Marks USA MAR175B 175B Entry L...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$160.34
$102.08
Marks USA 175B Entry Lever Lockset - Grade 2 Survivor Series, American Lever, Entry

Marks USA MAR175B 175B Entry Lever Lockset — Survivor Series, Grade 2, Clutch Mechanism, 3-Hour Fire Rated

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

$160.34
$102.08
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Marks USA 175B Entry Lever Lockset — Survivor Series, Grade 2, Clutch Mechanism, 3-Hour Fire Rated

The Marks USA 175B is a commercial-grade cylindrical entry lever lockset from the Survivor Series, engineered for demanding applications where durability and low maintenance are essential. Built with a unique stainless steel "clutch" mechanism and cast retractors on bronze roller bearings, this lockset exceeds BHMA Grade 1 specifications by 300%, achieving over 3.6 million cycles. It accommodates 2-3/8" and 2-3/4" backsets, features a 1/2" latch throw with a deadlocking latch, and is rated for 3-hour fire applications — making it a reliable choice for commercial entry doors with a 1-3/4" door thickness.

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 environments.
  • Unique Clutch Mechanism: Stainless steel "clutch" disengages levers from the retractor when locked, dramatically reducing wear and abuse, eliminating lever droop, and extending service life.
  • Bronze Roller Bearing Construction: Cast retractors on bronze roller bearings provide a strong, durable chassis foundation for millions of cycles of smooth operation.
  • Dual Backset Compatibility: Accommodates both 2-3/8" and 2-3/4" backsets for flexible installation across a wide range of door preparations.
  • 3-Hour Fire Rated: Certified for 3-hour fire-rated door assemblies, supporting code compliance in commercial and institutional applications.
  • Deadlocking Latch: Features a 1/2" deadlocking latch throw with a 1-1/8" x 2-1/4" front size for secure, positive latching performance.
  • ADA Compliant Lever Design: American lever style meets ADA accessibility requirements, ensuring compliance for public and commercial facilities.
  • 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 Specifications by 300%
  • UL Listed
  • 3-Hour Fire Rated
  • ADA Compliant
  • ANSI Function F109 (Entrance/Office)
  • Marks USA Lifetime Mechanical Warranty

Technical Specifications

  • Latch Throw: 1/2"
  • Product Group: Mechanical Locks
  • Product Subgroup: Bored Locksets
  • ANSI/BHMA: ANSI/BHMA, UL Listed
  • Commercial/Residential: Commercial
  • Function Description: Pushing and turning button on inside locks outside knob/lever requiring use of a key until button is manually unlocked.
  • Front Size: 1-1/8" x 2-1/4"
  • ADA Compliant: Yes
  • Keyed: Yes
  • ANSI Function: F109
  • Product Function: Entrance/Office
  • 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

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

Why Marks USA 175B?

Marks USA Survivor Series locksets are engineered to outlast conventional cylindrical hardware, with a patented stainless steel clutch mechanism and bronze roller bearing construction that together exceed BHMA Grade 1 cycle ratings by 300% — surpassing 3.6 million cycles. The 175B delivers professional-grade performance with 3-hour fire rating, ADA compliance, and a lifetime mechanical warranty, making it an ideal solution for demanding commercial entry applications where dependability and low maintenance are non-negotiable.

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:
Pushing and turning button on inside locks outside knob/lever requiring use of a key until button is manually unlocked.
Front Size:
1-1/8” x 2-1/4”
ADA Compliant:
Yes
Keyed:
Yes
ANSI Function:
F109
Product Attribute:
Cylindrical Locks
Product Function:
Entrance/Office
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 175B-26D – Frequently Asked Questions

1) Does the Marks 175B work with a 2-3/8 inch backset door prep, or only 2-3/4?
Both. The 175B is specified at a 2-3/4 inch backset and also accommodates 2-3/8 inch, which are the two standard bored-door backsets, so it goes into an existing 161 prep either way. Worth confirming which one your door was bored for before you order, since the latch is what has to match.
2) Will the Marks USA 175B latch into the strike that is already in my frame?
It depends on what strike is in there now. The 175B ships against an ANSI strike measuring 1-1/4 x 4-7/8 inches with a 1-1/4 inch lip and square corners, and the latch has a 1/2 inch throw with a 1-1/8 x 2-1/4 inch front. If your frame is already prepped for a full ANSI/ASA strike, it lines up. If the frame has a small T-strike or a round-corner face plate cutout, the frame prep will not match and you will be filing or ordering a different strike.
3) How does the F109 entry/office function on the Marks 175B actually operate day to day?
Push and turn the button on the inside and the outside lever locks, requiring a key until someone manually turns the button back. That is ANSI F109, the classic office lock: staff can secure the door from inside and leave it locked, and it stays locked until deliberately released rather than unlocking on the next inside turn. The inside lever always retracts the latch for free egress.
4) Can the Marks 175B go on a 3-hour fire rated door?
Yes, it is rated for 3-hour fire door assemblies and UL Listed, with a deadlocking latch, which is what a fire opening needs on the latch side. It also meets ADA for lever operation, so it covers both the fire and accessibility line items on a corridor or stair door in a school, hospital, or office building.
5) Is the Marks USA 175B Grade 1 or Grade 2?
The 175B is catalogued at Grade 2, and Marks rates the Survivor Series chassis past 3.6 million cycles, which they state exceeds BHMA Grade 1 cycle specifications by 300 percent. If your spec sheet says the lock itself must be ANSI/BHMA Grade 1 certified, the 175B does not carry that grade designation and you want a Grade 1 mechanical lock such as the Dorma C150 or C853 entry lever instead. If the concern is service life on a high traffic door, the cycle number is the number that matters.
6) Is the Orca OCL250 the same thing as the Marks USA 175B?
They land in the same place on a door but are not built the same. Both are Grade 2 cylindrical entrance locksets, and the OCL250 is keyed like the 175B. The OCL250 is rated medium duty. The 175B uses a stainless steel clutch that disengages the levers from the retractor when locked and cast retractors on bronze roller bearings, exceeding BHMA Grade 1 cycle specifications by 300 percent at over 3.6 million cycles, and it is 3-hour fire rated and ADA compliant. On a high-traffic entry or a fire-rated assembly, that difference is the deciding one.
7) I need Grade 1 on the spec sheet for an entry lever. What are my options besides the Marks USA 175B?
The 175B is listed Grade 2 and exceeds BHMA Grade 1 cycle specifications by 300 percent at over 3.6 million cycles, but if the drawing calls out a Grade 1 certification line item, the Dorma C853 is a Grade 1 keyed single cylinder entry lever covering 1-3/8 inch to 2-1/4 inch doors, and the Dorma C150 is a Grade 1 heavy-duty cylindrical lock in entrance/office function over the same thickness range.
8) What is the clutch mechanism on the Marks Survivor Series and does it stop lever droop?
The clutch is a stainless steel element that disconnects the levers from the retractor when the lock is secured. Hang on the outside lever of a locked door and you are turning a lever that is not pulling anything, so the abuse never reaches the chassis. Marks credits it with eliminating lever droop and it is the reason the cycle count runs where it does. On a school or multi-tenant corridor where people yank locked doors all day, that is the practical difference between this and a conventional cylindrical lock.
9) Should I use a mechanical entry lockset like the Marks 175B or go to an electronic keypad lock?
Use the 175B when the door needs a keyed entry/office lock on an existing key system and nothing else: it is a mechanical cylindrical lock, keyed, with no batteries, no codes, and no programming. Go electronic when you need to hand out codes instead of keys or track who came through. For codes without wiring, the Alarm Lock Trilogy T2 DL2700 holds 100 user codes and the BEST 9KZ EZ Series adds a key override. For an audit trail, the Alarm Lock T3 DL3075 records access. Those carry their own thickness limits, so check the door against them before switching.
10) Is the Marks 175B suitable for a high traffic apartment building or school entry door?
That is the application it is built around. Over 3.6 million cycles on cast retractors riding bronze roller bearings, with the clutch keeping abuse off the chassis, and it is designated commercial rather than residential. On a multi-tenant lobby door or a classroom wing where the lock gets hit hundreds of times a day, that cycle life is the argument for it over standard-duty cylindrical hardware.
11) Does the Marks 175B lever meet ADA requirements for a public building?
Yes. The American lever design on the 175B is ADA compliant, meaning it operates without tight grasping, pinching, or wrist twisting, which is what the accessibility requirement is aimed at. Combined with the 3-hour fire rating, it clears the two items most often flagged on an inspection of a public corridor door.
12) What is a simpler alternative to the 175B for a door that does not need to be keyed?
The 175B is a keyed entry lever. Where the opening only needs to latch and never locks, the Cal-Royal CAL30 Calypso is a Grade 1 passage lockset with a 1-3/8 inch to 2 inch door thickness range, and the Orca OCL210 is a Grade 2 medium duty passage lockset. On a door that needs an interior thumbturn rather than a key, the Orca OCL240 is a Grade 2 medium duty privacy lockset. For a lever that is trim only with no latch at all, the Orca OCL2170 is a Grade 2 half dummy.
13) What finishes does the Marks 175B entry lever come in?
Two chrome options: US26 polished chrome and US26D satin chrome. US26D is the usual choice for matching existing commercial hardware in offices, schools, and healthcare, since satin chrome hides wear and fingerprints better than the bright finish. Pick US26 only if the rest of the openings are already bright chrome.
14) What matches the Marks USA 175B lever on doors that only need trim?
On a pair of doors where one leaf is fixed or an inactive leaf carries a lever for appearance only, the Dorma C501 is a Grade 2 single dummy lever lockset for 1-3/8 inch to 1-3/4 inch doors, and the Dorma CL701 is a Grade 2 single dummy non-keyed lever in the CL700 Series. Both are trim without a latch, so they pair with the keyed 175B on the active leaf rather than replacing it.
How fast can I get the Marks USA 175B-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 175B-26D come with a warranty?
Absolutely. The Marks USA 175B-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 175B-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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