TownSteel MSS Series ANSI Grad...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$637.00
$632.45
TownSteel TownSteel MSS Series Apartment/Exit/Public Toilet Function - Heavy Duty Sectional Mortise Lock , Double Cylinder TWS-MSS-09

TownSteel MSS Series ANSI Grade 1 Heavy Duty Sectional Mortise Lock with Double Cylinder, Apartment/Exit/Public Toilet Function

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Model: MSS-R-T-09-606
$637.00
$632.45
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$637.00
$632.45
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TownSteel MSS Series ANSI Grade 1 Heavy Duty Mortise Lock with Double Cylinder, Apartment/Exit/Public Toilet Function — 2-Year Manufacturer's Warranty

The TownSteel MSS Series is an ANSI Grade 1 heavy duty sectional mortise lock built for apartment, exit, and public toilet function applications in a double cylinder configuration for keyed security on both sides of the door. Designed for single opening, stand-alone installations or integration into sophisticated access control systems, this lockset features a 2-3/4" backset, a 1-1/4" x 8" stainless steel faceplate, a 3/4" projection stainless steel split anti-friction latch bolt, and a 10-9/16" x 2-3/8" x 9/32" brass escutcheon with forged brass/cast zinc levers plated to match the selected finish.

Key Features

  • Backset: 2-3/4" backset for standard commercial door preparation and straightforward installation.
  • Faceplate: 1-1/4" x 8" stainless steel faceplate resists corrosion and wear in high-traffic doorways.
  • Latch Bolt: 3/4" projection, stainless steel, split, anti-friction latch bolt reduces friction and extends service life.
  • Guard Bolt: Stainless steel guard bolt helps deter latch tampering for added security.
  • Escutcheon: 10-9/16" x 2-3/8" x 9/32" brass escutcheon provides a durable, finish-matched trim plate.
  • Lever Construction: Forged brass/cast zinc levers plated to match finish symbols for long-lasting commercial performance.
  • Thumb Turn & Stop Works: Brass Classic Visible thumb turn and stainless steel rocker-type stop works deliver smooth, dependable operation.
  • Access Control Ready: Optional status sensors including REX (request-to-exit), PRIV (privacy), DAJ (door ajar), and MKO (mechanical key override) support integration into sophisticated access control systems.
  • Manufacturer Warranty: Backed by TownSteel's 2-year manufacturer's warranty for added confidence and protection.

Certifications & Compliance

  • ANSI/BHMA Grade 1
  • 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: Apartment/Exit/Public Toilet
  • Product Category: Mechanical Locks
  • Department: Door Hardware

Typical Applications

  • Multi-Tenant Residential and Apartment Buildings
  • Public Restroom Facilities
  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Government and Municipal Buildings

Why TownSteel MSS?

TownSteel MSS Series mortise locks deliver ANSI/BHMA Grade 1 heavy duty performance with stainless steel latch bolt, guard bolt, and faceplate components engineered for demanding commercial environments. The sectional trim design and forged brass/cast zinc lever construction provide reliable, long-lasting operation whether installed as a stand-alone lock or integrated into a broader access control system with REX, PRIV, DAJ, or MKO status sensors. Engineered for apartment, exit, and public toilet applications, this double cylinder mortise lock is built to perform where dependable commercial-grade security is essential.

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:
Apartment/Exit/Public Toilet
Product Category:
Mechanical Locks
Department:
Door Hardware

TownSteel MSS-R-T-09-606 – Frequently Asked Questions

1) What does the Apartment/Exit/Public Toilet function on the TownSteel MSS mortise lock actually do at the door?
It's a double cylinder function, so both sides are keyed and there is no free-turning knob or lever to unlock from inside without a key. TownSteel lists it under the Apartment/Exit/Public Toilet function, the arrangement used on apartment corridor doors and public restrooms where the same opening needs controlled entry from the corridor side and a keyed operation on the other. If you need the inside always free for egress, this is the wrong function and you want a storeroom or office lock instead.
2) Will the TownSteel MSS mortise lock drop into an existing 2-3/4 inch backset mortise pocket with an ANSI strike?
Yes on both counts. The MSS is built on a 2-3/4 inch backset with a 1-1/4 x 8 inch stainless faceplate and ships with an ANSI strike in plated or stainless steel. That's the standard commercial mortise prep, so an opening already cut for an ANSI mortise lock should take it without new routing. The latch is a 3/4 inch projection stainless split anti-friction bolt with a stainless guard bolt, which is the normal throw an ANSI strike lip is cut for.
3) Do I have to specify handing on the TownSteel MSS mortise lock, or is it field reversible?
Handing has to be called out on the order. The MSS is ordered as LH, RH, LHR, or RHR, so you need to know which way the door swings and which side it's hinged before you buy. Stand outside the door (the keyed side): hinges left and pulling toward you is LH, hinges left and pushing away is LHR. If you want a mortise lock body you can flip on site instead, the BEST 45H heavy duty body is listed with field reversible operation.
4) Can I key a whole building of TownSteel MSS mortise locks alike?
Yes. Keying is a required selection: KD keyed different is the standard, KA keyed alike groups multiple locks to one key, and there's a Key Code option with a text field if you're matching an existing system in the building. For a property manager standardizing a floor or a whole property, KA on the order is what keeps one key working across the openings.
5) Does the TownSteel MSS mortise lock take small format interchangeable cores?
It can. The cylinder choice is either Standard or SFIC Prep, Less Core. If you pick SFIC prep, the lock is machined for a small format interchangeable core but no core is included, so you order cores and keys separately (or supply them from your existing system). Because this is a double cylinder function, an SFIC build needs a core on each side. If you don't run an SFIC system, take the Standard cylinder option.
6) What is a comparable Grade 1 mortise lock for an apartment entry if I do not need the double cylinder function of the TownSteel MSS?
The TownSteel MSS Series in Apartment/Exit/Public Toilet function is a Grade 1 double cylinder mortise lock. If a single-cylinder apartment entry is what the opening calls for, the Baldwin 6301 Entry/Apartment lever by lever mortise lock body carries an Entrance/Apartment function with a 2-1/2 inch backset and fits doors 1-3/4 inch and over. The Baldwin is a 2-1/2 inch backset lock body, while the MSS uses a 2-3/4 inch backset, so the door prep is not the same.
7) I need a storeroom function mortise lock instead of the apartment/exit function on the TownSteel MSS - what should I order?
The TownSteel MSS Series is built for Apartment/Exit/Public Toilet function, where the outside is keyed and the inside always releases. For a storeroom opening where the outside lever stays locked at all times, 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 storeroom mortise lockset for 1-3/4 inch doors with an interchangeable core option. The NM8080 IC option lines up with the SFIC prep, less core cylinder choice offered on the MSS.
8) Is a Sargent 4874 double cylinder mortise deadbolt a substitute for the TownSteel MSS double cylinder mortise lock?
No. The Sargent 4874 is a double cylinder mortise deadbolt on a 2-3/4 inch backset - a deadbolt only, with no latch or lever operation. The TownSteel MSS Series is a complete heavy duty mortise lockset with a 3/4 inch projection stainless steel anti-friction split latch bolt, guard bolt, levers and sectional escutcheon trim, also on a 2-3/4 inch backset. Use the 4874 when you are adding a separate deadbolt, not when you need the latching lockset.
9) Will a Marks USA 21AC or 22AC double cylinder mortise lock work where I would otherwise use a TownSteel MSS?
Only on very different doors. The Marks USA 21AC and 22AC are entrance double cylinder ornamental iron mortise locks with a round knob, both listed for 1 inch door thickness, which is narrow-stile ornamental iron work. The TownSteel MSS Series is a heavy duty commercial Grade 1 sectional mortise lockset with a 1-1/4 by 8 inch stainless steel faceplate and a 2-3/4 inch backset, sized for standard commercial doors. They are not interchangeable preps despite both being double cylinder.
10) Is this TownSteel mortise lock heavy enough for a high traffic apartment or institutional corridor?
It's an ANSI Grade 1 heavy duty commercial mortise lock. Grade 1 is the top ANSI/BHMA tier for cycles and strength, which is what you spec for multi-family corridors, schools, and public restrooms rather than a light commercial cylindrical lock. Latch bolt, guard bolt, faceplate, and stop works are all stainless steel; the levers are forged brass or cast zinc plated to the finish, and the escutcheon is brass.
11) How much room does the escutcheon on the TownSteel MSS need on the door face?
The MSS escutcheon measures 10-9/16 x 2-3/8 x 9/32 inches in brass, so you need a flat face area wider than 2-3/8 inches clear of glass stops or bead. On a narrow stile aluminum door that plate will not sit flat, and neither will the 8 inch faceplate fit a narrow stile pocket. There are two escutcheon styles to pick from, MSE Low and MSE Regular.
12) Is the TownSteel MSS an electronic or access control lock?
No, the MSS as sold here is a mechanical Grade 1 mortise lock, not electrified. If you need a mortise lock that ties into access control, look at electrified or standalone options: the Command Access ML190 Series is a motorized mortise lock with field selectable EL/EU operation on 24VDC, the BEST 45HW is a wired electromechanical mortise lock running 12V or 24V, and the Schlage CO-100 is a standalone keypad mortise lock.
13) I need a Grade 1 mortise lock but a different function than apartment/exit. What else is there?
Function drives the choice, so match the opening. For a storeroom door that always locks behind you, the Cal-Royal NM8080 and Accentra 8805FL are Grade 1 storeroom mortise locks. For a classroom, the Cal-Royal NM8070 and Corbin Russwin ML2003 are Grade 1 classroom mortise locksets. For a restroom or bedroom that needs privacy rather than a key both sides, the Cal-Royal NM8440 is a Grade 1 privacy mortise lockset with deadbolt and the Hager 3840S is a Grade 1 privacy mortise lock on a 2-3/4 inch backset. The TownSteel MSS is the double cylinder apartment/exit arrangement, which is a different animal.
14) Do I need to order a strike separately for the TownSteel MSS mortise lock?
No. An ANSI strike in plated or stainless steel is part of the MSS package, along with the 1-1/4 x 8 inch stainless faceplate. What you do need to settle separately is cylinders if you chose the SFIC prep version, since that ships less core, and your keying (KD, KA, or a key code) at the time of order.
15) What is the difference between the TownSteel MSS apartment function lock and the Sargent 7925 dormitory exit lock?
Both are Grade 1 heavy duty mortise locks. The TownSteel MSS Series is an Apartment/Exit/Public Toilet function double cylinder lock with sectional trim and a brass escutcheon measuring 10-9/16 by 2-3/8 by 9/32 inches. The Sargent 7925 is a Corridor/Dormitory exit function lock in the 7900 Series with rose trim and a single cylinder deadbolt. So the deciding factor is trim style and whether you want a double cylinder or a single cylinder deadbolt arrangement.
16) Which mortise lock should I use instead of the TownSteel MSS for a non-keyed passage or office door?
The TownSteel MSS Series is keyed on both sides as a double cylinder lock, so it is not a passage solution. For non-keyed openings, the Hager 3810E is a Grade 1 passage mortise lock with escutcheon on a 2-3/4 inch backset for 1-3/4 to 2-1/2 inch doors, the Falcon MA101 is a Grade 1 heavy duty fire rated mortise passage lock with field reversible operation, and the Hager 3850E is a Grade 1 non-keyed office mortise lock with lever and escutcheon on a 2-3/4 inch backset. The Hager escutcheon versions keep the same escutcheon trim look as the MSS, which uses escutcheon trim in low and regular heights.
17) For a public restroom door, is the TownSteel MSS or a privacy mortise lock the right choice?
The TownSteel MSS Series covers the public toilet application with a keyed double cylinder arrangement and a brass Classic Visible thumb turn as standard, which suits a restroom that facility staff need to key into. If the opening only needs a non-keyed privacy set, the Cal-Royal NM8440 is a Grade 1 privacy mortise lockset with deadbolt for 1-3/4 inch doors, and the Hager 3840S is a Grade 1 privacy mortise lock on a 2-3/4 inch backset for doors 1-3/4 to 2 inches. The MSS also uses a 2-3/4 inch backset, so the Hager matches on that prep dimension.
18) If I want keypad or credential access instead of a keyed TownSteel MSS mortise lock, what are the mortise alternatives?
The TownSteel MSS Series is a mechanical, non-electronic keyed mortise lock. For electronic access on the same mortise prep family, the Alarm Lock DL3500CR is a Grade 1 Trilogy electronic mortise lock with 300 user codes in classroom function for 1-5/8 to 1-7/8 inch doors, the Schlage CO-100-MS is a Grade 1 heavy duty standalone electronic mortise lock with a keypad reader in privacy function for 1-3/4 inch doors, and the Schlage LEMD-GRW is a Grade 1 ENGAGE wireless mortise lock with a 125kHz proximity reader and a 3 hour fire rating. Note the Alarm Lock door thickness range is narrower than the 1-3/4 inch doors the Schlage units list.
19) I only need the mortise lock body, not the levers and escutcheons - is there an alternative to the TownSteel MSS?
The TownSteel MSS Series ships as a complete sectional trim lockset with lever and escutcheon selections including Artistic, Congr, Gala, Imperial, Quest, Regal, Sentinel and Tango levers. If you are reusing existing trim and need only a lock body, the BEST 45HCAC is a heavy duty mortise lock body in public entrance function with field reversible operation, and the BEST 45HCAINL is a heavy duty mortise lockbody in intruder function. Both are bodies, so trim must be sourced separately.
20) What is the closest alternative to the TownSteel MSS for an entrance or office function opening?
The Cal-Royal NM8050 is a heavy duty Grade 1 office/entrance mortise lockset with an auxiliary deadlatch for 1-3/4 inch doors, and the BEST 45HCAC is a heavy duty mortise lock body in public entrance function with field reversible operation. The TownSteel MSS Series is Grade 1 heavy duty as well, but in Apartment/Exit/Public Toilet function with double cylinder keying, which locks and unlocks the outside lever by key rather than by a thumb turn or button.
21) Is a Schlage PM010 or PC10 a lower-cost swap for the TownSteel MSS mortise lock?
They solve a different opening. The Schlage PM010 is a Grade 1 non-keyed passage latch mortise lock for 1-3/4 inch doors, and the Schlage PC10 is a Grade 1 non-keyed passage cylindrical lock with rose - the PC10 is cylindrical, so it needs a bored door prep rather than a mortise pocket. The TownSteel MSS Series is a keyed double cylinder mortise lock with a 1-1/4 by 8 inch stainless faceplate and ANSI strike, so neither passage unit provides the security function the MSS does.
22) What lever styles and finishes can I get on the TownSteel MSS mortise lock to match the rest of my building?
Eight lever designs: Artistic, Congr, Gala, Imperial, Quest, Regal, Sentinel, and Tango. Finishes run 605 bright brass, 606 satin brass, 622 matte black, 625 bright chrome, 626 satin chrome, 629 bright stainless, and 630 satin stainless. 626 and 630 are the usual commercial defaults if you're matching existing corridor hardware. Levers are plated to match the finish symbol, so the escutcheon and lever come as a set.
23) What's the difference between the sectional trim on the TownSteel MSS and an escutcheon trim mortise lock?
Sectional trim means the lever and the thumb turn or cylinder mount on separate pieces rather than one full-length plate. TownSteel calls the MSS a sectional trim lock, and it ships with an escutcheon in MSE Low or MSE Regular plus a brass Classic Visible thumb turn as standard. Practically it covers less of the door face than a single long plate, which matters if you're replacing a lock that left a larger footprint behind and you need the old holes hidden.
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Does the TownSteel MSS-R-T-09-606 come with a warranty?
Absolutely. The TownSteel MSS-R-T-09-606 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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