Marks USA MARLA318GJ LA318GJ C...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$649.94
$344.43
Marks USA Classroom Security Indicator Mortise Lockset, ANSI Strike, Steel Escutcheon 8-1/2in H x 2-3/4in W x 7/16"

Marks USA MARLA318GJ LA318GJ Classroom Security Indicator Mortise Lockset with ANSI Strike and Steel Escutcheon 8-1/2" H x 2-3/4" W x 7/16"

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Model: LA318GJ/32D-G3 LHR
$649.94
$344.43
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$649.94
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Marks USA LA318GJ Classroom Security Indicator Mortise Lockset with ANSI Strike and Steel Escutcheon 8-1/2" H x 2-3/4" W x 7/16"

The Marks USA LA318GJ is a heavy-duty Classroom Security Indicator Mortise Lockset from the Protector series, engineered for demanding commercial and institutional environments. Featuring a cast satin stainless steel escutcheon measuring 8-1/2" x 2-3/4" x 7/16" and designed for 1-3/4" door thickness, this lockset delivers the GJ double-cylinder classroom security function with a built-in occupancy indicator displaying unlocked (green Day-Glo) and lockdown (red Day-Glo) positions. The Protector series meets or exceeds all operational and security tests of ANSI A156.13-2002 for Series 1000, Grade 1, and is UL Listed with a 3-hour fire rating and ADA compliance.

Key Features

  • Escutcheon Dimensions: Cast satin stainless steel escutcheon measures 8-1/2" H x 2-3/4" W x 7/16" deep, providing a robust and professional trim profile for commercial doors.
  • Door Thickness Compatibility: Designed for 1-3/4" door thickness with available backsets of 2-1/2" and 2-3/4" to accommodate a range of door preparations.
  • Torque Override Protection: Integral "override guard" causes spindle failure when torque exceeding 550 foot lbs. is applied — the lockset remains locked and is fully operational once the spindle is replaced, preventing damage to the lock body.
  • Occupancy Indicator: Recessed indicator window in the escutcheon displays unlocked (green Day-Glo) and lockdown (red Day-Glo) positions for clear visual status at a glance.
  • Heavy-Duty Construction: Stainless steel bolts, latches, and independent lever support springs; cast screwless satin stainless steel lever handles secured with a hardened steel retainer ring and spring-loaded torque-sensitive 5/16" spindle.
  • Cylinder Specifications: Two 1-1/8", 6-pin solid brass cylinders with 2101 cam (interior) and 2105 cam (exterior), supplied with two keys; cams accommodate Corbin, Sargent, and Schlage cylinders. Outside cylinder rotates in both directions; inside cylinder rotates in one direction only.
  • ANSI Strike Included: 4-7/8" x 1-1/4" x 3/32" thick ANSI strike with 5/8" curved lip; also listed as 4-7/8" ASA Strike in specifications.
  • Reversible Handing: GJ function double-cylinder lock body is completely reversible without opening the lock case, simplifying installation and field adjustments.
  • Lifetime Mechanical Warranty: Backed by a lifetime mechanical warranty for long-term confidence in high-traffic commercial applications.

Certifications & Compliance

  • ANSI/BHMA Grade 1 — Meets or exceeds ANSI A156.13-2002, Series 1000
  • UL Listed — Underwriters Laboratories 3-Hour Fire Rating
  • BHMA Certified
  • ADA Compliant
  • Lifetime Mechanical Warranty

Technical Specifications

  • Standard Strike: 4-7/8" ASA Strike
  • Product Group: Mechanical Locks
  • Product Subgroup: Bored Locksets
  • Subcategory: Keypad Cylindrical Locks
  • ANSI/BHMA: ANSI/BHMA, UL Listed
  • Commercial/Residential: Commercial
  • Lock Type: Cylindrical
  • Series: Series LA318
  • Installation Category: Thru-Bolt
  • Department: Door Hardware

Typical Applications

  • K-12 Educational Facilities and Classrooms
  • Higher Education Campus Buildings
  • Healthcare and Institutional Facilities
  • Government and Municipal Buildings
  • Commercial Office Buildings
  • Multi-Tenant Residential and Dormitory Properties
  • Industrial and Secure Access Environments

Why Marks USA LA318GJ?

Marks USA Protector series mortise locksets are built to the highest commercial standards, featuring cast satin stainless steel construction, a hardened steel retainer ring, and a torque override preventer rated to withstand over 550 foot lbs. of applied torque. Certified to ANSI A156.13-2002 Grade 1, UL Listed with a 3-hour fire rating, and ADA compliant, the LA318GJ delivers the reliability and security that demanding institutional and commercial applications require.

Manufacturer Resources

Marks USA Product Catalog

Product Specs

Standard Strike:
4-7/8" ASA Strike
Latch Throw:
1/2"
Grade:
Grade 1
Product Group:
Mechanical Locks
Product Subgroup:
Bored Locksets
Product Type:
Mortise Locks
Subcategory:
Keypad Cylindrical Locks
ANSI/BHMA:
ANSI/BHMA, UL Listed
Commercial/Residential:
Commercial
Lock Type:
Cylindrical
Product Attribute:
Mortise Locks
Series:
LA318 Series
Door Thickness Range:
1-3/4"
Installation Category:
Thru-Bolt
Product Category:
Mortise Locks
Backset (Distance):
2-3/4"
Department:
Door Hardware

Marks USA LA318GJ/32D-G3 LHR – Frequently Asked Questions

1) How does the Marks LA318GJ lock down a classroom without the teacher stepping into the corridor?
Lockdown happens from inside the room with a key. The GJ function is a double cylinder classroom security arrangement: the inside cylinder throws the outside lever to locked, so nobody has to open the door to secure it. A recessed indicator window in the escutcheon shows green Day-Glo for unlocked and red Day-Glo for lockdown, so staff and responders can read the door status at a glance. The inside lever always retracts the latch for free egress. Outside cylinder turns both directions; the inside cylinder turns one direction only.
2) Do I have to order the Marks LA318GJ handed, and can it be flipped in the field?
You pick a hand when you order, either LHR (left hand reverse) or RHR (right hand reverse). Both are stocked in US26D satin chrome. That said, the GJ double cylinder lock body is fully reversible without opening the lock case, so if the wrong hand shows up on site or the opening changes, you can correct it at the door rather than sending it back.
3) Does the Marks LA318GJ come with cylinders and keys, or do I order it less cylinder for my keyway?
Both ways are available. Ordered standard, the lockset ships with two 1-1/8 inch six-pin solid brass cylinders and two keys, with a 2101 cam inside and a 2105 cam outside. If the building is keyed into an existing system, order the G3 option, which is less mortise cylinder, and supply your own. The cams accommodate Corbin, Sargent and Schlage cylinders, so a facility already keyed in one of those keyways can carry it through.
4) Is the Marks LA318GJ approved for a fire rated classroom door?
Yes. The Protector series LA318GJ is UL Listed with a 3 hour fire rating and is BHMA certified to ANSI A156.13-2002 Series 1000, Grade 1. It is also ADA compliant, which the lever trim carries. That combination is what a school or hospital spec normally calls for on a rated corridor opening.
5) Will the Marks LA318GJ latch into the strike frame prep I already have?
It ships with a 4-7/8 inch ANSI/ASA strike, 4-7/8 x 1-1/4 x 3/32 inches thick with a 5/8 inch curved lip, so a frame already prepped for standard ANSI strike geometry takes it without new frame work. Latch throw is 1/2 inch, so the strike box has to be a mortise strike, not a shallow cylindrical cutout.
6) My doors are 1-5/8 to 1-7/8 inch metal doors. Can I still use the Marks LA318GJ?
No. The LA318GJ is specified for 1-3/4 inch doors only, so a mixed range of 1-5/8 to 1-7/8 inch openings is outside what it covers. Alarm Lock's Trilogy classroom mortise locks are built for that range: the DL2700CR and the DL3500CR are both Grade 1 classroom function and specified for 1-5/8 to 1-7/8 inch doors.
7) What is the closest mechanical classroom mortise lock to the Marks USA LA318GJ if the indicator window is not required?
The Corbin Russwin ML2003 is a Grade 1 mortise classroom lockset in the ML2000 Series built for 1-3/4 inch doors, and the Cal-Royal NM8070 is a heavy duty Grade 1 classroom mortise lockset with an auxiliary deadlatch, also for 1-3/4 inch doors. Both are keyed classroom function mortise locks at the same Grade 1 level and the same 1-3/4 inch door thickness the LA318GJ is built for. The difference is at the trim: the LA318GJ carries the GJ double-cylinder classroom security function with a recessed occupancy indicator reading green for unlocked and red for lockdown, which neither the ML2003 nor the NM8070 carries.
8) Which classroom mortise lock should I use if I want lockdown from inside without a key?
The TownSteel FME-4000 Series is an electronic intruder classroom mortise lockset with RFID technology, Grade 1 heavy duty, for 1-3/4 inch doors, and the BEST 45HCA lock body carries an intruder function in a heavy duty mortise body. Both put lockdown on a control other than a keyed cylinder. The Marks USA LA318GJ takes a different approach: its GJ function uses two 1-1/8 inch 6-pin solid brass cylinders, the inside one rotating in one direction only, with the status shown in the escutcheon indicator window.
9) The opening is an office or a storeroom, not a classroom. What mortise lock takes the place of the Marks USA LA318GJ there?
Match the function to the opening. For an office or entrance door, the Cal-Royal NM8050 is a heavy duty Grade 1 entrance/office mortise lockset with an auxiliary deadlatch for 1-3/4 inch doors, and the Hager 3850E is a Grade 1 office mortise lock with lever and escutcheon on a 2-3/4 inch backset. For a storeroom, the Cal-Royal NM8080 is a heavy duty Grade 1 storeroom mortise lockset with an interchangeable core option, and the Accentra 8805FL is a Grade 1 storeroom mortise lock with an Arcadia lever in the 8800 Series. The Marks USA LA318GJ is a classroom security function lock, so those functions are the correct swap when the door is not a classroom.
10) What looks like a substitute for the Marks USA LA318GJ but will not secure the door?
Non-keyed and dummy mortise trim. The Schlage L0170 is a Grade 1 mortise non-keyed half dummy trim in the L Series for 1-3/4 inch doors, the Schlage PM010 is a Grade 1 non-keyed passage latch mortise lock, the Falcon MA101 is a Grade 1 heavy duty mortise passage lock, and the Emtek 3102 Memphis and 3104 Hamilton are dummy function mortise entrance locksets. They share the mortise pocket and the Grade 1 label in several cases but carry no cylinder and no locking function. The Marks USA LA318GJ is a keyed classroom security lock supplied with two 6-pin solid brass cylinders and two keys.
11) If I am standardizing a campus on one keyway, does the Marks USA LA318GJ work with cylinders from the same brands as the comparable mortise locks?
The Marks USA LA318GJ ships with two 1-1/8 inch 6-pin solid brass cylinders using a 2101 cam inside and a 2105 cam outside, and those cams accommodate Corbin, Sargent, and Schlage cylinders. It is also available in a G3 less mortise cylinder configuration so the facility can install its own. That covers keying alongside mortise locks such as the Corbin Russwin ML2003 classroom lockset in the ML2000 Series and the Sargent 7925 dormitory exit mortise lock in the 7900 Series. For an interchangeable core program instead, the Cal-Royal NM8080 storeroom mortise lockset offers an interchangeable core option.
12) What happens if someone puts a wrench on the lever of a Marks Protector lock?
The lever is built to give up before the lock body does. An integral override guard causes the spring loaded torque sensitive 5/16 inch spindle to fail once applied torque passes 550 foot pounds. The door stays locked, and once a replacement spindle goes in the lock is fully operational again. The lever is cast screwless satin stainless steel held by a hardened steel retainer ring, so there is no set screw to attack.
13) Should I use a key operated classroom security lock like the Marks LA318GJ or go electronic for a school lockdown?
A key operated indicator lock like the LA318GJ needs no power, no batteries and no network, and lockdown is one key turn from inside with a red or green indicator anyone can read. That is the low maintenance route across a lot of doors. If you need credential control, audit trail or remote lockdown, look at electronic classroom mortise locks instead: the TownSteel FME-2000 Series is a Grade 1 classroom mortise lockset with RFID, the FME-4000 Series is an electronic intruder classroom version with RFID, and the Alarm Lock DL3500CR is a Grade 1 Trilogy classroom mortise lock with 300 user codes. All three are keypad or credential driven, which means batteries and programming to maintain.
14) What else do I need to order to install the Marks LA318GJ on a classroom door?
The lockset itself is a complete package: escutcheon trim, levers, lock body, the 4-7/8 inch ANSI strike, and, unless you order the G3 less cylinder version, both cylinders and two keys. You specify hand (LHR or RHR) and cylinder option on the order. What the door has to bring is a 1-3/4 inch leaf with a mortise pocket at 2-3/4 inch backset and a frame with a standard 4-7/8 inch ANSI strike prep. Trim mounts thru-bolt, so the door needs the cross bolt holes through the stile.
15) Is a mortise deadbolt an equivalent to the Marks USA LA318GJ classroom security lock?
No, they do different jobs on the door. The Sargent 4874 is a double cylinder mortise deadbolt on a 2-3/4 inch backset and the Kaba Ilco 185 Series is a deadbolt function mortise lock with no handing; both throw a bolt and neither operates a latch through levers. The Marks USA LA318GJ is a complete lockset with cast screwless satin stainless steel lever handles, a 1/2 inch latch throw, and a 4-7/8 inch ASA strike, so a deadbolt alone would leave the door without latching hardware.
16) I need a mortise lock that ties into access control. What replaces the Marks USA LA318GJ on a card-reader or wired opening?
For a wired opening, the Schlage L9092EU 03A is a heavy duty electric lock/unlock outside lever mortise lock, keyed outside, with request to exit and 12/24VDC on a 1-3/4 inch door, and the BEST 45HW is a heavy duty wired electromechanical mortise lock running 12V or 24V. For credential-based access, the Schlage LEMD-GRW is a Grade 1 ENGAGE Series wireless mortise lock with a 125kHz proximity reader and a 3 hour fire rating, and the Dormakaba E-Plex E5086 is a Grade 1 entry/egress pushbutton and card mortise lock. The Marks USA LA318GJ is a fully mechanical lock with no wiring or credential reader, keyed on two cylinders.
17) Which mortise locks besides the Marks USA LA318GJ carry a 3 hour fire rating for a rated classroom opening?
Among comparable mortise locks, the Schlage LEMD-GRW ENGAGE Series wireless mortise lock is Grade 1 with a 3 hour fire rating, and the Schlage LEBMB-ADD mobile-enabled mortise lock is Grade 2 with a 3 hour fire rating for privacy, office, and apartment functions. The Marks USA LA318GJ is UL Listed with a 3-hour fire rating and ANSI/BHMA Grade 1, so on a 3 hour rated opening the LA318GJ and the LEMD-GRW both hold Grade 1 alongside the rating, while the LEBMB-ADD sits at Grade 2.
18) For a behavioral health or ligature-resistant opening, what mortise lockset takes the place of the Marks USA LA318GJ?
The TownSteel MRX-L-01 is a Grade 1 heavy duty stainless steel anti-ligature lever mortise lockset in passage function for 1-3/4 inch doors, and the MRX-A-01 is a satin stainless steel ligature resistant arch trim mortise lockset, also Grade 1 heavy duty passage for 1-3/4 inch doors. Both match the LA318GJ at Grade 1 on a 1-3/4 inch door but are passage function, so the door will not lock. The Marks USA LA318GJ uses cast satin stainless steel lever handles and carries a keyed classroom security function.
19) Can I order a mortise lock body alone rather than the complete Marks USA LA318GJ lockset?
Yes, several comparable products are bodies rather than complete sets. The BEST 45H Series is a heavy duty mortise lock body in public entrance function with field reversible operation, and the Baldwin 6310 is an entry/storeroom mortise lock body on a 2-1/2 inch backset for doors 1-3/8 inch and over. The Marks USA LA318GJ ships as a complete set with the cast stainless steel escutcheon, levers, two cylinders and two keys, and the 4-7/8 inch ANSI strike, and its GJ lock body is reversible without opening the lock case.
20) Which classroom mortise lock is handed and which one avoids a handing decision at order time?
The Marks USA LA318GJ is ordered by hand, in LHR left hand reverse and RHR right hand reverse, though the GJ lock body itself is completely reversible without opening the lock case. Among comparables, the BEST 45H Series mortise lock body is field reversible and the Falcon MA101 is a Grade 1 heavy duty mortise passage lock with field reversible operation; the Schlage LEMD-GRW ENGAGE wireless mortise lock is specified right hand, and the Baldwin 6310190RRLS is a right hand reverse entry/storeroom mortise lock.
21) Will an aluminum storefront mortise lock work where the Marks USA LA318GJ is specified?
They suit different doors. The Alarm Lock DL1300NW Trilogy Networx is a wireless electronic mortise lock with keypad built for Adams Rite deadlatches, the Dormakaba E-Plex 2066 is an electronic pushbutton keyless mortise lock for wide stile doors, and the Kaba Ilco BR Series is a glass door bottom rail lock. The Marks USA LA318GJ is built for a 1-3/4 inch door with an 8-1/2 inch by 2-3/4 inch by 7/16 inch cast escutcheon and a 4-7/8 inch ASA strike, which is a standard commercial swing door preparation rather than a narrow or wide stile aluminum frame.
22) What finish does the Marks LA318GJ come in, and will it match the other stainless trim in the building?
US26D satin chrome is the finish offered, on every handing and cylinder combination. The escutcheon and levers are cast satin stainless steel, which reads as the standard institutional satin trim and sits alongside typical 626/626-family hardware on adjacent openings without looking out of place.
How fast can I get the Marks USA LA318GJ/32D-G3 LHR delivered?
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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 Marks USA LA318GJ/32D-G3 LHR come with a warranty?
Absolutely. The Marks USA LA318GJ/32D-G3 LHR 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 Marks USA LA318GJ/32D-G3 LHR?
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