TownSteel MSS Series ANSI Grad...
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$685.08
TownSteel TownSteel MSS Series Storeroom Function - Heavy Duty Sectional Mortise Lock , Double Cylinder TWS-MSS-14

TownSteel MSS Series ANSI Grade 1 Heavy Duty Sectional Mortise Lock, Storeroom Function Double Cylinder

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Model: MSS-R-T-14-629
$690.00
$685.08
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$690.00
$685.08
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TownSteel MSS Series ANSI Grade 1 Heavy Duty Sectional Mortise Lock, Storeroom Function Double Cylinder

The TownSteel MSS Series is a heavy duty sectional mortise lock engineered for storeroom function applications with double cylinder keyed operation. Rated ANSI Grade 1, this mortise lock features a 2-3/4" backset, a 3/4" projection stainless steel split anti-friction latch bolt, and a durable 1-1/4" x 8" stainless steel faceplate. Designed for single opening, stand-alone installations, the MSS Series can also be readily integrated into sophisticated access control systems using optional status sensors.

Key Features

  • Backset Dimension: 2-3/4" backset for standard commercial door prep compatibility.
  • Faceplate Specifications: 1-1/4" x 8" stainless steel faceplate for long-lasting corrosion resistance.
  • Escutcheon Dimensions: 10-9/16" x 2-3/8" x 9/32" brass escutcheon for sectional trim coverage.
  • Heavy-Duty Latch Bolt: 3/4" projection, stainless steel, split, anti-friction latch bolt for smooth, reliable operation.
  • Stainless Steel Guard Bolt: Reinforced guard bolt construction helps resist tampering and forced entry.
  • Forged Lever Construction: Forged brass/cast zinc lever parameters, plated to match finish symbols, for durable commercial-grade trim.
  • Access Control Ready: Optional status sensors including REX (request-to-exit), PRIV (privacy), DAJ (door ajar), and MKO (mechanical key override) for integration into access control systems.
  • Double Cylinder Storeroom Function: Sectional trim design with double cylinder keyed operation for controlled storeroom security.

Certifications & Compliance

  • ANSI Grade 1 Heavy Duty Rated
  • 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: Double Cylinder
  • Commercial/Residential: Commercial
  • Keyed: Yes
  • Lock Function: Double Cylinder
  • Product Attribute: Mortise Locks
  • Electronic: No
  • Product Function: Storeroom
  • 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

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

Why TownSteel MSS?

TownSteel MSS Series mortise locks deliver professional-grade reliability with ANSI Grade 1 heavy duty construction, stainless steel latch and guard bolts, and forged brass/cast zinc lever trim built for demanding commercial environments. Engineered for dependable storeroom function security, the sectional trim design and double cylinder keyed operation make this an ideal choice for single-opening or access-control-integrated installations.

Product Specs

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

TownSteel MSS-R-T-14-629 – Frequently Asked Questions

1) Will the TownSteel MSS Series mortise lock work in a standard 2-3/4 inch backset mortise prep?
Yes. The MSS Series lock body is built for a 2-3/4 inch backset, which is the standard commercial mortise backset, and it uses a 1-1/4 x 8 inch stainless steel faceplate. If your existing pocket was cut for a 2-3/4 inch backset with an 8 inch face, the body drops into that prep. TownSteel publishes an MSS template, so a contractor cutting a new door should lay the pocket out from that rather than from an old door.
2) Will the TownSteel MSS mortise lock latch into the ANSI strike already in my frame?
In most commercial frames, yes. The MSS latch bolt is stainless steel with a 3/4 inch projection, split and anti-friction, and it ships with an ANSI strike in plated or stainless steel. A 3/4 inch throw reaches into any standard ANSI 4-7/8 inch lip strike prep, so if your frame is already ANSI prepped you can reuse the frame cutout and just swap the strike plate. The anti-friction latch matters on doors with a closer, it keeps the latch from dragging on the strike lip as the door swings shut.
3) What does storeroom function mean on a TownSteel MSS mortise lock, and is it right for a mechanical room?
Storeroom function is the standard lockdown lock for a room you never want left unsecured. The outside lever stays locked at all times and is retracted only by the key; the inside lever always retracts the latch for free egress. Nobody can accidentally leave the door unlocked by flipping a button, which is exactly why storeroom is specified on mechanical rooms, electrical closets, telecom rooms, and stock rooms. If you want a door that can be left unlocked during business hours, storeroom is the wrong function.
4) Which handing do I order for the TownSteel MSS mortise lock, and what does LHR mean?
Handing is required at order and there is no field reversal offered, so get it right the first time. Stand outside the door, on the side you secure. Hinges on your left and the door swings away from you is LH; hinges on the right swinging away is RH. If the door swings toward you, it is a reverse bevel: hinges on the left is LHR, hinges on the right is RHR. Reverse bevel is common on doors that swing out into a corridor or out of a stairwell. The four choices offered are LH, RH, LHR and RHR.
5) Is the TownSteel MSS mortise lock ANSI Grade 1, and is it heavy enough for a high traffic commercial door?
Grade 1 heavy duty, which is the top ANSI/BHMA durability tier and the one normally specified for commercial and institutional openings. The wear parts back that up: stainless steel latch bolt, stainless steel guard bolt, stainless steel faceplate and a stainless steel rocker type stop works. Levers are forged brass or cast zinc plated to match the finish. For a school corridor, a hospital service door, or a multifamily service room, Grade 1 is what a spec will call for.
6) Can I get the TownSteel MSS mortise lock with a small format interchangeable core prep?
Yes. The MSS is offered two ways on the cylinder: SFIC prep less core, or standard cylinder. Order SFIC prep less core if your facility keys everything on a small format interchangeable core system and your locksmith will drop in your own cores, which keeps the lock on your existing master key system with no rekeying. Order standard if you want the lock to come with a conventional cylinder. This is a double cylinder configuration, so it is keyed on both sides.
7) Can I have several TownSteel MSS mortise locks keyed alike so one key opens all of them?
Yes. Keying is a required selection with three choices: KD keyed different, which is standard and gives each lock its own key; KA keyed alike, where every lock on the order takes the same key; or a specific key code for special keying, entered in the key code field at order. A property manager standardizing service closets across a building normally takes KA. If you are matching an existing masterkey system instead, use the key code option, or order SFIC prep less core and pin your own cores.
8) What is the closest Grade 1 storeroom mortise lock to the TownSteel MSS if I need a different brand on the same opening?
The Accentra 8805FL is the nearest straight equivalent. It is a Grade 1 mortise lock in storeroom function from the 8800 Series, which matches the MSS Series on both grade and function. The MSS is a Grade 1 heavy duty mortise lock in storeroom function with a 2-3/4 inch backset, a 1-1/4 inch by 8 inch stainless steel faceplate and an ANSI strike. The Cal-Royal NM8080 is a second Grade 1 storeroom mortise lockset and is listed for 1-3/4 inch doors, with an interchangeable core option that parallels the SFIC prep, less core build of the MSS.
9) The opening needs to be electrically released from an access control panel - what mortise lock does that instead of the TownSteel MSS?
The MSS is a mechanical lock with optional status sensors including REX, PRIV, DAJ and MKO, so it reports condition to a system but is not itself electrically released. For an electrified lock body, the Command Access ML190 is a heavy duty motorized mortise lock in storeroom function with field selectable EL and EU operation on 24VDC - the same storeroom function as the MSS. The BEST 45HW is a heavy duty wired electromechanical mortise lock with 12V and 24V operation. The Schlage L9092EU with 03A trim is a heavy duty electric lock/unlock outside lever mortise lock, keyed outside, with request to exit, on 12/24VDC for 1-3/4 inch doors.
10) What is the difference between the MSE low and regular escutcheon on the TownSteel MSS lock?
The escutcheon is the long plate that carries the lever, and the MSS offers it in MSE Low or MSE Regular. The escutcheon is brass and measures 10-9/16 x 2-3/8 x 9/32 inches. That 2-3/8 inch dimension is the one to check against your door: a sectional trim plate that width needs a stile with room for it, so on a narrow stile aluminum door this is not the lock. Pick the profile that matches the other openings in the building so the doors read the same.
11) Is the TownSteel MSS mortise lock electronic or does it need power run to the door?
Purely mechanical. The MSS is a keyed storeroom mortise lock with no electronics, so there is no power transfer hinge, no wiring, and no access control panel involved. If you need the opening on a credential system or on an access control head end, look at an electrified mortise instead, for example the BEST 45HW wired electromechanical mortise lock, which runs on 12V or 24V, or the Command Access ML190 Series motorized mortise, which is a storeroom function unit on 24VDC.
12) Is the Sargent 4874 a substitute for the TownSteel MSS double cylinder mortise lock?
No. The Sargent 4874 is a double cylinder mortise deadbolt with a 2-3/4 inch backset from the 4870 Series - a deadbolt body only, with no latch and no lever trim. The TownSteel MSS is a keyed storeroom mortise lock with sectional lever trim, a 3/4 inch projection stainless steel split anti-friction latch bolt, a stainless steel guard bolt and a brass thumb turn, and its levers are offered in Artistic, Congr, Gala, Imperial, Quest, Regal, Sentinel and Tango styles. The 4874 shares the 2-3/4 inch backset with the MSS, so the two can share a common mortise pocket location, but the 4874 is what you add for deadbolt security, not what you use to latch and operate the door.
13) I do not need a keyed lock on this opening - what is the passage equivalent?
For a non-keyed passage mortise lock, the Falcon MA101 is a Grade 1 heavy duty mortise passage lock with field reversible operation and a fire rating, from the MA Series. The Hager 3810E is a Grade 1 passage mortise lock with escutcheon and a 2-3/4 inch backset for doors 1-3/4 inch to 2-1/2 inch, matching the 2-3/4 inch backset of the TownSteel MSS; the Hager 3810S is the same passage lock with rose trim instead of an escutcheon. The Schlage PM010 is a Grade 1 non-keyed passage latch mortise lock for 1-3/4 inch doors. The MSS is a keyed storeroom lock and cannot be converted to free passage.
14) What do I use instead of the TownSteel MSS if the opening needs credential access rather than a key?
The MSS is a mechanical, non-electronic lock, so credential access means a different lock body. The BEST 45HZ EZ Series is an electronic keypad mortise lock with key override. The Accentra nexTouch NTM623-NR is a Grade 1 mortise lock with a capacitive touchscreen keypad and cylinder override, with no deadbolt. The Dormakaba E-Plex 2066 is an electronic pushbutton keyless mortise lock. For credential plus wireless management, the Schlage LEMD-GRW is a Grade 1 ENGAGE Series wireless mortise lock with a 125kHz proximity reader and a 3 hour fire rating.
15) Restroom or bedroom door - can I use the TownSteel MSS storeroom mortise lock there?
Storeroom function locks the outside lever permanently and releases by key, which is not what a restroom or bedroom needs. For privacy, the Cal-Royal NM8440 is a Grade 1 heavy duty privacy mortise lockset with deadbolt for 1-3/4 inch doors, and the Hager 3840S is a Grade 1 privacy mortise lock with a 2-3/4 inch backset for doors 1-3/4 inch to 2 inch - the same 2-3/4 inch backset the TownSteel MSS uses, so the mortise pocket layout carries over. Where you want privacy under electronic control, the Schlage CO-100 is a Grade 1 heavy duty standalone electronic mortise lock in privacy function with a keypad reader for 1-3/4 inch doors.
16) Are the Emtek mortise entrance locksets an alternative to the TownSteel MSS?
No, not for a functioning opening. The Emtek 3019 Brisbane, 3102 Memphis, 3104 Hamilton and 3106 Manhattan mortise entrance locksets are all dummy function - trim with no latch and no key operation, used on inactive leaves and closet faces. The TownSteel MSS is a keyed commercial Grade 1 storeroom mortise lock with a working latch bolt and guard bolt. If you want dummy trim to visually pair with a working lock elsewhere in the building, the Schlage L0170 is a Grade 1 heavy duty half dummy trim in the L Series for 1-3/4 inch doors.
17) The tenant needs to get out of a dorm room but the corridor side should stay secure - is the MSS the right function?
Storeroom function is a one-way arrangement: the outside lever stays locked and the inside lever always retracts the latch, with no occupant-controlled deadbolt. For a corridor or dormitory opening where the occupant throws a deadbolt from inside, the Sargent 7925 is a Grade 1 heavy duty dormitory exit function mortise lock in the 7900 Series with rose trim and a single cylinder deadbolt. The TownSteel MSS carries rectangular sectional escutcheon trim measuring 10-9/16 by 2-3/8 by 9/32 inches in brass, in low and regular heights, so the prep and appearance differ from a rose-trim lock.
18) I need a lock body only to drop into an existing mortise pocket, not a complete lockset - what is the option?
The BEST 45H is a heavy duty mortise lock body in public entrance function with field reversible operation, and the BEST 45HCA is a heavy duty mortise lockbody with intruder function. Baldwin offers lock bodies at a 2-1/2 inch backset: the 6310 entry/storeroom knob by knob body for doors 1-3/8 inch and over, and the 6301 entry/apartment body in knob by knob or lever by lever for doors 1-3/4 inch and over. Note the backset difference - the TownSteel MSS uses a 2-3/4 inch backset, so a 2-1/2 inch Baldwin body sits at a different distance from the door edge and will not reuse the same pocket.
19) The office door should lock and unlock by key without holding the lever locked full time - what replaces the storeroom function?
That is office or entrance function rather than storeroom. The Cal-Royal NM8050 is a Grade 1 heavy duty office/entrance mortise lockset with auxiliary deadlatch for 1-3/4 inch doors. The Hager 3850E is a Grade 1 office mortise lock, non-keyed, with lever and escutcheon on a 2-3/4 inch backset for doors 1-3/4 inch to 2-1/2 inch. The TownSteel MSS is keyed in storeroom function on the same 2-3/4 inch backset, so the pocket location is common between it and the 3850E.
20) Is the Marks USA 21AC or 22AC a substitute for the TownSteel MSS on a storefront or ornamental iron door?
No. The Marks USA 21AC and 22AC are entrance double cylinder ornamental iron mortise locks with a round knob, listed for 1 inch doors. The TownSteel MSS is a heavy duty commercial mortise lock with a 1-1/4 inch by 8 inch stainless steel faceplate and a 10-9/16 inch escutcheon, sized for a standard commercial door stile rather than a 1 inch ornamental iron section. If the opening is a glass door bottom rail instead, the Kaba Ilco BR Series glass door bottom rail lock is the part built for that condition.
21) The facility needs a push/pull paddle for ADA and ligature resistance instead of a lever - what mortise option covers that?
The Marks USA 5PDN is a Grade 1 hospital passage mortise push/pull paddleset in the 195 Series, ligature resistant and ADA compliant, in satin stainless steel. It is a passage paddleset, so it does not lock; the TownSteel MSS is a keyed storeroom mortise lock and its operating trim is a lever in Artistic, Congr, Gala, Imperial, Quest, Regal, Sentinel or Tango style, finished to match symbols including 630 satin stainless steel.
22) We are adding keypad access to existing Adams Rite deadlatches - is a TownSteel MSS the right lock for that?
No. The Alarm Lock DL1300NW Trilogy Networx is a wireless electronic mortise lock with a keypad made specifically for Adams Rite deadlatches, which is a narrow stile aluminum condition. The TownSteel MSS is a heavy duty sectional mortise lock with a 1-1/4 inch by 8 inch faceplate and a 10-9/16 inch by 2-3/8 inch escutcheon, dimensions that call for a standard commercial door rather than a narrow aluminum stile.
23) We want to standardize a building on Grade 1 mortise hardware across several functions - which peers pair with the TownSteel MSS?
The TownSteel MSS covers the storeroom openings as a Grade 1 heavy duty commercial mortise lock. Cal-Royal fills the rest of a building from one Grade 1 family, all listed for 1-3/4 inch doors: NM8080 storeroom, NM8070 classroom, NM8050 office/entrance and NM8440 privacy with deadbolt. Hager covers the same span in the 3800 Series on a 2-3/4 inch backset, the same backset the MSS uses: 3810E passage with escutcheon, 3810S passage with rose, 3840S privacy and 3850E office.
24) What lever styles and finishes does the TownSteel MSS mortise lock come in?
Eight lever designs are offered: Artistic, Congr, Gala, Imperial, Quest, Regal, Sentinel and Tango, in forged brass or cast zinc plated to match the finish. Seven finishes are available: 605 bright brass, 606 satin brass, 622 matte black, 625 bright chrome, 626 satin chrome, 629 bright stainless steel and 630 satin stainless steel. For matching existing hardware in a commercial building, 626 satin chrome and 630 satin stainless are the two that turn up most often on institutional openings.
25) Does the TownSteel MSS mortise lock have a thumb turn on the inside?
The MSS uses a brass thumb turn, Classic Visible as standard. On a double cylinder storeroom configuration the thumb turn is the visible operator on the secure side rather than a second key. Worth knowing before you spec it on an egress door: some jurisdictions restrict double cylinder hardware on required exits, so confirm with your AHJ on any door in the means of egress.
26) What is a guard bolt on a mortise lock and does the TownSteel MSS have one?
The MSS carries a stainless steel guard bolt, sometimes called an auxiliary deadlatch. It is the small plunger that sits beside the main latch; when the door closes, the strike lip holds it in, and that in turn deadlocks the latch bolt so it cannot be shimmed or carded back with a plastic strip. On a storeroom door protecting stock or equipment, that is the feature that makes the difference between a latch and a lock. It only works if the strike is aligned so the guard bolt lands on the strike face, not in the cutout.
27) Can I use a lighter duty mortise latch instead of the TownSteel MSS on an interior door?
The Codelocks CL2255 is an electronic tubular mortise latch in the CL2000 Series at medium duty in brushed steel. The TownSteel MSS is a heavy duty Grade 1 commercial mortise lock with a stainless steel split anti-friction latch bolt at 3/4 inch projection, a stainless steel guard bolt and stainless steel rocker type stop works. The two are built for different traffic loads, and the CL2255 is a tubular mortise latch rather than a full sectional lockset, so the door prep is not shared.
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Does the TownSteel MSS-R-T-14-629 come with a warranty?
Absolutely. The TownSteel MSS-R-T-14-629 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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