TownSteel MSS Series ANSI Grad...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$529.00
$525.22
TownSteel TownSteel MSS Series Entry/Office Function - Heavy Duty Sectional Mortise Lock , Single Cylinder TWS-MSS-04

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

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Model: MSS-R-T-04-605
$529.00
$525.22
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$529.00
$525.22
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TownSteel MSS Series ANSI Grade 1 Heavy Duty Sectional Mortise Lock - Entry/Office Function, Single Cylinder

The TownSteel MSS Series ANSI Grade 1 Heavy Duty Sectional Mortise Lock is an Entry/Office Function, Single Cylinder lockset designed for single opening, stand-alone applications, with the flexibility to integrate into sophisticated access control systems. This motorized mortise lock features a 2-3/4" backset, a 3/4" projection stainless steel split anti-friction latch bolt, and a durable stainless steel and brass trim package built for dependable commercial performance.

Key Features

  • Backset & Latch Bolt: 2-3/4" backset with a 3/4" projection stainless steel, split, anti-friction latch bolt for smooth, reliable operation.
  • Heavy-Duty Trim: 1-1/4" x 8" stainless steel faceplate paired with a 10-9/16" x 2-3/8" x 9/32" brass escutcheon for a durable, finished appearance.
  • Forged Construction: Forged brass/cast zinc levers plated to match finish symbols, a stainless steel guard bolt, and stainless steel rocker-type stop works for long-term commercial durability.
  • Sectional Trim Design: Sectional trim configuration suited for single opening, stand-alone door applications.
  • Access Control Ready: Readily integrates into sophisticated access control systems for expanded security applications.
  • Optional Status Sensors: Available with REX (request-to-exit), PRIV (privacy), DAJ (door ajar), and MKO (mechanical key override) sensors for enhanced monitoring and control.
  • ANSI Strike: ANSI strike, plated/stainless steel, for standard frame preparation compatibility.
  • Thumb Turn: Brass Classic Visible thumb turn standard for simple, secure interior operation.

Certifications & Compliance

  • ANSI 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/Office
  • Product Category: Mechanical Locks
  • Department: Door Hardware

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 forged brass/cast zinc lever construction, stainless steel internal components, and an ANSI Grade 1 heavy duty rating built for demanding commercial entryways. Engineered for single opening and stand-alone use with ready access control integration, this mortise lock is built to perform reliably in high-traffic commercial environments.

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/Office
Product Category:
Mechanical Locks
Department:
Door Hardware

TownSteel MSS-R-T-04-605 – Frequently Asked Questions

1) What does the Entrance/Office function do on this TownSteel mortise lock?
Entry/Office function on the MSS Series means the outside lever is locked or unlocked by the key from outside, or by the inside thumb turn, and the inside lever always retracts the latch for free egress. It is a single cylinder lock, so there is one keyed cylinder on the outside and a brass thumb turn on the inside (Classic Visible style is standard). That is the usual choice for an office or suite door where staff want to leave it unlocked during business hours and lock it on the way out.
2) Do I have to specify handing when I order the TownSteel MSS mortise lock?
Yes, handing is required. You pick LH (left hand), RH (right hand), LHR (left hand reverse), or RHR (right hand reverse) at the time of order. Stand outside the door on the key side: if the hinges are on your left it is a left hand door, and if the door swings toward you rather than away it is a reverse. Get this wrong and the lever and latch orientation will be wrong for the opening.
3) Will this TownSteel mortise lock latch into my existing ANSI strike?
It should. The MSS latch bolt is stainless steel with a 3/4 inch projection, split and anti-friction, and the lock is supplied with an ANSI strike. A 3/4 inch throw into a standard ANSI 4-7/8 inch strike is the normal commercial pairing, so if your frame already has an ANSI strike cutout you can reuse the prep. The anti-friction latch also helps the door latch cleanly against a closer or a positive-pressure gasketed frame.
4) Can I key several TownSteel MSS locks alike across a building?
Yes. Keying is a required selection: KD keyed different is standard, KA keys multiple locks alike, and there is a Key Code option if you need the locks cut to an existing code or a specific bitting, with a text field to enter that code. Property managers standardizing a floor or a building typically take KA, or Key Code to stay on the key system already in the building.
5) Does the TownSteel MSS mortise lock take a small format interchangeable core?
It can. The cylinder choice is either Standard or SFIC Prep, Less Core. SFIC Prep ships without the core so your locksmith installs the SFIC core from the facility's existing key system. If you order Standard, you get the conventional cylinder configuration instead. For institutions already running SFIC across a campus, the less-core option is the one to pick.
6) I need a classroom or storeroom function, not entry/office. Is this the right TownSteel lock?
No. This one is Entrance/Office function, meaning the outside lever can be left unlocked by key or inside thumb turn. For a classroom door where the outside lever must be locked and unlocked only by key, look at the Corbin Russwin ML2003 Grade 1 mortise classroom lockset or the Cal-Royal NM8070. For a storeroom door that stays locked outside at all times, the Cal-Royal NM8080 or Accentra 8805FL are the functions you want.
7) What is the closest cross-brand equivalent to the TownSteel MSS entry/office mortise lock?
The Cal-Royal NM8050 is the closest match. It is a heavy duty Grade 1 mortise lockset with an Entrance/Office function, the same grade and function the TownSteel MSS carries, and it is listed for 1-3/4 inch doors. The TownSteel MSS is a sectional trim single cylinder lock on a 2-3/4 inch backset with a 1-1/4 by 8 inch stainless faceplate.
8) I need a mortise lock that stays locked from the outside at all times instead of office function - what should I order?
Go to a storeroom function. The Cal-Royal NM8080 is a heavy duty Grade 1 storeroom mortise lockset with an interchangeable core option for 1-3/4 inch doors, and the Accentra 8805FL is a Grade 1 storeroom mortise lock in the 8800 Series with an Arcadia lever. The TownSteel MSS is built as an Entrance/Office function, single cylinder, where the outside lever can be left unlocked for business hours.
9) The opening is a classroom door - is the MSS entry/office lock the right choice?
For a classroom you want a classroom function rather than entry/office. The Cal-Royal NM8070 is a heavy duty Grade 1 classroom mortise lockset for 1-3/4 inch doors, the Corbin Russwin ML2003 is a Grade 1 mortise classroom lockset in the ML2000 Series for 1-3/4 inch doors, and the Marks USA LA318GJ is a Grade 1 classroom security indicator mortise lockset with an ANSI strike. The TownSteel MSS is an Entrance/Office function lock.
10) We want keypad or credential access on this opening - what replaces the mechanical MSS?
Several electronic mortise locks cover that. The Schlage CO-100-MS is a standalone electronic mortise lock with a keypad reader, Grade 1, heavy duty, for 1-3/4 inch doors. 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. The Dormakaba E-Plex E5086 is a Grade 1 pushbutton and card lock. The TownSteel MSS is a mechanical lock, not electronic, though it is built for integration into access control systems and offers optional REX, PRIV, DAJ and MKO status sensors.
11) We are wiring this opening for electric lock or unlock control - what mortise lock do I order instead?
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. The Command Access ML190 is a heavy duty motorized mortise lock with field selectable EL/EU operation on 24VDC, storeroom function. The BEST 45HW is a heavy duty wired electromechanical mortise lock running 12V or 24V. The TownSteel MSS is a mechanical lock that can be integrated into access control and offers optional REX, door ajar and mechanical key override sensors.
12) Is the TownSteel MSS Series heavy duty enough for a high traffic commercial door?
It is an ANSI Grade 1 heavy duty mortise lock built for commercial use, which is the top ANSI/BHMA durability tier and the normal specification for high traffic openings like main entries, offices and corridors. The wear parts back that up: stainless steel latch bolt, stainless steel guard bolt, stainless steel faceplate and stainless steel rocker type stop works.
13) What finishes does the TownSteel MSS mortise lock come in, and will it match my existing hardware?
Seven BHMA finishes: 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 you will find on most existing commercial openings. The levers are forged brass or cast zinc plated to match the finish symbol, so the lever and escutcheon come out consistent.
14) Is the TownSteel MSS an electronic lock, or does it need power?
No power required. The MSS is a mechanical mortise lock, keyed, with no electronics in it. If you need an electrified or standalone credential lock instead, the Command Access ML190 Series is a motorized mortise lock with field selectable EL/EU operation on 24VDC, and the BEST 45HW Series is a wired electromechanical mortise lock running 12V or 24V.
15) What is a comparable Grade 1 Entrance/Office mortise lockset if the TownSteel MSS is not the right fit?
The Cal-Royal NM8050 is the closest cross-brand match: a heavy duty Grade 1 Entrance/Office mortise lockset with auxiliary deadlatch, listed for 1-3/4 inch doors. If you need a different function instead of entry/office, the same Cal-Royal family covers classroom (NM8070), storeroom (NM8080) and privacy with deadbolt (NM8440), and the Accentra 8805FL is a Grade 1 storeroom mortise lock.
16) Should I use a sectional trim mortise lock or an escutcheon-style one?
Sectional trim, which is what the TownSteel MSS uses, splits the lever and the cylinder or thumb turn into separate plates on the door face. It is the lighter looking option and it gives you more room to work around adjacent hardware. A full escutcheon covers the whole run in one plate, which hides an older prep or previous trim footprint better. Hager's 3800 Series shows the split clearly, offering the same Grade 1 lock in both a rose version and an escutcheon version at the same 2-3/4 inch backset.
17) Does the TownSteel MSS mortise lock have a deadbolt?
No deadbolt. The MSS entry/office lock uses a 3/4 inch stainless steel latch bolt with a stainless steel guard bolt behind it, which deadlocks the latch against carding when the door is closed. If the opening needs a separate throw bolt, a mortise deadbolt like the Sargent 4874 double cylinder with a 2-3/4 inch backset is the usual add, or step to a lockset that integrates one such as the Cal-Royal NM8440.
18) Is there a non-keyed mortise lock with the same 2-3/4 inch backset as the TownSteel MSS?
Yes. The Hager 3850E is a Grade 1 office mortise lock with lever and escutcheon, non-keyed, on a 2-3/4 inch backset for 1-3/4 to 2-1/2 inch doors, and the Hager 3810E is a Grade 1 passage mortise lock with escutcheon on the same 2-3/4 inch backset. The TownSteel MSS uses a 2-3/4 inch backset as well but is keyed, single cylinder.
19) What is the difference between the TownSteel MSS and the Marks USA 21AC or 22AC mortise locks?
Door thickness and cylinder count are the split. The Marks 21AC and 22AC are entrance double cylinder ornamental iron mortise locks with a round knob, listed for 1 inch doors - that is narrow stile iron gate and storefront work. The TownSteel MSS is a single cylinder Grade 1 heavy duty commercial sectional mortise lock with a 2-3/4 inch backset and an 8 inch faceplate.
20) Can I order a Sargent 130KB thumbturn or a BEST 45HCA lock body as a substitute for the MSS?
No - those are not complete locksets. The Sargent 130KB is a standard duty mortise thumbturn in the 8200 Series and the 130W is a mortise thumbturn with a round backplate, both trim pieces only. The BEST 45HCAC is a heavy duty mortise lock body with public entrance function, a lock body without trim. The TownSteel MSS ships as a complete sectional trim lockset with lever, escutcheon, ANSI strike, split anti-friction latch bolt and brass thumb turn.
21) Does anything else offer an SFIC or interchangeable core option like the TownSteel MSS?
The Cal-Royal NM8080 is a heavy duty Grade 1 storeroom mortise lockset offered with an interchangeable core option. The TownSteel MSS can be ordered with a standard cylinder or with SFIC prep less core, so you can drop in your own small format core and key it to an existing system.
22) I need a residential-style decorative mortise entrance set, not a commercial one - what are my options?
Look at the Baldwin 6301 entry/apartment mortise lock body, offered knob by knob or lever by lever on a 2-1/2 inch backset for doors 1-3/4 inch and over, or the Baldwin 6310 entry/storeroom body on the same 2-1/2 inch backset for doors 1-3/8 inch and over. Note the backset difference - the TownSteel MSS is a commercial Grade 1 heavy duty lock on a 2-3/4 inch backset, so the mortise pocket prep is not the same.
23) The door only needs to latch, no key - is there a simpler mortise lock than the MSS?
Yes. The Schlage PM010 is a Grade 1 passage latch mortise lock, non-keyed, for 1-3/4 inch doors, the Falcon MA101 is a Grade 1 heavy duty mortise passage lock that is field reversible and fire rated, and the Hager 3810S is a Grade 1 passage mortise lock with rose trim on a 2-3/4 inch backset. The TownSteel MSS is keyed single cylinder with a thumb turn.
24) What should I use for a dorm or corridor door instead of the entry/office MSS?
The Sargent 7925 is a Grade 1 heavy duty dormitory exit function mortise lock with rose trim and a single cylinder deadbolt in the 7900 Series. The TownSteel MSS is an Entrance/Office function single cylinder lock with sectional trim and a brass escutcheon, so it does not carry the deadbolt-with-exit behavior a dormitory function provides.
25) Which alternatives carry a stated fire rating if the MSS is going on a rated opening?
Among comparable mortise products, the Schlage Electronics LEMD-GRW is a Grade 1 ENGAGE wireless mortise lock with a 3 hour fire rating, the LEBMB-ADD is a Grade 2 mobile-enabled mortise lock also at 3 hours, and the Falcon MA101 Grade 1 heavy duty mortise passage lock is fire rated. The TownSteel MSS is an ANSI Grade 1 heavy duty commercial mortise lock with a stainless steel split anti-friction latch bolt and guard bolt.
26) What is the difference between MSE Low and MSE Regular escutcheon on the TownSteel MSS lock?
Both are sectional trim escutcheons and the choice is about the plate proportion on the door face. The escutcheon is brass and measures 10-9/16 x 2-3/8 x 9/32 inches. Pick whichever matches the trim already on the other doors in the building, since mixing low and regular on adjacent openings is the thing people notice. Lever style is a separate choice: Artistic, Congr, Gala, Imperial, Quest, Regal, Sentinel or Tango.
27) Are the Emtek 3102 or 3104 mortise entrance locksets an alternative to the MSS?
They are not a functional substitute. The Emtek 3102 Memphis and 3104 Hamilton mortise entrance locksets are dummy function, as are the 3019 Brisbane and 3106 Manhattan - dummy trim does not latch or lock. The TownSteel MSS is a keyed single cylinder Grade 1 heavy duty operating lockset. If you want matching dummy trim on an inactive leaf, a dummy set like the Schlage L0170 half dummy Grade 1 mortise trim is the right kind of part.
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Does the TownSteel MSS-R-T-04-605 come with a warranty?
Absolutely. The TownSteel MSS-R-T-04-605 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-04-605?
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