Name: Medeco 11R50 Maxum Single Cylinder Deadbolt, DL Keyway - Grade 1 High Security
Brand: Medeco
SKU: 11R503T-26-DLT
Price: 207.2 USD
Availability: InStock

Product Overview
FAQs

Medeco 11R50 Maxum Single Cylinder Deadbolt, DL Keyway — Grade 1 High Security Deadbolt Lock

The Medeco Maxum Single Cylinder Deadbolt (Model 11R50, DL Keyway) is a premium high security deadbolt engineered for environments demanding superior protection against forced entry and key-based attacks. Featuring Medeco 4 (M4) locking technology, this heavy duty deadbolt is constructed with a solid 1" hardened steel bolt and heavy-gauge tubular steel housing, and fits doors 1-3/8" to 2-1/2" thick with a standard 2-1/8" crossbore and 1" edge bore (ANSI A115.13 prep). Certified to ANSI/BHMA A156.36 Grade 1 and UL 437 listed for drill and pick resistance, it is the top choice for both residential and light commercial applications.

Key Features

Door Thickness Compatibility: Fits doors 1-3/8" to 2-1/2" thick for broad residential and light commercial installation flexibility.
Solid 1" Hardened Steel Bolt: Constructed with a solid 1" hardened steel bolt and heavy-gauge tubular steel housing for maximum forced-entry resistance.
Steel Shroud Protection: Steel shroud over the bolt resists ice-pick attacks and wrenching for enhanced physical security.
High Security Strike Plate: Includes a high security strike plate with 2" screws that anchors to structural framing for maximum resistance to kick-in attempts.
Medeco 4 (M4) Key Control: Patent-pending cylinder technology prevents unauthorized key duplication, including protection against 3D-printed key blanks, with angled key cuts and fore/aft pin placement to significantly increase key combinations.
Drill & Pick Resistance: Strategically placed hardened steel inserts provide drill protection; M4 cylinder design delivers bump and pick resistance.
Master Keying Capabilities: Compatible with Medeco M4 master key systems, including M4 BiLevel and M4 CLIQ for large, scalable deployments.
Configuration Options: Available as single cylinder, double cylinder, or captive key deadbolt; can be ordered with various Medeco lock cylinder technologies to suit specific security requirements.
Architectural Finish Options: Available in 14 finishes including Bright Brass (05), Satin Brass (06), Antique Brass (09), Satin Brass Blackened (10), Bright Bronze (11), Satin Bronze (12), Oil Rubbed Bronze (13), Bright Nickel (18), Satin Nickel (19), Antique Nickel (20), Black (22), Dark Bronze (24), Bright Chrome (25), and Satin Chrome (26).

Certifications & Compliance

ANSI/BHMA A156.36 Grade 1 Certified
UL 437 Listed for Drill and Pick Resistance
BHMA A156.30 Certified — No Unauthorized Key Duplication

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-End Residential Homes
Apartments and Condominiums
Retail Storefronts
Offices and Professional Suites
Multi-Tenant Residential Properties
Light Commercial Facilities Requiring Grade 1 Security
Anywhere a High Security Deadbolt with Key Control is Required

Why Medeco?

Medeco Maxum deadbolts deliver professional-grade security through a combination of a solid 1" hardened steel bolt, heavy-gauge tubular steel housing, and M4 cylinder technology rated to ANSI/BHMA A156.36 Grade 1 and UL 437 standards. The patent-pending key control system — including protection against 3D-printed key blanks and compatibility with M4 master key systems — makes the Maxum an engineered solution for demanding residential and commercial applications where dependable, certified performance is essential.

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:: Single Cylinder
Lock Function:: Deadbolt
Tags:: medeco deadbolt, medeco maxum, medeco lock cylinder, high security deadbolt, heavy duty deadbolt
Product Model:: 11R50
Product Function:: Cylinder x Thumbturn
Keyway Options:: DL Keyway
Product Category:: Mechanical Locks
Department:: Door Hardware

Medeco 11R503T-26-DLT – Frequently Asked Questions

1) What deadbolt works on a 2-1/4 inch thick door?

The Medeco Maxum 11R50 is the widest range of the bunch, 1-3/8 inch all the way to 2-1/2 inch, so a 2-1/4 inch door is inside it with room left over. Of the alternatives, the Corbin Russwin DL3011 Grade 1 cylindrical deadlock is rated 1-3/4 to 2-1/4 inch, which just reaches. The rest stop short: Deltana 7312KA2 ends at 2 inches, Dexter DB1000 at 1-7/8, and the Accentra D111 and Hager 3215 at 1-3/4. Measure the door before you order, because a bolt short of the thickness will not tail out to the turn.

2) Can the Medeco Maxum 11R50 go into the holes left by my old deadbolt?

If the door was bored for a standard tubular deadbolt, yes. The Maxum 11R50 uses the 2-1/8 inch crossbore and 1 inch edge bore called out in ANSI/BHMA A115.13, which is the same prep the common tubular deadbolts are cut for. Two things to check before you order: measure from the door edge to the center of the crossbore, because the bolt is ordered in either a 2-3/8 inch or a 2-3/4 inch backset, and confirm the door thickness falls in the 1-3/8 to 2-1/2 inch range. Get those two right and it is a straight swap with no new boring.

3) Does the Medeco Maxum deadbolt come in a 2-3/8 inch backset, and what is the drive-in option?

Both backsets are offered, 2-3/8 inch and 2-3/4 inch, and each one comes with a choice of a 1 inch faceplate latch or a drive-in latch. Those two backsets are the only ones used on bored residential and light commercial doors, so measure the old bolt rather than guessing. Pick the 1 inch faceplate when the door edge is already mortised for a faceplate; pick drive-in when the edge is just a round bore with no pocket cut, since the drive-in collar seats in the bore and needs no mortising.

4) Can I order Medeco 11R50 Maxum deadbolts keyed alike across a building?

Keying is a required selection on the Maxum 11R50, and the choices are keyed different, keyed alike, or cut to a key code you supply. Keyed alike puts every unit in the order on one key, which is what you want for a set of units or a run of common doors. Key code is the one to use when you are adding to doors that already run on a Medeco key, since it puts the new bolts on the existing bitting. All of it runs on the DL keyway with either a 5 pin or 6 pin cylinder, and the Maxum works in Medeco master key systems, so a floor or a building can sit under a master while each door keeps its own change key.

5) How do I keep tenants from copying the key to a Medeco Maxum deadbolt?

Key control is the reason this bolt exists. The Maxum 11R50 cylinder is certified to BHMA A156.30 for no unauthorized key duplication, and its patent pending cylinder design uses angled key cuts and fore and aft pin placement, which also blocks 3D printed key blanks. The same cylinder is UL 437 listed for drill and pick resistance, with hardened steel inserts set in the solid brass cylinder body. In practice that means a tenant cannot walk a key into a hardware store and come back with a copy, and the lock is not going to be picked or drilled open in the parking lot either.

6) The door has glass beside the lock and I need the deadbolt keyed on both sides. What replaces the Medeco 11R50 Maxum?

The Medeco 11R50 Maxum is a single cylinder deadbolt, key outside and thumbturn inside, so a glazed opening that calls for a key on both sides needs a double cylinder unit. The Dexter DB1000-DCT is a Grade 1 double cylinder deadbolt for doors 1-3/8 to 1-7/8 inch, the Design Hardware D1 is a Grade 1 extra heavy duty double cylinder deadbolt for 1-3/4 inch doors, and the Hager 3214 is a Grade 2 double cylinder deadbolt for doors 1-3/8 to 1-3/4 inch with a Schlage C keyway. Confirm the local egress code allows a double cylinder on the opening before ordering.

7) The door is 2-1/4 inches thick. Will the Medeco 11R50 Maxum work, or do I need something else?

The Medeco 11R50 Maxum fits doors 1-3/8 to 2-1/2 inch thick, so a 2-1/4 inch door falls inside its range with the standard 2-1/8 inch crossbore and 1 inch edge bore prep. Among the comparable deadbolts, the Corbin Russwin DL3011 is the other one built for thick doors, listing 1-3/4 to 2-1/4 inch, though it is a cylinder x blank deadlock rather than cylinder x thumbturn. The Deltana 7312KA2 lists 1-3/8 to 2 inch and is a Grade 3 double cylinder, and the common Grade 1 tubular deadbolts such as the Dexter DB1000-SCT stop at 1-7/8 inch.

8) Which deadbolts that look like substitutes for the Medeco 11R50 Maxum actually need a different door prep?

The Medeco 11R50 Maxum installs in a standard 2-1/8 inch crossbore with a 1 inch edge bore to ANSI/BHMA A115.13, so any deadbolt requiring a mortise pocket is not a drop-in swap. The Dormakaba D900 is a small case mortise deadbolt, 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 mortise electric deadbolt. The Codelocks CL200 with key override and the Codelocks CL2200 in brushed steel are surface mounted deadbolts rather than bored units.

9) Does the Medeco 11R50 meet a Grade 1 high security spec for a commercial opening?

It is certified to ANSI/BHMA A156.36 Grade 1 and UL 437 listed for drill and pick resistance, with a heavy duty rating. The hardware itself is a solid 1 inch hardened steel bolt in a heavy gauge tubular steel housing, with a steel shroud over the bolt that resists ice pick attack and wrenching. Medeco builds the Maxum as its residential series, and it is specified into retail storefronts, offices and professional suites, and multi tenant residential where a Grade 1 bolt with certified key control is called for.

10) Does the Medeco Maxum deadbolt include a reinforced strike, or do I have to buy one?

A high security strike plate ships with the bolt, and it comes with 2 inch screws so the plate anchors into the framing behind the jamb rather than into the jamb trim alone. That is what stops a kick in, and it is the part most deadbolt failures come down to. The bolt side is covered too: a 1 inch solid hardened steel bolt with a steel shroud over it against ice pick and wrenching attacks. Nothing extra to source beyond the lock itself.

11) Can I get the Medeco Maxum 11R50 sub-assembled so I can pin it in my own shop?

Yes. Pinning is a selection: pinned from the factory, sub-assembled, or sub-assembled with no slider. Sub-assembled is the one to take if you are cutting keys to your own system rather than accepting factory bitting. Cylinder choice is 5 pin or 6 pin, all on the DL keyway, and the technology options are Bilevel and M3. Take the 6 pin where the system needs the extra chamber for master key depth.

12) What other Grade 1 single cylinder deadbolts are there besides the Medeco Maxum?

Several, and they split on what you are buying the bolt for. On fit and grade alone: the Accentra D111 is Grade 1 with a 2-3/8 inch backset for 1-3/8 to 1-3/4 inch doors, the Dexter DB1000 is Grade 1 for 1-3/8 to 1-7/8 inch doors, and the Deltana CL200LM is a Grade 1 single cylinder. The Delaney LM Series ships less core, so you supply the cylinder and it goes onto a key system you already run. What the Maxum 11R50 adds on top of the Grade 1 certification is the UL 437 listing for drill and pick resistance and A156.30 certified key control, which is the reason to pay for it rather than a plain Grade 1 bolt.

13) I need a deadbolt with no thumbturn on the inside. Is the Medeco 11R50 that lock?

No. The 11R50 is cylinder by thumbturn, key outside and a turn inside, so it always gives someone on the inside a way to retract the bolt by hand. For key outside and a blank plate inside, look at the Corbin Russwin DL3011 Grade 1 cylindrical deadlock, cylinder by blank, which fits 1-3/4 to 2-1/4 inch doors. For the opposite arrangement, a thumbturn inside with a blank plate outside and no key at all, the Arrow E60 Grade 2 exit deadlock covers 1-3/8 to 1-3/4 inch doors.

14) Do I need a Medeco Maxum on every door, or is there a cheaper deadbolt for interior and storage doors?

Put the Maxum 11R50 where key control and attack resistance actually matter, the exterior and tenant entry doors, and use a lighter bolt on the rest. Grade 2 options for interior, storage, and back of house doors include the Arrow DBX61 single cylinder, the Cal-Royal CB160 with a tamper resistant cylinder guard, and the Hager 3215, which carries a 1 inch throw for 1-3/8 to 1-3/4 inch doors. What you give up is the Medeco cylinder, so those doors sit outside your restricted key system and their keys can be duplicated.

15) I want Grade 1 but I do not need restricted key control. What deadbolt should I order instead of the Medeco 11R50 Maxum?

The Medeco 11R50 Maxum pairs its Grade 1 rating with an M4 cylinder and patent-protected key control that prevents unauthorized duplication. If the opening only needs the Grade 1 rating, the Dexter DB1000-SCT is a Grade 1 single cylinder deadbolt for doors 1-3/8 to 1-7/8 inch, the Falcon D111 is a Grade 1 heavy duty cylinder x thumbturn deadbolt with an adjustable backset, and the Deltana CL200LM is a Grade 1 single cylinder deadbolt. Each carries a standard cylinder rather than a restricted keyway.

16) What is a lighter duty alternative to the Medeco 11R50 Maxum for interior or low traffic doors?

The Medeco 11R50 Maxum is a Grade 1 heavy duty deadbolt. For openings specified at a lower grade, the Arrow DBX61 and the Dexter DB2000-SCT are Grade 2 single cylinder deadbolts, the latter for doors 1-3/8 to 1-3/4 inch, and the Bravura 310B Elite is a Grade 2 cylinder x thumbturn deadbolt with traditional round trim. At Grade 3, the Cal-Royal ED500 offers an adjustable backset and the Cal-Royal LSD has an ADA ergonomic thumbturn, both for doors 1-3/8 to 1-3/4 inch.

17) The opening needs a thumbturn on the inside and no keyway at all outside. What deadbolt does that instead of the Medeco 11R50 Maxum?

The Medeco 11R50 Maxum is a keyed single cylinder deadbolt, so it always carries a cylinder on the outside face. For a non-keyed opening, the Arrow E60 is a Grade 2 exit deadlock with a blank plate outside and a thumbturn inside, fitting doors 1-3/8 to 1-3/4 inch. The Callan 205S is a Grade 3 one-sided half-bore deadbolt, which preps only one face of the door.

18) Our facility keys everything on small format interchangeable core. What deadbolt takes our own cores in place of the Medeco 11R50 Maxum?

The Medeco 11R50 Maxum ships with a Medeco M4 cylinder in the DL keyway and is ordered pinned or sub-assembled. Where a facility supplies its own SFIC cores, the Arrow E61 26D IC is a Grade 2 single cylinder deadlock prepped for SFIC and supplied less core for doors 1-3/8 to 1-3/4 inch, and the Deltana CL200LAIC is a Grade 2 single cylinder deadbolt with an interchangeable core prep, less cylinder, on a 2-3/4 inch backset. The Delaney LM Series is a Grade 1 single cylinder less core deadbolt in dull chrome US26D.

19) Our buildings are keyed on Schlage C. Which deadbolt matches that system instead of the Medeco 11R50 Maxum?

The Medeco 11R50 Maxum uses the Medeco DL keyway with M4 cylinder technology, which keys into Medeco M4 master key systems including M4 BiLevel and M4 CLIQ. For an opening that has to key into an existing Schlage C system, the Hager 3215 is a single cylinder deadbolt with a 1 inch throw and a Schlage C keyway for doors 1-3/8 to 1-3/4 inch, and the Hager 3115 is a Grade 2 cylinder x thumbturn deadbolt with the same keyway and door range. The Hager 3118 is a Grade 1 classroom deadbolt with a Schlage C keyway and a 6-pin cylinder.

20) I searched Medeco 11R50 alternatives and got a strike, a tube and a spacer. Which of those are complete deadbolts?

None of them. The Medeco 11R50 Maxum is a complete single cylinder deadbolt supplied with a high security strike plate and 2 inch screws. The Arrow 460 is a mortise lock strike with a straight lip for latchbolt and deadbolt functions, the BEST 8T is the tubular deadbolt tube component of the T Series, and the Baldwin Reserve 8BR0618001 is a deadbolt spacer used with a double cylinder deadbolt. Each of those is a component or trim piece ordered alongside a lock, not in place of one.

21) The backset on the existing doors is not consistent. Does the Medeco 11R50 Maxum cover both, or is an adjustable deadbolt the safer order?

The Medeco 11R50 Maxum is ordered by backset, in 2-3/8 inch and 2-3/4 inch, each available with a 1 inch faceplate or as a drive-in, so a mixed set of doors means splitting the order between the two. If a single part number has to cover an unknown backset, the Falcon D111 is a Grade 1 heavy duty cylinder x thumbturn deadbolt with an adjustable backset, the Cal-Royal ED500 is a Grade 3 deadbolt with an adjustable backset for doors 1-3/8 to 1-3/4 inch, and the Brinks E2401 Raleigh and E2402 Mendocino are single cylinder deadbolts with a 4 way adjustable backset in round and square trim.

22) We are moving units to keypad or credential entry. What replaces the Medeco 11R50 Maxum on those doors?

The Medeco 11R50 Maxum is a keyed mechanical deadbolt with an M4 cylinder and thumbturn. For credential based entry, the Delaney KP400 is a Grade 2 electronic deadbolt with a programmable remote, the Dormakaba Saffire LX-D is an RFID electronic deadbolt with BLE and electronic lock override, and the Dormakaba Nova-D is an RFID multihousing smart electronic deadbolt. The Codelocks CL2210 is an electronic mortise deadbolt, which takes a mortise pocket rather than the bored prep the 11R50 Maxum uses.

23) What finishes does the Medeco Maxum deadbolt come in so it matches the rest of my door hardware?

Twelve finishes, covering the usual architectural range: 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 626 satin chrome and 619 satin nickel line up with the lever and closer finishes already on a commercial opening. For a property standardizing across buildings, order the finish code rather than the finish name and the match holds across restock orders.

24) The deadbolt has to match decorative entry trim. How does the Medeco 11R50 Maxum compare to designer deadbolts?

The Medeco 11R50 Maxum comes in 12 architectural finishes including 605 Bright Brass, 613 Dark Bronze Oil-Rubbed, 619 Satin Nickel, 622 Flat Black and 626 Satin Chrome, on a round Maxum escutcheon. Where the trim shape itself has to match, the Baldwin Reserve DC.CRD and DC.CSD are double cylinder contemporary deadbolts in round and square, the Emtek #11 Tuscany is a lost wax cast bronze deadbolt with cylinder x thumbturn, and the Emtek 8323 Modern Disc is a brass double cylinder deadbolt. In single cylinder cylinder x thumbturn, the Bravura 310RC Elite is a Grade 2 contemporary round deadbolt, the 310SC Elite is the square version, and the Bravura Rectangle is a Grade 2 rectangular single cylinder deadbolt.

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Does the Medeco 11R503T-26-DLT come with a warranty?

Absolutely. The Medeco 11R503T-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 11R50 Maxum Single Cylinder Deadbolt, DL Keyway - Grade 1 High Security