Sargent 7855 Mortise Office En...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$947.02
$471.89
Sargent 7800 Series - Mortise Office or Entry Knob Lockset

Sargent 7855 Mortise Office Entry Knob Lockset with Grade 1 Security

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Model: 7855-26D
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$947.02
$471.89
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Sargent 7855 Mortise Office Entry Knob Lockset with Grade 1 Security and Fire Rating

Professional-Grade Mortise Lock Solution

The Sargent 7855 Mortise Office Entry Knob Lockset delivers commercial-grade security with ANSI/BHMA A156.13 Series 1000 Grade 1 operational and security ratings. This mortise lock features an 8" x 1-1/4" front with 1" x 5/8" one-piece anti-friction reversible latch and 1-1/4 inch strike lip for reliable performance. UL and cUL listed for fire doors and windstorm applications with ANSI/UL 10C positive pressure fire test certification.

Professional Features & Benefits

  • Grade 1 Security Rating: ANSI/BHMA A156.13 Series 1000 operational and security Grade 1 certification for maximum commercial security performance.
  • Fire-Rated Construction: UL and cUL listed with ANSI/UL 10C positive pressure fire test certification for fire door and windstorm applications.
  • Commercial Front Plate: 8" x 1-1/4" front size with 1-1/4 inch strike lip accommodates standard commercial door preparations.
  • Anti-Friction Latch System: One-piece anti-friction reversible latch with 1" x 5/8" dimensions provides smooth operation and easy field reversibility.
  • Patented Design: Patented construction with pre-assembled components ensures fool-proof installation and reliable operation.
  • Dual Operation Modes: Key outside retracts latchbolt while trim inside always retracts latchbolt, with outside trim remaining locked for controlled access.
  • Auxiliary Deadlatch: Integrated auxiliary deadlatch prevents forced entry and ensures positive latching in all conditions.
  • Manufacturer Warranty: 10 Year warranty coverage for added confidence and long-term protection.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Installation & Operation

  1. Review manufacturer specifications and verify door preparation requirements including door thickness, stile width, and handing as applicable to this product.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and/or frame surfaces.
  3. Prepare door and frame by drilling required holes and routing as specified in manufacturer instructions.
  4. Install all mounting hardware and secure the device to door and frame per manufacturer torque specifications.
  5. Adjust operational components for proper alignment, latching, and smooth operation throughout the full range of motion.
  6. Test device operation to verify proper function and make final adjustments as needed. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings

Why Choose Sargent Quality?

Sargent mortise locksets deliver professional-grade reliability with patented construction and pre-assembled components rated for Grade 1 security performance. 10 Year warranty coverage provides long-term protection and confidence. Engineered for demanding commercial applications where dependable security and fire-rated performance are essential.

Product Specs

Series:
7800 Series
Product Group:
Mechanical Locks
Product Subgroup:
Mortise Locks and Trim
Product Type:
Mortise Locks
Subcategory:
Mortise Locks and Trim
Commercial/Residential:
Commercial
Lock Function:
Office/Entry
Keyed Function:
Mortise Lock
Lock Type:
Mortise
Product Model:
7855
Product Function:
Office/Entry
Product Category:
Mechanical Locks
Department:
Door Hardware

Sargent 7855-26D – Frequently Asked Questions

1) How does the Sargent 7855 office/entry mortise lock actually behave when someone turns the knob?
Office/entry function: the inside knob always retracts the latchbolt, so egress is free at all times. The outside knob can be left locked, and the key from outside retracts the latchbolt. An auxiliary deadlatch rides against the strike to keep the latch from being shimmed. That combination is what you want on a tenant suite door or an office that gets locked off at the end of the day but never restricts anyone leaving.
2) What is the difference between ordering the Sargent 7804 body only and the 7804-OB version?
Three build levels are offered. The 7804 body only is the mortise lock case on its own, no trim and no cylinder, which is what you buy when you already have knobs, roses and a cylinder on hand or are standardizing trim separately. The 7804-OB adds the O-rose, B-knob trim and an LA keyway cylinder, so it arrives complete. The 7804-OB-LC ships with the same O-rose and B-knob trim but less cylinder, which is the one to order when your facility is keyed into an existing system and the locksmith is supplying cylinders from stock.
3) Can I use the Sargent 7855 mortise lock on a fire-rated door?
Yes. The 7855 is UL and cUL listed for fire doors and carries ANSI/UL 10C positive pressure fire test certification. It is also listed for windstorm applications. Office/entry function keeps free egress from the inside, which is what a fire door assembly needs on the egress side.
4) Will the Sargent 7855 drop into an existing ANSI mortise pocket, and does the strike lip matter?
The lock has an 8 inch by 1-1/4 inch front, which is the standard commercial mortise face size, so it suits a door already prepped for a full-size mortise case. The strike lip is 1-1/4 inch. Check the lip length against your frame: the lip has to clear the frame stop and reach the door face, so a deep stop or a heavy gasket may call for a different lip.
5) Is the Sargent 7855 handed, or can I stock one lock for both left and right doors?
The latch is a one-piece anti-friction reversible latch measuring 1 inch by 5/8 inch, so handing is changed in the field rather than ordered. For a property manager carrying spares across a building, that means one lock body covers both hands.
6) Does the Sargent 7855 meet a Grade 1 spec for a government or healthcare project?
It is rated ANSI/BHMA A156.13 Series 1000 Grade 1 for both operational and security performance, the top tier for mortise locks, and it is a commercial-duty product rather than residential. With the UL and cUL fire listing on top of that, it clears the usual hardware schedule language for schools, hospitals, municipal buildings and multi-tenant residential.
7) Does the Sargent 7855 come keyed, and what keyway do I get?
It depends which build you order. The 7804-OB arrives with a cylinder in the LA keyway. The 7804-OB-LC comes less cylinder, so you supply your own to match an existing masterkey system. The body-only 7804 has no cylinder or trim at all. On the keyed version, the key works from the outside to retract the latchbolt.
8) What is the closest equivalent to the Sargent 7855 office/entry mortise lock from another manufacturer?
The Cal-Royal NM8050 is the nearest match in function and rating. It is a heavy duty Grade 1 mortise lockset with entrance/office function and an auxiliary deadlatch, prepared for 1-3/4 inch doors. The Sargent 7855 is also an office/entry mortise lockset carrying ANSI/BHMA A156.13 Series 1000 Grade 1 operational and security ratings with an integrated auxiliary deadlatch. The main difference is trim: the Sargent 7855 is offered as a knob lockset, including 7804-OB with LA keyway cylinder, O-rose and B-knob.
9) I need a storeroom function instead of office/entry on a mortise door - what should I order?
Office/entry lets the inside trim always retract the latch while the outside trim can be left locked or unlocked, which is not what you want if the outside lever must stay locked at all times. For that, the Accentra 8805FL is a Grade 1 storeroom mortise lock in the 8800 Series with an Arcadia lever, 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.
10) I need a Grade 1 office/entrance mortise lockset but not from Sargent. What else is there?
The Cal-Royal NM8050 is the closest cross-brand match: Grade 1, entrance/office function, with an auxiliary deadlatch, listed for 1-3/4 inch doors. If the opening actually needs a different function, stay in that Cal-Royal family, the NM8080 is storeroom and the NM8070 is classroom. Accentra's 8805FL is Grade 1 but storeroom function with an Arcadia lever, so the outside lever stays locked at all times, which is not the same behavior as office/entry.
11) Should I specify a knob or a lever on an office entry mortise lock?
The 7855 as configured is a knob lockset, with the B-knob and O-rose on the trimmed versions. Knobs are fine for a general commercial opening, but if the door is on an accessible route your spec will likely call for lever trim instead. Lever alternatives in the same Grade 1 mortise class include the Accentra 8805FL with the Arcadia lever and the Corbin Russwin ML2003, though both of those are different functions (storeroom and classroom) rather than office/entry.
12) I need keyless or electronic access on this opening instead of a keyed mortise lock. What replaces the 7855?
A mechanical office/entry lock like the 7855 will not give you codes, credentials or audit trail. For pushbutton keyless in a mortise prep, the Dormakaba E-Plex 2066 is an electronic pushbutton mortise lock. For credential-based access, the TownSteel FME-2000 is a Grade 1 heavy duty mortise lockset with RFID, and Alarm Lock's Trilogy DL3500CR is a Grade 1 electronic mortise lock with 300 user codes for 1-5/8 to 1-7/8 inch doors. Note those are different functions, so match the function to the opening, not just the technology.
13) Is a Corbin Russwin ML2003 a substitute for the Sargent 7855?
Not for the same opening. The Corbin Russwin ML2003 is a Grade 1 mortise lockset in the ML2000 Series with classroom function for 1-3/4 inch doors, meaning the outside trim is locked and unlocked by key only. The Sargent 7855 is an office/entry function, where the key retracts the latchbolt from outside and the inside trim always retracts it. Both are Grade 1 mortise bodies, so the door prep family is similar, but the functions are not interchangeable on a spec.
14) What is the difference between the Sargent 7855 and a Baldwin 6301 entry mortise lock body?
The Baldwin 6301 is an entrance/apartment function mortise lock body with a 2-1/2 inch backset, for doors 1-3/4 inch and over, and is offered knob by knob or lever by lever as the 6301LS. The Sargent 7855 is a commercial office/entry mortise knob lockset with ANSI/BHMA A156.13 Series 1000 Grade 1 operational and security ratings, an 8 inch by 1-1/4 inch front and UL and cUL listing for fire doors. Choose the Sargent where a Grade 1 commercial and fire-rated specification governs.
15) We want keypad access on the same door instead of a keyed office/entry lock - what mortise options are there?
Electronic mortise locks that fit a mortise prep include the Alarm Lock DL3500CR Trilogy, a Grade 1 electronic mortise lock with 300 user codes and classroom function for 1-5/8 to 1-7/8 inch doors, and the Schlage CO-100 standalone electronic mortise lock, Grade 1 heavy duty with a keypad reader in privacy function for 1-3/4 inch doors. The Sargent 7855 is mechanical, keyed outside with a cylinder, so the trade is code management and audit versus purely key-based control.
16) The door does not need to lock at all - is there a simpler mortise lock than the Sargent 7855?
Yes. For a non-keyed opening, the Schlage PM010 is a Grade 1 passage latch mortise lock for 1-3/4 inch doors, and the Falcon MA101 is a Grade 1 heavy duty mortise passage lock in the MA Series that is field reversible and fire rated. Both drop the cylinder and locking function entirely, where the Sargent 7855 is a keyed office/entry lockset.
17) Can I use an Emtek 3102 Memphis mortise entrance lockset in place of the Sargent 7855?
No. The Emtek 3102 Memphis is a dummy function mortise entrance lockset, meaning it is fixed trim with no latch operation. The Sargent 7855 is a working office/entry mortise lockset with a one-piece anti-friction reversible latch and auxiliary deadlatch. A dummy only belongs on an inactive leaf.
18) Do I need a full lockset if I already have Sargent trim on the door?
No. The Sargent 7855 is offered as 7804 body only, as 7804-OB with LA keyway cylinder, O-rose and B-knob, and as 7804-OB-LC less cylinder with O-rose and B-knob. If you are reusing existing trim, the body only covers it. Comparable body-only options from other brands include the BEST 45H heavy duty mortise lock body in public entrance function with field reversible operation.
19) Our spec calls for a lever rather than a knob on a Grade 1 office mortise lock - what are the options?
The Sargent 7855 is configured as a knob lockset, with the 7804-OB using an O-rose and B-knob. For lever trim on an office function, the Hager 3850E in the 3800 Series is an office mortise lock with lever and escutcheon, non-keyed, with a 2-3/4 inch backset for 1-3/4 to 2-1/2 inch doors. Note that the 3850E is non-keyed while the Sargent 7855 is keyed outside.
20) We need access control wired to the mortise lock instead of a mechanical office/entry function - what fits?
For electrified mortise bodies, the BEST 45HW is a wired electromechanical heavy duty mortise lock with 12V/24V operation, the Command Access ML190 is a heavy duty motorized mortise lock with field selectable EL/EU operation on 24VDC in storeroom function, and the Schlage L9092EU with 03A trim is a heavy duty electric lock/unlock outside lever mortise lock, keyed outside with request to exit, 12/24VDC, for 1-3/4 inch doors. The Sargent 7855 is a mechanical lockset with no electrical connection.
21) What finish does the Sargent 7855 mortise lockset come in?
26D, satin chromium plated over nickel, across all three build options. That is the standard satin chrome commercial finish, so it sits alongside most existing closers, hinges and exit hardware in an office or institutional building without a visual mismatch.
22) Restrooms and offices are on the same corridor - what privacy mortise lock pairs with the Sargent 7855?
For the privacy doors, 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 in the 3800 Series is a Grade 1 privacy mortise lock with a 2-3/4 inch backset for 1-3/4 to 2 inch doors. Keep the Sargent 7855 office/entry on the offices, where the key retracts the latchbolt from outside and the inside trim always retracts it.
23) Is a mortise deadbolt like the Kaba Ilco 185 an alternative to the Sargent 7855?
It is an addition, not a replacement. The Kaba Ilco 185 Series is a deadbolt function mortise lock with no handing. The Sargent 7855 is a latching office/entry lockset with a one-piece anti-friction reversible latch and auxiliary deadlatch, so it is the operating lock on the door. If you need keypad-controlled bolt-only hardware, the Alarm Lock DL4500 is a Grade 1 electronic mortise deadbolt for 1-5/8 to 1-7/8 inch doors.
24) Behavioral health rooms on the same project need anti-ligature trim - what replaces the Sargent 7855 knob there?
Knob trim is not appropriate for those openings. The TownSteel MRX-L-01 is a Grade 1 heavy duty anti-ligature lever mortise lockset in passage function for 1-3/4 inch doors, and the MRX-A-01 is the ligature resistant arch trim version in satin stainless steel. Both are passage function, so use them where no locking is required, and keep the Sargent 7855 office/entry knob lockset on standard office doors.
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Can I return it if it doesn’t work for me?
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Does the Sargent 7855-26D come with a warranty?
Absolutely. The Sargent 7855-26D is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Sargent 7855-26D?
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