Marks USA MAR175NB 175NB Commu...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$115.20
$58.08
Marks USA 175NB Communicating Passage Clutched Lever Lockset, 2-3/4in Bracket, ANSI Strike, Grade 2

Marks USA MAR175NB 175NB Communicating Passage Clutched Lever Lockset with 2-3/4in Backset, ANSI Strike, Grade 2

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Model: 175NB26D-3/4
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$115.20
$58.08
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Marks USA 175NB Communicating Passage Clutched Lever Lockset — Lifetime Mechanical Warranty, 3.6 Million Cycles

The Marks USA 175NB is a commercial-grade cylindrical communicating passage clutched lever lockset engineered for demanding, high-traffic environments. Featuring the Survivor leverset's unique stainless steel clutch mechanism paired with bronze roller bearings on a cast retractor chassis, this lockset exceeds BHMA Grade 1 specifications by 300% — surpassing 3.6 million cycles. Designed for doors 1-5/8" to 1-7/8" thick (with optional K1904 spacer for 1-3/8" doors), it ships with a 2-3/4" backset and an ANSI #1145 ASA strike, and carries a 3-hour fire rating.

Key Features

  • Exceptional Cycle Durability: Exceeds BHMA Grade 1 specifications by 300% with over 3.6 million cycles, delivering long-term reliability in high-traffic commercial applications.
  • Survivor Clutch Mechanism: Unique stainless steel clutch disengages levers from the retractor when locked, allowing levers to swing freely without resistance — eliminating lever droop and dramatically reducing wear on internal components.
  • Cast Retractor on Bronze Roller Bearings: Solid cast Zamac levers with 1/2" return ride on bronze roller bearings for smooth, consistent operation over millions of cycles.
  • Door Thickness Compatibility: Fits doors 1-5/8" to 1-7/8" thick; use K1904 spacer for 1-3/8" doors. Supports both 2-3/8" and 2-3/4" backsets.
  • Latch Specifications: Latch #1134 with 1-1/8" x 2-1/4" front, 1/2" throw, and stainless steel nose for corrosion resistance and durability.
  • Thru-Bolted Roses: 3-1/4" diameter roses are spring-loaded and secured with 2 #10 thru-bolts for a solid, tamper-resistant installation.
  • 3-Hour Fire Rated: Meets 3-hour fire rating requirements for use in fire-rated door assemblies in commercial construction.
  • Lifetime Mechanical Warranty: Backed by Marks USA's lifetime mechanical warranty for added confidence and long-term value.

Certifications & Compliance

  • Exceeds BHMA Grade 1 Specification by 300% (3.6 Million Cycles)
  • ANSI/BHMA Certified
  • UL Listed
  • ADA Compliant
  • 3-Hour Fire Rated
  • Marks USA Lifetime Mechanical Warranty

Technical Specifications

  • Series: 175 Series
  • Latch Throw: 9/16"
  • Product Group: Mechanical Locks
  • Product Subgroup: Bored Locksets
  • ANSI/BHMA: ANSI/BHMA, UL Listed
  • Commercial/Residential: Commercial
  • Function Description: Latch retracted by knobs/levers at all times
  • ADA Compliant: Yes
  • Keyed: No
  • ANSI Function: F75
  • Product Function: Passage/Hall/Closet
  • Latch Type Specification: Deadlocking
  • Product Category: Mechanical Locks
  • Department: Door Hardware

Typical Applications

  • Commercial Office Buildings
  • Educational Facilities and Schools
  • Healthcare Institutions and Medical Offices
  • Retail Establishments
  • Government and Municipal Buildings
  • Multi-Tenant Residential and Hospitality Properties
  • Industrial and Warehouse Facilities

Why Marks USA 175NB?

Marks USA 175 Series locksets are built around a cast retractor on bronze roller bearings chassis that exceeds BHMA Grade 1 durability standards by 300%, surpassing 3.6 million cycles. The Survivor clutch mechanism — crafted from stainless steel — sets this leverset apart by eliminating lever droop and reducing internal wear, making it an ideal choice for high-traffic commercial doors where long-term, low-maintenance performance is non-negotiable.

Manufacturer Resources

Marks USA Product Catalog

Product Specs

Series:
175 Series
Latch Throw:
9/16"
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:
Latch retracted by knobs/levers at all times
Front Size:
1-1/8” x 2-1/4”
ADA Compliant:
Yes
Keyed:
No
ANSI Function:
F75
Product Attribute:
Cylindrical Locks
Product Function:
Passage/Hall/Closet
Latch Type Specification:
Deadlocking
Product Category:
Mechanical Locks
Backset (Distance):
2-3/4"
Department:
Door Hardware

Marks USA 175NB26D-3/4 – Frequently Asked Questions

1) Will the Marks USA 175NB passage lever fit a 1-3/8 inch door?
Not on its own. The 175NB is built for doors 1-5/8 to 1-7/8 inches thick, which covers standard 1-3/4 inch commercial doors. For a 1-3/8 inch door you need the K1904 spacer with it. If you would rather not add a spacer part, the Cal-Royal CAL30 passage lockset covers 1-3/8 to 2 inches out of the box.
2) Does the Marks 175NB lever lock, or is it always free to turn?
It never locks. Function F75 passage: the latch is retracted by the levers at all times, from both sides, with no key and no privacy button. Use it on corridor, hall, closet, and communicating doors where you only want the door to stay latched shut. If you need the door to lock, the Orca OCL240 is the privacy version and the Orca OCL250 is the keyed entrance version in the same cylindrical family.
3) Will the Marks 175NB latch drop into my existing 2-3/4 inch backset prep?
It ships set for a 2-3/4 inch backset, and the 175 Series supports 2-3/8 inch as well, so it covers both of the standard bored-door preps. The latch is the #1134 with a 1-1/8 x 2-1/4 inch front and a 9/16 inch throw, and it comes with an ANSI #1145 ASA strike. If your frame already has an ASA strike cutout, that is the prep it is made for; a frame with only a small T-strike lip will need the cutout enlarged or a T-strike substituted.
4) Can I use the Marks 175NB on a 3-hour fire rated door?
Yes. The 175NB carries a 3-hour fire rating and is UL Listed, and the latch is a deadlocking type, which is what a fire assembly needs to stay positively latched. It is also ADA compliant, so the lever works for accessible openings in the same building.
5) What is the closest equivalent to the Marks USA 175NB passage lever if I need a Grade 1 passage lockset instead of Grade 2?
The Cal-Royal CAL30 Calypso is a Grade 1 extra heavy duty passage cylindrical lockset, where the Marks USA 175NB carries a Grade 2 rating. Both are passage function, so the lever retracts the latch at all times with no keying. The CAL30 fits doors 1-3/8 inch to 2 inch thick, a wider span than the 175NB range of 1-5/8 inch to 1-7/8 inch. If a specification calls out ANSI/BHMA Grade 1 for a corridor or classroom door, the CAL30 is the direct swap in the same function.
6) For a classroom door that has to lock down from inside, what replaces a passage lever?
A passage lever such as the Marks USA 175NB has no locking function, so it cannot serve a lockdown plan. The TownSteel FCE-4000 is a Grade 1 heavy duty RFID electronic intruder classroom cylindrical lockset for 1-3/4 inch doors, and the TownSteel XCE-9000 is a Grade 1 heavy duty electronic classroom intruder lockset with a keypad for doors 1-3/4 inch to 2 inch. The Schlage XE360M is a Grade 1 wireless tubular lock in classroom/storeroom function with a smart mobile reader for 1-3/4 inch doors.
7) Which lever passage set holds up on a school or hospital corridor door that gets hammered all day?
Cycle life is the thing to look at, and the 175 Series is rated past 3.6 million cycles, exceeding BHMA Grade 1 by 300 percent. The reason is the Survivor stainless steel clutch: when the lever is turned against a locked or fixed retractor it disengages instead of loading the internals, so you do not get lever droop after a few years of abuse. Cast Zamac levers with a 1/2 inch return ride on bronze roller bearings. For a passage opening in an institutional corridor that is the durability argument.
8) What is a communicating passage lockset actually used for?
A communicating door is the door between two adjoining rooms, hotel rooms or connected offices being the common case. The 175NB is the passage version: levers on both sides retract the latch at all times, so the door swings from either room without a key. It is not a lock. If the two rooms need to be secured from each other, that is a keyed or privacy function instead, and this is the wrong part.
9) How does the Marks 175NB mount, and will the rose cover the old holes?
Thru-bolted. The roses are 3-1/4 inches in diameter, spring loaded, and pull down with two #10 thru-bolts, so the set clamps through the door rather than relying on screws into one face. That 3-1/4 inch rose covers a standard 2-1/8 inch cross bore with room to spare, but it will not hide the larger cutouts left by an oversized or non-standard trim.
10) I need keypad or card access on this opening, not a passage lever. What should I look at instead?
The 175NB has no electronics and no cylinder, so it cannot do access control. For a standalone keypad on a cylindrical prep, the Alarm Lock Trilogy T2 DL2700 is Grade 1 and fits the same 1-5/8 to 1-7/8 inch door range, so it drops onto the same doors. For credential-based access, the Schlage NDEB ENGAGE wireless lock is Grade 1 and covers 1-5/8 to 2 inches. Both are cylindrical, so the door prep carries over.
11) I need a medium duty passage lever for interior office doors rather than a high cycle commercial chassis - what is the simpler option?
The Orca Hardware OCL210 is a Grade 2 passage cylindrical lockset rated medium duty. The Marks USA 175NB is also Grade 2 passage, but it is built on a cast retractor riding bronze roller bearings with a stainless steel clutch and is rated past 3.6 million cycles. For closet, storage and low-traffic interior office doors where the lever is turned a handful of times a day, the OCL210 covers the same passage function on a medium duty chassis.
12) Can I put an electronic keypad lock on the same door prepped for the Marks USA 175NB?
The 175NB is a mechanical cylindrical lockset with no keying. Several electronic cylindrical locks share the same door thickness window of 1-5/8 inch to 1-7/8 inch: the Alarm Lock Trilogy T2 DL2700, a Grade 1 standalone electronic cylindrical lock with a digital keypad, 100 user codes and IC/SFIC compatibility; the Alarm Lock Trilogy 4100, Grade 1 with a privacy function and keypad; and the Alarm Lock DL5200, a double-sided electronic cylindrical lock with 100 user capacity on battery power. These add code-based access control the mechanical 175NB does not provide, and they carry batteries and electronics that a passage lockset does not.
13) My door is 1-3/4 inch and I want an access controlled lever instead of a mechanical passage lever - what fits?
On a 1-3/4 inch door, the TownSteel FCE-2000 is a Grade 1 heavy duty standalone motorized cylindrical lockset with RFID in classroom function, and the Schlage CO-100 is a Grade 1 heavy duty standalone electronic cylindrical lock in privacy function with a keypad and cylinder options. The TownSteel XCE-2000 is a Grade 1 heavy duty electronic classroom lockset with a keypad for doors 1-3/4 inch to 2 inch. All three replace the mechanical, non-keyed passage operation of the Marks USA 175NB with a credential or code controlled function.
14) What passage lever works on a door thinner or thicker than the Marks USA 175NB range?
The Marks USA 175NB fits doors 1-5/8 inch to 1-7/8 inch, with the K1904 spacer extending it to 1-3/8 inch doors. If the opening falls outside that, the Cal-Royal CAL30 Calypso passage lockset covers 1-3/8 inch to 2 inch as supplied, and the Lockey 2830 mechanical pushbutton keyless knob lock with auto-locking passage function covers 1-1/8 inch to 2 inch. The Lockey is a knob with a pushbutton keypad rather than a lever, so it is a different trim and a different user experience on the door.
15) Which lever lockset matches the 2-3/4 inch backset and ASA strike prep already in my door?
The Marks USA 175NB ships with a 2-3/4 inch backset and an ANSI #1145 ASA strike, with a 1-1/8 inch x 2-1/4 inch latch front. The Stanley Security QCL150 also uses a square 2-3/4 inch backset latch with a 4-7/8 inch x 1-1/4 inch ASA strike, in Grade 2 entrance function. The Stanley Security QCL200 comes keyed different in the SC keyway with a 118F ANSI 1-1/8 inch x 2-3/4 inch strike, which is a different strike size than the ASA prep. Confirm the strike cutout in the frame before choosing between them.
16) Can I use a residential smart lever like the Kwikset SmartCode in place of a commercial passage lockset?
The Kwikset 912TNL ZW500 SmartCode is an electronic Tustin lever with Z-Wave, keyed one side, for doors 1-3/8 inch to 2 inch. The Marks USA 175NB is a commercial cylindrical lockset, ANSI/BHMA certified and UL listed, ADA compliant, on a 3-hour fire rated assembly rating. On a fire rated commercial opening the 175NB carries the listings the specification asks for; the Kwikset is a keyed-one-side electronic lever built for a different application.
17) What do I use if the passage door has to release on a fire alarm or card reader signal?
A mechanical passage lockset like the Marks USA 175NB has no electrical connection - the levers retract the latch at all times and nothing controls it remotely. The SDC Electra 7200 Series is a solenoid controlled cylindrical lock with dual voltage 12/24VDC for doors 1-3/4 inch to 2 inch, which is the type that ties into an access control panel or alarm interface. The SDC E75 Series is battery powered with a keypad for doors 1-3/4 inch to 2-1/8 inch and works standalone rather than wired to a panel.
18) What finish does the Marks USA 175NB lever set come in?
US26D satin chrome, the standard commercial finish. If you are standardizing a floor or a building on one look, that is the only finish this passage set is built in, so match your other openings to 26D rather than expecting a bronze or brass option here.
19) Is the Marks 175NB a residential or commercial lever set?
Commercial. It is a cylindrical bored lockset built to a commercial spec, ANSI/BHMA certified and UL Listed, with the ANSI ASA strike prep that commercial hollow metal frames use. On a house door the ASA strike prep and thru-bolted trim are usually more than the frame is cut for.
20) Is the Stanley QTL230E passage lever a drop-in alternative to the Marks USA 175NB?
They are not the same part. The Marks USA 175NB is a commercial cylindrical passage lockset, ANSI F75, with a deadlocking latch, 2-3/4 inch backset and a 1-1/8 inch x 2-1/4 inch front. The Stanley Security QTL230E is a Grade 2 passage lever in the QTL200 series with a Sierra bent lever, small rose, adjustable square latch and a 4-7/8 inch x 1-1/4 inch ANSI strike. The strike face differs from the 175NB ANSI #1145 ASA strike, and the QTL230E uses an adjustable latch rather than a fixed 2-3/4 inch backset, so verify the frame prep and rose diameter against the existing door before swapping.
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Can I return it if it doesn’t work for me?
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Does the Marks USA 175NB26D-3/4 come with a warranty?
Absolutely. The Marks USA 175NB26D-3/4 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 175NB26D-3/4?
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