Accentra 4791LN Augusta Grade ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$925.00
$382.03
Yale Commercial Yale 4791LN Augusta Grade 1 Fail Secure Electrified Cylindrical Lever Lock YAL-AU4791LN

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

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Model: YAL-AU-4791LN-626
From the 4700 Series Collection
Selected Finish is

In Stock (leaves warehouse same day if ordered before 3pm ET)

$925.00
$382.03
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Accentra 4791LN Augusta Grade 1 Fail Secure Electrified Cylindrical Lever Lock

Professional Grade 1 Cylindrical Lock Solution

The Accentra 4791LN Augusta cylindrical lever lock delivers Grade 1 performance for demanding commercial applications. This electrified cylindrical lock features fail secure operation, adjustable door thickness from 1-3/8" to 1-3/4", and 2-3/4" standard backset with 1/2" stainless steel latchbolt throw. ANSI/BHMA Grade 1 certified and UL fire-rated up to 3 hours, this lock provides reliable security with heavy-gauge steel, die-cast, zinc-plated mechanism construction.

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. Confirm voltage per specifications and current capacity before proceeding.
  2. Disconnect power supply before beginning installation. Follow all applicable electrical codes and safety procedures.
  3. Mount the unit in the specified location ensuring adequate clearance for wiring access, ventilation, and future service requirements.
  4. Route and connect wiring according to manufacturer wiring diagrams. Use appropriate wire gauge and connectors for the application.
  5. Configure operational settings including fail-secure operation per application requirements.
  6. Restore power and test all functions including normal operation, alarm/alert functions, and integration with connected systems.
  7. Complete final inspection and document settings. Refer to manufacturer documentation for complete wiring diagrams, programming instructions, 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 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 5-year mechanical warranty for added confidence and protection. Engineered for demanding commercial applications where dependable performance and fire safety 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:
Augusta Lever
Product Category:
Mechanical Locks
Department:
Door Hardware

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

1) What does fail secure mean on the Accentra 4791LN Augusta electrified lever lock, and what happens in a power outage?
Fail secure means the outside lever stays locked when power is removed. On the 4791LN Augusta, cutting power to the lock leaves the door secured from the outside, and the inside lever always retracts the latch for free egress. Use fail secure where you want the opening to stay locked if the building loses power, such as a stairwell or storeroom on an access control system. If your code official requires the opening to release on power loss, you need a fail safe device instead, like the Corbin Russwin CL33903 electrified cylindrical lever.
2) Will the Accentra 4791LN fit a 1-3/8 inch door, or does it need a 1-3/4 inch door?
Both work. The 4700LN version, which is what the 4791LN is, adjusts from 1-3/8 inch to 1-3/4 inch door thickness. If your door is thicker than that, up to 2 inches, you need the 4700 (non-LN) body instead, which covers 1-3/4 inch to 2 inch.
3) What backset and latch throw does the Accentra 4791LN Augusta use, and will it drop into an existing ANSI strike prep?
Standard 2-3/4 inch backset with a 1/2 inch stainless steel latchbolt throw, and it ships with an ANSI strike measuring 4-7/8 x 1-1/4 inches with a 1-1/4 inch lip to center. If the frame already carries an ANSI 4-7/8 inch strike prep on a 2-3/4 inch backset door, it lands in the existing prep. An optional T-strike is available to order on the 4700LN if your frame is prepped for that instead.
4) Is the Accentra 4791LN lever lock fire rated for a labeled door?
Yes. The 4791LN Augusta is UL-cUL fire rated up to 3 hours and certified to ANSI/BHMA A156.2, Series 4000, Grade 1. It also carries 4700LN windstorm certification, though you should confirm against your local code for storm-rated openings.
5) What cylinder and keying comes with the Accentra 4791LN, and can I get it in 7-pin?
It comes standard with a brass 6-pin keyed-random cylinder and two keys. Seven-pin is not available on this lock, so if your facility is standardized on a 7-pin master key system, this body will not join that system as supplied.
6) What is the closest electrified cylindrical lever lock to the Accentra 4791LN Augusta from another brand?
The Corbin Russwin CL33903 is the nearest peer: a Grade 1 electrified cylindrical lever lock available in a 12VAC/DC version. The key difference in operation is failure mode - the Accentra 4791LN is fail secure, meaning the lock stays locked when power is removed, while the CL33903 is fail safe, unlocking on loss of power. The CL33903 also lists a door thickness range of 1-3/4 inch to 2 inch, whereas the 4791LN adjusts from 1-3/8 inch to 1-3/4 inch, so on a standard 1-3/4 inch commercial door either fits and on a 1-3/8 inch door the Accentra is the one that covers it.
7) If the door does not need to be electrified, what Grade 1 cylindrical lever lock can I use instead of the Accentra 4791LN?
The Accentra 4791LN Augusta is an electrified lock and needs a power supply and wire transfer to the door. For a mechanical opening, Grade 1 cylindrical lever options include the Dexter C1000 classroom lock with a clutching lever, the Dexter C1000 classroom security version, the Falcon T101 heavy duty passage lever with pressure release, and the Falcon K101 Grade 1 fire-rated passage lock, which lists a 1-3/8 inch to 2-1/4 inch door thickness range. Pick by function: classroom and classroom security are keyed, the passage versions latch only and do not lock.
8) What looks like a substitute for the Accentra 4791LN but will not work on an electrified opening?
Trim and non-keyed sets are the common mix-up. The BEST 9K 1DT single dummy trim is a Grade 1 non-keyed dummy - it is a lever on a rose with no latch at all - and the Corbin Russwin 585F715 is a Grade 1 lock lever for an ED8000 pushpad exit device, not a standalone lockset. Passage sets such as the Corbin Russwin CL3110 Grade 1 vandal resistant passage lever and the Dexter C1000 Grade 1 passage lever latch the door but never lock it. None of these accept a power connection, while the 4791LN Augusta is an electrified fail secure lock.
9) The Accentra 4791LN Augusta only adjusts to 1-3/4 inch - what cylindrical lever lock fits a 2 inch thick door?
The 4700LN version of the Augusta adjusts from 1-3/8 inch to 1-3/4 inch, so for a thicker leaf look at peers that list the wider range: the Falcon K101 Grade 1 fire-rated passage lock covers 1-3/8 inch to 2-1/4 inch, the Dexter C1000 asylum function covers 1-3/8 inch to 2 inch, and the Corbin Russwin CL3110 Grade 1 passage and the Corbin Russwin CL33903 electrified Grade 1 lever both cover 1-3/4 inch to 2 inch. Note that the CL33903 is fail safe rather than fail secure.
10) Does the Accentra 4791LN need to be handed when I order it?
No handing to specify. The 4791LN Augusta is non-handed and reversible, so one lock covers left and right hand openings. That makes it easier to stock a single part across a building instead of splitting inventory by hand.
11) What finishes does the Accentra 4791LN Augusta lever come in?
Eight choices: 605 bright brass, 606 satin brass, 612 satin bronze, 613E dark oxidized satin bronze equivalent, 625 bright chrome, 626 satin chrome, BSP black suede powder coat, and WSP white suede powder coat. Worth knowing for a fleet: the 4700 (thick door) body is offered only in 630 satin stainless, so a mixed-thickness building will not finish-match across both bodies.
12) What front does the Accentra 4791LN latch use, and can I get a flat front for a square-edge door?
A 2-1/4 x 1-1/8 inch beveled front is standard. Flat fronts are available to order, which is what you want on a square-edge door or a frame prep cut for a flat face.
13) I need matching non-electrified levers on the rest of the doors. What should I pair with the 4791LN?
The 4791LN is the electrified member of the 4700LN cylindrical family, so the straightforward move is to stay in the 4700LN series for the mechanical openings and specify the same Augusta lever and finish. That keeps lever shape, rose, 2-3/4 inch backset, and ANSI strike prep consistent across the building. If you only need a Grade 1 mechanical passage or classroom lever and lever style does not have to match, the Dexter C1000 Series covers passage, classroom, classroom security and asylum functions at Grade 1.
14) Is there a lower-cost alternative to the Accentra 4791LN for a lighter-traffic commercial door?
If the opening does not require Grade 1 or electrification, Grade 2 cylindrical lever locks cover moderate traffic. The Hager 2525 is a Grade 2 commercial cylindrical entry lever lock with a 1-3/8 inch to 2 inch door thickness range, the Hager 2580 is a Grade 2 storeroom lever in the same range, and the Cal-Royal AG05 is a Grade 2 storeroom leverset with a deadlocking latchbolt for 1-3/8 inch to 1-3/4 inch doors. All three are key-operated only; none accept an access control signal the way the electrified 4791LN Augusta does.
15) Can a keypad leverset replace the Accentra 4791LN for controlled access?
Only if you are not tying the door into a central access control system. The 4791LN Augusta is an electrified Grade 1 cylindrical lock wired to a power supply so a card reader or release button controls it. A standalone keypad lever such as the Delaney LP250 electronic keypad leverlock, a Lockey 1150 mechanical keypad lever set with double combination for 1-1/8 inch to 2 inch doors, or the Lockey 2835 mechanical pushbutton keyless lever for 1-3/16 inch to 2 inch doors grants access by code at the door with no wiring, but it cannot be released remotely.
16) For a patient room or behavioral health door, is the Accentra 4791LN the right cylindrical lock?
The 4791LN Augusta is a fail secure electrified lever lock, suited to doors controlled by a card reader or release station. Where the requirement is a mechanical asylum or institution function with a key on both sides, the Dexter C1000 asylum F87 is a Grade 1 cylindrical lock for 1-3/8 inch to 2 inch doors, and the Arrow MK33-BD-CS is an asylum function cylindrical lock with a ball knob and a conventional Schlage C keyway cylinder.
17) What is the guardbolt on the Accentra 4791LN for?
The guardbolt deadlocks the latchbolt as soon as the door closes, which blocks someone from shimming or carding the latch back. It is standard on all locking functions in the 4700 series, so you get it on the 4791LN without specifying anything.
18) Is the Accentra 4791LN heavy enough for a high traffic commercial opening?
It is built for it. Grade 1 to ANSI/BHMA A156.2 Series 4000 is the top commercial duty rating for bored locks, and the chassis is heavy-gauge steel with a die-cast, zinc-plated and chromated mechanism. Typical placements are office buildings, schools, healthcare, retail, warehouses, multi-tenant residential and municipal buildings. For a light-duty interior opening in a residential setting, a Grade 2 or Grade 3 lever such as the Hager 2510 is the more usual spec.
19) I have a residential-style interior door - is the Accentra 4791LN Augusta overkill?
For an interior residential door, yes. The 4791LN Augusta is a commercial Grade 1 electrified cylindrical lock built for office, school, healthcare and multi-tenant openings. For interior hall, closet, bedroom and bath doors, Grade 3 sets such as the Kwikset 200BRNL Breton passage lever and the Kwikset 300BRNL Breton privacy lever, both rated for 1-3/8 inch to 1-3/4 inch doors, or the Callan Asheville Grade 3 passage leverset, are the intended class of product.
How fast can I get the Accentra YAL-AU-4791LN-626 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Accentra YAL-AU-4791LN-626 come with a warranty?
Absolutely. The Accentra YAL-AU-4791LN-626 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 Accentra YAL-AU-4791LN-626?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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