TownSteel MSS Series ANSI Grad...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$544.00
$540.13
TownSteel TownSteel MSS Series Front Door/Corridor Function - Heavy Duty Sectional Mortise Lock , Single Cylinder TWS-MSS-08

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

(No reviews yet) Write a Review

Model: MSS-R-T-08-626
$544.00
$540.13
Selected Finish is
Selected Lever Types is

In Stock (leaves warehouse same day if ordered before 3pm ET)

$544.00
$540.13
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

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

TownSteel's MSS Series ANSI Grade 1 Heavy Duty Sectional Mortise Lock delivers dependable corridor and front door function for commercial openings. Built with a 2-3/4" backset and a 1-1/4" x 8" stainless steel faceplate, this single-cylinder mortise lock suits single-opening, stand-alone installations or integration into access control systems. The stainless steel latch bolt offers a 3/4" projection with split, anti-friction construction, while forged brass/cast zinc levers and a 10-9/16" x 2-3/8" x 9/32" brass escutcheon complete the heavy-duty sectional trim.

Key Features

  • Backset & Faceplate: 2-3/4" backset with a 1-1/4" x 8" stainless steel faceplate for precise door preparation.
  • Heavy-Duty Latch Bolt: 3/4" projection stainless steel split latch bolt with anti-friction design for smooth, reliable latching.
  • Brass Escutcheon: 10-9/16" x 2-3/8" x 9/32" brass escutcheon for heavy-duty sectional trim styling.
  • Forged Lever Construction: Forged brass/cast zinc levers plated to match finish symbols, built for durable sectional trim.
  • Thumb Turn & Stop Works: Brass Classic Visible thumb turn paired with a stainless steel rocker-type stop works.
  • Stainless Steel Guard Bolt & ANSI Strike: Stainless steel guard bolt and plated/stainless steel ANSI strike resist tampering and ensure proper door alignment.
  • Access Control Ready: Optional REX (request-to-exit), PRIV (privacy), DAJ (door ajar), and MKO (mechanical key override) status sensors allow integration into access control systems.

Certifications & Compliance

  • ANSI/BHMA 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: Single Cylinder
  • Commercial/Residential: Commercial
  • Keyed: Yes
  • Lock Function: Single Cylinder
  • Product Attribute: Mortise Locks
  • Electronic: No
  • Product Function: Corridor
  • 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 pair ANSI/BHMA Grade 1 heavy-duty performance with stainless steel latch bolt, guard bolt, and faceplate components plus a forged brass/cast zinc lever assembly for lasting commercial durability. Engineered for demanding corridor and front door applications, this sectional mortise lock delivers professional-grade reliability for stand-alone 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:
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:
Corridor
Product Category:
Mechanical Locks
Department:
Door Hardware

TownSteel MSS-R-T-08-626 – Frequently Asked Questions

1) What backset and faceplate size does the TownSteel MSS Series mortise lock use, and will it drop into an existing mortise pocket?
The MSS mortise lock is built to a 2-3/4 inch backset with a 1-1/4 by 8 inch stainless steel faceplate, which is the standard commercial mortise pocket prep. If the door you're working on already carries a 2-3/4 inch backset mortise lock with a 1-1/4 x 8 inch face, the body goes back into the same pocket. Trim holes are the thing to check, since the escutcheon here measures 10-9/16 x 2-3/8 x 9/32 inches in brass and will cover a different footprint than a rose-trim lock.
2) What does corridor function mean on a mortise lock, and is it the right function for an apartment entry door?
Corridor function is the classic apartment or dormitory entry setup: the outside lever is locked and unlocked by the key, and the inside lever always retracts the latch for free egress. That makes the TownSteel MSS a good fit for unit entry doors off a shared corridor, where a tenant locks behind them but is never trapped inside. If you instead want the outside lever permanently locked and key-only entry with no way to leave it unlocked, a storeroom function lock like the Cal-Royal NM8080 or Accentra 8805FL is the one to order.
3) Do I have to specify handing when ordering the TownSteel MSS mortise lock?
Yes, handing is a required choice, and there are four: left hand, right hand, left hand reverse, and right hand reverse. Reverse handing covers doors that swing out toward you from the secure side, which is common on apartment and corridor openings. Stand outside the door on the key side, note which edge the hinges are on and which way the door swings, and pick from that.
4) Will the MSS latch bolt work with my existing ANSI strike?
The MSS ships with an ANSI strike in plated or stainless steel, and the latch bolt is a stainless steel split anti-friction type with 3/4 inch projection. A 3/4 inch throw into a standard ANSI 4-7/8 inch strike prep will engage normally, so an existing frame already cut for an ANSI mortise strike does not need to be re-prepped. The anti-friction latch matters on gasketed or door-closer-equipped openings, where it reduces drag as the latch meets the strike lip. A separate stainless guard bolt deadlocks the latch against carding.
5) Can I order the TownSteel MSS mortise lock for small format interchangeable core cylinders?
Two cylinder builds are offered: standard cylinder, or SFIC prep supplied less core. The SFIC prep version arrives without a core, so a facility running its own interchangeable core system can drop in the cores it already stocks and keep the opening on the existing master key system. Order the standard version if you want the lock keyed by us instead.
6) Can I get a group of these TownSteel mortise locks keyed alike for one building?
Keying is a required selection and there are three routes: keyed different, which is the standard, keyed alike for a run of locks that should all take one key, or special keying to a key code you supply. Property managers standardizing a floor or a maintenance master typically take keyed alike or a supplied code. The lock is single cylinder, so it is keyed on the outside only with a brass thumb turn inside.
7) What is the closest Grade 1 corridor/dormitory mortise lock to the TownSteel MSS Series front door function?
The Sargent 7925 is the nearest match in function. It is a Grade 1 heavy duty mortise lock with a dormitory exit function listed as Corridor/Dormitory, with a single cylinder deadbolt, which lines up with the MSS Series single cylinder corridor function and its Grade 1 heavy duty rating. The main difference is trim style: the Sargent 7925 uses rose trim, while the MSS Series is a sectional lock offered with an MSE escutcheon in low or regular height.
8) I need a storeroom function instead of a corridor function on a mortise door - what should I order?
The MSS Series is built as a corridor function, so for a storeroom opening look at the Accentra 8805FL, a Grade 1 storeroom mortise lock from the 8800 Series with an Arcadia lever, or the Cal-Royal NM8080, a heavy duty Grade 1 storeroom mortise lockset with an interchangeable core option. Both hold the same Grade 1 rating as the MSS Series, so the change is the lock function, not the duty level.
9) What is the electronic version of a corridor function mortise lock if I want access control instead of a key?
The Schlage L9092EU with 03A trim is a heavy duty corridor function mortise lock with an electric lock/unlock outside lever, keyed outside, request to exit, running on 12/24VDC for 1-3/4 inch doors. The MSS Series is a mechanical lock rather than an electronic one, though it is described as ready for access control system integration with optional status sensors including request-to-exit, privacy, door ajar and mechanical key override.
10) Will a Baldwin 6301 or 6310 mortise lock body drop into the same prep as the TownSteel MSS Series?
No. The Baldwin 6301 entry/apartment and 6310 entry/storeroom mortise lock bodies are 2-1/2 inch backset, while the MSS Series uses a 2-3/4 inch backset with a 1-1/4 inch by 8 inch stainless faceplate and ANSI strike. The different backset means the cross-bore and cylinder centerline do not line up, so the two are not interchangeable in an existing pocket without new prep.
11) Do I need to specify handing on a mortise lock, or are there field reversible alternatives?
The TownSteel MSS Series is ordered by hand, with LH, RH, LHR and RHR selections. If you would rather stock one part for either hand, the Falcon MA101 Grade 1 heavy duty mortise passage lock is field reversible, the BEST 45H public entrance mortise lock body has field reversible operation, and the Kaba Ilco 185 Series mortise locks are listed as no handing.
12) What lever styles and finishes does the TownSteel MSS sectional mortise lock come in?
Eight lever designs are offered: Artistic, Congr, Gala, Imperial, Quest, Regal, Sentinel, and Tango. Finishes run across seven BHMA numbers, 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 building already standardized on 626 satin chrome can add openings without a visible mismatch. The escutcheon also comes in two heights, MSE Low and MSE Regular.
13) Is this TownSteel mortise lock electronic, and what should I buy if I need access control on the opening?
The MSS is a mechanical, key operated mortise lock, not an electronic one. If the opening needs credentials or a keypad, look at an electrified or standalone electronic mortise lock instead: the Schlage L9092EU with request-to-exit is a corridor function electrified mortise on 12/24VDC, the Alarm Lock DL3500CR is a Grade 1 keypad mortise lock with 300 user codes, and the Schlage LEMD-GRW is a Grade 1 wireless ENGAGE mortise lock with a 125kHz proximity reader.
14) Does the TownSteel MSS have a deadbolt, or just a latch?
Latch only. The MSS uses a 3/4 inch stainless latch bolt with a stainless guard bolt that deadlocks it, plus stainless rocker type stop works, but there is no separate throw deadbolt. If the opening needs a true deadbolt, a mortise deadbolt like the Sargent 4874 double cylinder with a 2-3/4 inch backset, or a lockset that carries one such as the Cal-Royal NM8440, is the right direction.
15) What is the equivalent classroom function mortise lock if the corridor function is wrong for my opening?
For a classroom opening, the Corbin Russwin ML2003 is a Grade 1 mortise classroom lockset in the ML2000 Series rated for 1-3/4 inch doors, and the Cal-Royal NM8070 is a heavy duty Grade 1 classroom mortise lockset with an auxiliary deadlatch, also for 1-3/4 inch doors. Both are mechanical Grade 1 mortise locks like the MSS Series, so the difference is the function only.
16) Is there a non-keyed mortise lock I can use on the interior doors while keeping the MSS Series on the entry?
Yes. The MSS Series is keyed with a single cylinder, so for interior openings that need no key look at the Hager 3810E, a Grade 1 passage mortise lock with escutcheon and 2-3/4 inch backset, or the Hager 3840S, a Grade 1 privacy mortise lock on a 2-3/4 inch backset. The Falcon MA101 is another option, a Grade 1 heavy duty mortise passage lock with field reversible operation and a fire rating. All three share the 2-3/4 inch backset used by the MSS Series in the passage and privacy cases.
17) I want keypad entry on a multifamily corridor door instead of a cylinder - what are the mortise options?
Several keypad mortise locks cover that. 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 entry/egress electronic pushbutton and card mortise lock. The BEST 45HZ EZ Series is an electronic keypad mortise lock with key override. The MSS Series takes a key rather than a code, since it is a keyed single cylinder mechanical lock.
18) What looks like a substitute for the MSS Series mortise lock but is not a complete lockset?
A few items in the mortise family are components rather than full locksets. The BEST 45HCA Public Entrance item is a mortise lock body only, and the Sargent 130KB and 130W are mortise thumbturns. The Schlage L0170 is half dummy trim, a Grade 1 non-keyed lever trim with no latching function, and the Falcon MESC600DT is dummy escutcheon lever trim for M9900 exit devices. The MSS Series is a complete keyed mortise lockset with lock body, sectional trim, ANSI strike, latch bolt, guard bolt and thumb turn.
19) Can I use a mortise deadbolt instead of the MSS Series corridor lock on an entry door?
Only if the opening needs no latching lever set. The Sargent 4874 is a double cylinder mortise deadbolt on a 2-3/4 inch backset, matching the MSS Series backset but providing a deadbolt alone with no latch or lever. The Alarm Lock DL4500 is a Grade 1 electronic mortise deadbolt with 2,000 user codes and privacy keypad for 1-5/8 to 1-7/8 inch doors. The MSS Series is a single cylinder latching lockset with a 3/4 inch stainless steel anti-friction latch bolt and lever trim.
20) What mortise lock should I use for an office or entrance function rather than a front door corridor function?
The Cal-Royal NM8050 is a heavy duty Grade 1 office/entrance mortise lockset with an auxiliary deadlatch for 1-3/4 inch doors. The Hager 3850E is a Grade 1 office mortise lock with lever and escutcheon on a 2-3/4 inch backset, non-keyed, for 1-3/4 to 2-1/2 inch doors. The MSS Series differs in that it is keyed with a single cylinder and set up as a corridor function.
21) Is there a mortise option with a push/pull paddle instead of a lever for an ADA or behavioral health corridor?
Yes. The Marks USA 5PDN is a Grade 1 hospital passage mortise push/pull paddleset in the 195 Series, described as ligature resistant and ADA compliant in satin stainless steel. The TownSteel MSS Series is a lever product, offered in Artistic, Congr, Gala, Imperial, Quest, Regal, Sentinel and Tango lever styles, and it is a keyed single cylinder lock rather than a passage set.
22) What is the difference between sectional trim and escutcheon trim on a mortise lock like this?
Sectional trim breaks the outside face into separate pieces around the lever and cylinder rather than one long plate, so it shows less metal on the door and suits residential-feeling entries in multi-family buildings. The MSS uses sectional trim with a brass escutcheon measuring 10-9/16 x 2-3/8 x 9/32 inches, offered in Low and Regular heights. A full escutcheon lock such as the Hager 3810E covers more of the door face and is often chosen to hide old prep or wear marks.
23) What mortise lock matches the MSS Series finishes if I am standardizing a building on satin chrome or satin stainless?
The TownSteel MSS Series covers 605 bright brass, 606 satin brass, 622 matte black, 625 bright chrome, 626 satin chrome, 629 bright stainless and 630 satin stainless, so both 626 and 630 are available directly. Among the peers, the Marks USA 5PDN is supplied in satin stainless steel and the Schlage L9092EU 03A corridor mortise lock is a 626 part, if you need a push/pull or an electrified opening in the same building.
How fast can I get the TownSteel MSS-R-T-08-626 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-08-626 come with a warranty?
Absolutely. The TownSteel MSS-R-T-08-626 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-08-626?
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
Why buy the TownSteel MSS-R-T-08-626 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
!