Marks USA MAR175S 175S Classro...
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$160.34
$80.82
Marks USA Marks USA 175S Classroom Lever Lockset - Grade 2 Survivor Series, American Lever 175S

Marks USA MAR175S 175S Classroom Lever Lockset — Grade 2 Survivor Series, ADA Compliant, American Lever

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Model: 175S26D-3/4
$160.34
$80.82
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$160.34
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Marks USA 175S Classroom Lever Lockset — Grade 2 Survivor Series, ADA Compliant

The Marks USA 175S Classroom Lever Lockset is part of the 175 Grade 2 Economy Series, engineered to deliver the performance and quality of a Grade 1 lockset at a Grade 2 price point. Featuring a cylindrical lock design with a deadlocking latch bolt and American-style lever trim, this lockset is purpose-built for classroom security applications where the outside lever is locked by key while the inside lever remains always free. Designed for doors with a 1-3/4" thickness and a 2-3/4" backset, the 175S meets ANSI/BHMA standards and is UL Listed, making it a trusted choice for commercial environments including office buildings, schools, universities, and hospitals.

Key Features

  • Classroom Function (ANSI F84): Deadlocking latch bolt operated by levers; outside lever locked by key while inside lever remains always free — ideal for classroom security requirements.
  • Grade 2 Economy Series Value: Marks USA 175 Series delivers Grade 1-level performance and quality at a Grade 2 price, maximizing value for commercial projects.
  • Precise Dimensional Specifications: Designed for 1-3/4" door thickness with a 2-3/4" backset and a 1/2" latch throw for reliable, consistent operation.
  • Front Plate & Strike Sizing: Front size of 1-1/8" x 2-1/4"; includes ANSI-standard strike measuring 1-1/4" x 4-7/8" with 1-1/4" lip and square corner for clean, code-compliant installation.
  • ADA Compliant Lever Design: American lever style meets ADA accessibility requirements, ensuring compliance in public and commercial facilities.
  • Deadlocking Latch Bolt: Provides added security by preventing the latch from being pushed back without proper key operation, reducing vulnerability to shimming attacks.
  • Cylindrical Bored Lock Construction: Standard cylindrical lock format simplifies installation in pre-bored doors and is compatible with common door prep specifications.
  • Broad Commercial Applicability: Suitable for office buildings, schools, universities, hospitals, and other high-traffic commercial environments requiring dependable access control.

Certifications & Compliance

  • ANSI/BHMA Certified
  • UL Listed
  • ADA Compliant
  • ANSI Function F84 (Classroom)

Technical Specifications

  • Series: 175 Series
  • Latch Throw: 1/2"
  • Product Group: Mechanical Locks
  • Product Subgroup: Bored Locksets
  • Product Type: Cylindrical Locks
  • Subcategory: Cylindrical Locks
  • ANSI/BHMA: ANSI/BHMA, UL Listed
  • Lock Type: Cylindrical
  • Function Description: Deadlocking latch bolt by levers. Outside knob/lever is locked by key in outside lever. Inside knob/lever is always free.
  • Front Size: 1-1/8" x 2-1/4"
  • ADA Compliant: Yes
  • Keyed: Yes
  • ANSI Function: F84
  • Product Attribute: Cylindrical Locks
  • Product Function: Classroom
  • Door Thickness Range: 1-3/4"
  • Latch Type Specification: Deadlocking
  • 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

Typical Applications

  • K-12 Schools and University Classrooms
  • Commercial Office Buildings
  • Healthcare Institutions and Hospitals
  • Government and Municipal Buildings
  • Multi-Tenant Residential and Mixed-Use Properties
  • Retail Establishments
  • Industrial and Warehouse Facilities

Why Marks USA 175S?

Marks USA 175 Series cylindrical locksets are engineered to bridge the gap between economy pricing and professional-grade performance, delivering ANSI/BHMA-certified, UL Listed quality in a bored cylindrical format. With ADA-compliant American lever trim, a deadlocking latch bolt, and precise dimensional specifications including a 1-3/4" door thickness range and 2-3/4" backset, the 175S is built to meet the rigorous demands of high-traffic commercial and institutional environments. For facilities managers and contractors seeking reliable classroom security hardware without compromising on compliance or durability, the Marks USA 175S is a proven, value-driven solution.

Manufacturer Resources

Marks USA Product Catalog

Product Specs

Series:
175 Series
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 by levers. Outside knob/lever is locked by key in outside lever. Inside knob/lever is always free.
Front Size:
1-1/8” x 2-1/4”
ADA Compliant:
Yes
Keyed:
Yes
ANSI Function:
F84
Product Attribute:
Cylindrical Locks
Product Function:
Classroom
Door Thickness Range:
1-3/4"
Latch Type Specification:
Deadlocking
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 175S26D-3/4 – Frequently Asked Questions

1) Will the Marks USA 175S classroom lockset fit a standard 1-3/4 inch commercial door?
Yes. The 175S is specified for 1-3/4 inch door thickness, which is the standard commercial door. It is a bored cylindrical lock, so it goes into a standard cylindrical prep, and it ships in either a 2-3/8 inch or a 2-3/4 inch backset so it can match the cross bore location already in the door. Pick the backset by measuring from the door edge to the center of the existing 2-1/8 inch bore.
2) How does the classroom function work on the Marks 175S, and does the inside lever ever lock?
The inside lever is always free on the 175S, so anyone in the room can get out at any time without a key or a thumbturn. Locking is done from the corridor side: a key in the outside lever locks or unlocks that lever, and the deadlocking latch bolt is retracted by either lever when unlocked. That is ANSI F84 classroom function. Note what it does not do: there is no way to lock the door from inside the room, so if your district requires a teacher to secure the room without stepping into the hallway, this is the wrong function.
3) Will the Marks 175S latch into the strike that is already in my frame?
It depends on what strike is in there now. The 175S latch has a 1/2 inch throw and the lock ships with a full ANSI strike, 1-1/4 x 4-7/8 inches with a 1-1/4 inch lip and square corners, which is the standard commercial frame prep. If your frames are cut for that ANSI strike, the new one drops straight in. If you have a small T-strike or a residential-style strike, the frame lip is not cut deep enough and you will either be filling and re-prepping the frame or reusing the existing strike. The latch front measures 1-1/8 x 2-1/4 inches, so also check that against the mortise in the door edge.
4) Can I use the Marks 175S on a 1-3/8 inch interior door or a 2 inch thick door?
No. The 175S is built for 1-3/4 inch doors and nothing else, it is a single thickness lock rather than an adjustable-range one. For a 1-3/8 inch older interior door or a thicker slab, you need a lock with a stated range: the Cal-Royal Calypso locks cover 1-3/8 to 2 inches, and the Dorma C150 and C853 cover 1-3/8 to 2-1/4 inches. Measure the door edge before ordering, 1-3/8 inch is common on older interior openings and it is the most frequent reason a commercial lock arrives and will not close up.
5) What is the difference between the Standard and G3 Less Cylinder option on the Marks 175S?
Standard ships the lock complete with its own key cylinder, ready to key. G3 Less Cylinder ships the lockset with no cylinder in the outside lever, which is what you order when you are putting the building on an interchangeable core or a restricted keyway you already own, and your locksmith supplies the core. If you are a property manager replacing one door and you do not run a house keyway, order Standard.
6) Is the Marks USA 175S ADA compliant for a school or public building?
Yes. The 175S uses an American style lever rather than a knob, which satisfies the ADA requirement for operable hardware that works without tight grasping, pinching, or twisting of the wrist. It is listed as ADA compliant. Mounting height and clear floor space are still on the installer, but the hardware itself is not what will fail your inspection.
7) Is a Grade 2 lockset like the Marks 175S good enough for a high traffic school corridor, or do I need Grade 1?
Grade 2 is the ANSI/BHMA commercial duty tier below Grade 1, and the 175S is certified Grade 2 and UL Listed. For classroom doors, offices, and similar commercial traffic it is the normal specification. Where a project drawing calls out Grade 1 by name, the 175S will not meet the letter of the spec and you want a Grade 1 cylindrical, such as the Dorma C150 Series or the Cal-Royal Calypso line, both listed Grade 1. Substituting down on a spec'd job gets the hardware rejected at closeout.
8) Can the Marks 175S replace an electronic keypad classroom lock on the same door?
Mechanically the prep is the same family, but the 175S is a key-operated mechanical lock with no keypad, no credentials, and no audit trail. If the door currently runs something like the TownSteel XCE-2000 keypad classroom lockset or the Schlage XE360M wireless classroom/storeroom lock and the facility depends on codes or credentials, dropping in the 175S means going back to brass keys for that opening. Where the electronics were never used and the site just wants a reliable keyed classroom door, that swap is a reasonable downgrade.
9) Does the deadlocking latch on the Marks 175S stop someone from slipping the door with a card?
Yes, that is what the deadlocking latch is for. A spring-loaded deadlatch plunger rides against the strike when the door is closed and blocks the main latch bolt from being pushed back, so shimming or carding the latch does not open it. It only works if the strike is aligned properly, the plunger has to land on the strike face and not fall into the strike opening alongside the bolt.
10) Do I have to specify handing when ordering the Marks 175S classroom lever?
No handing to call out. The 175S is a cylindrical bored lockset with levers on both sides, and cylindrical locks of this type are non-handed, the latch bolt reverses on site so the same lock works on a left or right hand door. What you do have to specify is the backset, 2-3/8 or 2-3/4 inches, the finish, and whether you want it Standard with cylinder or G3 less cylinder.
11) The room does not need to be keyed at all. What is the simpler alternative to the Marks USA 175S classroom lockset?
The Marks USA 175S is a keyed lockset; the key in the outside lever is what secures the opening. Where a door only needs to latch and never lock, a non-keyed cylindrical lever removes the cylinder and the keying work entirely. The Orca Hardware OCL210 is a Grade 2 medium duty passage cylindrical lockset, and the Cal-Royal CAL30 is a Grade 1 extra heavy duty passage lockset in the Calypso Series that fits doors from 1-3/8 inch to 2 inch. For a bathroom or office where the occupant locks from inside without a key, the Orca OCL240 is a Grade 2 privacy cylindrical lockset and the Cal-Royal CAL20 is a Grade 1 privacy lock over the same 1-3/8 inch to 2 inch door range.
12) Which classroom lock gives an audit trail of who opened the door, since the Marks USA 175S does not?
The Marks USA 175S is a mechanical keyed classroom lockset, so access is controlled by key possession. Where a facility needs a record of each opening or centrally managed credentials, the Alarm Lock T3 DL3075 is a Grade 1 electronic cylindrical lock in the DL3200 Series with audit trail and keypad access, and the Schlage NDEB is a Grade 1 heavy duty ENGAGE Series cylindrical lock with a 2.4 GHz Bluetooth Low Energy mobile-enabled reader for doors 1-5/8 inch to 2 inch. Both install in a cylindrical prep, so the door boring carries over from a 175S.
13) Does the Marks USA 175S work on an access control system, or do I need a different lock?
The Marks USA 175S is a mechanical cylindrical lockset operated by key; it has no electrical connection. For an opening that must release from a card reader, intercom or access control panel, 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, and the Schlage XE360M is a Grade 1 wireless tubular lock in classroom/storeroom function with a smart mobile reader for a 1-3/4 inch door. Both are chosen when the door is part of a system rather than a keyed opening.
14) Will a residential smart lever like the Kwikset SmartCode substitute for the Marks USA 175S in a school or office?
They are built for different duty. The Marks USA 175S is specified for commercial use, ANSI/BHMA certified and UL Listed, with a deadlocking latch bolt and ADA compliant American lever trim. The Kwikset 912TNL ZW500 SmartCode is a keyed-one-side electronic Tustin lever with Z-Wave technology in the SmartCode series, for doors 1-3/8 inch to 2 inch. Z-Wave suits a residential or light multi-family setting on a home automation hub; a commercial classroom or corridor specified to ANSI/BHMA is the 175S case.
15) We key everything to a small format interchangeable core. Which cylindrical locks in this class take an SFIC?
The Marks USA 175S is a keyed cylindrical lockset and can be ordered less cylinder, which is how it is supplied when the cylinder is set by the keying house rather than the factory. Among electronic peers, the Alarm Lock Trilogy T2 DL2700 is IC/SFIC compatible and is a Grade 1 standalone electronic cylindrical lock for 1-5/8 inch to 1-7/8 inch doors, and the BEST 9KZ EZ Series is an electronic keypad cylindrical lock with a key override function. Confirm the keyway you are standardizing on before the order is cut.
16) What finishes does the Marks 175S classroom lever come in, and can I match the rest of my building?
Four finishes: US26D satin chrome, US10 satin bronze, US10B oil-rubbed dark bronze, and US3 bright brass. US26D is the one to order if you are matching typical commercial school and office hardware. Every one of the four is available in both the 2-3/8 and the 2-3/4 inch backset, so finish and backset are independent choices.
17) I need matching passage and privacy levers to go with a classroom lock on the same corridor. What are my options?
The 175S itself is classroom function only, keyed on the outside lever. To fill out the rest of the openings from a single Grade 2 line, the Orca Hardware OCL series covers it: OCL210 passage for closets and hall doors, OCL240 privacy for restrooms, OCL250 entrance for keyed offices, and OCL2170 half dummy for inactive leaves, all Grade 2 medium duty cylindrical. The Dorma CL700 Series also offers a Grade 2 dummy lever. Lever style and finish will not match the Marks American lever exactly, so mixing families is a visual decision as much as a functional one.
How fast can I get the Marks USA 175S26D-3/4 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 175S26D-3/4 come with a warranty?
Absolutely. The Marks USA 175S26D-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 175S26D-3/4?
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