Marks USA MAR175T 175T Corrido...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$280.88
$168.11
Marks USA 175T Corridor Lever Lockset - Grade 2 Survivor Series, American Lever, Cooridor

Marks USA MAR175T 175T Corridor Lever Lockset — Survivor Series, Clutch Mechanism, ADA Compliant, Grade 1

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Model: 175T-26D
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$280.88
$168.11
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Marks USA 175T Corridor Lever Lockset — Survivor Series, Clutch Mechanism, ADA Compliant

The Marks USA 175T is a Grade 1 Survivor Series Corridor Lever Lockset engineered for demanding commercial environments where durability and low maintenance are essential. Featuring a unique clutch mechanism, the levers disengage from the retractor and interior lock components when locked, allowing them to swing freely without resistance — eliminating lever droop and dramatically reducing wear on internal components. Designed for doors 1-5/8" to 1-7/8" thick (with optional K1704 spacer for 1-3/8" doors), this cylindrical lockset ships with a 2-3/4" backset and a MARKS "C" keyway 6-pin cylinder with 2 keys. ANSI/BHMA certified and UL Listed, it meets the rigorous demands of asylum, institution, and utility applications.

Key Features

  • Innovative Clutch Mechanism: When locked, levers disengage from the retractor and interior mechanisms, allowing free swing without resistance — eliminating lever droop and reducing long-term wear on lock components.
  • Door Thickness Compatibility: Accommodates doors 1-5/8" to 1-7/8" thick; use K1704 spacer for 1-3/8" doors for versatile installation across door types.
  • Backset & Latch Specifications: 2-3/4" backset with Latch #1134 featuring a 1-1/8" x 2-1/4" front, 1/2" throw, and stainless steel nose for reliable latching performance.
  • Solid Cast Zamac Levers: Levers are constructed from solid cast Zamac with a 1/2" return (except models 370 & 470), providing exceptional strength and a professional appearance.
  • Thru-Bolted Rose Design: 3-1/4" diameter roses are spring-loaded and secured with 2 #10 thru-bolts for a secure, tamper-resistant installation.
  • MARKS "C" Keyway Cylinder: 6-pin cylinder with MARKS "C" keyway and 2 keys included; ANSI Function F87 — deadlocking latch bolt operated by key in lever from either side with both levers always inoperable.
  • ASA Strike Included: Ships with Strike #1145 ASA strike, classified ANSI 1-1/4" x 4-7/8", 1-1/4" lip, square corner for standard door frame compatibility.
  • ADA Compliant: Lever design meets ADA accessibility requirements, making it suitable for public and commercial facilities requiring accessible hardware.

Certifications & Compliance

  • Grade 1 — ANSI/BHMA Certified
  • UL Listed
  • ADA Compliant
  • ANSI Function F87 — Asylum/Institution/Utility

Technical Specifications

  • Grade: Grade 1
  • Product Group: Mechanical Locks
  • Product Subgroup: Bored Locksets
  • Product Type: Cylindrical Locks
  • Subcategory: Cylindrical Locks
  • ANSI/BHMA: ANSI/BHMA, UL Listed
  • Commercial/Residential: Commercial
  • Function Description: Deadlocking latch bolt operated by key in lever from either side. Both levers are always inoperable.
  • 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
  • Department: Door Hardware

Typical Applications

  • Asylum and Institutional Facilities
  • Healthcare and Hospital Environments
  • Educational Institutions and Schools
  • Government and Municipal Buildings
  • Commercial Office Buildings
  • Utility and Maintenance Areas
  • Multi-Tenant Residential and Mixed-Use Properties

Why Marks USA 175T?

Marks USA 175T Survivor Series locksets are built around a patented clutch mechanism that sets them apart from conventional cylindrical lever locks — when locked, levers disengage entirely from internal components, eliminating the wear, lever droop, and maintenance cycles that plague standard lever sets. Constructed with solid cast Zamac levers, thru-bolted roses, and a stainless steel latch nose, the 175T delivers Grade 1, ANSI/BHMA-certified, UL Listed performance engineered for the most demanding commercial and institutional applications.

Manufacturer Resources

Marks USA Product Catalog

Product Specs

Latch Throw:
1/2"
Grade:
Grade 1
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 175T-26D – Frequently Asked Questions

1) What does the Marks USA 175T corridor lockset actually do when it's locked? Can anyone get in without a key?
The 175T is an ANSI F87 asylum/institution/utility function. Both levers are always inoperable, and the deadlocking latch bolt is retracted only by a key in the lever from either side. There is no free passage side. That means staff need a key in hand on both sides of the opening, so it is not appropriate for an egress door where occupants must leave without a key.
2) Will the Marks 175T fit a 1-3/8 inch door?
Not as it ships. The 175T is built for doors 1-5/8 inch to 1-7/8 inch thick, which covers the standard 1-3/4 inch commercial door. For a 1-3/8 inch door you need to add the K1704 spacer.
3) Will the Marks 175T drop into my existing door prep and strike?
It uses a 2-3/4 inch backset with a 1-1/8 x 2-1/4 inch latch front and a 1/2 inch throw, which is the common commercial bored prep. The included #1145 strike is ANSI 1-1/4 x 4-7/8 inch with a 1-1/4 inch lip and square corners, so if your frame already carries a standard ASA strike cutout the new strike drops straight in. If your existing openings are prepped 2-3/8 inch backset, this lock is not a direct swap.
4) Does the Marks 175T come with a cylinder and keys, or do I key it myself?
It ships keyed, with a 6-pin cylinder in the MARKS C keyway and two keys. On the order you choose keyed different, keyed alike, or None if you want it supplied less core for your own interchangeable core program.
5) Is the Marks 175T Grade 1 and does it meet ADA for a public building?
Grade 1 under ANSI/BHMA, UL Listed, and the lever design meets ADA accessibility requirements. That combination is what specifiers look for on healthcare, school, and government openings where the lock has to survive traffic and still pass an accessibility review.
6) I need a keyless version of the Marks USA 175T corridor lockset for the same institutional doors - what are my options?
The Marks USA 175T ships keyed with a 6-pin MARKS C keyway cylinder. For a keyless approach on comparable cylindrical prep, the Alarm Lock Trilogy T2 DL2700 is a Grade 1 standalone electronic cylindrical entrance lock with a digital keypad, 100 user codes and IC/SFIC compatibility, and the Alarm Lock T3 DL3075 is a Grade 1 electronic cylindrical lock that adds an audit trail. The TownSteel XCE-2000 is a Grade 1 heavy duty keypad cylindrical lockset in classroom function for doors 1-3/4 inch to 2 inch. Credential management replaces key control in all three, which is the real decision.
7) What is the clutch mechanism on the Marks Survivor Series and why does it matter for maintenance?
When the lock is in its locked state, the levers disengage from the retractor and the interior lock components, so they swing freely instead of loading the internal parts. That is what kills lever droop and the repeat service calls that come with it. For a facility running hundreds of openings with heavy abuse, it is the difference between replacing levers and leaving them alone.
8) Should I use a mechanical lockset like the Marks 175T or go electronic on an institutional door?
The 175T is purely mechanical, key operated from both sides, no batteries and no wiring. Pick it where you want zero power dependency and a key system you already run. If you need audit trail, user codes, or credentials instead of keys on the same bored prep, the Alarm Lock Trilogy DL2700 (Grade 1, 100 user codes, IC/SFIC compatible, 1-5/8 to 1-7/8 inch doors) or the Schlage NDEB ENGAGE wireless Grade 1 lock cover that ground.
9) My doors are thicker than 1-7/8 inches. Can I still use the Marks 175T?
No. The 175T tops out at 1-7/8 inch door thickness. For a thicker leaf, the Dorma C150 and C853 are rated to 2-1/4 inches, and the Cal-Royal CAL20 and CAL30 cover 1-3/8 to 2 inches, though those are privacy and passage functions rather than a key-both-sides lock.
10) For a restroom or patient room next to a corridor door using the Marks USA 175T, what privacy lock matches the Grade 1 level?
The Marks USA 175T is Grade 1 but is a keyed asylum/institution/utility function, not a privacy set. For the privacy openings on the same floor, the Cal-Royal CAL20 is a Grade 1 extra heavy duty privacy lock in the Calypso series covering doors 1-3/8 inch to 2 inch, and the Schlage CO-100-CY-40-KP is a Grade 1 heavy duty standalone electronic privacy lock for 1-3/4 inch doors if you want pushbutton credentials on the same opening. The Orca OCL240 privacy cylindrical lockset is a Grade 2 medium duty alternative where the traffic is lighter.
11) What should I pair with the Marks USA 175T on the non-locking doors in the same corridor?
The Marks USA 175T covers the keyed utility openings at Grade 1. For latching but non-locking doors in the same run, the Cal-Royal CAL30 is a Grade 1 extra heavy duty passage lock fitting doors 1-3/8 inch to 2 inch, which keeps the duty level consistent. If the door only needs trim and no latch at all, the Dorma C501 is a Grade 2 single dummy lever for 1-3/8 inch to 1-3/4 inch doors and the Orca OCL2170 is a Grade 2 half dummy lever. Lever style and finish match across the opening is worth confirming before you mix brands.
12) I want the Marks USA 175T's key-only control but with an audit trail for a school - what changes?
The Marks USA 175T controls the opening mechanically with a 6-pin MARKS C keyway cylinder and both levers permanently inoperable, so there is no record of who passed through. The TownSteel FCE-4000 is a Grade 1 heavy duty RFID electronic intruder classroom cylindrical lockset for 1-3/4 inch doors, the TownSteel XCE-9000 is a Grade 1 keypad classroom intruder lockset for 1-3/4 inch to 2 inch doors, and the Schlage NDEB is a Grade 1 heavy duty ENGAGE wireless cylindrical lock with Bluetooth Low Energy covering storeroom, office, privacy and apartment functions on 1-5/8 inch to 2 inch doors. All three trade mechanical simplicity for credential records and battery or network maintenance.
13) Can I use a Lockey keyless knob lock in place of the Marks USA 175T on a utility room door?
They solve different problems. The Marks USA 175T is a Grade 1 ADA compliant lever lockset - the lever trim is what makes it ADA compliant. The Lockey 1600 is a heavy duty mechanical keyless knob lock with an adjustable backset for 1-1/8 inch to 2 inch doors and the Lockey 2830 is a mechanical pushbutton keyless knob lock with auto-locking passage function over the same thickness range. Both are knob trim, so on an opening that must meet accessible hardware requirements the lever set is the one to specify.
14) If I need the Marks USA 175T opening tied into an access control system, what cylindrical lock works instead?
The Marks USA 175T is a purely mechanical Grade 1 cylindrical lockset with no electrical connection. For a wired opening, the SDC Electra 7200 Series is a solenoid controlled cylindrical lock running dual voltage 12/24VDC for doors 1-3/4 inch to 2 inch. For wireless, the Schlage NDEB is a Grade 1 ENGAGE series cylindrical lock on 2.4 GHz Bluetooth Low Energy, and the Schlage XE360M is a Grade 1 wireless tubular lock with a smart mobile reader for 1-3/4 inch doors in classroom/storeroom function. Power and head-end requirements are the trade for remote control of the door.
15) What finish does the Marks USA 175T come in?
Satin chrome, US26D. That is the standard commercial finish, so it lines up with the closers, hinges, and exit devices most institutional openings already carry.
16) How are the roses on the Marks 175T fastened, and will they loosen up on a high-traffic door?
The 3-1/4 inch diameter roses are spring loaded and pulled down with two #10 thru-bolts through the door, so the two sides clamp against each other rather than relying on screws into the door face. Levers are solid cast Zamac with a 1/2 inch return, and the latch carries a stainless steel nose.
How fast can I get the Marks USA 175T-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 175T-26D come with a warranty?
Absolutely. The Marks USA 175T-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 175T-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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