Marks USA MAR175RDC 175RDC Com...
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$113.88
Marks USA 175RDC Communicating Lever - SFIC Prep - LC, Grade 2, Less Cores

Marks USA MAR175RDC 175RDC Communicating Lever Cylindrical Lockset - SFIC Prep, Grade 2, Less Cores, ADA Compliant

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Model: 175RDC-26D
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Marks USA 175RDC Communicating Lever Cylindrical Lockset — SFIC Prep, Grade 2, Less Cores

The Marks USA 175RDC is a commercial-grade cylindrical lever lockset from the 175 Series, engineered for communicating door applications with SFIC (Small Format Interchangeable Core) preparation and supplied less cores. Built on a chassis featuring cast retractors on bronze roller bearings, this lockset exceeds BHMA Grade 1 specifications by 300%, surpassing 3.6 million cycles for exceptional long-term reliability. It accommodates door thicknesses of 1-5/8" to 1-7/8" (with optional K1904 spacer for 1-3/8" doors), offers 2-3/8" and 2-3/4" backsets, and carries a 3-Hour Fire Rating along with UL Listing and ANSI/BHMA certification.

Key Features

  • Exceptional Cycle Durability: Exceeds BHMA Grade 1 specifications by 300% with over 3.6 million cycles, ensuring long-term reliability in high-traffic commercial environments.
  • Unique Clutch Mechanism: The Survivor leverset features a stainless steel "clutch" that disengages levers from the retractor when locked, allowing levers to swing freely without resistance — dramatically reducing wear, abuse, and lever droop.
  • Bronze Roller Bearing Construction: Cast retractors on bronze roller bearings provide a strong, durable chassis foundation for millions of cycles of dependable operation.
  • Backset & Door Compatibility: Supports 2-3/8" and 2-3/4" backsets; fits door thicknesses of 1-5/8" to 1-7/8"; use K1904 spacer for 1-3/8" doors.
  • Latch Specifications: Latch #1834 with 1-1/8" x 2-1/4" front, 9/16" throw, and stainless steel nose for deadlocking performance.
  • Solid Cast Zamac Levers: Levers are solid cast zamac with 1/2" return (except 395 & 495 styles), providing robust construction for demanding commercial use.
  • Thru-Bolted Rose Assembly: 3-7/16" diameter spring-loaded roses secured with 2 #10 thru-bolts for a secure, rattle-free installation.
  • 3-Hour Fire Rated: Certified for 3-hour fire-rated door assemblies, meeting critical life-safety code requirements.
  • ADA Compliant: Lever design meets ADA accessibility requirements for commercial applications.
  • Marks Lifetime Mechanical Warranty: Backed by Marks USA's Lifetime Mechanical Warranty for added confidence and long-term value.

Certifications & Compliance

  • ANSI/BHMA Certified — Exceeds Grade 1 by 300% (over 3.6 million cycles)
  • UL Listed
  • 3-Hour Fire Rated
  • ADA Compliant
  • Marks Lifetime Mechanical Warranty

Technical Specifications

  • Series: 175 Series
  • 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 — Communicating and passage doors between suites
  • Healthcare Facilities — Patient room and corridor communicating doors
  • Educational Institutions — Classroom and hallway passage doors
  • Hospitality Properties — Hotel room communicating door configurations
  • Government and Municipal Buildings — Interior passage and hall doors
  • Multi-Tenant Residential Properties — Common area and corridor doors
  • Retail Establishments — Stockroom and back-of-house passage doors

Why Marks USA 175RDC?

The Marks USA 175RDC cylindrical lockset is built on a foundation of solid cast zamac levers, bronze roller bearings, and a patented stainless steel clutch mechanism that together deliver performance exceeding BHMA Grade 1 by 300% — surpassing 3.6 million cycles. With 3-Hour Fire Rating, UL Listing, ANSI/BHMA certification, and ADA compliance, the 175RDC is engineered to meet the most demanding commercial door hardware requirements with a lower-maintenance, longer-lasting design.

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 175RDC-26D – Frequently Asked Questions

1) Will the Marks USA 175RDC cylindrical lockset fit a 1-3/8 inch door?
Not on its own. The 175RDC chassis covers 1-5/8 to 1-7/8 inch doors, which is standard commercial thickness territory. For a 1-3/8 inch door you need the K1904 spacer with it. If you are hanging hardware on older 1-3/8 inch interior doors across a building, order the spacer with every lock or you will be stuck on site.
2) Does the Marks 175RDC lock the door, or does the lever always retract the latch?
It does not lock. The 175RDC is an ANSI F75 passage function, latch retracted by the levers at all times, and it is non-keyed. Use it on communicating, hall and closet doors where you want the door to latch shut but never secure. If the opening needs to be secured, this is the wrong function and you want an entrance or storeroom lock instead.
3) The 175RDC says SFIC prep and less cores. What do I actually get, and what else do I have to buy?
The 175RDC ships prepped for a Small Format Interchangeable Core and supplied without cores, so no core is in the box. That said, this is a passage function that is not keyed, so the SFIC prep is there for keying uniformity across a facility rather than to secure this particular opening. If your building runs an SFIC system, the prep lets the lock sit in the same visual and hardware family as the keyed openings on the same floor.
4) Will the Marks 175RDC latch into my existing ANSI strike?
Latch #1834 on the 175RDC has a 1-1/8 x 2-1/4 inch front and a 9/16 inch throw, with a stainless steel deadlocking nose. That front size is the standard cylindrical latch face, so it drops into existing 1-1/8 by 2-1/4 inch edge prep. What to watch is the strike lip and the gap: a 9/16 inch throw is a shallow passage-latch throw, so an out-of-plumb frame or a wide gap between door and jamb will leave it riding the lip instead of seating in the pocket.
5) Is the Marks 175RDC approved for a 3 hour fire rated door assembly?
Yes. The 175RDC carries a 3-hour fire rating and is UL Listed, and it is ANSI/BHMA certified. For a corridor or stair opening where the door assembly is rated, that is the line item your inspector is looking for. The lever design also meets ADA, which matters on the same openings in healthcare, education and government work.
6) My door is 2 inches thick. Can I use the Marks 175RDC lever set?
No. The 175RDC tops out at 1-7/8 inches, so a 2 inch door is outside its range and the thru-bolts will not make up. For that thickness, the Cal-Royal CAL30 passage lock covers 1-3/8 to 2 inches, and the Dorma C150 Grade 1 cylindrical lock covers 1-3/8 to 2-1/4 inches on an entry/office function if you also need the door to lock.
7) The door needs a lock, not a passage function. What should be used instead of the Marks USA 175RDC?
The Marks USA 175RDC is non-keyed with the latch retracted by the lever at all times, so it will not secure an opening. For a keyed opening, the Orca Hardware OCL250 is a Grade 2 entrance cylindrical lockset and the Dorma C853 is a Grade 1 single cylinder entry lever in the C800 Series fitting doors 1-3/8 inch to 2-1/4 inch. For a bath or bed door needing an inside lock, the Orca Hardware OCL240 is a Grade 2 privacy cylindrical lockset and the Cal-Royal CAL20 is a Grade 1 Calypso privacy lock for doors 1-3/8 inch to 2 inch.
8) What is the closest Grade 1 passage lever to the Marks USA 175RDC?
The Cal-Royal CAL30 Calypso Series is a Grade 1 extra heavy duty passage lock in the same Passage/Hall/Closet function as the Marks USA 175RDC, and it fits doors from 1-3/8 inch to 2 inch, so it covers thinner and thicker doors without a spacer. The 175RDC is a Grade 2 cylindrical lockset with SFIC prep supplied less cores, so it drops into an existing small format interchangeable core keying program; the CAL30 is specified on grade and door range rather than core prep.
9) Is a Grade 2 cylindrical lockset tough enough for a high traffic commercial corridor?
The 175RDC is catalogued Grade 2, but the cycle performance is well past that: Marks states it exceeds BHMA Grade 1 by 300 percent, surpassing 3.6 million cycles. The chassis uses cast retractors on bronze roller bearings, and the Survivor clutch lets the levers swing free of the retractor rather than fighting it, which is what kills levers on abused doors. For a passage opening in an office corridor or a school hallway, the durability story is the reason to pick it over a plain Grade 2.
10) What is the difference between the Marks 175RDC passage lever and the Cal-Royal CAL30 passage lockset?
Both are passage function cylindrical levers. The CAL30 is a Grade 1 extra heavy duty Calypso Series lock with a 1-3/8 to 2 inch door thickness range, so it covers thinner and thicker doors straight out of the box. The Marks 175RDC is a Grade 2 lock covering 1-5/8 to 1-7/8 inch doors, needing the K1904 spacer at 1-3/8 inch, and it comes SFIC prepped. Pick the Marks if your facility is standardizing on SFIC hardware; pick the CAL30 if you have a mixed range of door thicknesses on the job.
11) I need a passage lever for the same doors but on a tighter budget spec. What else is there?
Two medium duty Grade 2 passage options sit alongside the Marks 175RDC: the Orca Hardware OCL210 passage cylindrical lockset and the Dorma CL700 Series CL701, also Grade 2 passage. Neither carries the 175RDC's SFIC prep or its 3.6 million cycle chassis, so on a heavily used corridor you are trading durability for cost. For a back-of-house stockroom door that gets used a few times a day, the lighter lock is enough.
12) Can the Marks USA 175RDC be used where access needs to be controlled by code rather than a key?
The Marks USA 175RDC is a mechanical, non-keyed passage lockset, so it offers no code or credential control. For keypad entry in the same cylindrical prep, the Alarm Lock Trilogy T2 DL2700 is a Grade 1 standalone electronic cylindrical entrance lock with 100 user codes and IC/SFIC compatibility, fitting the same 1-5/8 inch to 1-7/8 inch door range the 175RDC covers. The Alarm Lock T3 DL3075 adds an audit trail in the DL3200 Series. The Schlage NDEB is a Grade 1 ENGAGE Series wireless cylindrical lock with Bluetooth Low Energy for doors 1-5/8 inch to 2 inch.
13) Is there a simpler Grade 2 passage lever than the Marks USA 175RDC for low-traffic interior doors?
The Orca Hardware OCL210 is a Grade 2 passage cylindrical lockset rated medium duty, and the Dorma CL701 is a Grade 2 CL700 Series non-keyed lever in the same Passage/Hall/Closet function. Both hold the latch retracted by the lever at all times, the same F75 passage operation the Marks USA 175RDC provides, without the 175RDC's SFIC core preparation. Specify the 175RDC where the opening needs the communicating configuration and a 3-hour fire rated, ADA compliant lever.
14) What passage lever fits a 1-3/8 inch door without adding a spacer?
The Marks USA 175RDC covers 1-5/8 inch to 1-7/8 inch doors and takes the K1904 spacer for 1-3/8 inch. If a spacer is not wanted, the Cal-Royal CAL30 Calypso passage lock covers 1-3/8 inch to 2 inch as standard. The Lockey 2830 mechanical pushbutton keyless knob lock also has a passage function and spans 1-1/8 inch to 2 inch, though it is a knob with pushbutton operation rather than a lever.
15) For a classroom opening needing lockdown, what is used instead of the Marks USA 175RDC?
The Marks USA 175RDC is a passage function, latch retracted at all times, so it cannot be locked down. For classroom security, the TownSteel FCE-4000 Series is a Grade 1 RFID electronic intruder classroom cylindrical lockset and the XCE-9000 Series is a Grade 1 electronic classroom intruder lockset with keypad for doors 1-3/4 inch to 2 inch. The Schlage XE360M is a Grade 1 wireless tubular lock in classroom/storeroom function for 1-3/4 inch doors.
16) Does the Stanley QTL230E passage lever cross to the Marks USA 175RDC?
They are not a straight cross. The Stanley Security QTL230E-SA-478S is a QTL200 Series Sierra bent lever with a small rose, an adjustable square latch and a 4-7/8 inch by 1-1/4 inch ANSI strike. The Marks USA 175RDC uses latch #1834 with a 1-1/8 inch by 2-1/4 inch front and a 9/16 inch throw, on a 2-3/4 inch backset, so the latch front and strike prep in the existing door decide which one drops in.
17) The keying program uses SFIC cores. Which locks besides the Marks USA 175RDC accept them?
The Marks USA 175RDC is supplied with SFIC preparation less cores, so the facility's own small format interchangeable cores install into it. Among electronic options, the Alarm Lock Trilogy T2 DL2700 is IC/SFIC compatible and the BEST 9KZ EZ Series is an electronic keypad cylindrical lock with a key override function. The Stanley QCL150 is a QCL100 Series Grade 2 entry lever supplied less cylinder with a square 2-3/4 inch backset latch, the same backset the 175RDC uses.
18) What finish does the Marks 175RDC communicating lever come in, and will it match the rest of my hardware?
US26D satin chrome is the finish offered. That is the default commercial finish on most Grade 1 and Grade 2 institutional hardware, so it lines up with the satin chrome closers, hinges and exit devices already on most office, school and healthcare openings. If your building is standardized on bronze or brass, this will not match.
19) How is the Marks 175RDC rose mounted, and will it work loose on a busy door?
The roses are 3-7/16 inch diameter and spring loaded, secured with two #10 thru-bolts through the door. Thru-bolting is what keeps a lever from going loose and rattling under traffic, unlike a set-screw rose that backs off. One thing to check before ordering: the 3-7/16 inch rose has to cover whatever the previous lock left behind, so if you are replacing a lock with a larger rose you will see the ring of unfinished door around it.
20) Is the Marks 175RDC lever solid metal or hollow, and how far does the lever return?
Levers are solid cast zamac with a 1/2 inch return, except in the 395 and 495 lever styles. A returned lever is what keeps a bag strap or a sleeve from catching on the end, and it is part of why the lever meets ADA. Solid cast rather than tubed is the difference you feel when someone hangs off it.
21) Which passage lever is specified when a facility is standardizing on Grade 1 heavy duty across all openings?
The Marks USA 175RDC is ANSI/BHMA certified and UL listed at Grade 2 with a 3-hour fire rating and ADA compliant lever. Where a Grade 1 line is required across mixed functions, the Cal-Royal Calypso Series covers passage with the CAL30 and privacy with the CAL20, both Grade 1 for doors 1-3/8 inch to 2 inch, and the Dorma C100 Series C150 is a Grade 1 heavy duty entry/office cylindrical lock for 1-3/8 inch to 2-1/4 inch doors.
How fast can I get the Marks USA 175RDC-26D delivered?
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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 Marks USA 175RDC-26D come with a warranty?
Absolutely. The Marks USA 175RDC-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 175RDC-26D?
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