Medeco 11R50 Maxum Single Cyli...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$296.00
$281.22
Medeco Maxum Residential Single Cylinder Deadbolt, DL Keyway — rear cylinder view showing Medeco ASSA ABLOY branding, keyway, bolt, and strike plate, satin nickel finish

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

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Model: 11R503T-26-DLT
$296.00
$281.22
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$296.00
$281.22
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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 door thickness does the Medeco Maxum residential deadbolt accommodate?
Standard residential door thickness of 1-3/8" to 1-3/4". Verify your door thickness before installation. Consult manufacturer specifications for non-standard applications.
2) Does this deadbolt work with existing door prep?
Uses standard 2-1/8" door hole and 1" cross bore. Compatible with most existing residential deadbolt prep. Check backset measurement - typically 2-3/8" or 2-3/4".
3) How do I determine the correct handing for installation?
Single cylinder deadbolts are reversible during installation. The thumb turn goes on the interior side. Latch bolt can be reversed to accommodate door swing direction.
4) What finish options are available for the Maxum series?
Available in multiple finishes including satin chrome, bright brass, and oil rubbed bronze. Verify specific finish availability for this model. Finishes are designed for residential weather exposure.
5) What security grade does this Medeco deadbolt provide?
Medeco Maxum series typically meets ANSI Grade 2 standards for residential applications. Features hardened steel bolt and anti-drill cylinder protection. Check specific model documentation for grade certification.
6) Can this deadbolt be keyed to match existing Medeco locks?
Yes, can be keyed alike with other Medeco DL keyway locks. Requires professional locksmith service for key matching. Medeco's patented key control system prevents unauthorized duplication.
7) What tools are needed for installation?
Standard hand tools: screwdriver, drill with bits, chisel, and measuring tape. Follow manufacturer's template for strike plate mortising. Installation typically takes 30-45 minutes.
8) How do I adjust the latch bolt if it doesn't align properly?
Check door frame alignment first. Latch bolt can be reversed for door swing direction. Strike plate may need repositioning. Ensure door is properly hung and not sagging.
9) Are replacement parts available for the Maxum series?
Yes, Medeco provides replacement cylinders, thumb turns, and hardware components. Contact authorized Medeco dealers for genuine parts. Maintain warranty coverage with original components.
10) What other Medeco residential models are similar to the Maxum?
Consider Medeco Maxum Residential double cylinder or entrance sets for complete door hardware. Deadbolts from the same series offer consistent keying and finish matching.
11) Will this deadbolt work in extreme weather conditions?
Designed for residential exterior use. Cylinder and finish resist corrosion from weather exposure. In harsh climates, regular lubrication of moving parts extends service life.
12) What are the key dimensions I need to verify before ordering?
Measure door thickness, backset distance, and existing hole diameters. StandardSpec: 2-1/8" bore, 1" cross bore, 2-3/8" or 2-3/4" backset. Verify door weight capacity for proper operation.
How fast can I get the Medeco 11R503T-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 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.
How do I get technical support or installation help for the Medeco 11R503T-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 11R503T-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.

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