About this item
The Accentra AU5404LN is the Grade 1 entry function cylindrical lever lock with Augusta lever from Yale's 5400LN heavy-duty series. If you searched "ai55204", "ai59204", "ai58204", "ai79204", "ai10204", "yale augusta lever", or "cylindrical lockset" - this is the product. Accentra is the current brand name for Yale commercial hardware under ASSA ABLOY. The AU5404LN specifications carry forward directly from the Yale catalog.
AI55204, AI59204, AI58204, AI79204, AI10204: Distributor Catalog Reference Formats
These AI-prefix codes appear in commercial hardware distributor and industrial catalog systems - platforms like Grainger, Motion Industries, and similar industrial distributors - where the manufacturer's model number is internally referenced with a distributor-assigned prefix and catalog structure code. The AI prefix combined with a numeric string in these systems points to a specific configuration of the Accentra/Yale AU5404LN or a closely related 5400LN entry function model in a specific finish, keying, or cylinder configuration.
If your purchase order or facility spec sheet references one of these codes and you're confirming the right product - the AU5404LN is the standard Augusta lever entry lock in the 5400LN Grade 1 platform.
AU5404LN Model String Fully Decoded
Every character in the AU5404LN model number carries specific product information:
AU - Augusta lever design. The lever prefix identifies the specific lever geometry. AU = Augusta, the traditional curved institutional lever. MO = Monroe, the contemporary swept profile. PB = Pacific Beach, the straight minimal profile. All three are available on the 5404LN function.
5400LN - The product series. 5400 = heavy-duty Grade 1 cylindrical lever platform. The LN suffix designates lever-format (as opposed to the 5400 knob format without LN).
Function 04 - The entry/entrance function code within the 5400LN series. Function 04 in the 5400LN series is ANSI F82A - the specific entry function with push-button inside lever control.
Model prefix variants: M prefix (MAU5404LN) means master keyed - cylinder combinated to a master key system. B prefix (BAU5404LN) means SFIC prep - Small Format Interchangeable Core ready. ICLC suffix means LFIC Less Core - Large Format Interchangeable Core housing, less core.
ANSI F82A Entry Function: Push Button Operation Step by Step
The 5404LN function is ANSI F82A - a specific entry function that no competing product page decodes in plain language. Here is the complete operation:
Both levers retract the latchbolt freely when the lock is in the unlocked state - standard passage. When an authorized occupant inside pushes the button in the inside lever, the outside lever locks immediately - it cannot retract the latch from outside. The outside lever rotates freely (the free wheeling mechanism) without operating the lock. This is the quick-lock state for controlling building access from the inside.
The outside lever auto-releases from the locked state in two situations: the inside occupant turns the inside lever, or a key is inserted and rotated from outside. Both actions automatically return the outside lever to its free, operable state. No manual button reset is required from inside - the lock self-releases on the next authorized outside access.
This is ANSI F82A - different from ANSI F109 (the 5407LN function) which has a two-mode push-and-rotate button for auto-release and sustained lock. F82A has only one mode: push to lock, auto-release on key or inside lever turn.
Yale Augusta Lever: What It Looks Like and Where It's Specified
If you searched "yale augusta lever" - the Augusta (AU) is the traditional institutional lever. It has a gently curved arm that sweeps slightly downward from the rose - the classic commercial lever profile. It's the lever you recognize from office buildings, hospitals, schools, and government facilities across North America. The Augusta is understated and coordinates with virtually any hardware schedule. It reads as institutional rather than decorative, which is exactly the specification intent for high-traffic commercial interiors.
The Augusta lever is non-handed. It installs on both left-hand and right-hand doors without modification. It meets ADA lever gripping requirements - the curved profile allows operation without tight pinching, grasping, or twisting.
Cylinder Options: Full Configuration Matrix
Standard: 6-pin brass, Y1 (PARA) keyway, two nickel silver keys. The Y1 and PARA designations are the same keyway - the Yale PARA keyway referenced as Y1 in some catalog systems and E1R in others.
7-pin upgrade: More key differs for large master key systems - order as 7-pin option.
Master keying (M prefix - MAU5404LN): Cylinder combinated to a master key system. Both change key and master key operate the lock.
Construction master keying: Cylinder operates on a construction master during construction, then converted to permanent key system at project completion.
SFIC prep (B prefix - BAU5404LN): Small Format Interchangeable Core, less core. Housing accepts BEST-format SFIC cores.
LFIC less core (ICLC suffix - AU5404LN-ICLC): Large Format Interchangeable Core housing, less core. Accepts Yale/Schlage LFIC cores.
Less cylinder (LC suffix): Lock body only, no cylinder. Used when facility provides cylinder from their existing key system.
Extended Backset and Fire Latch Options
Standard backset is 2-3/4 inches. Optional 3-3/4-inch backset is available. Extension links provide backsets up to 19 inches - relevant for thick door frame applications, corridor wall openings, or specialty installations requiring unusually long latch projections.
For paired door applications on fire-rated openings, the optional 3/4-inch throw deadlocking fire latch replaces the standard 1/2-inch latch. The larger throw ensures the latch engages the strike across the door gap on a paired door assembly where the gap between leaves could allow the standard latch to miss strike engagement under fire conditions.
Specifications
Model: Accentra AU5404LN / Yale AU5404LN
Former Brand: Yale (now Accentra, ASSA ABLOY)
Series: 5400LN Grade 1 Heavy-Duty Cylindrical Lever
Function: ANSI F82A - entry; push button inside locks outside lever; auto-release on inside lever turn or outside key
Lever: Augusta (AU) - traditional curved institutional lever
Handing: Non-handed, ADA compliant
Chassis: Heavy-gauge cold-rolled steel, trivalent chrome plated
Backset: 2-3/4" standard; 3-3/4" optional; extensions to 19"
Door Thickness: 1-3/4" to 2" standard; 1-3/8" with spacer plates P/N 14-5401-6644
Latchbolt: 1/2" stainless steel deadlocking; optional 3/4" throw fire latch for door pairs
Cylinder Options: Standard 6-pin PARA (Y1), 7-pin, MK, CMK, SFIC (B prefix), LFIC (ICLC), Less Cylinder (LC)
Strike: ANSI curved lip, 4-7/8" x 1-1/4"
ANSI/BHMA: A156.2 Series 4000 Grade 1
ADA: Compliant - Augusta lever meets ANSI 117.1 and UFAS
UL/cUL: Fire label all functions up to 3 hours
ISO: 9001
Warranty: 7-year mechanical; lifetime lever sag and spring breakage
Finishes: 605, 606, 612, 613E, 625, 626
American Locksets has stocked Accentra and Yale 5400LN Grade 1 entry locks since 2001.
Trusted Since 2001
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