Marks USA 110AB Entry Knob Loc...
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Marks USA Marks USA 110AB Entry Knob Lockset - Grade 2, Round Knob 110AB

Marks USA 110AB Entry Knob Lockset — Grade 2, Round Knob, 2-3/8" Backset, Satin Stainless Steel

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Model: 110AB-32D-E4
$248.00
$124.31
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$248.00
$124.31
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Marks USA 110AB Entry Knob Lockset — Grade 2 Cylindrical Knobset with 3-Hour Fire Rating

The Marks USA 110AB is a BHMA-certified Grade 2 cylindrical entry knob lockset engineered for commercial door applications. Featuring a 2-3/8" backset, a 2-1/4" diameter round knob, and a door thickness range of 1-5/8" to 1-7/8", this lockset delivers reliable entrance and office security. The unit is finished in Satin Stainless Steel and meets ANSI-A 156.2 Grade 2 Plus with a 3-Hour Fire Rating, making it suitable for fire-rated door assemblies in demanding commercial environments.

Key Features

  • Backset & Door Compatibility: Standard 2-3/8" backset accommodates door thicknesses from 1-5/8" to 1-7/8"; optional E4 configuration provides a 2-3/4" backset with 1-1/8" x 2-1/4" face for alternate door preparations.
  • Round Knob Design: 2-1/4" diameter (110 Series) round knob in Satin Stainless Steel finish; steel-reinforced adjustable roses on both sides measure 2-3/4" diameter for a secure, finished appearance.
  • Deadlocking Latch Assembly: Latch #1138 features a 1" x 2-1/4" front with a 1/2" throw and a Stainless Steel nose for dependable deadlocking performance on every cycle.
  • Entrance/Office Function (ANSI F109): Pushing and turning the interior button locks the outside knob, requiring a key for re-entry until the button is manually unlocked — ideal for office and entrance security applications.
  • Secure Cylinder: Marks "C" Keyway, 6-pin cylinder supplied with 2 keys for immediate deployment and reliable key control.
  • T-Strike Included: Strike #1136, 2-3/4" "T" Strike (1-1/8" x 2-3/4", 1-1/8" lip, square corner) included for complete installation readiness.
  • BHMA Certified & Fire Rated: Meets ANSI/BHMA A156.2 Grade 2 Plus with a 3-Hour Fire Rating and UL Listed compliance for use on fire-rated door assemblies.

Certifications & Compliance

  • ANSI/BHMA A156.2 Grade 2 Plus
  • 3-Hour Fire Rating
  • BHMA Certified
  • UL Listed

Technical Specifications

  • 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: Pushing and turning button on inside locks outside knob/lever requiring use of a key until button is manually unlocked.
  • Series: 110 Series
  • Keyed: Yes
  • ANSI Function: F109
  • Product Attribute: Cylindrical Locks
  • Product Function: Entrance/Office
  • Latch Type Specification: Deadlocking
  • Strike Classification: T-Strike, 1-1/8" x 2-3/4", 1-1/8" Lip, Square Corner
  • Product Category: Mechanical Locks
  • 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 110 Series?

Marks USA 110 Series cylindrical knobsets are built to commercial-grade standards, combining a steel-reinforced rose assembly, a Stainless Steel deadlocking latch nose, and a 6-pin Marks "C" Keyway cylinder for robust, long-term performance. BHMA-certified to ANSI/BHMA A156.2 Grade 2 Plus with a 3-Hour Fire Rating and UL Listing, the 110AB is engineered to meet the security and life-safety demands of high-traffic commercial door openings.

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.
Series:
110 Series
Front Size:
1-1/8” x 2-1/4”
Keyed:
Yes
ANSI Function:
F109
Product Attribute:
Cylindrical Locks
Product Function:
Entrance/Office
Latch Type Specification:
Deadlocking
Strike Classification:
T-Strike, 1-1/8" x 2-3/4", 1-1/8" Lip, Square Corner
Product Category:
Mechanical Locks
Backset (Distance):
2-3/4"
Department:
Door Hardware

Marks USA 110AB-32D-E4 – Frequently Asked Questions

1) Will the Marks 110AB fit a 1-3/4 inch commercial door?
Yes. The 110AB knob lockset covers doors from 1-5/8 inch to 1-7/8 inch thick, so standard 1-3/4 inch commercial doors are right in the middle of the range. Thinner residential doors at 1-3/8 inch are outside it, and for those you would want a lockset with a wider range like the Cal-Royal CAL20 family at 1-3/8 to 2 inches.
2) What does F109 entrance/office function actually do on a Marks 110AB?
Push and turn the button on the inside knob and the outside knob locks. It stays locked and takes a key from outside until somebody manually unlocks the button, so it does not release automatically when you turn the inside knob. That is the behavior you want on an office or a tenant suite door where the occupant sets it once and leaves. If you need a door that relocks itself every time it closes, F109 is the wrong function.
3) Can I use the Marks 110AB on a fire rated door?
Yes. The 110AB carries a 3-Hour Fire Rating and is BHMA certified to ANSI/BHMA A156.2 Grade 2 Plus, UL Listed. The 1/2 inch deadlocking latch is what makes that work, since the latch deadlocks on every close rather than relying on a secondary bolt.
4) Will the Marks 110AB latch into the strike already in my frame?
It depends what is in the frame now. The 110AB ships with a T-strike, 1-1/8 x 2-3/4 inches with a 1-1/8 inch lip and square corners, and the latch throws 1/2 inch. If your frame is prepped for a full ANSI strike (4-7/8 x 1-1/4 inch), the included T-strike will not cover that cutout and you will see the old mortise around it. Frames cut for the ANSI size are better matched by something like the Stanley QCL150, which is supplied with the 4-7/8 x 1-1/4 inch ASA strike.
5) Can I order the Marks 110AB without a cylinder so I can use my building's own keyway?
Yes, three cylinder choices are offered. The standard build is a 6-pin conventional cylinder in the Marks C keyway. You can also order it Less Cylinder, or IC Less Core if your facility is standardized on interchangeable cores and you will supply your own. If you go with either less-cylinder option, the keying selection is set to None; the C keyway version is where you specify keyed different or keyed alike.
6) Can I replace the 110AB with a keypad lock and eliminate keys on that opening?
Yes, several cylindrical keypad locks share the bored 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 it fits the same 1-5/8 inch to 1-7/8 inch door thickness the Marks USA 110AB is built for. The Alarm Lock DL5200 is a double-sided electronic cylindrical lock for the same 1-5/8 inch to 1-7/8 inch range. The Schlage NDEB is a Grade 1 ENGAGE Series wireless cylindrical lock with storeroom, office, privacy, and apartment functions for 1-5/8 inch to 2 inch doors. The 110AB is purely mechanical with a push-and-turn button, so it needs no batteries or programming.
7) What is a Grade 2 entrance lockset with a lever instead of a knob for ADA-sensitive openings?
The Marks USA 110AB is a Grade 2 cylindrical entrance/office lockset with a round knob. For a lever trim in the same Grade 2 entrance class, the Orca Hardware OCL250 is a Grade 2 entrance cylindrical lockset, and the Stanley Security QCL100 Series QCL150 is a Grade 2 entrance lever with a Sierra bent lever on a rose, supplied less cylinder with a square 2-3/4 inch backset latch and a 4-7/8 inch x 1-1/4 inch ASA strike. Note the 110AB ships with a T-strike measuring 1-1/8 inch x 2-3/4 inch with a 1-1/8 inch lip, so a QCL150 swap into an existing frame prepped for the T-strike would need the frame reworked for the ASA strike.
8) If I need a heavier duty entrance lock than a Grade 2 knobset, what is the Grade 1 equivalent?
The Marks USA 110AB is a Grade 2 cylindrical entrance/office lockset. For the same entrance/office function in Grade 1, the Dorma C150 is a Grade 1 heavy-duty cylindrical lock with entry/office function covering doors 1-3/8 inch to 2-1/4 inch thick. The Dorma C853 is also Grade 1 with an entrance function and the same 1-3/8 inch to 2-1/4 inch door thickness range, keyed single cylinder with lever trim. Both cover a wider door thickness range than the 110AB, which is built around a 1-5/8 inch to 1-7/8 inch door.
9) I have a small format interchangeable core system already. Does the 110AB work, or do I need a different lock?
The Marks USA 110AB can be ordered in an IC less core configuration in either 2-3/8 inch or 2-3/4 inch backset, so it drops into an existing core program without a Marks C keyway cylinder. It is also offered less cylinder entirely if you are supplying your own. If you want the same core program on an access-controlled opening, the Alarm Lock Trilogy T2 DL2700 is a Grade 1 standalone electronic cylindrical entrance lock listed as IC/SFIC compatible, and the BEST 9KZ EZ Series is an electronic keypad cylindrical lock with a key override function.
10) I manage a building with several 110AB locks. Can I have them all open with one key?
Yes. Keying is a required selection when you order, and Keyed Alike puts every lock on the same key so one master opens the group. Keyed Different gives each opening its own key. Both apply to the 6-pin Marks C keyway cylinder version; if you order Less Cylinder or IC Less Core, keying is handled when your locksmith supplies the cores.
11) Is a Grade 2 knob lockset like the Marks 110AB enough for a high traffic entrance, or should I step up to Grade 1?
For office doors, tenant suites and interior entrances the 110AB works: it is Grade 2 Plus, commercial rated, with a steel-reinforced rose on both sides and a stainless steel deadlocking latch nose. On an exterior main entrance or a heavily abused opening, a Grade 1 cylindrical is the better call, and the Dorma C150 is the direct Grade 1 entry/office equivalent with a wider 1-3/8 to 2-1/4 inch door thickness range.
12) Is the Marks 110AB a knob or a lever, and does it meet ADA?
The 110AB is a round knob, 2-1/4 inches in diameter, on 2-3/4 inch adjustable roses. Knobs generally do not satisfy accessible-route operating hardware requirements, so if the opening is on an accessible path you want a lever instead. Comparable lever options include the Dorma C853 entry lever or the Stanley QCL150 entry lever.
13) What comes in the box with the Marks 110AB, and what else do I need to buy?
You get the knob set with roses both sides, the #1138 deadlocking latch with a 1 x 2-1/4 inch front and 1/2 inch throw, and the #1136 T-strike. On the standard build the 6-pin C keyway cylinder and two keys are included. If you order it IC Less Core or Less Cylinder you supply that yourself. The door needs a standard bored prep at the backset you ordered.
14) I do not need a key on this door. What is the simpler version of the 110AB?
The Marks USA 110AB is keyed with a 6-pin Marks C keyway cylinder and an F109 entrance/office function. If the opening only needs to latch without locking, 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 lock for doors 1-3/8 inch to 2 inch. For a bath or bedroom that locks from inside without a key, the Orca OCL240 is a Grade 2 privacy lockset and the Cal-Royal CAL20 is a Grade 1 privacy lock. None of those carry a cylinder, so they cannot be keyed into a master system the way the 110AB can.
15) Is the Lockey 1600 keyless knob lock a substitute for the Marks 110AB?
They are not the same thing. The Marks USA 110AB is a keyed cylindrical entrance/office lockset with a 6-pin Marks C keyway and an inside push-button. The Lockey 1600 is a heavy duty mechanical keyless knob lock with an adjustable backset for doors 1-1/8 inch to 2 inch, entered by mechanical code rather than a key, so it will not accept a cylinder or join an existing Marks keyway system. The Lockey 2830 is a related mechanical pushbutton keyless knob lock with an auto-locking passage function over the same 1-1/8 inch to 2 inch range. Choose the 110AB when the opening has to key into a master system.
16) What looks like a cylindrical lockset but will not actually latch or lock the door?
Dummy trim. The Dorma C501 is a single dummy trim keyless lever lockset, Grade 2, for 1-3/8 inch to 1-3/4 inch doors, the Dorma CL701 is a Grade 2 single dummy non-keyed lever, and the Orca OCL2170 is a Grade 2 half dummy lever. All three are fixed trim with no latch. The Marks USA 110AB is a working keyed lockset with a deadlocking #1138 latch, 1/2 inch throw, and a stainless steel latch nose.
17) For a classroom or school opening, is the 110AB the right function or should I use something else?
The Marks USA 110AB is an F109 entrance/office lock, locked by pushing and turning the inside button, which means it can be left locked from inside and is not a classroom function. For classroom and intruder applications, the TownSteel XCE-9000 is a Grade 1 electronic classroom intruder cylindrical lockset with keypad for 1-3/4 inch to 2 inch doors, the TownSteel FCE-4000 is a Grade 1 RFID electronic intruder classroom lockset for 1-3/4 inch doors, and the Schlage XE360M is a Grade 1 wireless tubular lock with a classroom/storeroom function for 1-3/4 inch doors.
18) I need the door to unlock from an access control panel. Is there a cylindrical lock that does that?
The Marks USA 110AB is a mechanical entrance/office lockset with no electrical connection. For a cylindrical lock that can be released by a panel, 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 thick. If you want standalone credential control instead of a wired panel, the SDC E75 Series is a battery-powered electronic cylindrical lockset with keypad access control for 1-3/4 inch to 2-1/8 inch doors.
19) Do I need to specify handing for the Marks 110AB knob lockset?
No. The 110AB is a cylindrical bored knobset with identical round knobs and adjustable roses on both faces, so it is non-handed and works on a left or right hand door without changing anything. Just get the backset right, 2-3/8 or 2-3/4 inch, to match the bore in the door.
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Does the Marks USA 110AB-32D-E4 come with a warranty?
Absolutely. The Marks USA 110AB-32D-E4 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 110AB-32D-E4?
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