Name: Medeco 11R53 Maxum M3 Double Cylinder Deadbolt with Captive Key, DL Keyway - UL 437 Listed
Brand: Medeco
SKU: 11R536T-26-DLT
Price: 353.74 USD
Availability: InStock
Rating: 5 (1 reviews)

Product Overview
FAQs

Medeco 11R53 Maxum Double Cylinder Deadbolt with Captive Key, DL Keyway

The Medeco 11R53 Maxum is a high-security double cylinder deadbolt rated to UL 437 and ANSI/BHMA A156.36 Grade 1. Available in M3 and Bilevel (M4) cylinder technology, it fits doors 1-3/8" to 2-1/2" thick with a standard 2-1/8" crossbore and 1" edge bore (ANSI A115.13). The Captive Key configuration allows thumbturn operation when the space is occupied and converts to a secure double-cylinder mode when not in use. A hardened 1" steel bolt and heavy-gauge tubular steel housing resist crowbar, ice-pick, wrench, picking, drilling, bumping, and kicking attacks.

Key Features

Door Thickness Compatibility: Fits doors 1-3/8" to 2-1/2" thick.
Standard Bore Preparation: Requires a 2-1/8" crossbore and 1" edge bore per ANSI A115.13.
Cylinder Technology: Available in M3 (Medeco 4) and Bilevel (M4) - select at the variant level. Both feature a movable element in the key that prevents unauthorized duplication, including 3D printed copies.
Hardened 1" Steel Bolt and Heavy-Gauge Tubular Steel Housing: Solid brass and steel construction resists crowbar, ice-pick, and wrench attacks.
Captive Key Configuration: Allows thumbturn operation when occupied; converts to a secure double-cylinder deadbolt when not in use.
Advanced Master Keying Support: Compatible with M3, M4, M4 BiLevel, and M4 CLIQ systems, supporting large-scale keying architectures for multi-unit or commercial applications.
Angled Key Cuts: Increase the number of available key combinations for enhanced master keying capabilities.
High-Security Strike Plate with 2" Screws: Anchors to structural framing to resist kick-in attacks.
Steel Shroud and Reinforced Bolt Housing: Protects the bolt from ice pick-style attacks; reinforced bolt housing withstands heavy prying attempts.

Certifications and Compliance

ANSI/BHMA A156.36 Grade 1
UL 437 Listed for Drill and Pick Resistance
BHMA A156.30 Certified for Patented Key Control and Duplication Protection
Heavy Duty Rating

Technical Specifications

Series: Maxum Residential Deadbolt
Cylinder Technology: M3 or Bilevel (M4) - select at variant level
Pinning: 5 or 6-Pin
Keyway: DL Keyway
Certification: UL 437 Listed; ANSI/BHMA A156.36 Grade 1
Bolt: 1" solid hardened-steel bolt in heavy-gauge steel housing
Door Thickness: Fits doors 1-3/8" to 2-1/2" thick
Door Prep: Standard 2-1/8" crossbore, 1" edge bore (ANSI/BHMA A115.13)
Construction: Solid-brass cylinder construction with hardened steel inserts

Typical Applications

Residential Homes and Single-Family Dwellings
Condominiums and Apartment Buildings
Home Offices and Private Studios
Light-Duty Commercial Entrances
Multi-Tenant Residential Properties
Property Management and Rental Units Requiring Key Control
High-Security Retrofit Applications on Standard Door Preparations

Why Medeco?

Medeco Maxum deadbolts combine solid brass and steel construction with patent-pending key control technology that blocks unauthorized duplication, including 3D printed copies. Certified to UL 437, ANSI/BHMA A156.36 Grade 1, and BHMA A156.30, the Maxum is built for professionals and property owners who require proven, certifiable protection against physical and covert attacks.

Manufacturer Resources

Medeco Product Catalog

Product Specs

Product Group:: Mechanical Locks
Series:: Maxum Series
Subcategory:: Deadbolts
Product Subgroup:: Bored Locksets
Product Type:: Deadbolts
Commercial/Residential:: Residential
Lock Function:: Deadbolt
Keyed:: Yes
Grade:: Grade 1
Duty Level:: Heavy Duty
Keyed Function:: Double Cylinder
Tags:: medeco deadbolt, medeco 4 maxum deadbolt, medeco m4 deadbolt, medeco double cylinder deadbolt, medeco captive key deadbolt, medeco maxum 11tr503 19, commercial deadbolts,medeco m4 lock
Product Model:: 11R53
Product Function:: Double Cylinder
Keyway Options:: DL Keyway
Product Category:: Mechanical Locks
Department:: Door Hardware

Medeco 11R536T-26-DLT – Frequently Asked Questions

1) What is a captive key deadbolt and how does the Medeco 11R53 actually work day to day?

Captive key means the inside cylinder takes a key that stays in place and acts as a thumbturn while the space is occupied, so anyone inside can throw or retract the bolt without hunting for a key. Pull the key when you leave and the 11R53 reverts to a true double cylinder deadbolt, keyed both sides. That's the configuration people use next to glass sidelites or a glazed door, where a plain thumbturn can be reached through a broken pane. Understand the trade: with the key out, nobody exits without a key, so check your local egress code before putting it on an occupied dwelling's only exit.

2) What is the difference between Medeco M3 and M4 Bilevel on the 11R53 Maxum, and which should I order?

Both are cylinder platforms you pick at order time on the 11R53. M3 is the Medeco 3 platform; Bilevel is the M4 generation. Both use a movable element in the key that blocks unauthorized duplication, including 3D printed copies, and both use angled key cuts that open up more combinations for master keying. The deciding factor is almost never the lock, it's the system you already run: order the technology that matches the existing keyway and master key system on the property. The Maxum supports M3, M4, M4 BiLevel and M4 CLIQ keying architectures, and it's cut on the DL keyway.

3) I need to key several units alike across a building. What do I have to specify when ordering the Medeco 11R53?

Keying is a required choice on the 11R53: keyed different, keyed alike, or to a specific key code you supply in the key code field. You also pick 5 pin or 6 pin cylinders (6 pin gives you more depth for a large master key system), and the pinning state, either fully pinned, sub assembled, or sub assembled with no slider if your locksmith is finishing the cylinders in house. On top of that, choose the technology (M3 or Bilevel), backset, and finish. If you're standardizing a whole property, order every opening on the same technology, same pin count, and the DL keyway so one system covers them all.

4) What is the difference between the 1-inch faceplate and drive-in latch options on the Medeco Maxum deadbolt?

It's how the bolt assembly sits in the edge bore. The 1" faceplate version has a face that mortises into the door edge and screws off, which is what you want on a door already prepped with a rectangular faceplate mortise. Drive-in has no faceplate at all, it presses straight into the 1" edge bore, so it's the choice on a new or unmortised edge and it's common on metal or fiberglass slabs. Each style comes in both 2-3/8" and 2-3/4" backset, so measure from the door edge to the center of the crossbore before you pick.

5) Will the Medeco 11R53 deadbolt latch into the strike that's already in my frame?

The Maxum throws a 1" solid hardened steel bolt, which is the standard commercial projection, so it will engage a strike prepped for a 1" throw deadbolt. The 11R53 ships with its own high security strike plate using 2" screws that reach past the jamb into the structural framing, and that's the part worth installing. A stock strike anchored only in the jamb is the weak point on a kick-in, and replacing it is what turns the hardened bolt into actual resistance.

6) Is the Medeco 11R53 Maxum actually Grade 1, and is it UL listed for pick and drill resistance?

Yes on both. The 11R53 Maxum is certified to ANSI/BHMA A156.36 Grade 1 and carries a Heavy Duty rating, and it is UL 437 Listed for drill and pick resistance. It also holds BHMA A156.30 certification for patented key control and duplication protection, which is the piece a spec writer usually wants when the requirement is restricted keys, not just a strong bolt. For an institutional or MRO spec calling for high security cylinders, those are the three lines that matter.

7) Do I need a double cylinder deadbolt or a single cylinder with a thumbturn?

Go double cylinder when there's glass within arm's reach of the lock, a sidelite, a glazed panel, a door light, because a thumbturn on the inside can be reached through broken glass. The Medeco 11R53 is the double cylinder Maxum, and its captive key setup softens the usual drawback by letting the inside key work as a turn while the space is occupied. If the door is solid with no glass, a single cylinder is simpler and keeps egress clean; the Medeco 11R63 Maxum is the cylinder by thumbturn version of the same deadbolt, and among other brands the Dexter DB1000 single cylinder is a Grade 1 option fitting 1-3/8" to 1-7/8" doors.

8) Can I retrofit the Medeco 11R53 onto a door that already has a standard deadbolt?

In most cases yes. The 11R53 Maxum uses the standard 2-1/8" crossbore and 1" edge bore per ANSI/BHMA A115.13, which is the same prep the ordinary tubular deadbolt on that door is sitting in. Confirm two things before ordering: the backset (2-3/8" or 2-3/4", measured door edge to crossbore center) and the latch style, faceplate or drive-in, matching what's in the edge. Door thickness anywhere from 1-3/8" to 2-1/2" is covered, so that's rarely the blocker. You'll want to swap the strike too, since the supplied high security strike with 2" screws is doing real work.

9) What double cylinder deadbolt fits a door thicker than 2 inches?

The Medeco 11R53 Maxum covers doors 1-3/8 inch to 2-1/2 inch thick on a standard 2-1/8 inch crossbore and 1 inch edge bore. Among comparable double cylinder deadbolts, the Deltana 7312KA2 is listed for 1-3/8 inch to 2 inch doors, the Dexter DB1000 double cylinder for 1-3/8 inch to 1-7/8 inch, the Dexter DB2000 double cylinder for 1-3/8 inch to 1-3/4 inch, and the Design Hardware D1 for 1-3/4 inch. For thick entry slabs and glass front stiles above 2 inches, the 11R53 is the one in this group whose range reaches them.

10) What is the closest Grade 1 double cylinder deadbolt to the Medeco 11R53 Maxum if a patented high-security keyway is not required?

The Design Hardware D1 Series double cylinder deadbolt is the nearest peer on rating and function: it is a Grade 1 double cylinder deadbolt, rated Extra Heavy Duty, for 1-3/4 inch doors. The Dexter DB1000 double cylinder is also Grade 1 double cylinder and covers 1-3/8 inch to 1-7/8 inch doors. The Medeco 11R53 Maxum is ANSI/BHMA A156.36 Grade 1 double cylinder as well, but carries the DL keyway with M3 or Bilevel technology and UL 437 listing for drill and pick resistance, and fits 1-3/8 inch to 2-1/2 inch doors. Choose the D1 or DB1000 where the keying architecture is conventional and no patented key control is called for.

11) An egress door cannot take a key on the inside. What replaces a Medeco 11R53 double cylinder deadbolt there?

A double cylinder deadbolt keys both faces, so an opening required to release without a key on the inside needs a cylinder by thumbturn or a non-keyed inside. The Accentra D111 is Grade 1 cylinder by thumbturn with a 2-3/8 inch backset for 1-3/8 inch to 1-3/4 inch doors, the Falcon D111 is Grade 1 cylinder by thumbturn with adjustable backset, and the Arrow E60 is a Grade 2 exit deadlock, non-keyed, blank plate by thumbturn for 1-3/8 inch to 1-3/4 inch doors. Confirm the egress requirement for the occupancy before specifying either function.

12) A classroom deadbolt function is called for on the drawing. Does the Medeco 11R53 meet it?

No. The 11R53 Maxum is a double cylinder deadbolt with captive key. A classroom deadbolt keys one side against a blank or fixed inside face. The Falcon D111 is a Grade 1 classroom deadbolt with adjustable backset, the Falcon D211 is the Grade 2 medium duty classroom function with single cylinder operation, the Hager 3118 is a Grade 1 classroom deadbolt with Schlage C keyway and 6-pin cylinder, and the Corbin Russwin DL2211 is a Grade 1 cylindrical deadlock in classroom function, cylinder by blank, for 1-3/4 inch doors.

13) What else could I buy instead of the Medeco Maxum if I don't need a high security restricted key?

The Medeco's premium is the cylinder, UL 437 and patented key control, so if your key system doesn't need that, other Grade 1 double cylinder deadbolts cover the mechanical side. The Design Hardware D1 Series double cylinder is Grade 1 and Extra Heavy Duty for 1-3/4" doors. The Dexter DB1000 double cylinder is Grade 1 and covers 1-3/8" to 1-7/8". Stepping down, the Dexter DB2000 and the Delaney LU Series are Grade 2 double cylinders. What none of those give you is duplication control, anyone can walk a key to a hardware store. If key control is the reason you're buying, the Maxum is the reason.

14) Is the Medeco 11R53 a good choice for apartment or rental units where I need key control?

That's the main reason it gets bought. The Maxum's key has a movable element that blocks unauthorized duplication, so a tenant can't run a copy at a hardware kiosk and keep it after move out, and it's BHMA A156.30 certified for exactly that key control. Angled key cuts expand the combination count, which is what makes a large master key architecture across many units possible on one system, and the lock works within M3, M4, M4 BiLevel and M4 CLIQ systems. Order keyed alike where units share a key, or to a key code to fold openings into a system you already run.

15) Should I order 5 pin or 6 pin cylinders on the Medeco Maxum?

Six pin gives you more differs and more room to build levels into a master key system, so it's the pick for a property with a grand master, sub masters and unit keys. Five pin is fine for a standalone door or a small keyed alike group. Whichever you choose, keep it consistent across the property, since mixing pin counts inside one system complicates the keying. Both come on the DL keyway and in either M3 or Bilevel technology.

16) Can I get the Medeco 11R53 unpinned so my locksmith can key it into our system?

Yes. Beyond fully pinned, the 11R53 is orderable sub assembled, or sub assembled with no slider, so a shop with Medeco factory authorization can pin the cylinders into an existing DL keyway system rather than working around factory keying. That's the route when the property already runs an M3 or M4 architecture and every new lock has to drop into it. If you don't have a keying shop, order it pinned, keyed alike or to your key code instead.

17) What is a lighter duty alternative to the Medeco 11R53 for a rental unit that does not need patented key control?

The Medeco 11R53 Maxum is Grade 1 and Heavy Duty with the DL keyway. For units where a conventional keyway is acceptable, the Delaney LU Series double cylinder is Grade 2, the Hager 3214 double cylinder runs a Schlage C keyway for 1-3/8 inch to 1-3/4 inch doors, and the Callan 210S double cylinder is Grade 3. All three keep the double cylinder function; they differ from the 11R53 in grade and in using standard rather than patented keyways.

18) Which deadbolt should be used instead of the Medeco 11R53 on a mortise-prepped door?

The Medeco 11R53 Maxum is a bored deadbolt requiring a 2-1/8 inch crossbore and 1 inch edge bore per ANSI A115.13, so it does not drop into a mortise pocket. For mortise preparation, the Dormakaba D900 small case mortise deadbolt is cylinder by thumbturn with SC keyways, 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. The Arrow 460 is a mortise lock strike for latchbolt and deadbolt functions on 1-3/4 inch doors, not a lock body.

19) Which comparable deadbolts accept an interchangeable core instead of a fixed Medeco cylinder?

The Medeco 11R53 Maxum takes the DL keyway in M3 or Bilevel technology, in 5 pin or 6 pin, and supports M3, M4, M4 BiLevel and M4 CLIQ master keying. Where a facility standardizes on small format interchangeable core instead, the Arrow E61 is a Grade 2 single cylinder deadlock with SFIC prep less core for 1-3/8 inch to 1-3/4 inch doors, the Deltana CL200LAIC is a Grade 2 single cylinder interchangeable core deadbolt with a 2-3/4 inch backset, and the Delaney LM Series is a Grade 1 single cylinder less core deadbolt in dull chrome. All three are single cylinder rather than double.

20) Which items that come up alongside the Medeco 11R53 are not deadbolt locks at all?

Several parts sit near a deadbolt search without replacing one. The Baldwin Reserve 8BR0618001 is a deadbolt spacer for double cylinder trim, the BEST 8T is a T Series tubular deadbolt tube component, and the Arrow 460 is a mortise lock strike for latchbolt and deadbolt functions with a straight lip for 1-3/4 inch doors. The Medeco 11R53 Maxum is the complete double cylinder deadbolt with a 1 inch hardened steel bolt and high-security strike plate, so none of those three is an alternative to it.

21) Which alternative offers an ADA friendly thumbturn instead of a keyed inside?

The Medeco 11R53 Maxum is keyed on both faces in its double cylinder mode. The Cal-Royal LSD is a Grade 3 single cylinder deadbolt with an ADA ergonomic thumbturn for 1-3/8 inch to 1-3/4 inch doors, which gives an inside turn piece sized for limited grip. The Bravura 310B Elite, 310RC Elite and 310SC Elite are Grade 2 cylinder by thumbturn deadbolts in traditional round, contemporary round and contemporary square trim.

22) What finishes does the Medeco Maxum deadbolt come in to match the rest of my door hardware?

Twelve finishes on the 11R53 Maxum: 605 bright brass, 606 satin brass, 609 antique brass, 610 satin brass blackened, 612 satin bronze, 613 dark bronze oil-rubbed, 619 satin nickel, 622 flat black, 624 dark bronze, 625 bright chrome, 626 satin chrome, and 20 antique nickel. Those are BHMA finish numbers, so if you know the code on the existing levers or entry set, you can match it exactly rather than eyeballing it. 626 satin chrome and 613 oil-rubbed bronze are the two that turn up most on multi-unit properties.

23) What makes the Medeco Maxum bolt harder to force than a standard deadbolt?

Three things stack up on the 11R53. The bolt is 1" of solid hardened steel inside a heavy gauge tubular steel housing, with a steel shroud that stops an ice pick style attack from reaching the bolt and a reinforced housing that takes prying. The cylinder is solid brass with hardened steel inserts and is UL 437 Listed for drill and pick resistance, so it also resists picking and bumping. And the supplied strike plate uses 2" screws into structural framing, which is what stops a kick, since most doors fail at the jamb, not the lock.

24) What replaces a Medeco 11R53 when the door needs keypad or credential entry rather than a key?

The 11R53 Maxum is a keyed mechanical double cylinder deadbolt. For credential entry, 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 programmable remote. These change how the door is credentialed rather than substituting the Medeco key control architecture.

25) What double cylinder deadbolt matches decorative Baldwin or Emtek trim on a residential entry?

The Medeco 11R53 Maxum is offered in twelve finishes including 605 bright brass, 613 dark bronze oil-rubbed, 619 satin nickel and 626 satin chrome, with the emphasis on UL 437 and Grade 1 performance. Where the trim styling drives the selection, the Baldwin Reserve double cylinder is offered in contemporary round and contemporary square, the Baldwin Estates 8011 is a contemporary 1-5/8 inch double cylinder, and the Emtek 8323 Modern Disc is a brass double cylinder deadbolt. Each of those holds the double cylinder function while changing the rose profile and material.

26) Is there an alternative that adds locking points beyond a single bolt?

The Medeco 11R53 Maxum throws a single 1 inch hardened steel bolt into a high-security strike plate anchored with 2 inch screws. The Detex DX Series is a hinge side locking deadbolt with multi-point security, which secures the hinge edge rather than only the lock edge. It is a different prep from the 2-1/8 inch crossbore the 11R53 uses, so it is an alternative approach to the opening rather than a drop-in swap.

How fast can I get the Medeco 11R536T-26-DLT 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 Medeco 11R536T-26-DLT come with a warranty?

Absolutely. The Medeco 11R536T-26-DLT 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 Medeco 11R536T-26-DLT?

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

Why buy the Medeco 11R536T-26-DLT from ZenSupply?

ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.

(786) 855-7489

Medeco 11R53 Maxum M3 Double Cylinder Deadbolt with Captive Key, DL Keyway - UL 437 Listed