Marks USA MAR145KL 145KL Singl...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$273.37
$144.68
Marks USA 145KL Single Cylinder Deadbolt with Grade 1 Defender Cylindrical Cartridge Deadlatch, Cylinder x Lever, US26D Satin Chrome

Marks USA MAR145KL 145KL Single Cylinder Deadbolt with Grade 1 Defender Cylindrical Cartridge Deadlatch, Cylinder x Thumbturn

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Model: 145KL/32D
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$273.37
$144.68
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Marks USA 145KL Single Cylinder Deadbolt with Grade 1 Defender Cylindrical Cartridge Deadlatch, Cylinder x Thumbturn

The Marks USA 145KL is a commercial-grade single cylinder deadbolt featuring a Grade 1 Defender cylindrical cartridge deadlatch in a Cylinder x Thumbturn (KL) function configuration. Designed for 1-3/4" door thickness (with spacer rings K1442/32D available for 1-3/8" doors), this unitized assembly installs into a standard 2-1/8" bore and delivers a 9/16" throw latch with a 2-3/4" backset. Constructed with stainless steel components, the 145KL accepts Medeco, Kaba, Multilock, ASSA, and most other manufacturers' conventional, high security, and IC core cylinders, making it a versatile choice for commercial door security applications.

Key Features

  • ANSI Grade 1 Deadlatch: Deadlatch meets ANSI 156.5 Grade 1 standards and is UL fire rated for 3 hours, ensuring compliance in demanding commercial and fire-rated door applications.
  • ANSI Grade 1 Deadbolt: Deadbolt meets ANSI 156.5 Grade 1 standards (UL fire ratings not applicable to deadbolt function) for high-security performance.
  • Door Thickness Compatibility: Designed for 1-3/4" doors; compatible with 1-3/8" doors using spacer rings K1442/32D for flexible installation across door types.
  • Unitized Assembly for 2-1/8" Bore: Unitized design installs into a standard 2-1/8" bore for straightforward retrofits and new installations.
  • Broad Cylinder Compatibility: Accepts Medeco, Kaba, Multilock, ASSA, and most other manufacturers' conventional cylinders, as well as IC core models for "Best" size cores, providing maximum keying flexibility.
  • Tapered Cylinder Collars: Tapered cylinder collars prevent break-in attempts by wrenching, adding a critical layer of physical security to the installation.
  • Steel Shutter System: Integrated steel shutter system eliminates access to mounting screws when the door is locked, protecting against tampering and unauthorized removal.
  • Series 1 Cylindrical Cartridge: Features a Series 1 cylindrical cartridge design for reliable, consistent deadlatch operation in high-traffic commercial environments.
  • Marks "C" Keyway Cylinder: Supplied with a Marks "C" keyway, 6-pin cylinder and 2 keys for immediate out-of-box functionality.

Certifications & Compliance

  • ANSI 156.5 Grade 1 - Deadlatch
  • ANSI 156.5 Grade 1 - Deadbolt
  • UL Fire Rated 3 Hours - Deadlatch

Technical Specifications

  • Latch Front: 1" x 2-1/4"
  • Product Group: Mechanical Locks
  • Product Subgroup: Bored Locksets
  • Subcategory: Cylindrical Locks
  • Commercial/Residential: Commercial
  • Keyed: Yes
  • Product Function: Cylinder x Thumbturn
  • Latch Type Specification: Deadlocking
  • Keyway Profile: Marks C
  • Product Material: Stainless Steel
  • 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 145KL?

The 145KL combines stainless steel construction, tapered cylinder collars, and a steel shutter system to deliver professional-grade physical security for commercial door applications. The ANSI 156.5 Grade 1 rating on both the deadbolt and deadlatch, combined with a 3-hour UL fire rating on the deadlatch, confirms this lock meets the rigorous performance standards required for high-traffic, code-compliant commercial installations.

Manufacturer Resources

Marks USA Product Catalog

Product Specs

Latch Front:
1" x 2-1/4"
Grade:
Grade 1
Product Group:
Mechanical Locks
Product Subgroup:
Bored Locksets
Product Type:
Deadbolts
Subcategory:
Cylindrical Locks
Commercial/Residential:
Commercial
Keyed:
Yes
Function Description:
Single Cylinder Deadbolt
Product Attribute:
Deadbolts
Product Function:
Cylinder x Thumbturn
Latch Type Specification:
Deadlocking
Keyway Profile:
Marks C
Product Material:
Stainless Steel
Product Category:
Mechanical Locks
Backset (Distance):
2-3/4"
Department:
Door Hardware

Marks USA 145KL/32D – Frequently Asked Questions

1) Will the Marks USA 145KL deadbolt fit a 1-3/8 inch door, or is it 1-3/4 only?
The 145KL is built for 1-3/4 inch doors, which is the standard commercial thickness. For a 1-3/8 inch door you add the K1442/32D spacer rings and it installs fine. Anything outside those two thicknesses is not covered. If you are working a mixed building with thicker doors, the Corbin Russwin DL3011 covers 1-3/4 to 2-1/4 inches.
2) Does the Marks 145KL drop into an existing 2-1/8 inch bore?
Yes. The 145KL is a unitized assembly that goes into a standard 2-1/8 inch cross bore, so on a retrofit you are usually reusing the holes already in the door. Backset is where you have to be careful: order the 2-3/4 inch or the 2-3/8 inch version to match what is bored. Both are stocked. The latch front measures 1 x 2-1/4 inches, so check that against the existing latch mortise in the door edge.
3) Can I key the Marks 145KL into my existing Medeco or Best SFIC system?
Yes, and this is the main reason locksmiths spec the 145KL. It accepts Medeco, Kaba, Multilock, ASSA and most other manufacturers' conventional and high security cylinders, plus IC cores in the Best size. Out of the box it ships with a Marks C keyway 6-pin cylinder and two keys, so if you are keying it into an existing system you swap that cylinder for yours.
4) What is the difference between the Marks 145KL and a plain single cylinder deadbolt?
Most deadbolts are just a bolt. The 145KL is a two-part unit: the Grade 1 deadbolt plus a Grade 1 Defender cylindrical cartridge deadlatch with a 9/16 inch throw, in a cylinder x lever configuration. That means the door latches and holds closed on its own, and the deadbolt is a separate keyed throw on top. If all you need is the bolt on a door that already has a latching lockset, a straight deadbolt like the Dexter DB1000 single cylinder or the Delaney LM Series Grade 1 is the simpler buy.
5) Can the Marks 145KL go on a fire rated door?
The deadlatch on the 145KL is UL fire rated for 3 hours and meets ANSI 156.5 Grade 1. The deadbolt itself is ANSI 156.5 Grade 1, but UL fire ratings do not apply to the deadbolt function. So the latching side of the unit is what carries the fire rating, which is what matters on a rated opening.
6) Which backset do I order for the Marks USA 145KL?
Two backsets, 2-3/4 inch and 2-3/8 inch. Measure from the door edge to the center of the existing bore. 2-3/4 is the usual commercial backset and 2-3/8 the common residential one; on a retrofit the bore already decides it for you. Finish is the other choice on the order: US26D satin chrome, US32D stainless steel, US10B dark bronze, or US3 bright brass.
7) Which Grade 1 deadbolt should I use on a door thicker than 1-3/4 inch?
The Corbin Russwin DL3011 Grade 1 cylindrical deadlock covers 1-3/4 inch to 2-1/4 inch doors, which is the widest thick-door range in the commercial Grade 1 group. Note it is a cylinder x blank deadlock rather than a cylinder x thumbturn, so the inside face is blank plate and there is no turn to retract the bolt. The Marks USA 145KL is a cylinder x thumbturn function, so if the room side needs a turn the DL3011 is not a like-for-like function swap even though it takes the thicker door.
8) What is a Grade 1 alternative when the door needs a key on both sides instead of a thumbturn?
The Marks USA 145KL is a single cylinder deadbolt, keyed outside with a turn inside. For key-both-sides on a Grade 1 opening, the Design Hardware D1 Series is a Grade 1 extra heavy duty double cylinder deadbolt for 1-3/4 inch doors, and the Dexter DB1000 double cylinder is a Grade 1 double cylinder deadbolt covering 1-3/8 inch to 1-7/8 inch. Double cylinder function is restricted on egress doors in many jurisdictions, so confirm the opening is not a required means of egress before specifying either.
9) Which deadbolts take an interchangeable core if I am standardizing a facility on SFIC keying?
Three peers are built for cores rather than a fixed cylinder: the Arrow E61 26D IC is a Grade 2 single cylinder deadlock with SFIC prep supplied less core for 1-3/8 inch to 1-3/4 inch doors, the Deltana CL200LAIC is a Grade 2 cylinder x thumbturn interchangeable core deadbolt with a 2-3/4 inch backset, and the Delaney LM Series 301702 is a Grade 1 single cylinder less core deadbolt in dull chrome US26D. The Marks USA 145KL accepts IC core models for Best size cores as well as conventional cylinders from Medeco, Kaba, Multilock and ASSA, and ships with a Marks C keyway 6-pin cylinder, so it can be brought onto an existing core system rather than replaced.
10) Can a Hager 3115 or 3215 replace a Marks USA 145KL?
Not as a like-for-like on a Grade 1 spec. The Hager 3115 and 3215 are both Grade 2 single cylinder deadbolts in a cylinder x thumbturn function for 1-3/8 inch to 1-3/4 inch doors, fire rated, and supplied on a Schlage C keyway; the 3215 carries a 1 inch throw. The Hager Grade 1 counterpart is the 3118 classroom deadbolt, also Schlage C keyway with a 6-pin cylinder for 1-3/8 inch to 1-3/4 inch doors. The Marks USA 145KL is Grade 1 on a Marks C keyway, so any Hager swap changes the key system as well as the grade.
11) What is the alternative to the Marks USA 145KL if the door already has a latch and only needs a deadbolt added?
The Corbin Russwin DL3211 is a Grade 1 cylindrical deadlock in a cylinder x blank function for 1-3/4 inch doors, and the DL2211 is a Grade 1 cylindrical deadlock for the same 1-3/4 inch thickness in the DL2200 Series. Both are bolt-only units meant to sit above an existing latchset. The Marks USA 145KL carries its own Grade 1 Defender cylindrical cartridge deadlatch alongside the deadbolt, so it handles the latching duty itself rather than relying on a separate lockset.
12) How secure is the Marks 145KL against someone attacking the lock from outside?
Three things do the work here. Tapered cylinder collars stop a wrench getting purchase on the cylinder. A steel shutter system covers the mounting screws whenever the door is locked, so the unit cannot be unscrewed off the door. And the body is stainless steel. That plus the ANSI 156.5 Grade 1 rating on both the bolt and the latch is why it turns up on storefront and multi-tenant back doors.
13) Is a Grade 1 deadbolt like the Marks 145KL overkill for an apartment building, or should I use a Grade 2?
Traffic decides it. Grade 1 is the heaviest ANSI/BHMA commercial tier and the 145KL sits there on both the bolt and the latch, which is the right call for building entries, back-of-house doors, and anything a hundred people touch a day. For a lower-traffic unit door where you still want a keyed bolt, Grade 2 options include the Arrow DBX61 and the Cal-Royal CB160, which has a tamper-resistant cylinder guard. Bear in mind the Grade 2 units are deadbolts only; the 145KL includes the deadlatch as well.
14) What is the closest alternative to the Marks 145KL if I need a Grade 1 deadbolt with a fire rated latch?
The Cal-Royal CRB800 is the nearest match in the set, a Grade 1 heavy duty single cylinder deadbolt with a UL 3-hour fire rated latch in the same cylinder x thumbturn arrangement. Where the 145KL pulls ahead is cylinder flexibility, since it takes Medeco, Kaba, Multilock, ASSA and Best-size IC cores. If your keying is already standardized on Schlage C, the Hager 3118 is a Grade 1 classroom deadbolt with a Schlage C keyway 6-pin cylinder for 1-3/8 to 1-3/4 inch doors.
15) Does the Marks 145KL deadbolt need a key on both sides?
No, it is single cylinder: key outside, thumbturn inside. That matters for egress, since the inside always releases by turn without a key. If your local code or insurance calls for a double cylinder on a glass door, look at the Design Hardware D1 Series Grade 1 double cylinder for 1-3/4 inch doors or the Dexter DB1000 double cylinder for 1-3/8 to 1-7/8 inch.
16) Is there a lighter duty alternative to the Marks USA 145KL for a low traffic opening?
Yes. Where a Grade 1 commercial deadbolt is more than the opening needs, the Cal-Royal CB160 is a Grade 2 cylinder x thumbturn single cylinder deadbolt with a tamper-resistant cylinder guard, the Dexter DB2000 single cylinder is Grade 2 cylinder x thumbturn for 1-3/8 inch to 1-3/4 inch doors, and the Cal-Royal ED500 is a Grade 3 single cylinder deadbolt with an adjustable backset for the same 1-3/8 inch to 1-3/4 inch range. The 145KL stays the choice where the specification calls for Grade 1 on a commercial opening.
17) What should I use instead of the Marks USA 145KL if the opening needs to be non-keyed on the exterior?
The Arrow E60 is a Grade 2 exit deadlock in a blank plate x thumbturn function for 1-3/8 inch to 1-3/4 inch doors, meaning the outside face carries no cylinder and the bolt is thrown only from the inside turn. The Callan 205S is a Grade 3 one-sided half-bore deadbolt for the same idea on a lighter opening. The 145KL is a keyed lock in a cylinder x thumbturn function, so neither of these is a substitute where a key must operate the bolt from the corridor side.
18) What is the difference between the Marks USA 145KL and the Cal-Royal CRB800?
Both are heavy duty commercial single cylinder deadbolts in a cylinder x thumbturn function with a UL 3-hour fire rated latch. The Cal-Royal CRB800 is a Grade 1 heavy duty single cylinder deadbolt in the CRB800 Series. The Marks USA 145KL pairs its Grade 1 deadbolt with a Grade 1 Defender cylindrical cartridge deadlatch that carries the UL 3-hour rating, uses a 2-3/4 inch backset with a 1 inch by 2-1/4 inch latch front, and is built in stainless steel with a deadlocking latch. The CRB800 is the closer alternative if the Marks C keyway is not wanted on the job.
19) Which deadbolt looks like a substitute for the Marks USA 145KL but is not?
A few in the same family will not drop into the same opening. The Arrow 460 is a mortise lock strike for latchbolt and deadbolt functions, not a lock at all. The BEST 8T is a tube component of a T Series tubular deadbolt rather than a complete assembly, and the Baldwin 8BR0618001 is a deadbolt spacer. The Codelocks CL200 is a surface deadbolt with key override in a light duty rating, and the CL2210 is an electronic mortise deadbolt, both of which change how the door is prepped and operated. The Marks USA 145KL is a complete keyed deadbolt assembly for a bored door.
20) What deadbolt should I look at instead of the Marks USA 145KL if the opening needs credential or code access rather than a key?
For electronic access on a deadbolt opening, the Dormakaba Saffire LX-D is an RFID electronic deadbolt with BLE and electronic lock override, the Dormakaba Nova-D is an RFID multihousing smart electronic deadbolt, the Codelocks CL2200 is a medium duty electronic surface deadbolt in brushed steel, and the Delaney KP400 is a Grade 2 electronic deadbolt with a programmable remote. For an electrically controlled bolt tied into access control, the DynaLock 1300 Series is a heavy duty mortise electric deadbolt. The Marks USA 145KL is a mechanical keyed lock, so any of these changes the credential and adds a power requirement.
21) Is a Falcon D111 or D211 the same thing as a Marks USA 145KL?
They are close but not identical. The Falcon D111 is a Grade 1 heavy duty classroom deadbolt in the D100 Series with an adjustable backset and a cylinder x thumbturn function; the D211 is the Grade 2 medium duty version in the D200 Series. Classroom function means the bolt is intended to be thrown and retracted by key from outside for lockdown practice, while the Marks USA 145KL is a single cylinder deadbolt with a Grade 1 Defender cylindrical cartridge deadlatch and a tapered cylinder collar and steel shutter system that blocks the mounting screws when locked. Confirm which function the door schedule calls for before swapping.
22) Which deadbolt has an easier thumbturn for an ADA-sensitive opening?
The Cal-Royal LSD is a Grade 3 single cylinder deadbolt with an ADA ergonomic thumbturn, covering 1-3/8 inch to 1-3/4 inch doors in a cylinder x thumbturn function. It is the option to look at where the turn itself has to be operable without tight grasping. The Marks USA 145KL is a Grade 1 commercial deadbolt in the same cylinder x thumbturn function, so where the specification demands Grade 1 the 145KL holds and the thumbturn question should be resolved with the door schedule.
23) What deadbolt would I use on a narrow or aluminum storefront style opening instead of a bored deadbolt?
The Emtek 2050 and 2051 are European mortise deadbolts with an integrated roller latch in a cylinder x thumbturn function, square and round trim respectively, and the Dormakaba D900 is a small case mortise deadbolt with a D cylinder, keyed different on SC keyways. The Detex DX Series is a hinge side locking deadbolt with multi-point security. All of these mortise or surface mount rather than using a bored hole; the Marks USA 145KL is a unitized assembly for a standard 2-1/8 inch bore, so it needs a cross-bore the mortise units do not.
24) Can I match the Marks 145KL to the stainless hardware already on my other doors?
Four finishes cover most commercial specs: US26D satin chrome and US32D stainless steel for the typical brushed look, US10B dark bronze, and US3 bright brass. US32D is the usual match for stainless push plates and hinges; US26D is the common match for satin chrome levers and closers.
25) Is the Marks 145KL a residential deadbolt or a commercial one?
Commercial. It is spec'd for office buildings, schools, healthcare, retail, warehouses, multi-tenant residential and government facilities. The stainless steel build, Grade 1 rating and 3-hour fire rated deadlatch are what put it in that category rather than a home entry door. For residential-grade work the Bravura 310B Elite or the Cal-Royal ED500 with adjustable backset are the lighter Grade 2 and Grade 3 options.
How fast can I get the Marks USA 145KL/32D 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 145KL/32D come with a warranty?
Absolutely. The Marks USA 145KL/32D 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 145KL/32D?
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