TownSteel MSS Series Heavy Dut...
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$502.00
$498.42
TownSteel TownSteel MSS Series Storeroom/Closet Function - Heavy Duty Sectional Mortise Lock , Single Cylinder TWS-MSS-07

TownSteel MSS Series Heavy Duty Sectional Mortise Lock with Storeroom/Closet Function, Single Cylinder, 2-3/4" Backset

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Model: MSS-R-T-07-626
$502.00
$498.42
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In Stock (leaves warehouse same day if ordered before 3pm ET)

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TownSteel MSS Series Heavy Duty Sectional Mortise Lock with Storeroom/Closet Function, Single Cylinder, 2-3/4" Backset

The TownSteel MSS Series Heavy Duty Sectional Mortise Lock is an ANSI Grade 1 commercial-grade mortise lock engineered for storeroom/closet function with single cylinder keying. Featuring a 2-3/4" backset, a 3/4" projection stainless steel split anti-friction latch bolt, and durable sectional trim construction, this lock is designed to handle single opening, stand-alone applications or integrate into sophisticated access control systems using optional status sensors.

Key Features

  • Precision Backset & Faceplate: 2-3/4" backset paired with a 1-1/4" x 8" stainless steel faceplate for accurate, secure door preparation.
  • Durable Latch Bolt: 3/4" projection stainless steel split anti-friction latch bolt design ensures smooth, reliable latching in high-traffic applications.
  • Stainless Steel Guard Bolt: Reinforces the latch mechanism against tampering and forced entry attempts.
  • Brass Escutcheon: 10-9/16" x 2-3/8" x 9/32" brass escutcheon plate delivers a refined, commercial-grade appearance.
  • Forged Lever Construction: Forged brass/cast zinc lever parameters plated to match finish symbols for long-term durability.
  • Classic Visible Thumb Turn: Brass thumb turn, Classic Visible standard, for intuitive single cylinder operation.
  • Rocker-Type Stop Works: Stainless steel, rocker-type stop works support consistent mechanical performance over time.
  • Access Control Ready: Optional status sensors including REX (request-to-exit), PRIV (privacy), DAJ (door ajar), and MKO (mechanical key override) allow integration into sophisticated access control systems.
  • ANSI Strike: Plated/stainless steel ANSI strike for compatible, durable frame preparation.

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: Storeroom
  • Product Category: Mechanical Locks
  • Department: Door Hardware

Typical Applications

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

Why TownSteel MSS?

TownSteel MSS Series mortise locks deliver professional-grade reliability with a stainless steel latch bolt, stainless steel guard bolt, and forged brass/cast zinc lever construction built to an ANSI Grade 1 heavy duty rating. Engineered for demanding commercial storeroom and closet applications, this sectional mortise lock provides consistent, secure operation whether used stand-alone or integrated into a broader access control system.

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:
Storeroom
Product Category:
Mechanical Locks
Department:
Door Hardware

TownSteel MSS-R-T-07-626 – Frequently Asked Questions

1) Will the TownSteel MSS storeroom mortise lock latch into my existing ANSI strike prep?
The MSS storeroom lock runs a 2-3/4 inch backset with a 3/4 inch projection stainless steel split anti-friction latchbolt, and it ships with an ANSI strike in plated/stainless steel. If your frame is already prepped for a standard ANSI 4-7/8 inch strike and the door has a 2-3/4 inch backset mortise pocket, it drops straight in. The lock face is 1-1/4 x 8 inches, which is the standard commercial mortise faceplate size.
2) What does storeroom function mean on a mortise lock, and is it the right function for a supply closet?
Storeroom function means the outside lever is always locked and only the key retracts the latch; the inside lever always allows free egress. Nobody can leave the door unlocked by accident, which is why it is the usual choice for stock rooms, closets, janitor rooms, and electrical rooms. If you want the door to be lockable and unlockable from the outside at will, storeroom is the wrong function, look at an office/entrance function instead, such as the Cal-Royal NM8050 entrance/office mortise lockset.
3) Do I have to specify handing when ordering the MSS mortise lock?
Yes, handing is a required selection: LH, RH, LHR, or RHR. Stand outside the door on the key side; if the hinges are on your left it is left hand, on the right it is right hand, and if the door swings toward you it is the reverse version (LHR or RHR). Get this wrong on a sectional mortise lock and the lever and latch orientation will be backwards.
4) Can I get the MSS mortise lock prepped for my small format interchangeable core?
Two cylinder choices are offered: SFIC Prep, Less Core, or Standard. The SFIC version arrives with the prep only, so you supply and install your own small format interchangeable core to bring the lock onto your existing master key system. The Standard option comes as a keyed single cylinder lock.
5) I'm replacing locks on several storage doors. Can they all be keyed alike?
Keying is a required choice at order: KD (key different, the standard), KA (key alike, for multiple locks on one key), or a specific key code for special keying. For a run of closets in one building where maintenance carries a single key, choose KA. If you already run a master key system, the SFIC prep less core version lets your locksmith pin your own cores instead.
6) What is a direct cross for the TownSteel MSS storeroom mortise lock from another manufacturer?
Two Grade 1 storeroom mortise locks cross to the TownSteel MSS: the Accentra 8805FL, a Grade 1 storeroom mortise lock in the 8800 Series supplied with the Arcadia lever, and the Cal-Royal NM8080, a Grade 1 heavy duty storeroom mortise lockset offered with an interchangeable core option for 1-3/4 inch doors. The MSS itself is a Grade 1 heavy duty single cylinder storeroom mortise lock with a 2-3/4 inch backset, 3/4 inch stainless steel anti-friction latch and 1-1/4 x 8 inch stainless faceplate, so confirm the strike and faceplate prep in the door before crossing either way.
7) I need a classroom function mortise lock instead of storeroom - what should I order?
The TownSteel MSS covered here is storeroom/closet function only. For classroom function in a Grade 1 mortise, the Cal-Royal NM8070 is a heavy duty Grade 1 classroom mortise lockset for 1-3/4 inch doors, and the Corbin Russwin ML2003 is a Grade 1 mortise classroom lockset in the ML2000 Series, also listed for 1-3/4 inch doors. Both keep the mortise pocket and case format, so the door prep carries over.
8) Will a Baldwin 6310 storeroom mortise lock work as a substitute for the TownSteel MSS?
Not without changing the door prep. The Baldwin 6310 entry/storeroom mortise lock body uses a 2-1/2 inch backset and is listed for 1-3/8 inch doors and over, while the TownSteel MSS is built on a 2-3/4 inch backset with a 1-1/4 x 8 inch faceplate. The Baldwin is a residential-style knob-by-knob set; the MSS is specified commercial Grade 1. If the existing pocket is cut for 2-3/4, stay with a 2-3/4 backset lock such as the MSS.
9) If I am standardizing a building on one storeroom lock, how do the TownSteel MSS and Cal-Royal NM8080 differ for keying?
Both are Grade 1 storeroom mortise locksets. The Cal-Royal NM8080 is offered with an interchangeable core option and is listed for 1-3/4 inch doors. The TownSteel MSS is ordered as standard cylinder or SFIC prep less core, with keyed different, keyed alike, or a supplied key code, plus a choice of low or regular escutcheon and eight lever styles in seven finishes. If the facility is already on small format cores, order MSS units as SFIC prep less core and pin them into your existing system.
10) Is this TownSteel mortise lock heavy duty enough for a high-traffic commercial door?
The MSS mortise lock is an ANSI Grade 1, heavy duty, commercial-rated lock. Grade 1 is the top ANSI/BHMA classification for durability and strength, which is what specifications call for on schools, hospitals, and multi-family common areas. Body internals use stainless steel for the latchbolt, guard bolt, faceplate, and rocker-type stop works.
11) How big is the escutcheon plate on the MSS sectional trim, and will it cover my old trim marks?
The brass escutcheon measures 10-9/16 x 2-3/8 x 9/32 inches, and two heights are offered, MSE Low and MSE Regular. On a narrow stile door check the 2-3/8 inch dimension against your available stile face before committing. If your existing trim was a round rose rather than a plate, the escutcheon will cover more of the door face, not less.
12) What finishes and lever styles can I get on the TownSteel MSS storeroom lock to match the other doors in the building?
Seven finishes are offered: 605 bright brass, 606 satin brass, 622 matte black, 625 bright chrome, 626 satin chrome, 629 bright stainless steel, and 630 satin stainless steel. Levers come in eight styles, Artistic, Congr, Gala, Imperial, Quest, Regal, Sentinel, and Tango. Levers are forged brass or cast zinc plated to match the finish symbol, so the lever and escutcheon read the same across a floor of doors. 626 satin chrome and 630 satin stainless are the two that usually match existing commercial hardware.
13) Is the TownSteel MSS an electronic or access-control lock?
No, the MSS storeroom lock is a mechanical, key-operated lock, not electronic. If you need credential or keypad access on a mortise prep, the comparable set includes options like the BEST 45HZ EZ Series keypad mortise lock with key override, the Schlage CO-100 standalone electronic mortise lock, or the Command Access ML190 motorized mortise lock in storeroom function running 24VDC.
14) What other Grade 1 storeroom mortise locks could I use instead of the TownSteel MSS?
Two direct alternatives in the same function and grade: the Cal-Royal NM8080 Grade 1 storeroom mortise lockset, which is listed for 1-3/4 inch doors and offers an interchangeable core option, and the Accentra 8805FL Grade 1 storeroom mortise lock from the 8800 Series with an Arcadia lever. The TownSteel MSS differentiates on trim, sectional escutcheon trim with a choice of eight lever designs and seven finishes rather than a single lever style.
15) Should I use a mortise lock like this or a cylindrical lock on a storage room door?
A mortise lock like the MSS needs a machined pocket in the door edge and gives you a Grade 1 heavy duty body with a separate guard bolt and anti-friction latch, which is what holds up on doors that get pulled hundreds of times a day. A cylindrical lock only needs bored holes and is faster to install or retrofit, for example the Schlage PC Series Grade 1 cylindrical. If the door is already mortise prepped, stay mortise; if it is bored for a cylindrical, converting means a new door or a wrap kit.
16) What do I use on a restroom or bedroom door where the MSS storeroom lock is wrong?
Storeroom function keeps the outside lever locked at all times and is not a privacy lock, so for a restroom or bedroom opening use a privacy mortise instead. 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 1-3/4 to 2 inch doors - the same backset the MSS uses, which keeps the cross-bore centerline consistent across a floor.
17) Is there a non-keyed mortise lock that matches the MSS if the opening does not need to lock?
Yes. The MSS is a keyed single cylinder lock, so on a passage or closet opening that never locks, look at the Falcon MA101, a Grade 1 heavy duty fire rated mortise passage lock with field reversible operation, or the Hager 3810E passage mortise lock with escutcheon and a 2-3/4 inch backset for 1-3/4 to 2-1/2 inch doors. The 3810E carries the same 2-3/4 backset as the MSS and uses escutcheon trim, so it visually pairs with MSS escutcheon openings on the same corridor.
18) If I want keypad or credential access on a storeroom door instead of a key, what replaces the MSS?
The MSS is a mechanical, non-electronic lock, so an electronic mortise is a different product line. Options in mortise format include the Schlage CO-100-MS standalone electronic mortise lock with keypad reader, the Alarm Lock DL3500CR Trilogy Grade 1 electronic mortise lock with 300 user codes, and the BEST 45HZ EZ Series electronic keypad mortise lock with key override. Electronic units bring battery or power and credential management that the key-only MSS does not require, so plan the access control scope before switching.
19) Can I use a Sargent 130KB or a Schlage L0170 in place of the MSS storeroom lock?
No - neither is a working storeroom lock. The Sargent 130KB is a standard duty mortise thumbturn, a trim piece only, and the Schlage L0170 is a Grade 1 half dummy trim with no latching function. The TownSteel MSS is a complete Grade 1 heavy duty keyed storeroom mortise lock with lever, escutcheon, latch and ANSI strike. Order those parts only when you need matching trim on an inactive leaf, not lock function.
20) What is the difference between the TownSteel MSS and the Sargent 7925 dormitory lock for an apartment corridor door?
The MSS is a Grade 1 heavy duty single cylinder storeroom lock: the outside lever stays locked and the key retracts the latch. The Sargent 7925 is a Grade 1 heavy duty corridor/dormitory exit function mortise lock in the 7900 Series with rose trim and a single cylinder deadbolt, so it adds a deadbolt and dormitory operation for a unit entry door. Pick the 7925 where a deadbolt is required at the opening and the MSS where a latch-only storeroom function is specified.
21) I only need a mortise lock body, not a full lockset with levers - is the MSS the right buy?
The TownSteel MSS ships as a complete sectional lockset with lever, escutcheon and trim, chosen by lever style and finish. If you are replacing only a failed case and reusing existing trim, a lock body is the better line item: the BEST 45H Series heavy duty mortise lock body in public entrance function is field reversible, and the BEST 45HCA heavy duty mortise lockbody covers intruder function. Verify the existing trim's hub and spindle before reusing it on a different manufacturer's case.
22) Is a Marks USA LA318GJ a reasonable alternative to the MSS on a classroom security opening?
They serve different openings. The Marks USA LA318GJ is a Grade 1 classroom security indicator mortise lockset for 1-3/4 inch doors, supplied with an ANSI strike and a steel escutcheon measuring 8-1/2 by 2-3/4 by 7/16 inches, so it gives teacher-side locking with a visual indicator. The TownSteel MSS is storeroom function with a brass escutcheon at 10-9/16 by 2-3/8 by 9/32 inches. Where lockdown from inside the room is required, the LA318GJ answers that; where the door must simply stay locked to the public, the MSS does.
23) Our access control spec calls for electric lock/unlock on the outside lever - what replaces the MSS there?
The MSS is mechanical and keyed, so an electrified mortise is the correct line. The Schlage L9092EU with 03A trim is a heavy duty electric lock/unlock outside lever mortise lock, keyed outside, with request-to-exit and 12/24VDC operation for 1-3/4 inch doors, and the Command Access ML190 is a heavy-duty motorized mortise lock in storeroom function with field selectable EL/EU operation on 24VDC. Both need power transfer at the hinge edge that the MSS does not.
24) Is there a template for machining the door for the MSS mortise pocket?
Yes, TownSteel publishes an MSS template, and it is linked in the product resources. Mortise prep is not something to eyeball: you need the pocket, the 2-3/4 inch backset cross-bores for the lever spindle and cylinder, and the 1-1/4 x 8 inch face cutout. Use the template on both faces so the sectional escutcheon holes line up.
25) Does the MSS storeroom lock have a thumbturn or deadbolt on the inside?
A brass thumb turn is part of the MSS trim, Classic Visible as standard. On storeroom function the inside lever gives free egress at all times, so the thumbturn is there for the auxiliary locking side of the lock rather than to hold the door locked against exit. If what you actually want is a separate keyed deadbolt on the opening, the Sargent 4874 double cylinder mortise deadbolt with a 2-3/4 inch backset is a separate-lock option.
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Does the TownSteel MSS-R-T-07-626 come with a warranty?
Absolutely. The TownSteel MSS-R-T-07-626 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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