Marks USA MAR175DT 175DT Full ...
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$66.49
Marks USA 175DT Full Dummy Trim - Grade 2 Survivor Series, American Lever

Marks USA MAR175DT 175DT Full Dummy Trim Cylindrical Leverset - Grade 2 Survivor Series, American Lever, ADA Compliant

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Model: 175DT-26D
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Marks USA 175DT Full Dummy Trim Cylindrical Leverset — Grade 2 Survivor Series, American Lever

The Marks USA 175DT Full Dummy Trim is part of the Grade 2 Survivor Series, engineered for commercial environments where durability and long-term performance are essential. This cylindrical leverset features a solid cast Zamac American lever with a unique "clutch" mechanism that disengages the lever from internal components when locked, eliminating lever droop and reducing internal wear for a low-maintenance solution. Supporting door thicknesses from 1-5/8" to 1-7/8" (with spacer K1904 available for 1-3/8" doors), and fire-rated for up to 3 hours, the 175DT delivers flexibility and reliability across demanding applications. ANSI/BHMA Grade 2 certified and UL Listed, it meets the rigorous standards required for institutional and commercial use.

Key Features

  • Door Thickness Compatibility: Supports door thicknesses from 1-5/8" to 1-7/8"; spacer K1904 available for 1-3/8" doors for versatile installation options.
  • Backset Options: Standard 2-3/4" backset with optional 2-3/8" and 5" backset configurations to accommodate a variety of door preparations.
  • Clutch Mechanism Design: Unique "clutch" mechanism disengages levers from the retractor and internal components when locked, allowing free swing without resistance — eliminating lever droop and minimizing internal wear.
  • Heavy-Duty Construction: Solid cast Zamac lever with a robust cylindrical lock chassis featuring cast retractors on bronze roller bearings, supporting millions of cycles of reliable operation.
  • Steel Latch with Stainless Steel Nose: Equipped with a steel latch, 1/2" throw, and a durable stainless steel nose for long-lasting performance in high-traffic settings.
  • Thru-Bolted Spring-Loaded Roses: Thru-bolted, spring-loaded roses provide enhanced security and a secure, stable mounting on the door.
  • IC Core Compatibility: Available in various interchangeable core formats including SFIC, Corbin Russwin, Medeco, Schlage, Yale, and more for flexible keying system integration.
  • 3-Hour Fire Rating: Fire-rated for up to 3 hours, meeting code requirements for fire-rated door assemblies in commercial and institutional applications.
  • ADA Compliant: Meets ADA accessibility requirements, making it suitable for public and institutional facilities requiring compliant hardware.

Certifications & Compliance

  • ANSI/BHMA Grade 2
  • UL Listed
  • ADA Compliant
  • 3-Hour Fire Rating
  • ANSI Function F87 — Asylum/Institution/Utility

Technical Specifications

  • Product Group: Mechanical Locks
  • Product Subgroup: Bored Locksets
  • ANSI/BHMA: ANSI/BHMA, UL Listed
  • Function Description: Deadlocking latch bolt operated by key in lever from either side. Both levers are always inoperable.
  • Front Size: 1-1/8" x 2-1/4"
  • ADA Compliant: Yes
  • Keyed: Yes
  • ANSI Function: F87
  • Product Function: Asylum/Institution/Utility
  • Door Thickness Range: 1-3/4"
  • Strike Classification: ANSI, 1-1/4" x 4-7/8", 1-1/4" Lip, Square Corner
  • Product Category: Mechanical Locks
  • Department: Door Hardware

Typical Applications

  • Institutional and Asylum Facilities
  • Healthcare and Medical Institutions
  • Educational Facilities and Schools
  • Commercial Office Buildings
  • Government and Municipal Buildings
  • Multi-Tenant Residential Properties
  • Industrial and Warehouse Facilities

Why Marks USA 175DT?

Marks USA 175DT Survivor Series leversets are built for the most demanding commercial and institutional environments, featuring a solid cast Zamac lever, bronze roller bearing retractors rated for millions of cycles, and a patented clutch mechanism that virtually eliminates lever droop and internal wear. With ANSI/BHMA Grade 2 certification, UL Listing, ADA compliance, and a 3-hour fire rating, the 175DT delivers the professional-grade performance and code compliance that architects, specifiers, and facility managers require.

Manufacturer Resources

Marks USA Product Catalog

Product Specs

Latch Throw:
1/2"
Grade:
Grade 2
Product Group:
Mechanical Locks
Product Subgroup:
Bored Locksets
Product Type:
Cylindrical Locks
Subcategory:
Cylindrical Locks
ANSI/BHMA:
ANSI/BHMA, UL Listed
Commercial/Residential:
Commercial
Lock Type:
Cylindrical
Function Description:
Deadlocking latch bolt operated by key in lever from either side. Both levers are always inoperable.
Front Size:
1-1/8” x 2-1/4”
ADA Compliant:
Yes
Keyed:
Yes
ANSI Function:
F87
Product Attribute:
Cylindrical Locks
Product Function:
Asylum/Institution/Utility
Door Thickness Range:
1-3/4"
Strike Classification:
ANSI, 1-1/4" x 4-7/8", 1-1/4" Lip, Square Corner
Product Category:
Mechanical Locks
Backset (Distance):
2-3/4"
Department:
Door Hardware

Marks USA 175DT-26D – Frequently Asked Questions

1) What does the F87 asylum function on the Marks USA 175DT actually do at the door?
F87 is the asylum/institution/utility function: the deadlocking latch bolt is operated by key in the lever from either side, and both levers are always inoperable. Nobody gets through without a key on either face, which is why it shows up on utility closets, mechanical rooms, and secure institutional openings rather than on a normal office door.
2) Will the Marks USA 175DT fit a standard 1-3/4 inch commercial door?
Yes. The 175DT is specified for 1-3/4 inch door thickness, which is the standard commercial door. It's a cylindrical (bored) chassis, so it goes into a normal 161 bored prep rather than a mortise pocket.
3) What backset does the Marks USA 175DT leverset use, and will it hit my existing bore?
Standard backset is 2-3/4 inches, the usual commercial dimension. If your door was prepped at 2-3/8 inches, that's the residential-pattern backset and the standard chassis won't line up, so the bore centerline has to match before you order.
4) Can I reuse the strike already in my frame with the Marks 175DT?
The 175DT is supplied to the ANSI strike pattern: 1-1/4 inch x 4-7/8 inch with a 1-1/4 inch lip and square corners. If your frame is already ANSI-prepped, which most hollow metal commercial frames are, the strike drops straight in. The latch itself is a 1/2 inch throw deadlocking latch, and the lock front measures 1-1/8 x 2-1/4 inches, so check your existing edge mortise against that front size before reusing the door prep.
5) Is the Marks USA 175DT approved for a fire rated door opening?
It is UL Listed and carries ANSI/BHMA certification, with a 3 hour fire rating stated for the 175DT. The deadlocking latch and positive latching action are what make it usable on a labeled door assembly, so it suits institutional corridors and stairwell-adjacent utility doors that need rated hardware.
6) What do I have to specify when ordering the Marks 175DT, and what keying options are there?
Finish comes in US26D satin chrome. Keying is a required choice: keyed different, keyed alike, or none if you're ordering less core to drop in your own. The lock is keyed on both sides by design, and Marks offers it in a range of interchangeable core formats including SFIC, Corbin Russwin, Medeco, Schlage and Yale, so it can be folded into a master key system you already run in the building.
7) What is the closest equivalent to the Marks USA 175DT dummy lever from another manufacturer?
The Marks USA 175DT is a Grade 2 cylindrical dummy trim leverset with an American lever on a thru-bolted, spring-loaded rose. The closest non-operating lever trim elsewhere is the Dorma C501 single dummy lever lockset, also rated Grade 2 with a Dummy function, and the Orca Hardware OCL2170 Grade 2 half dummy lever. Both are fixed levers with no latch, same as the 175DT concept; the difference is the Marks unit is Survivor Series trim built around the same rose and lever profile used on its keyed and passage siblings, so it matches visually across a run of doors that already carry Marks 175 series hardware.
8) What is the difference between a full dummy trim like the Marks 175DT and a single or half dummy lever?
A full dummy trim mounts a fixed lever on both faces of the door, which is what the Marks USA 175DT provides. The Dorma C501 and the Orca Hardware OCL2170 are both catalogued with a Dummy function but as single dummy and half dummy respectively, meaning one lever on one face only. For a pair of doors or an active leaf where both sides need a pull, the 175DT covers both faces in one order; for a closet or inactive leaf that is only ever pulled from the corridor side, a single or half dummy covers it.
9) I need the lever to actually retract a latch, not just sit there. What should I order instead of the Marks 175DT?
The 175DT is trim only, so it will not retract a latch. For a latching, non-locking lever, the Cal-Royal CAL30 is a Grade 1 passage lockset carrying a Passage/Hall/Closet function and covering doors 1-3/8 inch to 2 inch, and the Orca Hardware OCL210 is a Grade 2 medium duty passage cylindrical lockset. Dorma also lists the CL701 as a Grade 2 non-keyed lever with a Passage/Hall/Closet function. Any of the three gives an operating lever where the 175DT gives a fixed one.
10) Is Grade 2 enough for a school or hospital corridor, or should I be buying Grade 1?
Grade 2 covers most commercial and institutional traffic, and the 175DT Survivor Series adds cast retractors on bronze roller bearings plus a clutch that disengages the lever from the retractor when locked, so forcing a locked lever doesn't chew up the internals or leave the lever drooping. Where a spec sheet calls out Grade 1 outright, look at a Grade 1 cylindrical such as the Cal-Royal CAL30 Calypso or the Dorma C150 instead; the Marks will not satisfy a hard Grade 1 requirement.
11) Does the Marks USA 175DT meet ADA requirements for lever hardware?
Yes, it's ADA compliant, with an American lever style rather than a knob. That matters on public-facing and institutional openings where operable hardware has to work without tight grasping or twisting of the wrist.
12) I need an electronic keypad lock on a similar cylindrical prep instead of a keyed institutional lever. What else is there?
Same bored chassis footprint, different access method. The Alarm Lock Trilogy T2 DL2700 is a Grade 1 standalone keypad entrance lock handling 100 user codes and takes IC/SFIC cores. The TownSteel XCE-2000 is a Grade 1 keypad classroom lockset for 1-3/4 to 2 inch doors, and the Schlage NDEB ENGAGE is a Grade 1 Bluetooth wireless cylindrical for 1-5/8 to 2 inch doors. Go that route when you want audit or code management; stay with the 175DT when the opening just needs a key on both faces and no batteries.
13) If I only need trim on the door with no latching at all, is the Marks 175DT the right part?
No. The 175DT is a keyed, latching institutional lockset with a deadlocking latch bolt, not a non-latching pull trim. For a true dummy lever, look at the Orca OCL2170 Grade 2 half dummy, the Dorma C501 single dummy for 1-3/8 to 1-3/4 inch doors, or the Dorma CL701 Grade 2 single dummy.
14) Which lockset matches the Marks 175DT trim if the same opening also needs a keyed lever?
For a door that needs key control rather than fixed trim, the Orca Hardware OCL250 is a Grade 2 entrance cylindrical lockset and the Stanley QCL150 is a Grade 2 entrance lever from the QCL100 series with a 2-3/4 inch backset latch and a 4-7/8 inch by 1-1/4 inch ASA strike, which is the same strike size the Marks 175 series calls out. The Dorma C853 is a Grade 1 single cylinder entry lever covering 1-3/8 inch to 2-1/4 inch doors if a higher grade is specified.
15) Can an electronic cylindrical lock be used in place of the Marks 175DT?
No, they solve different problems. The 175DT is dummy trim with no operating mechanism. Electronic cylindrical locks such as the Alarm Lock Trilogy T2 DL2700, the Schlage NDEB ENGAGE wireless lock, or the TownSteel XCE-2000 keypad lockset are all Grade 1 units that latch and control access at the door. Those belong on the opening that actually secures; the 175DT belongs on the leaf that only needs a matching pull, which is why dummy trim is commonly ordered alongside an access-control lock on a pair of doors rather than instead of one.
16) The restroom door needs to lock from the inside. Is the Marks 175DT the wrong choice?
Yes, dummy trim has no locking function at all. For a bath or restroom opening, the Cal-Royal CAL20 is a Grade 1 extra heavy duty privacy lock covering 1-3/8 inch to 2 inch doors, and the Orca Hardware OCL240 is a Grade 2 medium duty privacy cylindrical lockset. Both give the inside thumbturn the 175DT does not have, while the 175DT remains the right part for the adjacent fixed leaf or a false door face.
17) Will the Marks 175DT fit a door thicker than 1-3/4 inch, or should I look at something else?
The Marks USA 175DT is listed for 1-3/4 inch doors, with the 175 series supporting 1-5/8 inch to 1-7/8 inch and a K1904 spacer available for 1-3/8 inch. For thicker leaves, the Dorma C150 and C853 cover 1-3/8 inch to 2-1/4 inch and the Cal-Royal CAL20 and CAL30 cover 1-3/8 inch to 2 inch. Those are operating locksets rather than dummy trim, so on a thick door needing fixed trim only, confirm the leaf falls inside the Marks range before ordering.
18) Why does the Marks Survivor Series lever not sag the way other commercial levers do?
The clutch is the reason. When the lock is secured, the clutch disengages the lever from the retractor and internal components, so the lever swings free instead of loading the spring and chassis. That's what kills lever droop and the internal wear that usually follows it on high-abuse openings, which is why Marks aims this series at institutional traffic.
How fast can I get the Marks USA 175DT-26D 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 Marks USA 175DT-26D come with a warranty?
Absolutely. The Marks USA 175DT-26D 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 Marks USA 175DT-26D?
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
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