Marks USA MAR145K 145K Single ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$170.60
$89.85
Marks USA 145K Single Cylinder Deadbolt - Grade 1 Defender Cylindrical Cartridge Deadlatch

Marks USA MAR145K 145K Single Cylinder Deadbolt with Grade 1 Defender Cylindrical Cartridge Deadlatch

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Model: 145K/32D-E11
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$170.60
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Marks USA 145K Single Cylinder Deadbolt with Grade 1 Defender Cylindrical Cartridge Deadlatch

The Marks USA 145K is a commercial-grade single cylinder deadbolt featuring a Series 1 cylindrical cartridge design that installs easily and accepts most manufacturers' conventional, high security, and IC core cylinders. Rated ANSI 156.5 Grade 1, the deadlatch carries a UL fire rating of 3 hours, while the deadbolt meets ANSI 156.5 Grade 1 standards. Designed for 1-3/4" door thickness with a 2-3/4" backset and a 9/16" latch throw, the 145K delivers robust security for demanding commercial applications. Unitized assemblies are engineered for a 2-1/8" bore, and spacer rings K1442/32D are available for use with 1-3/8" doors.

Key Features

  • ANSI 156.5 Grade 1 Rated: Both the deadbolt and deadlatch meet ANSI 156.5 Grade 1 standards, ensuring top-tier performance for commercial door security applications.
  • UL Fire Rated Deadlatch: The deadlatch is UL fire rated for 3 hours, providing critical compliance for fire-rated door assemblies in commercial buildings.
  • Broad Cylinder Compatibility: Accepts Medeco, Kaba, Multilock, ASSA, and other high security cylinders, as well as most manufacturers' conventional cylinders and IC core models for "Best" size cores.
  • Unitized Assembly for 2-1/8" Bore: Designed for straightforward installation in standard 2-1/8" bore preparations; spacer rings K1442/32D allow use on 1-3/8" doors.
  • 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: An integrated steel shutter system eliminates access to mounting screws when the door is locked, protecting against tampering and unauthorized removal.
  • Multiple Function Options: Available in six functions — K (Cylinder x Turnpiece), L (Communicating Single Cylinder), M (Double Cylinder), KL (Cylinder x Lever), X (Turnpiece x Blank Plate), and KK (Cylinder x Knob) — for versatile application configurations.
  • Multiple Finish Options: Available in Bright Brass (3), Stainless Steel (32D), Dark Bronze (10B), and Satin Chrome (26D) to complement a wide range of architectural aesthetics.

Certifications & Compliance

  • ANSI 156.5 Grade 1 — Deadbolt
  • ANSI 156.5 Grade 1 — Deadlatch
  • UL Fire Rated 3 Hours — Deadlatch
  • Commercial Grade Hardware

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 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 145K?

Marks USA 145K deadbolts are engineered for professional-grade security with tapered cylinder collars that resist wrenching attacks and a steel shutter system that conceals mounting screws when locked. With ANSI 156.5 Grade 1 certification, a 3-hour UL fire rating on the deadlatch, and broad compatibility with high security cylinders from Medeco, Kaba, Multilock, and ASSA, the 145K is a dependable choice for commercial door security where performance and versatility are essential.

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 145K/32D-E11 – Frequently Asked Questions

1) Will the Marks USA 145K deadbolt fit a 1-3/8 inch door, or only 1-3/4 inch?
The 145K is built for 1-3/4 inch doors as standard. For a 1-3/8 inch door you add the K1442/32D spacer rings, which Marks offers for exactly that purpose. The unitized assembly drops into a 2-1/8 inch bore, so on a door already prepped for a standard cylindrical lock you are not drilling a new hole, just adding the spacers if the leaf is thin.
2) Can I put a Medeco or Best IC core in the Marks USA 145K deadbolt?
Yes. The Series 1 cylindrical cartridge in the 145K accepts most manufacturers' conventional cylinders, high security cylinders from Medeco, Kaba, Multilock and ASSA, and IC cores in the "Best" size. As supplied it is keyed to the Marks C keyway, so if you are pinning it into an existing high security system you are swapping the cylinder rather than living with the factory keyway.
3) Will the Marks 145K deadbolt line up with the strike already in my frame?
It depends on two numbers. The 145K uses a 2-3/4 inch backset with a 9/16 inch bolt throw and a 1 x 2-1/4 inch latch front. If the door you are replacing was prepped at 2-3/8 inch backset, the bore center is in the wrong place and the 145K will not drop in. Where the existing bolt hole in the frame was cut for a longer throw you will still catch, but the strike lip and box need to suit a 1 x 2-1/4 inch front.
4) Can I use the Marks 145K on a fire rated door?
The deadlatch component carries a UL fire rating of 3 hours, and both the deadbolt and the deadlatch are rated ANSI 156.5 Grade 1. That is the combination a fire door assembly in a commercial corridor or stair typically needs on the hardware side.
5) The Marks 145K is keyed outside and thumbturn inside - what do I use if I need key on both sides?
The 145K single cylinder configuration is cylinder x thumbturn. For a double cylinder opening, keyed both sides, the Design Hardware D1 Series is a Grade 1 extra heavy duty double cylinder deadbolt for 1-3/4 inch doors, the Dexter DB1000-DCT is a Grade 1 double cylinder deadbolt for 1-3/8 to 1-7/8 inch doors, and the Delaney LU Series 320601 is a Grade 2 double cylinder deadbolt in stainless steel US32D. The Hager 3214 is a Grade 2 double cylinder deadbolt with Schlage C keyway for 1-3/8 to 1-3/4 inch doors.
6) Which single cylinder deadbolt also carries a UL 3-hour fire rated latch like the Marks 145K?
The Marks USA 145K pairs a Grade 1 deadbolt with a Defender deadlatch that is UL fire rated for 3 hours. Among comparable commercial deadbolts, the Cal-Royal CRB800 is a Grade 1 heavy duty single cylinder deadbolt with a UL 3-hour fire rated latch, making it the direct counterpart when the door assembly requires a fire rated latching deadbolt rather than a plain deadbolt. Hager also lists fire rating on its 3115, 3118, 3215 and 3214 cylinder x thumbturn deadbolts for 1-3/8 to 1-3/4 inch doors.
7) I need a thumbturn only deadbolt with no key on the outside - what replaces the 145K there?
The Marks USA 145K is a keyed single cylinder deadbolt. For a non-keyed exit application the Arrow E60 is a Grade 2 exit deadlock, non-keyed, blank plate x thumbturn, for 1-3/8 to 1-3/4 inch doors. For a one-sided opening the Callan Model 205S is a Grade 3 one-sided half-bore deadbolt, which preps into a half bore rather than a through bore.
8) Is a Corbin Russwin DL3011 or DL3211 deadlock a substitute for a Marks 145K deadbolt?
They are close but not interchangeable in trim. The Marks USA 145K is cylinder x thumbturn, keyed outside with a turn inside. The Corbin Russwin DL3011 in the DL3000 Series and the DL3211 in the DL3200 Series are Grade 1 cylindrical deadlocks configured cylinder x blank, with no inside turn, and the DL2211 in the DL2200 Series is likewise cylinder x blank. If the room needs to be unlocked from inside without a key, the cylinder x blank configuration will not do it. Door thickness also differs: DL3011 covers 1-3/4 to 2-1/4 inch, while DL3211 and DL2211 are 1-3/4 inch.
9) The 145K takes an IC core - which other deadbolts are prepped for interchangeable core?
The Marks USA 145K accepts most manufacturers' conventional and IC core cylinders including Best size cores, plus Medeco, Kaba, Multilock and ASSA high security cylinders. If you are standardizing a facility on interchangeable core, the Arrow E61 26D IC is a Grade 2 single cylinder deadlock with SFIC prep less core for 1-3/8 to 1-3/4 inch doors, the Deltana CL200LAIC is a Grade 2 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.
10) Will a mortise deadbolt work in place of the Marks 145K bored deadbolt?
No, the door prep is different. The Marks USA 145K is a cylindrical unitized assembly engineered for a 2-1/8 inch bore. Mortise deadbolts require a pocket cut into the door edge instead: the Dormakaba D900 small case mortise deadbolt is cylinder x thumbturn with SC keyways keyed different, the Emtek 2050 and 2051 are European mortise deadbolts with an integrated roller latch in square and round trim, and the DynaLock 1300 Series is a heavy duty mortise electric deadbolt. Choosing any of these means re-prepping the door rather than reusing the existing bore.
11) My doors are 1-3/8 inch - which deadbolts cover that thickness without adding spacers?
The Marks USA 145K is designed for 1-3/4 inch doors and uses spacer rings K1442/32D for 1-3/8 inch doors. Deadbolts that list 1-3/8 inch within their standard range include the Accentra D111 at Grade 1 for 1-3/8 to 1-3/4 inch, the Dexter DB1000-SCT at Grade 1 for 1-3/8 to 1-7/8 inch, the Dexter DB2000-SCT at Grade 2 for 1-3/8 to 1-3/4 inch, the Hager 3215 for 1-3/8 to 1-3/4 inch, and the Deltana 7312KA2 Grade 3 for 1-3/8 to 2 inch.
12) What Grade 1 deadbolt should I standardize on across a facility with mixed door thicknesses?
The Marks USA 145K is Grade 1 with a 2-3/4 inch backset, built for 1-3/4 inch doors with K1442/32D spacer rings extending it to 1-3/8 inch. For a facility with a wider spread of thicknesses, Grade 1 peers with broader published ranges are the Corbin Russwin DL3011, which covers 1-3/4 to 2-1/4 inch, and the Dexter DB1000-SCT, which covers 1-3/8 to 1-7/8 inch. The Falcon D111 Grade 1 heavy duty deadbolt has an adjustable backset if the existing preps are not all on the same centerline. Note the DL3011 is configured cylinder x blank rather than cylinder x thumbturn.
13) What is the difference between the K, M, L and KL functions on the Marks 145 deadbolt?
Six functions run on the 145 body and the choice is made when you order. K is cylinder outside, turnpiece inside, which is what the 145K is. M is double cylinder, keyed both sides, for a door with glass beside it (check your local egress code before specifying it). L is a communicating single cylinder. KL puts a lever on the inside instead of a turnpiece, X is a turnpiece with a blank plate outside for a door that is never keyed from the exterior, and KK gives you a knob on the inside face.
14) How does the Marks 145K resist someone attacking the deadbolt from outside?
Two things do the work. The cylinder collars are tapered so a wrench or pliers cannot get purchase to twist the cylinder out, and a steel shutter system covers the mounting screws whenever the door is locked, so the assembly cannot be unscrewed off the face of the door. The body is stainless steel.
15) Is there a Grade 1 commercial deadbolt with a UL fire rated latch besides the Marks 145K?
The Cal-Royal CRB800 Series is the closest peer we carry, a heavy duty single cylinder deadbolt with a UL 3-hour fire rated latch in the same cylinder x thumbturn function. Delaney's LM Series is Grade 1 cylinder x thumbturn and ships less core, so it suits a job already standardized on an IC core system. Deltana's CL200LM is another Grade 1 single cylinder option in the same function.
16) What is a lighter duty alternative to a Grade 1 commercial deadbolt for an interior or low traffic door?
Where the opening does not demand a Grade 1 commercial deadbolt like the Marks USA 145K, Grade 2 cylinder x thumbturn deadbolts cover the same function: the Arrow DBX61 in the DBX Series, the Cal-Royal CB160 with a tamper-resistant cylinder guard, the Dexter DB2000-SCT for 1-3/8 to 1-3/4 inch doors, the Falcon D211 medium duty in the D200 Series, and the Deltana CL200LA with a 2-3/4 inch backset. Grade 3 options include the Cal-Royal ED500 with adjustable backset and the Cal-Royal LSD with an ADA ergonomic thumbturn, both for 1-3/8 to 1-3/4 inch doors.
17) Is the Arrow 460 strike or the BEST 8T tube a substitute for a Marks 145K deadbolt?
Neither is a lock. The Marks USA 145K is a complete single cylinder deadbolt assembly. The Arrow 460 is a mortise lock strike for latchbolt and deadbolt functions with a straight lip, the part that mounts in the frame. The BEST 8T is a tubular deadbolt tube component from the T Series, a piece of a lock rather than a finished one. Ordering either expecting a working deadbolt leaves the opening without a lock.
18) Are residential decorative deadbolts an equivalent to the Marks 145K on a commercial opening?
They serve a different opening. The Marks USA 145K is a commercial deadbolt at Grade 1. Decorative options such as the Emtek #11 Tuscany lost wax cast bronze deadbolt, the Emtek 8323 Modern Disc double cylinder in brass, the Baldwin Estates 8011 contemporary 1-5/8 inch double cylinder deadbolt, and the Baldwin Reserve contemporary round and square double cylinder deadbolts are built around finish and trim styling. The Brinks Raleigh and Mendocino series single cylinder deadbolts offer a 4-way adjustable backset for varied residential preps. Where the specification calls for Grade 1 commercial performance, match the 145K against Grade 1 peers instead.
19) I need more than a single point deadbolt on an exterior exit door - what should I look at instead of the 145K?
The Marks USA 145K throws a single deadbolt into the strike. Where the opening calls for more than one locking point, the Detex DX Series is a hinge side locking deadbolt with multi-point security, securing the hinge edge as well. That is a different door prep and a different frame condition than a standard 2-1/8 inch bore deadbolt, so confirm the door and frame will take it before substituting.
20) Which finish of the Marks 145K deadbolt matches the rest of my building's hardware?
Three cylinder finish choices are offered: US3 bright brass, US32D stainless steel, and a US10 satin bronze cylinder paired with a 630/US32D body. On a building already standardized on brushed stainless trim, US32D is the match; US3 suits older brass-trimmed openings.
21) Does the Marks 145K deadbolt have a handing, and does it work on a pair of doors?
No handing to specify. It is a bored cylindrical deadbolt, symmetrical, so it goes on a left or right hand door without changing anything. On a pair, it throws into the frame or the inactive leaf like any single point bolt, which means it secures one leaf only; the second leaf needs its own bolting.
22) Is the deadbolt on the Marks 145K deadlocking, and what does that mean on a commercial opening?
The latch is specified as deadlocking, meaning that once thrown it cannot be pushed back into the case by a card or shim from outside. Paired with the 9/16 inch throw and the Grade 1 rating, that is the security level expected on tenant entries, storage rooms and back-of-house doors in commercial buildings.
How fast can I get the Marks USA 145K/32D-E11 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 145K/32D-E11 come with a warranty?
Absolutely. The Marks USA 145K/32D-E11 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 145K/32D-E11?
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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