Name: Medeco 11R52 Maxum Double Cylinder Deadbolt, DL Keyway - UL 437 Pick-Proof High-Security
Brand: Medeco
SKU: 11R523T-26-DLT
Price: 312.47 USD
Availability: InStock

Product Overview
FAQs

Medeco 11R52 Maxum Double Cylinder Deadbolt, DL Keyway — UL 437 Certified Pick-Proof High-Security Deadbolt

The Medeco Maxum 11R52 Double Cylinder Deadbolt is a premier high-security deadbolt engineered for residential and multi-unit applications demanding uncompromising protection. UL 437 listed and BHMA Grade 1 certified under ANSI/BHMA A156.36, this pick-proof deadbolt combines hardened steel inserts, rotating pins, and a heavy-gauge tubular steel housing to resist drilling, prying, bumping, and kicking. Designed to fit doors from 1-3/8" to 2-1/2" thick with a standard 2-1/8" crossbore and 1" edge bore (ANSI A115.13), the Maxum double cylinder configuration requires key operation from both sides — ideal for doors with adjacent glass windows or sidelights. Compatible with Medeco M4 and M3 key systems for seamless integration into comprehensive master key infrastructures.

Key Features

Door Thickness Compatibility: Fits doors from 1-3/8" to 2-1/2" thick, accommodating a wide range of residential and light commercial door constructions.
Standard Bore Dimensions: Requires a 2-1/8" crossbore and 1" edge bore per ANSI A115.13 for straightforward installation on pre-bored doors.
UL 437 Listed Pick-Proof Construction: Hardened steel inserts and rotating pins provide certified resistance to picking, drilling, bumping, and covert bypass methods.
Heavy-Gauge Tubular Steel Housing: Robust housing with a hardened 1" steel bolt and steel shroud delivers exceptional resistance to ice pick and crowbar attacks.
Patented Key Control: Special angle-cut keys and restricted blanks are available only through Medeco-authorized service centers, ensuring only authorized individuals can duplicate keys.
Double Cylinder Configuration: Requires key operation from both sides of the door, providing enhanced security for doors with glass windows or sidelights nearby.
M4 and M3 Key System Compatibility: Medeco 4 (M4) cylinders offer patent-protected key control and resistance to 3D key duplication; Medeco M3 compatibility ensures master keying integration with existing high-security infrastructure.
Master Keying Support: Supports large, flexible key systems including M4, M3, BiLevel, and CLIQ for expansive master key system configurations.
Steel Strike Plate with 2" Screws: Anchors deep into structural framing for reinforced door frame security against kick-in attacks.
Optional Captive Thumbturn Version: Available for convertible egress security applications.

Certifications & Compliance

UL 437 Listed — Certified Pick and Drill Resistance
ANSI/BHMA Grade 1 Certified (A156.36)
ANSI A115.13 Bore Specification Compliance

Technical Specifications

Series: Maxum® Residential Deadbolt
Cylinder Technology: Medeco 4 (M4)
Pinning: 5 or 6-Pin
Keyway: DL Keyway
Certification: UL 437 Listed; ANSI/BHMA A156.36 Grade 1 (M4)
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
Warranty: 2-year manufacturer's warranty

Typical Applications

High-Security Residential Entry Doors
Apartments and Multi-Unit Residential Buildings
Properties Requiring Pick-Proof and Bump-Resistant Deadbolt Solutions
Doors with Adjacent Glass Windows or Sidelights Requiring Double Cylinder Security
Sites Needing Key Control Integration with Existing Medeco M3 or M4 Systems
Light Commercial and Mixed-Use Properties
Master Key System Installations Requiring Expanded Key Variation

Why Medeco?

Medeco Maxum deadbolt products deliver professional-grade security through a combination of hardened steel inserts, rotating pins, a heavy-gauge tubular steel housing, and a hardened 1" steel bolt with steel shroud — all certified to UL 437 and BHMA Grade 1 under ANSI/BHMA A156.36. The patented key control system, restricted to Medeco-authorized service centers, ensures that key duplication remains exclusively under the owner's control. Engineered for demanding residential and commercial applications where certified, covert-attack-resistant performance is non-negotiable.

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
Keyed:: Yes
Grade:: Grade 1
Duty Level:: Heavy Duty
Keyed Function:: Double Cylinder
Lock Function:: Deadbolt
Tags:: medeco double cylinder deadbolt, medeco m3 cam lock, pick proof deadbolt
Product Model:: 11R52
Product Function:: Double Cylinder
Keyway Options:: DL Keyway
Product Category:: Mechanical Locks
Department:: Door Hardware

Medeco 11R523T-26-DLT – Frequently Asked Questions

1) Will the Medeco Maxum 11R52 deadbolt fit my door thickness and existing bored holes?

The Maxum 11R52 covers doors from 1-3/8 to 2-1/2 inches thick, which takes it well past the 1-3/4 inch commercial standard and onto thick solid-core and older entry doors. Door prep is the standard 2-1/8 inch crossbore with a 1 inch edge bore per ANSI A115.13, so a door already bored for a common tubular deadbolt takes it without new boring. Backset is your choice at order time: 2-3/8 or 2-3/4 inch, each offered with a 1 inch faceplate or a drive-in latch. Measure from the door edge to the center of the existing crossbore and pick the matching backset.

2) Should I use a double cylinder deadbolt or a single cylinder with a thumbturn on an entry door?

Double cylinder means key on both sides, no thumbturn, and the 11R52 Maxum is that configuration. It's the right call when there's glass in the door or a sidelight beside it, because breaking the glass and reaching through gets an intruder nothing without a key. The trade-off is egress: nobody leaves without a key in hand, which many jurisdictions restrict on dwelling exits and which matters on any door people have to get out of in a hurry. If the door is solid with no adjacent glazing, a cylinder-by-thumbturn deadbolt is the simpler choice. Medeco also offers a captive thumbturn version of the Maxum for convertible egress applications where you need both behaviors.

3) Can the Medeco Maxum 11R52 be keyed into an existing Medeco master key system?

It can, on the DL keyway. The 11R52 is built on Medeco 4 (M4) cylinder technology and is orderable in M3 or BiLevel technology as well, so it drops into an existing M3 or M4 system rather than forcing a separate key. Medeco also supports BiLevel and CLIQ within these systems for larger key infrastructures. Choose 5-pin or 6-pin to match the pinning depth of the system you already run, and specify Keyed Alike, Keyed Different, or a specific key code on the order. For an unpinned lock going to your own locksmith, Sub-Assembled and Sub-Assembled No Slider options are available instead of factory Pinned.

4) Is the Medeco Maxum 11R52 actually bump and pick resistant, or is that marketing?

It carries the certification, not just the claim. The Maxum 11R52 is UL 437 Listed for pick and drill resistance and BHMA Grade 1 certified under ANSI/BHMA A156.36. The mechanism uses hardened steel inserts and rotating pins, which is what defeats bumping, and the cylinder is solid brass with those inserts against drilling. The other half of the security is key control: Medeco's angle-cut keys and restricted blanks are only cut through Medeco-authorized service centers, so a tenant or contractor can't walk into a hardware store and copy the key.

5) How much better is the Medeco Maxum deadbolt than a standard Grade 1 deadbolt for my building?

On strike resistance they're closer than the price gap suggests: the Design Hardware D1 Series and the Dexter DB1000 are both Grade 1 double cylinder deadbolts, and the Delaney LM Series Grade 1 is a single cylinder. What none of those bring is certified covert-attack resistance and key control. The Maxum 11R52 is UL 437 Listed for pick and drill resistance and its keys are restricted to Medeco-authorized service centers. So the question is which attack you're defending against. Kick-in and pry, a conventional Grade 1 handles. Picking, bumping, and unauthorized key duplication by tenants, staff, or former contractors, it does not.

6) What is the closest Grade 1 double cylinder deadbolt to the Medeco Maxum 11R52 if a high-security keyway is not required?

The Design Hardware D1 Series double cylinder deadbolt is a Grade 1 double cylinder deadbolt rated extra heavy duty for 1-3/4 inch doors, and the Dexter DB1000 double cylinder is a Grade 1 double cylinder deadbolt covering doors 1-3/8 inch to 1-7/8 inch thick. Both give the key-both-sides function and the Grade 1 rating that the Maxum 11R52 carries, without a restricted patented keyway. The difference is key control: the 11R52 uses the DL keyway with angle-cut keys and restricted blanks duplicated only through Medeco-authorized service centers, and integrates with M4, M3, BiLevel and CLIQ master key systems. If the reason for the specification is duplication control rather than the bolt itself, the D1 and DB1000 do not replace it.

7) The opening does not have glass beside it and occupants need to exit without a key. What replaces a Medeco Maxum 11R52 double cylinder deadbolt?

Use a cylinder by thumbturn deadbolt instead. The Dexter DB1000 single cylinder is Grade 1 cylinder x thumbturn for doors 1-3/8 inch to 1-7/8 inch, the Falcon D111 is a Grade 1 heavy duty cylinder x thumbturn deadbolt with adjustable backset, and the Delaney LM Series is a Grade 1 single cylinder less core deadbolt. The 11R52 is keyed from both sides, which is specified for doors with adjacent glass or sidelights so the bolt cannot be reached through broken glazing. Where there is no glazing and free egress is wanted, a thumbturn deadbolt of the same grade covers the opening.

8) The doors are 2 inches thick. Which double cylinder deadbolts besides the Medeco Maxum 11R52 will fit?

Door thickness eliminates most of the field. The Maxum 11R52 fits doors 1-3/8 inch to 2-1/2 inch with a standard 2-1/8 inch crossbore and 1 inch edge bore per ANSI A115.13. Among comparable double cylinder bolts, the Deltana 7312KA2 covers 1-3/8 inch to 2 inch, while the Dexter DB1000 double cylinder stops at 1-7/8 inch, the Dexter DB2000 double cylinder at 1-3/4 inch, the Hager 3214 at 1-3/4 inch, and the Design Hardware D1 double cylinder is listed for 1-3/4 inch. On thick or built-up doors above 2 inches the Maxum range is the one that reaches.

9) Which deadbolt handles the same job as a Medeco Maxum 11R52 when the site is standardizing on a Schlage C keyway instead of a restricted keyway?

The Hager 3214 is a double cylinder deadbolt with a Schlage C keyway for doors 1-3/8 inch to 1-3/4 inch and carries a fire rating. The Maxum 11R52 uses the DL keyway with M4 and M3 cylinder technology, which keys into an existing Medeco master key system but will not pin to a Schlage C system. On a property already mastered on Schlage C, the 3214 keeps one key across the fleet; on a property mastered on Medeco, the 11R52 does. The choice follows the existing key system, not the bolt.

10) What do I have to specify when ordering a Medeco 11R52 deadbolt?

Five decisions on the Maxum 11R52. Keying: Keyed Different, Keyed Alike, or Key Code (with the code entered if you're matching an existing system). Backset: 2-3/8 or 2-3/4 inch, each in a 1 inch faceplate or drive-in latch. Cylinder pinning depth: 5 pin or 6 pin. Technology: M3 or BiLevel. Pinning state: factory Pinned, Sub-Assembled, or Sub-Assembled No Slider. Finish is the sixth if the door has to match, with twelve to pick from.

11) What double cylinder deadbolt should I use if I don't need high-security key control?

Several straightforward options, depending on how heavy the opening is. The Design Hardware D1 Series is a Grade 1 double cylinder rated extra heavy duty for 1-3/4 inch doors. The Dexter DB1000 is Grade 1 double cylinder covering 1-3/8 to 1-7/8 inch doors, and the DB2000 is the Grade 2 version for 1-3/8 to 1-3/4 inch. The Hager 3214 is a Grade 2 double cylinder on the Schlage C keyway, useful if the rest of the building is already keyed to SC. The Delaney LU Series is Grade 2 double cylinder in stainless. Any of these gives you the key-both-sides behavior for glazed doors without the Medeco key-control program.

12) Is the Medeco Maxum 11R52 rated for a commercial opening or is it a residential deadbolt?

Medeco catalogs the Maxum as a residential deadbolt and it's classed residential, heavy duty, though it carries BHMA Grade 1 under A156.36 and gets used on light commercial and mixed-use doors, apartments, and multi-unit entries. For a true commercial opening spec'd around a deadlock in a hollow metal door, a cylindrical deadlock like the Corbin Russwin DL3011 (Grade 1, 1-3/4 to 2-1/4 inch doors) or the DL3211 (Grade 1, 1-3/4 inch) is the commercial-line answer. Use the Maxum where key control on a residential-style bored door is the point.

13) Will the Medeco Maxum deadbolt hold up to a kick-in, and does it come with a reinforced strike?

Bolt is a 1 inch solid hardened steel bolt in a heavy-gauge tubular steel housing with a steel shroud, which is what resists ice pick and crowbar work at the bolt itself. A steel strike plate with 2 inch screws is included, and those screws are the part that matters: they reach past the jamb trim into the structural framing, so a kick loads the stud instead of splitting the door stop. Install them into framing, not just the jamb, or the bolt spec is wasted.

14) Can I get the Medeco 11R52 unpinned so my locksmith keys it in-house?

Yes. Beyond factory Pinned, the Maxum 11R52 is orderable Sub-Assembled or Sub-Assembled No Slider, so a locksmith with Medeco pinning capability finishes it to the site's system. That's the route for a security integrator or in-house shop running a restricted M3 or M4 keyway who doesn't want factory pinning in the middle of the job. If you'd rather the factory do it, order Keyed Alike, Keyed Different, or Key Code with the code supplied.

15) Can a Corbin Russwin DL3011 or DL3211 deadlock be used in place of a Medeco Maxum 11R52?

They are built for a different opening. The Corbin Russwin DL3011 is a Grade 1 cylindrical deadlock in a cylinder by blank configuration for doors 1-3/4 inch to 2-1/4 inch, and the DL3211 is the same cylinder by blank arrangement for 1-3/4 inch doors. Cylinder by blank means one keyed side and a blank plate on the other, so there is no operation at all from the inside. The Maxum 11R52 is keyed from both sides. For a stairwell or storage door where the interior side should have no operation, the DL3011 or DL3211 is the right call; for an entry where staff need to lock behind themselves from inside, it is not a substitute.

16) What is the difference between a Medeco Maxum 11R52 and the decorative double cylinder deadbolts from Baldwin and Emtek?

The Baldwin Reserve Contemporary Round and Contemporary Square deadbolts, the Baldwin Estates 8011 Contemporary 1-5/8 inch deadbolt, and the Emtek 8323 Modern Disc brass deadbolt are double cylinder bolts chosen largely for trim style and material. The Maxum 11R52 is selected on certification: UL 437 listing for pick and drill resistance, BHMA Grade 1 under A156.36, a 1 inch hardened steel bolt with steel shroud, and DL keyway blanks restricted to Medeco-authorized service centers. It is offered in twelve finishes including 605 bright brass, 613 dark bronze oil-rubbed, 619 satin nickel and 626 satin chrome, so the appearance side is covered without giving up the certification.

17) Does an electronic deadbolt like the Dormakaba Saffire LX-D or Delaney KP400 do the same thing as a Medeco Maxum 11R52?

They solve credential management, not both-sides key control. 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, and the Delaney KP400 is a Grade 2 electronic deadbolt with programmable remote. Those let a manager add and revoke credentials without rekeying. The Maxum 11R52 is a mechanical Grade 1 UL 437 bolt keyed from both sides, with duplication controlled by restricted DL blanks. Sites with glazing next to the door frequently keep the mechanical double cylinder for that opening and use electronics elsewhere.

18) Is the Accentra D111 or Falcon D111 the same deadbolt as a Medeco Maxum 11R52?

No, despite both being Grade 1. The Accentra D111 is a Grade 1 deadbolt with a 2-3/8 inch backset in a cylinder by thumbturn configuration for doors 1-3/8 inch to 1-3/4 inch, and the Falcon D111 is a Grade 1 heavy duty classroom deadbolt, also cylinder by thumbturn. Both are keyed on one side with a turn on the other. The Maxum 11R52 is keyed on both sides and comes in 2-3/8 inch and 2-3/4 inch backsets in either a 1 inch faceplate or drive-in latch. Ordering a D111 against an 11R52 spec puts a thumbturn on the inside of a door where the specification called for a key.

19) What deadbolt should be used instead of a Medeco Maxum 11R52 on an interchangeable core key system?

For an SFIC program, the Arrow E61 is a Grade 2 single cylinder deadlock supplied with SFIC prep less core for doors 1-3/8 inch to 1-3/4 inch, the Deltana CL200LAIC is a Grade 2 single deadbolt with interchangeable core and a 2-3/4 inch backset, and the Delaney LM Series is a Grade 1 single cylinder less core deadbolt. Those accept the facility's own cores at install. The Maxum 11R52 is a fixed DL keyway cylinder available 5 pin or 6 pin and can be ordered pinned, sub-assembled, or sub-assembled with no slider for a locksmith to pin on site.

20) A Medeco Maxum 11R52 was ordered but the door has no crossbore and cannot be bored. What else works?

Move to a surface or mortise bolt. The Codelocks CL200 is a surface deadbolt with key override, the Codelocks CL2200 is an electronic surface deadbolt in brushed steel, and the Dormakaba D900 is a small case mortise deadbolt in a cylinder by turn arrangement with SC keyways. The Maxum 11R52 needs a standard 2-1/8 inch crossbore and 1 inch edge bore per ANSI A115.13, so it is only an option on a bored or pre-bored door. Surface mounting avoids the bore entirely; the small case mortise requires a mortise pocket instead.

21) The tenant needs to exit without hunting for a key but the door still has glass. What alternatives exist to a Medeco Maxum 11R52?

Two directions. Stay on the Maxum platform and order the captive thumbturn version, which the Maxum line offers for convertible egress security. Or use a separate non-keyed exit device such as the Arrow E60, a Grade 2 exit deadlock with a blank plate on the outside and a thumbturn inside for doors 1-3/8 inch to 1-3/4 inch, paired with keyed hardware elsewhere on the opening. Standard 11R52 double cylinder operation requires a key on both faces, which is what makes it suited to glazed openings and also what slows egress.

22) What finishes does the Medeco Maxum 11R52 deadbolt come in for matching existing door hardware?

Twelve, spanning the common BHMA numbers so a fleet of doors can be matched without changing brands elsewhere: 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, plus a 20 Antique Nickel. The two that turn up most on commercial and multi-family openings are 626 Satin Chrome and 613 Oil-Rubbed Bronze.

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

It's the same bolt with a different edge treatment on the 11R52. The 1 inch faceplate version has a plate that sits in a mortised recess on the door edge, which is what a pre-mortised door already has and what gives a finished look on a wood door. The drive-in version has no faceplate and taps straight into the 1 inch edge bore, no chisel work, which is the faster option on a new bore or a metal-edged door with no mortise. Both are offered at 2-3/8 and 2-3/4 inch backset.

24) Which deadbolt is easier to fit than a Medeco Maxum 11R52 when the backset on site is unknown?

Adjustable backset bolts remove the measurement. The Cal-Royal ED500 is a Grade 3 single cylinder deadbolt with adjustable backset for doors 1-3/8 inch to 1-3/4 inch, the Brinks Raleigh E2401 and Mendocino E2402 are single cylinder deadbolts with a 4 way adjustable backset, and the Falcon D111 is a Grade 1 deadbolt with adjustable backset. The Maxum 11R52 is ordered to a fixed backset, either 2-3/8 inch or 2-3/4 inch, each in a 1 inch faceplate or drive-in latch, so the crossbore centerline has to be confirmed before the order goes in.

25) Does the Baldwin 8BR0618001 deadbolt spacer or the BEST 8T tube work with a Medeco Maxum 11R52?

Neither is a deadbolt you can order in place of one. The Baldwin 8BR0618001 is a deadbolt spacer for a double cylinder application and the BEST 8T is a tubular deadbolt tube component from the T Series, both parts of another manufacturer's assembly rather than complete locks. The Maxum 11R52 ships as a complete double cylinder deadbolt with a 1 inch hardened steel bolt and a steel strike plate with 2 inch screws. Ordering either component against an 11R52 line item leaves the opening without a lock.

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Does the Medeco 11R523T-26-DLT come with a warranty?

Absolutely. The Medeco 11R523T-26-DLT is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.

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Medeco 11R52 Maxum Double Cylinder Deadbolt, DL Keyway - UL 437 Pick-Proof High-Security