Medeco 2020051 6-Pin Key-in-Kn...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$176.00
$148.37
Medeco Medeco 2020051 - 6 Pin Cylinder for Falcon F521 F561 F581 and N Series Knob, Schlage C D Series MED-2020051

Medeco 2020051 6-Pin Key-in-Knob/Lever Retrofit Cylinder for Falcon F521, F561, F581, N Series and Schlage C/D Series

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Model: 2020051T-26-DLT
$176.00
$148.37
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$176.00
$148.37
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Medeco 2020051 6-Pin Key-in-Knob/Lever Retrofit Cylinder for Falcon F521, F561, F581, N Series and Schlage C/D Series

The Medeco 2020051 is a 6-pin Key-in-Knob/Lever retrofit cylinder engineered to replace cylinders in knob-type cylindrical locksets, lever-type cylindrical locksets, padlocks, and bored-type auxiliary deadlatches and deadlocks. Compatible with Falcon F521, F561, F581, and N Series knob locksets as well as Schlage C and D Series hardware, this cylinder is constructed of durable machined brass components and carries ANSI A156.30 Level A and ANSI A156.5 Grade 1 certifications, delivering patent-protected key control and consistent quality for heavy-use commercial applications. Medeco M4 (Medeco 4) Key-in-Knob cylinders are UL437 listed for drill and pick resistance with utility patent-pending key control technology.

Key Features

  • Broad Retrofit Compatibility: Designed to retrofit knob-type cylindrical locksets, lever-type cylindrical locksets, padlocks, and bored-type auxiliary deadlatches and deadlocks — compatible with Falcon F521, F561, F581, N Series, and Schlage C and D Series hardware.
  • 6-Pin Cylinder Configuration: Features a 6-pin tumbler design for enhanced security and key control in commercial-grade applications.
  • UL437 Listed: Medeco M4 Key-in-Knob cylinders are UL437 listed for drill and pick resistance, providing a high level of physical attack protection.
  • Patent-Protected Key Control: Utility patent-pending key control technology restricts unauthorized key duplication, supporting access management in commercial environments.
  • Durable Machined Brass Construction: Cylinders are constructed of durable machined brass components for long-lasting performance in demanding commercial applications.
  • Industry-Leading Retrofit Range: Medeco offers over 100 different cylinder designs and tailpiece configurations, providing the largest retrofit capability in the industry and reducing the need for complete lockset replacements.
  • Multiple 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 A156.30 Level A — Patent-protected key control and physical strength (M4, M3)
  • ANSI A156.5 Grade 1 — Consistent quality for heavy-use applications (M4/M4 BiLevel, M3)
  • UL437 Listed — Drill and pick resistance (Medeco M4 Key-in-Knob cylinders)

Technical Specifications

  • Product Family: Key-in-Knob/Lever Cylinder
  • Pinning: 6-Pin
  • Compatible Hardware: Falcon F521 F561 F581 and N Series Knob, Schlage C D Series
  • Certification: UL 437 Listed; ANSI/BHMA A156.30 (M4); ANSI/BHMA A156.5 Grade 1 (M4)
  • Construction: Durable machined brass components
  • Warranty: 2-year manufacturer's warranty

Typical Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Government and Municipal Buildings
  • Multi-Tenant Residential Properties
  • Industrial and Warehouse Facilities

Why Medeco?

Medeco Key-in-Knob/Lever cylinders are built from durable machined brass components and certified to ANSI A156.30 Level A and ANSI A156.5 Grade 1 standards, ensuring both patent-protected key control and the physical strength required for heavy commercial use. With UL437 listing for drill and pick resistance and compatibility across more than 100 cylinder designs and tailpiece configurations, Medeco delivers professional-grade security and unmatched retrofit flexibility for demanding commercial door hardware applications.

Manufacturer Resources

Medeco Product Catalog

Product Specs

Product Group:
Parts and Accessories
Series:
2020051
Product Subgroup:
Cylinders
Product Type:
Key-in-Knob/Lever Cylinder
Commercial/Residential:
Commercial
Subcategory:
Cylinders
Cylinder Classification:
6Pin
Product Category:
Parts and Accessories
Department:
Door Hardware

Medeco 2020051T-26-DLT – Frequently Asked Questions

1) Will a Medeco 2020051 cylinder fit my Schlage D Series lever locks?
Yes. The Medeco 2020051 is a 6-pin key-in-knob/lever retrofit cylinder built to drop into Schlage C and D Series hardware, along with Falcon F521, F561, F581 and N Series knob locksets. It replaces the factory cylinder in the existing lockset, so you keep the lock body and chassis already on the door and only swap the cylinder.
2) Can I use this Medeco retrofit cylinder in a padlock or a bored deadlatch, or is it only for knobs?
Beyond knob and lever cylindrical locksets, the 2020051 cylinder also retrofits padlocks and bored-type auxiliary deadlatches and deadlocks. That is why it is a common standardization choice: one Medeco keyway can cover the knobs, the levers, the auxiliary deadlocks and the padlocks on a site instead of running separate key systems.
3) What is the difference between the Biaxial and M3 options on the Medeco 2020051?
Those are the two Medeco key technologies the 2020051 is offered in, and they are different keyways with different keys. Order to match the system you already run: if your facility is keyed in Medeco Biaxial, an M3 cylinder will not accept your existing keys, and the reverse is equally true. Pick the technology first, then the finish and pinning.
4) Should I order the Medeco cylinder pinned or sub-assembled?
Three build states are offered: Pinned, Sub-Assembled, and Sub-Assembled No Slider. Pinned means it comes built to a key combination. Sub-assembled is for the locksmith or dealer who pins it in house to an existing masterkey system, and the no-slider version leaves the slider out for shops that set that element themselves. A property manager replacing a cylinder wants pinned; a keying shop usually wants sub-assembled.
5) Is the Medeco 2020051 rated for high security, and does it carry a UL listing?
It is UL437 Listed for drill and pick resistance as a Medeco M4 key-in-knob cylinder, and it carries ANSI A156.30 Level A for patent-protected key control and physical strength plus ANSI A156.5 Grade 1 for heavy-use applications. Those three together are what specifiers on government, healthcare and education work usually ask for on a high security cylinder.
6) Do I have to replace the whole lockset to upgrade to Medeco on my Falcon knobs?
No. The 2020051 is a cylinder-only retrofit, so the Falcon F521, F561, F581 or N Series lockset stays on the door and you change the cylinder. Medeco builds over 100 cylinder designs and tailpiece configurations across the line, which is how the upgrade is usually done without pulling hardware or re-prepping doors.
7) Will this stop tenants from getting copies of the key cut at the hardware store?
That is the point of it. Medeco key control here is patent protected, which restricts unauthorized duplication, so blanks are not available over the counter the way a standard Schlage C key is. Combined with the UL437 drill and pick resistance, it gives a multi-tenant or campus property real control over who holds a working key.
8) What finishes does the Medeco 2020051 come in so I can match my existing knobs?
Thirteen finishes are orderable: 605 Bright Brass, 606 Satin Brass, 609 Antique Brass, 611 Bright Bronze, 612 Satin Bronze, 613 Dark Bronze Oil-Rubbed, 618 Bright Nickel, 619 Satin Nickel, 20 Antique Nickel, 622 Flat Black, 624 Dark Bronze, 625 Bright Chrome, and 626 Satin Chrome. For most commercial openings running satin chrome or satin nickel trim, 626 or 619 is the match.
9) Is the Medeco 2020051 heavy-duty enough for a school or hospital door?
It is built as a commercial cylinder from machined brass components and certified to ANSI A156.5 Grade 1, the heavy-use grade, with ANSI A156.30 Level A for physical strength. Educational facilities, healthcare institutions, government buildings and industrial sites are the stated application set.
10) Does a 6-pin Medeco cylinder work in a master key system?
Yes, the 6-pin configuration is what Medeco uses for commercial key control and masterkeying depth. If you are building or extending a system, order the sub-assembled version and pin it to your existing schedule; if you are replacing one cylinder on an existing Medeco system, order pinned to that system.
How fast can I get the Medeco 2020051T-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 2020051T-26-DLT come with a warranty?
Absolutely. The Medeco 2020051T-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 2020051T-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 2020051T-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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