TownSteel MSS Series Heavy Dut...
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TownSteel TownSteel MSS Series Entrance/Apartment Function - Heavy Duty Sectional Mortise Lock , Single Cylinder TWS-MSS-20

TownSteel MSS Series Heavy Duty Sectional Mortise Lock - ANSI Grade 1, Single Cylinder Entrance/Apartment Function

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Model: MSS-R-T-20-626
$544.00
$380.32
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TownSteel MSS Series Heavy Duty Sectional Mortise Lock — ANSI Grade 1, Single Cylinder

The TownSteel MSS Series Heavy Duty Sectional Mortise Lock is an ANSI Grade 1 commercial-grade lock engineered for single opening, stand-alone entrance, apartment, and dormitory applications, while remaining ready for integration into sophisticated access control systems. Featuring a 2-3/4" backset, a 3/4" projection stainless steel split anti-friction latch bolt, and a durable plated/stainless steel ANSI strike, this single cylinder mortise lock delivers dependable security for high-traffic commercial doors. Forged brass/cast zinc lever components, a 1-1/4" x 8" stainless steel faceplate, and a 10-9/16" x 2-3/8" x 9/32" solid brass escutcheon combine heavy-duty construction with a refined finished appearance.

Key Features

  • Precision Backset: 2-3/4" backset ensures accurate alignment with standard commercial door preparations.
  • Heavy-Duty Latch Bolt: 3/4" projection stainless steel split anti-friction latch bolt improves durability and smooth operation under daily use.
  • Stainless Steel Faceplate: 1-1/4" x 8" stainless steel faceplate provides a rugged, corrosion-resistant finish for long-term reliability.
  • Brass Escutcheon: 10-9/16" x 2-3/8" x 9/32" brass escutcheon offers a substantial, premium trim appearance.
  • Reinforced Security Components: Stainless steel guard bolt and stainless steel rocker-type stop works add reinforced resistance against forced entry.
  • Forged Lever Construction: Forged brass/cast zinc lever parameters are plated to match finish symbols for consistent styling and strength.
  • Classic Visible Thumb Turn: Brass Classic Visible thumb turn standard for simple, reliable interior operation.
  • Optional Status Sensors: Available REX (request-to-exit), PRIV (privacy), DAJ (door ajar), and MKO (mechanical key override) sensors support integration into access control systems.

Certifications & Compliance

  • ANSI/BHMA Grade 1 Heavy Duty Mortise Lock
  • 2-Year Manufacturer's Warranty

Technical Specifications

  • Series: MSE Series
  • Product Group: Mechanical Locks
  • Product Subgroup: Mortise Locks and Trim
  • Product Type: Mortise Locks
  • Subcategory: Mortise Locks
  • Keyed Function: Single Cylinder
  • Commercial/Residential: Commercial
  • Keyed: Yes
  • Lock Function: Single Cylinder
  • Product Attribute: Mortise Locks
  • Electronic: No
  • Product Function: Entrance/Apartment/Dormitory
  • Product Category: Mechanical Locks
  • Department: Door Hardware
  • PDF:TownSteel Comprehensive Product Catalog: https://zensupply.com/content/pdf/townsteel/townsteel-comprehensive-product-catalog.pdf
  • PDF:TownSteel Product Showcase: https://zensupply.com/content/pdf/townsteel/townsteel-product-showcase.pdf

Typical Applications

  • Multi-Tenant Apartment Buildings
  • Student Dormitories and Housing
  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Government and Municipal Buildings
  • Mixed-Use Residential Properties

Why TownSteel MSS?

TownSteel MSS Series mortise locks deliver professional-grade reliability through ANSI Grade 1 heavy duty construction, a stainless steel split anti-friction latch bolt, stainless steel guard bolt and rocker-type stop works, and a forged brass/cast zinc lever assembly. Designed for single opening entrance, apartment, and dormitory doors, this sectional mortise lock is engineered to perform dependably in demanding commercial environments while remaining ready for future access control integration with optional REX, PRIV, DAJ, and MKO status sensors.

Product Specs

Series:
MSE Series
Product Group:
Mechanical Locks
Product Subgroup:
Mortise Locks and Trim
Product Type:
Mortise Locks
Subcategory:
Mortise Locks
Keyed Function:
Single Cylinder
Commercial/Residential:
Commercial
Lock Type:
Mortise
Keyed:
Yes
Lock Function:
Single Cylinder
Grade:
Grade 1
Duty Level:
Heavy Duty
Product Attribute:
Mortise Locks
Electronic:
No
Product Function:
Entrance/Apartment/Dormitory
Product Category:
Mechanical Locks
Department:
Door Hardware

TownSteel MSS-R-T-20-626 – Frequently Asked Questions

1) Will the TownSteel MSS Series mortise lock work with my existing 2-3/4 inch backset door prep?
The MSS Series mortise lock is built to a 2-3/4 inch backset, which is the standard commercial mortise backset. If your doors are already prepped for a 2-3/4 inch mortise pocket you are on the right geometry. The lock body faceplate measures 1-1/4 x 8 inches, so check that against the existing faceplate cutout, and the strike is a standard ANSI strike in plated or stainless steel.
2) What does entrance/apartment function mean on the TownSteel MSS mortise lock, and is it right for apartment unit doors?
Entrance/apartment/dormitory function is the classic unit-entry setup: the outside lever is locked or unlocked by key, and the inside lever always retracts the latch for free egress. That is what you want on an apartment or dorm room entry door. This is a single cylinder lock, so there is one keyed cylinder outside and a thumb turn inside (brass, Classic Visible style as standard). If you need key control from both sides, this is not the function to order.
3) Do I have to specify handing when ordering a TownSteel MSS mortise lock?
Yes, handing is required. The MSS is ordered as LH (left hand), RH (right hand), LHR (left hand reverse), or RHR (right hand reverse). Stand outside the door, on the side you use the key: if the hinges are on your left it is left hand, and if the door swings toward you it is a reverse hand. Getting this wrong on a mortise lock means the lever and latch face the wrong way.
4) Can I get a building full of TownSteel MSS locks keyed alike?
Keying is a required choice on the MSS: keyed different (the standard), keyed alike for multiple locks that should share one key, or a specific key code for special keying into an existing system. Property managers standardizing a building usually take keyed alike per unit group; if you already run a master system, order to key code. There is also an SFIC prep, less core option if you want to drop your own small format interchangeable cores in and control keying yourself.
5) Is the TownSteel MSS mortise lock Grade 1, and is it heavy duty enough for a high traffic apartment entry?
ANSI Grade 1 and rated heavy duty, which is the top commercial grade and what multifamily corridors, dorms, and institutional entries are normally specified to. Construction backs it up: stainless steel split anti-friction latch bolt, stainless guard bolt, stainless steel faceplate, stainless rocker type stop works, and forged brass or cast zinc levers plated to match the finish.
6) Will the TownSteel MSS latch into the strike that is already in my frame?
The latch bolt throws 3/4 inch and the lock uses a standard ANSI strike in plated or stainless steel. If your frame already has an ANSI strike prep (the common 1-1/4 x 4-7/8 inch commercial cutout) the replacement drops into the same hole. A split anti-friction latch also means it will still seat on a slightly out of true or heavily weatherstripped door where a plain latch drags.
7) What is the difference between the TownSteel MSS entrance lock and a storeroom mortise lock?
They are different functions and are not substitutes for each other. The TownSteel MSS is an Entrance/Apartment/Dormitory function, single cylinder, Grade 1 heavy duty mortise lock. A storeroom function keeps the outside lever locked at all times and is what you want on a mechanical or supply room: 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 Grade 1 heavy duty storeroom mortise lockset for 1-3/4 inch doors with an interchangeable core option. On a unit entry door where the lever needs to be left unlocked at times, the MSS entrance function is the correct one.
8) What is the closest cross-brand equivalent to the TownSteel MSS entrance/apartment mortise lock?
The Baldwin 6301LS is the nearest lever-by-lever match: it is a mortise lock body with an Entrance/Apartment function, the same function the TownSteel MSS carries. The Baldwin 6301LS is built on a 2-1/2 inch backset and fits doors 1-3/4 inch and over, while the TownSteel MSS uses a 2-3/4 inch backset, so the mortise pocket and cylinder centerline are not interchangeable between them. If the existing prep is 2-3/4 inch, the TownSteel MSS drops into it; if the door is prepped 2-1/2 inch, the Baldwin 6301LS is the one that matches the pocket.
9) Is the TownSteel MSS an electronic lock, and what do I order if I want a keypad on the apartment door?
The TownSteel MSS is a mechanical mortise lock - it is keyed, single cylinder, and not electronic, though the body is built to be integrated into an access control system with optional REX, privacy, door ajar and mechanical key override sensors. For a standalone keypad on the door instead, the Alarm Lock DL3500CR is a Grade 1 Trilogy electronic mortise lock with 300 user codes and classroom function for 1-5/8 to 1-7/8 inch doors, and the Dormakaba E-Plex E5086 is a Grade 1 electronic pushbutton and card mortise lock with entry/egress function. The BEST 45HZ EZ Series electronic keypad mortise lock includes a key override function.
10) The opening is a bedroom or bathroom door - is the TownSteel MSS the right lock?
No. The TownSteel MSS is a keyed single cylinder Entrance/Apartment/Dormitory lock and is not a privacy function. For bed and bath, the Hager 3840S is a Grade 1 privacy mortise lock with a 2-3/4 inch backset for doors 1-3/4 to 2 inch - the same backset the TownSteel MSS uses, so the door prep carries over. The Cal-Royal NM8440 is a Grade 1 heavy duty privacy mortise lockset with a deadbolt for 1-3/4 inch doors where the bathroom needs a throw bolt as well as the privacy latch.
11) What is the difference between the TownSteel MSS and the Sargent 7925 for a dormitory door?
Both are Grade 1 heavy duty mortise locks that cover dormitory openings. The TownSteel MSS is an Entrance/Apartment/Dormitory function, single cylinder, with sectional trim and a choice of MSE low or regular escutcheon. The Sargent 7925 in the 7900 Series is a dormitory exit function lock with rose trim and a single cylinder deadbolt. The deciding points are the deadbolt and the trim style: the Sargent 7925 carries a deadbolt and mounts on a rose, while the TownSteel MSS runs escutcheon trim on a 10-9/16 by 2-3/8 by 9/32 inch brass escutcheon.
12) I want small format interchangeable core keying - which mortise locks support that?
The TownSteel MSS is offered in an SFIC prep less core configuration as well as a standard cylinder configuration, so the SFIC version arrives prepped for your own core and you key it into an existing system. The Cal-Royal NM8080 Grade 1 heavy duty storeroom mortise lockset also carries an interchangeable core option, though it is a storeroom function rather than the entrance/apartment function of the TownSteel MSS.
13) We want mobile credentials on apartment entry doors - what replaces a mechanical mortise lock like the TownSteel MSS?
The TownSteel MSS is a mechanical lock, not electronic, though its body is ready for access control integration with optional request-to-exit, privacy, door ajar and mechanical key override sensors. For credential reading built into the lock, the Schlage Electronics LEBMB-ADD is a Grade 2 mobile-enabled mortise lock with push button and LED covering privacy, office and apartment functions, rated 3 hours fire, for 1-3/4 inch doors. The Schlage Electronics LEMD-GRW is Grade 1, 3 hour fire rated, an ENGAGE Series wireless mortise lock with a 125kHz proximity reader and mobile-enabled deadbolt, right hand, with Greenwich trim.
14) The mortise lock has to be electrified for a card access system - what do I order instead of the TownSteel MSS?
The TownSteel MSS itself is mechanical and non-electronic, built to be integrated into an access control system with optional REX, privacy, door ajar and mechanical key override sensors. For a lock that is itself electrified, the Command Access ML190 is a heavy duty motorized mortise lock with storeroom function, field selectable fail safe or fail secure operation and 24VDC power. The BEST 45HW Series is a heavy duty wired electromechanical mortise lock running 12V or 24V, 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.
15) Can I match the TownSteel MSS mortise lock to the finishes on the rest of my building?
Seven finishes are offered: 605 bright brass, 606 satin brass, 622 matte black, 625 bright chrome, 626 satin chrome, 629 bright stainless steel, and 630 satin stainless steel. 626 and 630 are the two that cover most commercial openings. Levers come in eight styles (Artistic, Congr, Gala, Imperial, Quest, Regal, Sentinel, Tango) and are plated to match the finish symbol, so lever choice and finish stay consistent across a floor.
16) Is the TownSteel MSS an electronic lock, or do I need a different lock for access control?
The MSS is a mechanical, key operated mortise lock, not an electronic one. If you need credentials, audit trail, or networked control on the same opening, ZenSupply carries electronic mortise locks such as the Alarm Lock DL3500CR Trilogy Grade 1 with 300 user codes, the Dormakaba E-Plex 2066 pushbutton keyless mortise lock, or the Schlage Electronics LEMD-GRW ENGAGE wireless mortise lock with a 125 kHz proximity reader. For a motorized electric mortise lock body wired into an existing access control panel, the Command Access ML190 Series runs on 24VDC with field selectable fail safe or fail secure operation.
17) What is the difference between the TownSteel MSS entrance/apartment lock and a storeroom or classroom mortise lock?
Function is the whole difference. Entrance/apartment lets the occupant lock and unlock the outside lever by key or thumb turn, which is what a tenant needs. A storeroom function keeps the outside lever locked at all times and only a key retracts the latch, better for mechanical and supply rooms; ZenSupply carries the Accentra 8805FL Grade 1 storeroom mortise and the Cal-Royal NM8080 Grade 1 storeroom lockset for that. Classroom function locks and unlocks the outside lever by key only, with no inside control, which is the Corbin Russwin ML2003 or the Cal-Royal NM8070. Same door prep across all of them, so you can mix functions on one project.
18) Is there a Grade 1 mortise lock equivalent to the TownSteel MSS from another brand if I need to match an existing spec?
For a like-for-like entrance/apartment mortise, the Baldwin 6301LS is an entry/apartment lever by lever mortise lock body, though it runs a 2-1/2 inch backset rather than the MSS 2-3/4 inch, so the door prep is not interchangeable. On the same 2-3/4 inch backset, Hager's 3800 Series Grade 1 mortise locks (3810E passage with escutcheon, 3850E office with escutcheon) match the MSS geometry and also use escutcheon trim, but in different functions. The Cal-Royal NM8050 Grade 1 office/entrance lockset with auxiliary deadlatch is the closest Grade 1 entrance-type alternative.
19) Does the TownSteel MSS mortise lock take small format interchangeable cores?
An SFIC prep, less core version is available alongside the standard cylinder version. Order the SFIC prep if your facility already runs interchangeable cores and you want to pin and pull cores yourself without removing the lock; note it ships without a core, so the cores come from your own stock. Order the standard cylinder version if you want the lock keyed and ready to hang.
20) Can the TownSteel MSS be tied into an access control system later?
The MSS lock body is built for single opening, stand alone use but is made to be integrated into access control systems, and optional status sensors are available: REX (request to exit), PRIV (privacy), DAJ (door ajar), and MKO (mechanical key override). Those are the monitoring points a panel needs to know whether someone exited legitimately, whether privacy is set, and whether the door is standing open. Specify the sensors when you order, since they are built into the lock case.
21) What is the advantage of a mortise lock like the TownSteel MSS over a cylindrical lock on an apartment entry?
A mortise lock puts the whole mechanism in a pocket routed into the door edge instead of through a 2-1/8 inch bore, which gives room for a heavier case, a guard bolt, and a thumb turn on the same lock. On the MSS that is a stainless split anti-friction latch, a stainless guard bolt that deadlocks the latch against carding, and a Grade 1 heavy duty rating. The tradeoff is the door has to be mortised: a cylindrical lock like the Schlage PC10 Grade 1 installs in a bored door and is the cheaper retrofit if your doors are not already prepped for a mortise pocket.
22) I need the same apartment function but with knobs instead of levers - what mortise lock does that?
The Baldwin 6301 is the knob-by-knob version of the same Entry/Apartment mortise lock body, on a 2-1/2 inch backset for doors 1-3/4 inch and over. The TownSteel MSS is a lever product throughout - it is offered in Artistic, Congr, Gala, Imperial, Quest, Regal, Sentinel and Tango lever styles, with no knob trim in the range. Where an apartment entry has to keep round knob trim to match the rest of the building, the Baldwin 6301 is the one to specify.
23) The corridor door does not need to lock at all - is there a simpler mortise lock than the TownSteel MSS?
Yes. The TownSteel MSS is keyed and single cylinder, which is more lock than a hall or closet door needs. For a non-keyed opening, the Hager 3810E is a Grade 1 passage mortise lock with escutcheon trim and a 2-3/4 inch backset for doors 1-3/4 to 2-1/2 inch - the same 2-3/4 inch backset the TownSteel MSS uses. The Hager 3810S is the same passage lock with rose trim instead of an escutcheon, and the Falcon MA101 is a Grade 1 heavy duty mortise passage lock with field reversible operation and a fire rating.
24) Can I use a mortise deadbolt instead of the TownSteel MSS on an apartment entry?
A mortise deadbolt is not a substitute - it has no latch and no lever, so it cannot operate the door on its own. The TownSteel MSS is a complete sectional trim lockset with a 3/4 inch projection stainless steel split anti-friction latch bolt, a stainless steel guard bolt and lever trim. The Sargent 4874 is a double cylinder mortise deadbolt on a 2-3/4 inch backset and the Kaba Ilco 185 Series is a no-handing mortise deadbolt; both are bolt-only products that pair with separate latching hardware rather than replacing an entry lockset.
25) I only need the lock body, not the trim - what should I look at instead of the TownSteel MSS?
The TownSteel MSS ships as a complete sectional trim lockset with lever, escutcheon and thumb turn. If your existing trim is staying on the door and only the chassis is being replaced, the BEST 45H Series is a heavy duty mortise lock body with public entrance function and field reversible operation, and the BEST 45HCA Series is a heavy duty mortise lockbody with intruder function. The Baldwin 6301LS is likewise sold as an Entry/Apartment mortise lock body on a 2-1/2 inch backset.
26) The office suite door needs to be lockable from the inside during the day - does the TownSteel MSS do that?
The TownSteel MSS is an Entrance/Apartment/Dormitory function with a brass thumb turn and stainless steel rocker type stop works, and a single cylinder outside. If the specification calls out an office function specifically, the Cal-Royal NM8050 is a Grade 1 heavy duty Office/Entrance 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 trim, non-keyed, on a 2-3/4 inch backset for doors 1-3/4 to 2-1/2 inch.
27) Are the Emtek mortise entrance locksets an alternative to the TownSteel MSS?
No - the Emtek 3019 Brisbane, 3102 Memphis, 3104 Hamilton and 3106 Manhattan mortise entrance locksets are all dummy function, meaning they are fixed trim with no working latch or cylinder, used on inactive leaves and closet fronts. The TownSteel MSS is a keyed, single cylinder Grade 1 heavy duty working lock with a 3/4 inch projection latch bolt and an ANSI plated stainless steel strike. Order a dummy set only for the inactive side of a pair.
28) Is a cylindrical lock an option in place of the TownSteel MSS mortise lock?
Only if the door is being prepped new. The TownSteel MSS is a mortise lock and needs a mortise pocket cut into the door edge with a 1-1/4 by 8 inch stainless steel faceplate. A cylindrical lock such as the Schlage PC10 Grade 1 passage cylindrical lock for 1-3/4 inch doors bores through the door face instead and cannot fill an existing mortise pocket. If the door is already mortised, stay with a mortise product - the Schlage PM010 is a Grade 1 passage latch mortise lock for 1-3/4 inch doors on that prep.
29) The door is thinner than a standard commercial door - is the TownSteel MSS still the right mortise lock?
The TownSteel MSS is a heavy duty commercial lock on a 2-3/4 inch backset with an 8 inch faceplate, sized for standard commercial door construction. For narrow ornamental iron doors, the Marks USA 21AC and 22AC are entrance double cylinder mortise locks with a round knob built for 1 inch doors. For an aluminum stile door, the Alarm Lock DL1300NW Trilogy Networx wireless electronic mortise lock is made for Adams Rite deadlatches, and the Dormakaba E-Plex 2066 is a wide stile electronic pushbutton keyless mortise lock.
30) Which mortise locks are heavy duty rather than medium duty for a high traffic entry?
The TownSteel MSS is a heavy duty Grade 1 commercial mortise lock with a stainless steel split anti-friction latch bolt, stainless steel guard bolt and rocker type stainless stop works. Among the alternatives, the BEST 45H and 45HCA lock bodies, the BEST 45HW wired electromechanical lock, the Falcon MA101 passage lock and the Sargent 7925 dormitory lock are all heavy duty as well. The Codelocks CL2255 electronic tubular mortise latch is a medium duty product and is built for lighter traffic than a main building entry.
31) Can I match the TownSteel MSS finish to Schlage or Accentra hardware already in the building?
The TownSteel MSS is finished to BHMA finish symbols - 605 bright brass, 606 satin brass, 622 matte black, 625 bright chrome, 626 satin chrome, 629 bright stainless steel and 630 satin stainless steel - with levers in forged brass or cast zinc plated to match the finish symbol. Because those are standard BHMA numbers, a 626 satin chrome MSS sits alongside 626 hardware from other manufacturers, such as the Schlage L9092EU with 03A trim supplied in 626. Ordering by the number rather than the finish name is the reliable way to keep a building consistent.
32) What should I use instead of the TownSteel MSS on a glass door or a push/pull opening?
Neither is a fit for a standard mortise lockset. The TownSteel MSS mortises into a door edge with a 1-1/4 by 8 inch faceplate and a 2-3/4 inch backset. For a glass door, the Kaba Ilco BR Series is a glass door bottom rail lock. For a hospital or behavioral health opening needing push/pull operation, the Marks USA 5PDN is a Grade 1 hospital passage mortise push/pull paddleset, ligature resistant and ADA compliant, in satin stainless steel.
33) Do the levers on the TownSteel MSS hold up to commercial traffic, or are they cast trim?
Levers are forged brass or cast zinc, plated to match the finish symbol, with stainless steel rocker type stop works inside the case handling the lock and unlock action. Eight lever designs are offered, from plainer commercial shapes like Quest and Sentinel to more decorative ones like Imperial and Regal, so a hospitality or multifamily project can pick trim that reads residential while the lock body stays Grade 1 heavy duty commercial.
34) Is there a template for prepping the door for the TownSteel MSS mortise lock?
TownSteel publishes an MSS installation template, linked from the product information, and the key case dimensions to prep to are a 2-3/4 inch backset with a 1-1/4 x 8 inch faceplate on the door edge and a 10-9/16 x 2-3/8 x 9/32 inch escutcheon on the face. Prep the frame for a standard ANSI strike. Confirm handing before you cut, since the mortise pocket itself is symmetrical but the lock is handed.
35) Will a thumbturn or escutcheon part substitute for a full TownSteel MSS lockset?
No. The Sargent 130KB and 130W are standard duty mortise thumbturns, the 130W with a round backplate, and the Falcon MESC600DT is a fire rated dummy escutcheon lever trim for M9900 Series exit devices. Those are trim components that mount to hardware already in the door. The TownSteel MSS is the complete heavy duty Grade 1 lockset - lock body, 1-1/4 by 8 inch stainless faceplate, brass escutcheon, lever and brass thumb turn - and is what you order when the whole lock is being replaced.
How fast can I get the TownSteel MSS-R-T-20-626 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 TownSteel MSS-R-T-20-626 come with a warranty?
Absolutely. The TownSteel MSS-R-T-20-626 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 TownSteel MSS-R-T-20-626?
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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