Accentra 4791LN Monroe Grade 1...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$925.00
$716.21
Yale Commercial Yale 4791LN Monroe Grade 1 Fail Secure Electrified Cylindrical Lever Lock YAL-MO4791LN

Accentra 4791LN Monroe Grade 1 Fail Secure Electrified Cylindrical Lever Lock

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Model: YAL-MO-4791LN-626
From the 4700 Series Collection
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$925.00
$716.21
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Accentra 4791LN Monroe Grade 1 Fail Secure Electrified Cylindrical Lever Lock

Professional Grade 1 Cylindrical Lock Solution

The Accentra 4791LN Monroe cylindrical lever lock delivers Grade 1 performance with fail secure electrified operation for demanding commercial applications. This heavy-duty lock features adjustable door thickness from 1-3/8" to 1-3/4", 2-3/4" standard backset, and 1/2" stainless steel latchbolt throw. ANSI/BHMA Grade 1 certified and UL fire-rated up to 3 hours, ensuring reliable security and code compliance.

Professional Features & Benefits

  • ANSI/BHMA: A156.2, Series 4000 Grade 1
  • UL-cUL: UL-cUL fire-rated up to 3 hours
  • Windstorm: 4700LN Certified (refer to local codes)
  • Mechanism: Heavy-gauge steel, die-cast, zinc-plated, chromated
  • Backset: 2-3/4" standard
  • Latchbolt: 1/2" stainless steel throw standard
  • Guardbolt: Deadlocks latchbolt when door is closed; standard on all locking functions
  • Door Thickness: 4700LN adjustable from 1-3/8" to 1-3/4". 4700 adjustable from 1-3/4" to 2"
  • Fronts: 2-1/4" x 1-1/8" beveled standard; flat fronts available to order
  • Cylinders: Brass, 6-pin, keyed-random cylinder with two keys furnished standard, 7-pin not available.
  • Reversibility: Non-handed
  • Strikes: ANSI strike 4-7/8" x 1-1/4" x 1-1/4" lip to center supplied standard. Optional T-strike available to order for 4700LN.
  • Finishes: 4700LN available in 7 finishes, 4700 available in satin stainless steel (630) only.
  • Warranty: 5-year mechanical

Installation & Operation

  1. Verify electrical requirements match available power supply and confirm fail secure operation requirements before proceeding with installation.
  2. Disconnect power supply before beginning installation. Follow all applicable electrical codes and safety procedures.
  3. Use manufacturer-provided templates to mark mounting hole locations accurately on door. Prepare door by drilling required 2-1/8" bore hole and edge bore for latch.
  4. Route and connect wiring according to manufacturer wiring diagrams for electrified operation. Use appropriate wire gauge and connectors for the application.
  5. Install lock mechanism ensuring proper alignment with door thickness adjustment from 1-3/8" to 1-3/4" and verify 2-3/4" backset positioning.
  6. Configure fail secure operational settings per application security requirements and test electrified functions.
  7. Restore power and test all functions including normal operation, electrified locking/unlocking, and integration with access control systems. Complete final inspection and document settings.

Professional Applications

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

Why Choose Accentra Quality?

Accentra cylindrical lever locks deliver professional-grade reliability with heavy-gauge steel construction and Grade 1 certification for demanding commercial applications. UL fire-rated up to 3 hours with comprehensive 5-year mechanical warranty coverage. Engineered for consistent performance where dependable security and code compliance are essential.

Product Specs

Series:
4700 Series
Subcategory:
Cylindrical
Grade:
Grade 1
Product Group:
Mechanical Locks
Product Subgroup:
Bored Locksets
Product Type:
Leversets
Commercial/Residential:
Commercial
Electronic:
Yes
Lock Type:
Cylindrical
Handle Type:
Lever
Product Attribute:
Cylindrical Locks
Product Model:
YAL-4791LN
Collection:
4700 Series
Lever Design Name:
Monroe Lever
Product Category:
Mechanical Locks
Department:
Door Hardware

Accentra YAL-MO-4791LN-626 – Frequently Asked Questions

1) Will the Accentra 4791LN Monroe lever lock fit a 1-3/4 inch commercial door?
Yes. The 4791LN is a 4700LN lock, and the LN prep adjusts from 1-3/8 to 1-3/4 inches, so a standard 1-3/4 inch commercial door is right in the middle of its range. If your door is thicker, up to 2 inches, the LN version is the wrong one, that range belongs to the plain 4700 body instead. Door prep is a 2-1/8 inch bore with an edge bore for the latch, on a 2-3/4 inch backset.
2) What does fail secure mean on the 4791LN electrified lever lock, and what happens when the power drops?
Fail secure means the outside lever stays locked when power is removed. Energize the lock to release the outside lever for entry; cut power, whether by design or by an outage, and the opening goes back to locked. The inside lever always retracts the latch for free egress. That is the configuration you want on a tenant suite, a stairwell entry, or a storeroom where losing power should not throw the door open. If your code official wants the opening to unlock on a fire alarm or power loss, you need a fail safe version instead, not this one.
3) Is the Accentra 4791LN fire rated for a labeled door?
UL-cUL fire rated up to 3 hours, and certified to ANSI/BHMA A156.2 Series 4000 Grade 1. The 4700LN also carries a Windstorm certification, though windstorm assemblies are governed locally so the AHJ has the final word on that one. For a hospital corridor or a school stair door carrying a 3 hour label, the lock body itself is not the limiting factor.
4) Will the 4791LN latch into the strike already in my frame?
It ships with a standard ANSI strike, 4-7/8 by 1-1/4 with a 1-1/4 inch lip to center, and the latchbolt throws 1/2 inch in stainless steel. If your frame is already prepped for an ANSI 4-7/8 strike, which is what most hollow metal commercial frames use, the supplied strike drops straight in. For an aluminum or narrow frame prepped for a T-strike, an optional T-strike is available to order on the 4700LN. Note the 1/2 inch throw: it is a cylindrical latch, not a deadbolt, so gap and alignment matter more than they would on a mortise lock.
5) What cylinder and keying comes with the Accentra 4791LN, and can I get it 7-pin?
A brass 6-pin keyed-random cylinder with two keys is furnished standard. 7-pin is not available on this lock, so if your facility is on a 7-pin master system, this is the wrong body to specify. Keyed-random also means it arrives on its own key out of the box, so a locksmith standardizing a property will want to plan on rekeying to the house system.
6) What else could I buy instead of the Accentra 4791LN electrified cylindrical lever lock?
The closest cross-brand equivalent we carry is the Corbin Russwin CL33903, a Grade 1 electrified cylindrical lever, but note it is a fail safe lock and fits 1-3/4 to 2 inch doors, so it is the opposite power behavior and a thicker door range than the 4791LN. If your opening is 1-3/8 to 1-3/4 inches and you need it locked on power loss, stay with the 4791LN. If you need the door to release when power drops, and the door is 1-3/4 to 2 inches, the CL33903 is the one to look at.
7) My doors are 2 inches thick. Can I still use the Accentra 4700 Monroe lever?
Not the LN version. The 4700LN adjusts 1-3/8 to 1-3/4 inches and stops there. The plain 4700 body covers 1-3/4 to 2 inches, but it comes in satin stainless steel 630 only, so a 2 inch door and a brass or black finish will not go together in this family. Other Grade 1 options we carry that reach 2 inches include the Corbin Russwin CL3110 at 1-3/4 to 2 inches and the Dexter C1000 asylum function at 1-3/8 to 2 inches.
8) What is the closest equivalent to the Accentra 4791LN Monroe electrified cylindrical lever lock from another manufacturer?
The Corbin Russwin CL33903 is the nearest peer: a Grade 1 electrified cylindrical lever lock offered in a 12VAC/DC version. The difference that decides the job is the mode of operation and the door. The Accentra 4791LN Monroe is fail secure, meaning the outside lever stays locked when power is lost, and it fits doors 1-3/8 inch to 1-3/4 inch thick. The CL33903 is a fail safe lever, which unlocks on power loss, and it lists a 1-3/4 inch to 2 inch door thickness range. Match the mode to the code requirement for the opening first - egress and fire door strategies dictate fail safe versus fail secure - then check that the door thickness falls in range.
9) Is a keypad lever lock a substitute for the Accentra 4791LN Monroe electrified lock?
They solve different problems. The Accentra 4791LN Monroe is a fail secure electrified Grade 1 lever wired to a power supply and intended to be released by an access control system. A keypad lever such as the Emtek Classic Keypad Leverset or the Delaney LP250 electronic keypad leverlock, which is Grade 2, credentials at the door itself with a code - there is no wiring back to a panel and no central control over who gets in when. The mechanical keypad Lockey 2835 is likewise standalone, uses a pushbutton code with no power at all, and is a passage function that fits doors 1-3/16 inch to 2 inch. Choose the 4791LN when the opening has to answer to an access control system; choose a keypad when the door stands alone.
10) Does the Accentra 4791LN Monroe lever fit an exit device, or do I need different trim?
The Accentra 4791LN Monroe is a bored cylindrical lock - it installs in a 2-1/8 inch bore with an edge bore for the latch on a 2-3/4 inch backset. It is not exit device trim. For a pushpad exit device, the lever trim is a separate part: the Corbin Russwin 585F715 is a Grade 1 lock lever for the ED8000 pushpad exit device, and the Imperial USA ED-EL500HD is a heavy duty escutcheon lever trim with entry function. Trim mounts to the device, not to a cylindrical bore, so the two are not interchangeable on the same door prep.
11) Do I have to specify handing when I order the Accentra 4791LN Monroe lever?
No. The 4700LN is non-handed, so one part number covers left and right hand doors. That is worth knowing if you are stocking spares across a building: one lock on the shelf covers every opening rather than two. It also means a field reversal is not a special order.
12) What is a guardbolt on a cylindrical lock and does the 4791LN have one?
The guardbolt deadlocks the latchbolt once the door is closed, which is what stops someone shimming the latch with a card. It is standard on all locking functions in the 4700 line, including the 4791LN. If you are securing an exterior or tenant door with a cylindrical lock rather than a mortise, this is the feature that makes that acceptable.
13) Should I use an electrified cylindrical lever lock or a mortise lock for access control?
An electrified cylindrical lever like the 4791LN goes into a standard 2-1/8 inch bore with a 2-3/4 inch backset, so it retrofits an opening that already has a bored lock in it. That is the cheaper, faster path when you are adding a card reader to existing doors. A mortise lock needs a pocket cut into the door edge, which on an existing hollow metal door usually means a new door. Go mortise when you need higher security, a deadbolt, or a function a bored lock cannot do. Go cylindrical when the prep is already there and the opening is a normal commercial door 1-3/8 to 1-3/4 inches thick.
14) I only need a Grade 1 mechanical lever, not an electrified one. What should I order instead?
Skip the 4791LN if there is no access control on the opening, the electrification is cost you will not use. For a Grade 1 mechanical lever we carry the Dexter C1000 Series in entry/office, classroom, and classroom security functions, all fitting 1-3/8 to 1-3/4 inch doors, the same range as the 4791LN. The Falcon K101 is a Grade 1 fire rated passage lever with a wider 1-3/8 to 2-1/4 inch range if your doors vary in thickness. For a non-latching pull side on a pair, the BEST 9K Series 1DT is a Grade 1 dummy trim.
15) Is the Accentra 4791LN heavy duty enough for a high traffic entrance?
It is built for it. The mechanism is heavy-gauge steel, die-cast, zinc-plated and chromated, and the lock is certified ANSI/BHMA A156.2 Series 4000 Grade 1, the highest cycle and strength tier in that standard. Grade 1 is what a school corridor, hospital, or municipal building spec normally calls out. Most of the lever locks in the general market are Grade 2 or Grade 3, which are fine for interior and residential traffic but not for a main entrance carrying a few hundred cycles a day.
16) What do I need besides the lock itself to get the 4791LN working on an access control system?
The lock is the locking device, not the whole system. Plan on a power supply matched to the lock's electrical requirements, a power transfer at the hinge or an electric hinge to get wire from the frame into the door, and the reader plus controller on the access side. Door prep is a 2-1/8 inch bore, an edge bore for the latch, and a wire path through the door. Verify the power supply against the lock's electrical requirements before you cut anything, and pull power before you start the install.
17) If the opening does not need access control, what mechanical lever lock replaces the Accentra 4791LN Monroe?
Drop the electrified requirement and the choice opens to standard Grade 1 cylindrical levers. For a keyed opening, the Dexter C1000 Series Entry/Office lever is Grade 1 and covers 1-3/8 inch to 1-3/4 inch doors, the same thickness range the 4791LN Monroe adjusts through. For a classroom opening, the C1000 Classroom lever is Grade 1 over that same range with a clutching, keyed design. Both are mechanical only - no wiring, no power supply, and no fail secure behavior to specify - so the door prep is the bore and edge bore without wire routing.
18) What is a Grade 2 alternative to the Accentra 4791LN Monroe for a lighter-traffic door?
The Accentra 4791LN Monroe is ANSI/BHMA A156.2 Series 4000 Grade 1 with an electrified fail secure function. Where the traffic does not call for Grade 1 and no access control is involved, the Hager 2580 storeroom lever is Grade 2 and fits 1-3/8 inch to 2 inch doors, and the Cal-Royal AG05 storeroom lever is Grade 2 with a deadlocking latchbolt over 1-3/8 inch to 1-3/4 inch. Both are keyed mechanical storeroom function, so the outside lever is always locked and the key retracts the latch - no wiring and no power supply.
19) What do I use on the doors that only need to latch, alongside the Accentra 4791LN Monroe on the controlled openings?
A common pattern is one electrified lock on the controlled entry and non-keyed levers on the interior doors behind it. The Accentra 4791LN Monroe covers the controlled opening as a Grade 1 fail secure electrified lever. For the doors behind it, the Falcon K101 is a Grade 1 heavy duty passage lever, fire rated, with non-handed levers and a wide 1-3/8 inch to 2-1/4 inch door thickness range; the Design Hardware X75 is a Grade 1 passage lever for 1-3/4 inch doors; and the Corbin Russwin CL3110 is a Grade 1 vandal resistant passage/closet lever, fire rated, for 1-3/4 inch to 2 inch doors. All three are non-keyed, so they latch but do not lock.
20) Can I use a residential grade lever instead of the Accentra 4791LN Monroe in a commercial building?
The Accentra 4791LN Monroe is a commercial Grade 1 lock certified to ANSI/BHMA A156.2 Series 4000 and UL fire rated up to 3 hours. Grade 3 levers such as the Kwikset 200BRNL Breton passage, the Kwikset 300BRNL Breton privacy, the Cal-Royal AUS00 entrance/office lever, and the Master Lock BC Series keyed entry lever sit at a different certification level entirely. Where a specification or an inspection calls for Grade 1 and a fire rating, a Grade 3 lever does not answer it. Grade 3 levers suit residential-style interior doors where no commercial grade requirement applies.
21) What Grade 1 lever should I use for a patient room or holding room instead of the Accentra 4791LN Monroe?
Asylum function is the one to look at for rooms that must be keyed from both sides with no free egress by lever. The Dexter C1000 Series asylum lever is Grade 1 with an F87 asylum function and fits 1-3/8 inch to 2 inch doors, covering a wider range than the 1-3/8 inch to 1-3/4 inch the Accentra 4791LN Monroe adjusts through. The 4791LN Monroe is the choice when the room needs to be released by an access control system rather than by key on both faces.
22) Is the Accentra 4791LN Monroe the same as a knob lock of the same grade?
No - the Monroe is a lever, and lever operation is what ADA-driven specifications typically call for on commercial openings. Knob-operated cylindrical locks such as the Arrow HK11 turn-pushbutton entrance ball knob, the Arrow MK02-TA Tudor knob privacy, and the Arrow MK33 asylum ball knob use the same cylindrical bore family but require grasping and twisting rather than a downward push. If a knob is being replaced with a lever to meet an accessibility requirement, the lever is the part that satisfies it.
23) What finishes does the Accentra 4700LN Monroe lever come in?
Eight choices on the 4791LN: 605 bright brass, 606 satin brass, 612 satin bronze, 613E dark oxidized satin bronze equivalent, 625 bright chrome, 626 satin chrome, plus BSP black suede powder coat and WSP white suede powder coat. If you are matching existing openings in a building, 626 satin chrome is the usual commercial default. The powder coat options are the ones to look at when the spec calls for black or white hardware rather than a plated finish.
24) What front does the Accentra 4700LN latch come with, and can I get a flat front?
A 2-1/4 by 1-1/8 beveled front is standard. Flat fronts are available to order, which is what you need on a door edge that is not beveled or where the existing latch mortise is cut square. Check what is in the door before you order, swapping a front after the fact means a second trip.
25) I need a lever that matches the Accentra 4791LN Monroe on an adjacent door that takes no hardware function - what pairs with it?
For an inactive leaf or a false door beside a controlled opening, a dummy trim is the right part - it mounts a lever with no latch and no function at all. The BEST 9K Series 1DT single dummy trim is a Grade 1 heavy duty non-keyed cylindrical lever trim, matching the Grade 1 level the Accentra 4791LN Monroe carries; the BEST 7KC Series 1DT is the Grade 2 medium duty equivalent. Note these are the trim only - a dummy will not latch the door, so it suits inactive leaves and pull-only applications, not any opening that has to stay closed on its own.
26) Which lever locks have the widest door thickness range if I am standardizing across doors of different thicknesses?
The Accentra 4791LN Monroe adjusts from 1-3/8 inch to 1-3/4 inch. If a single model has to cover thicker doors in the same building, the Falcon K101 Grade 1 heavy duty passage lever spans 1-3/8 inch to 2-1/4 inch, the Dexter C1000 asylum lever covers 1-3/8 inch to 2 inch at Grade 1, and the Lockey 1150 heavy duty keypad lever set covers 1-1/8 inch to 2 inch. Note that only the Dexter is a keyed mechanical lock of the three - the Falcon is passage and the Lockey is a keypad set - so match function before thickness.
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Does the Accentra YAL-MO-4791LN-626 come with a warranty?
Absolutely. The Accentra YAL-MO-4791LN-626 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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