TownSteel MSS Series ANSI Grad...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$374.00
$371.34
TownSteel TownSteel MSS Series Exit Function - Heavy Duty Sectional Mortise Lock , Non-Keyed TWS-MSS-31

TownSteel MSS Series ANSI Grade 1 Heavy Duty Sectional Mortise Lock, Non-Keyed

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Model: MSS-R-T-31-626
$374.00
$371.34
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$374.00
$371.34
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TownSteel MSS Series ANSI Grade 1 Heavy Duty Sectional Mortise Lock, Non-Keyed

The TownSteel MSS Series ANSI Grade 1 Heavy Duty Sectional Mortise Lock, Non-Keyed is built for single opening, stand-alone commercial applications and is also ready for access control system integration. This mortise lock features a 2-3/4" backset, a 3/4" projection stainless steel split anti-friction latch bolt, a 1-1/4" x 8" stainless steel faceplate, and a 10-9/16" x 2-3/8" x 9/32" brass escutcheon for dependable, heavy-duty commercial performance.

Key Features

  • Backset: 2-3/4" backset delivers precise, standardized installation for commercial mortise lock applications.
  • Latch Bolt: 3/4" projection stainless steel split anti-friction latch bolt for smooth, reliable latching.
  • Faceplate: 1-1/4" x 8" stainless steel faceplate for a durable, corrosion-resistant finish.
  • Escutcheon: 10-9/16" x 2-3/8" x 9/32" brass escutcheon provides substantial coverage and a refined commercial appearance.
  • Heavy-Duty Construction: Forged brass/cast zinc lever parameters plated to match finish symbols, a stainless steel guard bolt, and a stainless steel rocker-type stop works.
  • Sectional Trim Design: Supports single opening, stand-alone applications and integrates with sophisticated access control systems.
  • Optional Status Sensors: Configurable with REX (request-to-exit), PRIV (privacy), DAJ (door ajar), and MKO (mechanical key override) sensors for expanded functionality.
  • Thumb Turn: Brass, Classic Visible standard thumb turn for straightforward operation.

Certifications & Compliance

  • ANSI Grade 1 Heavy Duty Rating
  • 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: Non-Keyed
  • Commercial/Residential: Commercial
  • Keyed: Yes
  • Lock Function: Non-Keyed
  • Product Attribute: Mortise Locks
  • Electronic: No
  • Product Category: Mechanical Locks
  • Department: Door Hardware

Typical Applications

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

Why TownSteel MSS?

TownSteel MSS Series mortise locks deliver professional-grade reliability through ANSI Grade 1 heavy-duty construction, stainless steel latch and guard bolt components, and a forged brass/cast zinc lever assembly built for demanding commercial door openings.

Product Specs

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

TownSteel MSS-R-T-31-626 – Frequently Asked Questions

1) What backset does the TownSteel MSS Series mortise lock use, and will it drop into an existing mortise pocket?
The MSS Series mortise lock is built on a 2-3/4 inch backset, which is the standard commercial mortise backset, and the faceplate measures 1-1/4 x 8 inches in stainless steel. If the door is already prepped for a standard 2-3/4 inch backset mortise body with an 8 inch face, the pocket and edge prep line up. Use the manufacturer MSS template to confirm the cross-bore and trim hole spacing before cutting anything new.
2) What does exit function mean on this TownSteel mortise lock, and is it keyed?
Exit function here means free egress from the inside with no key on the outside. The MSS is a non-keyed lock, so there is no cylinder to order or key it into a system. The outside lever is controlled mechanically rather than by a key, and the inside lever always retracts the latch for egress. If you need key control on the outside, this is the wrong item and you want a keyed MSS or a keyed storeroom mortise lock instead.
3) Do I have to specify handing when ordering the TownSteel MSS mortise lock?
Yes, handing is a required choice: LH (left hand), RH (right hand), LHR (left hand reverse), or RHR (right hand reverse). The lock is not field reversible on the order form, so get the hand right off the opening. Stand outside the door: if the hinges are on your left and the door swings away, that is LH; hinges left and the door swings toward you is LHR.
4) If I need the outside lever electrically controlled rather than sensor-monitored, what replaces the TownSteel MSS?
The Command Access ML190 is a heavy-duty motorized mortise lock in storeroom function with field selectable fail safe or fail secure operation on 24VDC, the BEST 45HW 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 at 12/24VDC. The TownSteel MSS is mechanical and non-keyed, with sensor provisions only, so electrification of the lever is not part of it.
5) What should I use instead of the TownSteel MSS if the opening needs to be keyed from the outside?
The TownSteel MSS exit function lock is non-keyed. For a keyed outside lever on a Grade 1 mortise body, the Accentra 8805FL is a Grade 1 storeroom mortise lock in the 8800 Series with an Arcadia lever, the Cal-Royal NM8080 is a Grade 1 storeroom mortise lockset for 1-3/4 inch doors with an interchangeable core option, and the Corbin Russwin ML2003 is a Grade 1 classroom mortise lockset for 1-3/4 inch doors. Choose storeroom if the outside lever should stay locked at all times, classroom if staff key the outside lever to unlocked.
6) What is the closest equivalent to the TownSteel MSS exit function mortise lock from another manufacturer?
The Sargent 7925 is the nearest match in intent: it is a Grade 1 heavy duty mortise lock in the 7900 Series with a corridor/dormitory exit function and rose trim. The TownSteel MSS exit function lock is also Grade 1 heavy duty, but uses sectional escutcheon trim in either a low or regular escutcheon profile, and it is non-keyed. The Sargent 7925 includes a single cylinder deadbolt, so if the opening calls for a keyed deadbolt on the outside, the 7925 covers that where the non-keyed MSS does not.
7) We want credential access on the door. Does the TownSteel MSS do that, or do we need an electronic mortise lock?
The TownSteel MSS is a mechanical lock, not electronic; what it offers is sensor provisions such as request-to-exit, door ajar, privacy and mechanical key override so it can report into an access control system. If you want the credential reader in the lock itself, the Schlage CO-100-MS is a standalone Grade 1 heavy duty electronic mortise lock with a keypad reader in privacy function, the Schlage LEMD-GRW is a Grade 1 ENGAGE wireless mortise lock with a 125kHz proximity reader and a 3 hour fire rating, and the Dormakaba E-Plex E5086 is a Grade 1 pushbutton and card mortise lock for entry/egress. Those replace the credential side; the MSS relies on the access control system wired around it.
8) What is the difference between the MSE Low and MSE Regular escutcheon on the TownSteel MSS?
Both are sectional escutcheon trims for the same lock body; the choice is the plate height and profile on the door face. The standard escutcheon measures 10-9/16 x 2-3/8 x 9/32 inches in brass. Pick Low when you are matching a shorter plate already on adjacent openings, Regular for the full-height look. Since it is sectional trim rather than a full one-piece plate, the lever and the thumb turn mount separately on the door face.
9) What lever styles and finishes can I get on the TownSteel MSS exit function mortise lock?
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. Levers are forged brass or cast zinc plated to match the finish symbol, so a 626 lever matches a 626 escutcheon across the building. For property managers standardizing a corridor, 626 satin chrome and 630 satin stainless are the two that match most existing commercial hardware.
10) Is the TownSteel MSS mortise lock heavy duty enough for a school or hospital corridor?
It is an ANSI Grade 1 heavy duty mortise lock built for commercial use, which is the top ANSI/BHMA durability tier and the usual spec for institutional corridors. The working parts are stainless steel where it counts: split anti-friction latch bolt, guard bolt, rocker-type stop works, and the ANSI strike. The thumb turn is brass, Classic Visible as standard.
11) If the door only needs free passage in both directions, is there a simpler mortise lock than the TownSteel MSS?
Yes. For plain passage with no locking at all, the Schlage PM010 is a Grade 1 non-keyed passage latch mortise lock for 1-3/4 inch doors, and the Falcon MA101 is a Grade 1 heavy duty mortise passage lock with field reversible operation and a fire rating. The TownSteel MSS exit function lock is a different animal: it is built for an exit opening with a thumbturn on the inside, and it carries the sectional trim and optional status sensor provisions such as REX and door ajar for access control integration. If nobody ever needs to secure the door, the passage functions do the job with fewer moving parts.
12) Is a Schlage L0170 dummy trim a substitute for the TownSteel MSS mortise lock?
No. The Schlage L0170 is Grade 1 heavy duty half dummy trim in the L Series for 1-3/4 inch doors, meaning a fixed lever with no latch behind it. The TownSteel MSS exit function lock is a complete heavy duty Grade 1 mortise lock body with a 3/4 inch stainless steel anti-friction latch bolt, guard bolt, and a 1-1/4 by 8 inch stainless faceplate. Dummy trim suits an inactive leaf only; it will not latch a working door.
13) We already stock BEST 45H mortise bodies. How does the TownSteel MSS compare for a heavy duty exit opening?
The BEST 45H is a heavy duty mortise lock body in public entrance function and is field reversible, and the 45HCA intruder function body is also heavy duty. Both are lock bodies, so trim is selected separately. The TownSteel MSS exit function lock is a heavy duty Grade 1 sectional mortise lockset with the escutcheon, lever and thumbturn specified as part of the order, with eight lever styles and seven finishes from 605 bright brass to 630 satin stainless. Handing is selected at order on the MSS rather than reversed in the field.
14) For a restroom or bedroom door, is the TownSteel MSS exit function the right pick?
Exit function is aimed at an opening where the inside always releases and the outside is controlled, not at a privacy application. For privacy, 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 with a 2-3/4 inch backset for doors 1-3/4 to 2 inches. Both give the occupant-side locking a bath or bedroom needs. Note the TownSteel MSS also uses a 2-3/4 inch backset, so the door prep carries over to the Hager 3840S.
15) For a healthcare door that needs push/pull hardware, is there an alternative to the TownSteel MSS?
Yes. 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 suits behavioral health and patient areas where a lever is not acceptable. The TownSteel MSS exit function lock is a lever trim product, offered in eight lever styles and in 630 satin stainless steel among its finishes, and its levers are forged brass or cast zinc plated to the finish symbol.
16) Should I use a sectional trim mortise lock or an escutcheon plate lock?
Sectional trim, which is what the TownSteel MSS uses, mounts the lever and thumb turn as separate pieces on the door face rather than one continuous plate. It shows less metal and is the usual pick when you are matching a modern trim look or a narrower visible footprint. A full escutcheon lock covers old screw holes and prior prep better, which matters on a retrofit where the previous trim left marks. The MSS gives you both escutcheon heights, Low and Regular, within the sectional design.
17) Does an escutcheon-trim non-keyed Hager 3850E do the same job as the TownSteel MSS?
They share a shape but not a function. The Hager 3850E is a Grade 1 office mortise lock with lever and escutcheon, non-keyed, on a 2-3/4 inch backset for doors 1-3/4 to 2-1/2 inches. The TownSteel MSS is also non-keyed on a 2-3/4 inch backset with escutcheon trim, but it is an exit function lock and is built to accept status sensors including request-to-exit and door ajar for access control integration. Office function is intended for a door staff secures from inside; exit function is for controlled-entry, free-egress openings.
18) Can I use a mortise deadbolt like the Sargent 4874 in place of the TownSteel MSS?
Only if the opening needs nothing but a bolt. The Sargent 4874 is a double cylinder mortise deadbolt on a 2-3/4 inch backset from the 4870 Series, with no lever and no latch. The TownSteel MSS exit function lock carries a 3/4 inch anti-friction latch bolt, a guard bolt, rocker type stop works and a lever on both sides, so it latches the door closed and allows egress by lever. Pairing a deadbolt with a separate passage set is a different prep from a single mortise pocket.
How fast can I get the TownSteel MSS-R-T-31-626 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 TownSteel MSS-R-T-31-626 come with a warranty?
Absolutely. The TownSteel MSS-R-T-31-626 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-31-626?
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