an entrance double cylinder Unilock ornamental iron mortise lock with a round knob listed for a 1 inch door thickness, and the Marks USA 22AC is the same style entrance double cylinder ornamental iron mortise lock with round knob, also for a 1 inch door. Measure the stile thickness first, since a 1 inch iron door will not accept a body sized from 1-3/8 inch up.

The Baldwin 6375 is an Estate Series residential entrance mortise lock with knob or lever trim, which is not a ligature resistant design. For a behavioral health opening, the TownSteel MRX-L-01 is a Grade 1 heavy duty stainless steel anti-ligature lever mortise lockset with passage function for 1-3/4 inch doors, and the MRX-A-01 is the same passage function with satin stainless steel ligature resistant arch trim. The Marks USA 5PDN is a Grade 1 hospital passage mortise push/pull paddleset that is ligature resistant and ADA compliant in satin stainless steel.

It is built and catalogued as a residential lock, in Baldwin's Estate Series, and the 2-1/2 inch backset is a residential dimension rather than the 2-3/4 inch commercial standard. For an office, school or healthcare opening where a Grade 1 body is on the drawing, go to something like the Corbin Russwin ML2003 or the Cal-Royal NM8050, both Grade 1 mortise locks at 1-3/4 inch door thickness. Save the 6375 for houses, condo entries and high-end apartment units where the Estate trim is the point.

Five: 056 Lifetime PVD Satin Nickel, 076 Lifetime PVD Graphite Nickel, 102 Oil Rubbed Bronze, 190 Satin Black and 260 Polished Chrome. Every one is available in both hands. The only part of the body you see once the door is hung is the latch faceplate on the door edge and the strike, so order the finish that matches the knobs and roses going over it, or the edge of the door will read as a different metal than the trim.

The bolt throws a full 1 inch and has saw-proof inserts in it, so a blade run through the gap between door and frame skates off the hardened insert instead of cutting the bolt. That 1 inch of projection is what gets the bolt deep into the frame rather than just past the stop. Because it lives in the same case as the latch, one lock body does the job of a latchset plus a separate deadbolt, and the inside knob retracts both at once for egress. A second bolt above it buys you a second strike point, not a longer throw.

If the existing hardware is Baldwin Estate Series, yes, the 6375 is an Estate Series body and takes the same Estate knob and lever trim, so the openings stay consistent. Match on two things when you order: the finish code, and the hand of each door. The body is offered in 056 Satin Nickel, 076 Graphite Nickel, 102 Oil Rubbed Bronze, 190 Satin Black and 260 Polished Chrome, so the odds are the finish already on your doors is one of them. Baldwin's lower Reserve and Prestige lines use different trim, so a unit with those will not share parts with this.

The 6375 is a keyed entry function, so it takes a cylinder and the cylinder is ordered separately from the body. Entry function means keyed outside with free egress inside, the inside knob always retracts latch and bolt without a key, which is what makes it legal to use on a bedroom-wing or apartment entry door. If you need both sides keyed instead, that is a double cylinder product, such as the Sargent 4874 double cylinder mortise deadbolt.

The Baldwin 6375 is a keyed entry function with a 1 inch throw deadbolt with saw-proof inserts, which is more lock than an interior door needs. For a non-locking opening, the Schlage PM010 is a Grade 1 passage latch mortise lock, non-keyed, for 1-3/4 inch doors. The Falcon MA101 is a Grade 1 heavy duty mortise passage lock with field reversible operation and a fire rating. The Hager 3810S is a passage mortise lock with rose and a 2-3/4 inch backset. All three latch only, with no deadbolt and no cylinder to key.

The Baldwin 6375 is a mechanical entry mortise lock body with emergency egress and a 2-1/2 inch backset. For credential access with the same egress intent, the Dormakaba E-Plex E5086 is a Grade 1 entry/egress electronic pushbutton and card back to back mortise lock. The Accentra NTM623-NR nexTouch Generation 3 mortise lock uses a capacitive touchscreen keypad with no deadbolt and cylinder override. The BEST 45HZ EZ Series is an electronic keypad mortise lock with key override. These are commercial electronic bodies, so verify door prep and thickness against the existing pocket before swapping.

The Baldwin 6375 is an entry function lock, so the outside can be left unlocked. For an opening that must stay secured from outside, storeroom function is the right call: the Accentra 8805FL is a Grade 1 storeroom mortise lock with an Arcadia lever in the 8800 Series, and the Cal-Royal NM8080 is a heavy duty Grade 1 storeroom mortise lockset with an interchangeable core option for 1-3/4 inch doors. Storeroom keeps the outside lever fixed and the inside free, where entry function lets the outside be unlocked and left that way.

Not on its own. The Sargent 4874 is a double cylinder mortise deadbolt with a 2-3/4 inch backset in the 4870 Series, so it throws a bolt but carries no latch and no knob or lever operation. The Baldwin 6375 combines a latch with a 1 inch throw deadbolt with saw-proof inserts and releases both from inside in one motion for emergency egress. A double cylinder deadbolt requires a key on both sides, which is a different egress condition entirely. Use the 4874 as an auxiliary bolt above a separate latching lockset, not as a one-for-one replacement.

The Baldwin 6375 mortise lock body is ordered as left hand or right hand, so the handing has to be established before the order. If a job needs stock that can be set on site, the BEST 45H Series heavy duty mortise lock body with public entrance function is field reversible, and the Falcon MA101 Grade 1 heavy duty mortise passage lock is field reversible as well. The Kaba Ilco 185 Series mortise deadbolt requires no handing at all. Field reversible bodies let a contractor carry one part number for both swings.

The Baldwin 6375 is a keyed entry function with a deadbolt, which is more than a bathroom door calls for. For privacy, the Cal-Royal NM8440 is a heavy duty Grade 1 privacy mortise lockset with deadbolt for 1-3/4 inch doors, and the Hager 3840S is a privacy mortise lock with a 2-3/4 inch backset for doors from 1-3/4 inch to 2 inch. Privacy function locks from inside with a turn and releases with an emergency tool from outside, with no keyway to manage.

The Baldwin 6375 is a mechanical body with no electrical provision. For electrified control, the Schlage L9092EU with 03A trim is an electric lock/unlock outside lever mortise lock, keyed outside, with request to exit and 12/24VDC, heavy duty for a 1-3/4 inch door in a corridor function. The BEST 45HW Series is a wired electromechanical mortise lock with 12V and 24V operation. The Command Access ML190 Series is a motorized mortise lock with field selectable fail safe or fail secure operation on 24VDC. Each requires power transfer through the hinge or frame, which the mechanical 6375 does not.

No. The Sargent 130KB is a standard duty mortise thumbturn in the 8200 Series, and the Sargent 130W is a mortise thumbturn with a round backplate in the 7800 Series. Both are trim pieces that operate a bolt from inside; neither is a lock body. The Baldwin 6375 is the mortise lock body itself, with a 1 inch throw deadbolt with saw-proof inserts, a 2-1/2 inch backset and a 1-1/4 inch by 8 inch latch faceplate. A thumbturn is ordered to complete a lock body, not to replace one.