TownSteel MSS Series Heavy Dut...
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$665.00
$660.27
TownSteel TownSteel MSS Series Storeroom with Deadbolt Function - Heavy Duty Sectional Mortise Lock , Double Cylinder TWS-MSS-35

TownSteel MSS Series Heavy Duty Sectional Mortise Lock - Storeroom Function with Double Cylinder Deadbolt

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Model: MSS-R-T-35-630
$665.00
$660.27
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$665.00
$660.27
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TownSteel MSS Series Heavy Duty Sectional Mortise Lock - Storeroom Function with Double Cylinder Deadbolt

The TownSteel MSS Series is an ANSI Grade 1 heavy duty sectional trim mortise lock built for single-opening, stand-alone commercial doors or integration into sophisticated access control systems. This double cylinder storeroom unit features a 2-3/4" backset, a 3/4" projection stainless steel split anti-friction latch bolt, and a durable stainless steel and brass construction designed for demanding daily use.

Key Features

  • Backset: 2-3/4" backset sized for standard commercial mortise door preparation.
  • ANSI Grade 1 Construction: Heavy duty mortise lock body rated for commercial-grade reliability and long service life.
  • Stainless Steel Latch Bolt: 3/4" projection, split, anti-friction stainless steel latch bolt for smooth, reliable latching.
  • Stainless Steel Faceplate: 1-1/4" x 8" stainless steel faceplate resists corrosion and wear in high-traffic areas.
  • Brass Escutcheon Trim: 10-9/16" x 2-3/8" x 9/32" brass escutcheon delivers a refined, durable sectional trim appearance.
  • Forged Lever Construction: Forged brass/cast zinc levers plated to match finish symbols for consistent appearance and durability.
  • Double Cylinder Deadbolt Control: Brass Classic Visible thumb turn standard, paired with a stainless steel rocker-type stop works mechanism.
  • Access Control Ready: Optional status sensors including REX (request-to-exit), PRIV (privacy), DAJ (door ajar), and MKO (mechanical key override) support integration into larger access control systems.

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: Double Cylinder
  • Commercial/Residential: Commercial
  • Keyed: Yes
  • Lock Function: Double 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
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings

Why TownSteel MSS?

TownSteel MSS Series mortise locks combine stainless steel latch, faceplate, guard bolt, and stop works components with a forged brass/cast zinc lever and brass escutcheon trim for professional-grade durability. Backed by an ANSI Grade 1 rating and sensor-ready design for REX, PRIV, DAJ, and MKO integration, this double cylinder storeroom lock is engineered for dependable performance in demanding commercial door applications.

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:
Storeroom
Product Category:
Mechanical Locks
Department:
Door Hardware

TownSteel MSS-R-T-35-630 – Frequently Asked Questions

1) Will the TownSteel MSS Series mortise lock fit a standard 2-3/4 inch backset door prep?
Yes. The MSS mortise lock is built on a 2-3/4 inch backset, which is the standard commercial mortise backset, and it uses a 1-1/4 by 8 inch stainless steel faceplate. If your existing pocket was cut for a standard ANSI mortise body with an 8 inch face, it drops into the same prep. The sectional escutcheon trim measures 10-9/16 x 2-3/8 x 9/32 inches in brass, so check that against the trim footprint you are covering.
2) Will this TownSteel storeroom mortise lock latch into my existing ANSI strike?
It should. The latch bolt throws 3/4 inch, is stainless steel, split and anti-friction, and the lock ships with an ANSI strike in plated or stainless steel. Anti-friction latching matters on doors with a closer and positive pressure, and the guard bolt (also stainless) deadlocks the latch against carding. If your frame already carries an ANSI 4-7/8 inch strike cutout, you can reuse the prep.
3) What does double cylinder storeroom with deadbolt mean on this TownSteel lock, and is it safe for an egress door?
Double cylinder means the deadbolt is key operated from both sides, so there is no thumbturn release on the inside for the bolt. Storeroom function keeps the outside lever locked at all times, with the key retracting the latch, while the inside lever always retracts the latch free. Because the deadbolt takes a key from both faces, double cylinder is normally restricted on required egress doors under local code, so it is the right choice for a storeroom, mechanical room, or stockroom rather than a primary exit. If you need a keyed outside lever with a thumbturn deadbolt inside, specify the single cylinder version instead.
4) Do I have to specify handing when ordering the TownSteel MSS mortise lock?
Yes, handing is required at order. You pick LH (left hand), RH (right hand), LHR (left hand reverse), or RHR (right hand reverse). Reverse bevel applies when the door swings out toward you from the secure side, which is common on stockroom and exterior service doors, so determine swing and which face is the keyed side before you order.
5) Can I get these TownSteel mortise locks keyed alike across a building?
Yes. Keying is a required selection: KD (keyed different) is standard, KA (keyed alike) groups multiple locks to one key, and a Key Code option lets you specify special keying to an existing system by entering the code at order. For facilities standardizing across many openings, KA or a supplied key code keeps the maintenance keyring short.
6) Does the TownSteel MSS mortise lock accept 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 if you run a Best-style SFIC system you order the housing prepped and drop in your own cores, keying the openings into your existing master plan. Choose Standard if you want the lock supplied with conventional cylinders.
7) What is a straight Grade 1 storeroom mortise lock equivalent to the TownSteel MSS Series?
Two close peers carry the same Grade 1 storeroom mortise designation. 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 MSS Series differs from both in that it is a storeroom function with a deadbolt and a double cylinder keyed function, so if the opening needs the separate deadbolt throw as well as the storeroom latch, the MSS is the one that covers both.
8) If I only need a double cylinder deadbolt and not a latch, what should I order instead of the MSS Series?
The Sargent 4874 is a double cylinder mortise deadbolt with a 2-3/4 inch backset, which matches the 2-3/4 inch backset the MSS Series uses. The Kaba Ilco 185 Series is another mortise deadbolt option and is supplied with no handing. Both are deadbolt only; the MSS Series combines the storeroom latch and the deadbolt in one lock body, so it is the choice when the door still needs a latching, keyed-outside function.
9) We want credential access on this door. What electronic mortise lock replaces a mechanical MSS Series?
The MSS Series is a mechanical lock, not electronic. For credential or code access in a mortise prep, the Schlage Electronics LEMD-GRW is a Grade 1 ENGAGE Series wireless mortise lock with a 125kHz proximity reader and a mobile-enabled deadbolt with LED, with a 3 hour fire rating. The Dormakaba E-Plex E5086 is a Grade 1 electronic pushbutton and card mortise lock in a back-to-back configuration. The Accentra NTM623-NR nexTouch Generation 3 mortise lock uses a capacitive touchscreen keypad with cylinder override and no deadbolt, so it is the one to skip if the deadbolt throw matters.
10) Is the Baldwin 6310 storeroom mortise lock a drop-in alternative to the TownSteel MSS Series?
Not as a direct swap. The Baldwin 6310 is an entry/storeroom knob-by-knob mortise lock body on a 2-1/2 inch backset for doors 1-3/8 inch and over, with a lever-by-lever version offered as the 6310190RRLS in right hand reverse. The MSS Series runs a 2-3/4 inch backset, so the door prep and the strike location differ between the two. Confirm the existing mortise pocket before treating either as a replacement for the other.
11) Can I use the MSS Series on an aluminum storefront or glass door?
The MSS Series is a heavy duty sectional mortise lock with a 1-1/4 by 8 inch stainless steel faceplate and a 2-3/4 inch backset, dimensions suited to a standard commercial mortise pocket rather than a narrow storefront stile. For those openings the Alarm Lock DL1300NW Trilogy Networx wireless electronic mortise lock is built for Adams Rite deadlatches, the Dormakaba E-Plex 2066 Series is a wide stile electronic pushbutton keyless mortise lock, and the Kaba Ilco BR Series is a glass door bottom rail lock.
12) What lever styles and finishes does the TownSteel MSS Series come in for matching existing doors?
Eight lever designs are offered: Artistic, Congr, Gala, Imperial, Quest, Regal, Sentinel and Tango. Finishes cover 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 back-of-house openings can match the lobby hardware. Two escutcheon heights are offered as well, MSE Low and MSE Regular.
13) Is this TownSteel lock heavy duty enough for a high traffic commercial storeroom?
It is an ANSI Grade 1, heavy duty commercial mortise lockset, which is the top durability tier for door hardware and the usual specification for schools, hospitals, and multifamily back-of-house. Stop works are stainless steel rocker type and the latch and guard bolt are stainless as well.
14) Is the TownSteel MSS a keypad or card reader lock?
No. The MSS is a purely mechanical, key operated mortise lock with no electronics. If you need credential access on a mortise prep, look at the Schlage CO-100 standalone electronic mortise lock, the Dormakaba E-Plex 2066 pushbutton mortise lock, or the BEST 45HZ EZ Series keypad mortise lock with key override.
15) I only need a deadbolt on this door, not a latch. Is the TownSteel MSS the right part?
No. The MSS is a full lockset with lever trim, a 3/4 inch anti-friction latch bolt and a deadbolt together. For a deadbolt alone on a mortise prep, the Sargent 4874 is a double cylinder mortise deadbolt on the same 2-3/4 inch backset, and the Kaba Ilco 185 Series mortise deadbolt is offered with no handing required.
16) Is a Schlage L0170 or Falcon MESC600DT a substitute for the MSS Series storeroom mortise lock?
No. The Schlage L0170 is a half dummy trim, a Grade 1 mortise non-keyed lever lock for 1-3/4 inch doors, and the Falcon MESC600DT is dummy escutcheon lever trim for M9900 Series exit devices. Both are dummy function with no latching or keying at all. The MSS Series is a keyed storeroom lock with a double cylinder function, so the dummy trims only make sense on the inactive leaf of a pair, never as the locking half.
17) What mortise lock should I use for an office or entrance door where the MSS storeroom function is too restrictive?
Storeroom function on the MSS Series keeps the outside lever locked at all times. For an office door that needs to be left unlocked during business hours, the Cal-Royal NM8050 is a Grade 1 office/entrance mortise lockset with an auxiliary deadlatch for 1-3/4 inch doors, and 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 inch to 2-1/2 inch doors. The 3850E is non-keyed while the NM8050 is a keyed entrance function.
18) Can I order just a mortise lock body without trim instead of the complete MSS Series lockset?
Yes, if the door already has usable trim. The BEST 45H Series is a heavy duty mortise lock body with public entrance function and field reversible operation, and the BEST 45HCA Series is a heavy duty mortise lockbody with intruder function. Those are lock bodies. The MSS Series ships as a complete heavy duty sectional mortise lockset with sectional trim, an escutcheon measuring 10-9/16 by 2-3/8 by 9/32 inch in brass, and a choice of lever including Artistic, Gala, Imperial, Quest, Regal, Sentinel and Tango.
19) How does the Sargent 7925 compare to the MSS Series for a dormitory corridor door?
The Sargent 7925 is a Grade 1 heavy duty dormitory exit function mortise lock in the 7900 Series with rose trim and a single cylinder deadbolt. The MSS Series is also Grade 1 heavy duty but uses a storeroom function with a double cylinder keyed function and sectional escutcheon trim rather than a rose. Pick the 7925 where the exit-function behavior and a thumbturn-side deadbolt are wanted, and the MSS where both sides are to be key-operated.
20) Which mortise lock do I use for a restroom or bedroom where the MSS Series double cylinder is not appropriate?
A privacy function is the right call there. 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 1-3/4 inch to 2 inch doors. Both operate from the inside without a key. The MSS Series is keyed with a double cylinder function, which is not a code-appropriate choice for a single-occupant restroom.
21) What is the difference between the MSS Series and the Command Access ML190 storeroom mortise lock?
Both are heavy duty storeroom function mortise locks. The Command Access ML190 Series is a motorized mortise lock with field selectable EL/EU operation running on 24VDC, so it requires power and a transfer hinge or door loop. The MSS Series is mechanical and carries no electronic operation, though it is built for access control integration and offers optional status sensors including REX, privacy, door ajar and mechanical key override.
22) What is a non-keyed passage mortise lock to pair with the MSS Series on the same corridor?
The Falcon MA101 is a Grade 1 heavy-duty mortise passage lock with field reversible operation and a fire rating, the Hager 3810E is a Grade 1 passage mortise lock with escutcheon on a 2-3/4 inch backset for 1-3/4 inch to 2-1/2 inch doors, with the 3810S being the rose-trim version, and the Schlage PM010 is a Grade 1 non-keyed passage latch mortise lock for 1-3/4 inch doors. The 3810E shares the 2-3/4 inch backset the MSS Series uses, and its escutcheon trim is the closer visual match to the MSS sectional escutcheon.
23) Are the Marks USA 21AC and 22AC double cylinder mortise locks an alternative to the MSS Series?
They serve a different door. The Marks USA 21AC and 22AC are entrance double cylinder ornamental iron mortise locks with a round knob, both listed for a 1 inch door thickness. The MSS Series is a heavy duty Grade 1 commercial mortise lock with a 2-3/4 inch backset and lever trim. Use the 21AC or 22AC on thin ornamental iron gates and the MSS on standard commercial door leaves.
24) Would a cylindrical lock work in place of the MSS Series mortise lock?
Only if you are changing the door prep. The MSS Series is a mortise lock type requiring a mortise pocket and taking a 1-1/4 by 8 inch stainless steel faceplate. The Schlage PC10 is a Grade 1 passage cylindrical lock, non-keyed with rose, for 1-3/4 inch doors, and it uses a bored cylindrical prep instead. Swapping between the two means new door machining or a filler plate, so match the prep already cut in the door.
25) Is the MSS sectional trim or escutcheon trim, and does that change the door prep?
The MSS uses sectional trim, meaning the lever and cylinder mount on separate plates rather than one long backplate. The escutcheon supplied measures 10-9/16 x 2-3/8 x 9/32 inches in brass and comes in two heights, Low or Regular. Sectional trim covers less of the door face, so if you are swapping out an older full escutcheon lock, confirm the old plate's footprint is not leaving exposed paint or fastener holes.
26) Is there a drilling template for installing the TownSteel MSS mortise lock?
Yes, TownSteel publishes an MSS installation template, linked from the product resources, that gives the mortise pocket and cross-bore layout. Cut the pocket for the 2-3/4 inch backset and the 8 inch faceplate, and confirm handing before routing since the lock is handed at order.
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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-35-630 come with a warranty?
Absolutely. The TownSteel MSS-R-T-35-630 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-35-630?
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