Medeco 2020777 6-Pin Key-in-Kn...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$176.00
$148.37
Medeco Medeco 2020777- 6 Pin Cylinder for Corbin Russwin 6600 Old Series, CK3400 & CK4400 Knob MED-2020777

Medeco 2020777 6-Pin Key-in-Knob Cylinder for Corbin Russwin 6600 Old Series, CK3400 & CK4400

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Model: 2020777T-26-DLT
$176.00
$148.37
Selected Finish is

In Stock (leaves warehouse same day if ordered before 3pm ET)

$176.00
$148.37
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Medeco 2020777 6-Pin Key-in-Knob Cylinder for Corbin Russwin 6600 Old Series, CK3400 & CK4400

The Medeco 2020777 is a 6-pin Key-in-Knob/Lever retrofit cylinder engineered to fit Corbin Russwin 6600 Old Series, CK3400, and CK4400 knob and lever cylindrical locksets. Constructed of durable machined brass components, this cylinder is designed to retrofit knob type cylindrical locksets, lever type cylindrical locksets, padlocks, and bored type auxiliary deadlatches and deadlocks without requiring full lockset replacement. Medeco M4 Key-in-Knob cylinders carry UL437 listing for drill and pick resistance along with utility patent-pending key control, and are certified to ANSI A156.30 Level A and ANSI A156.5 Grade 1 for demanding commercial applications.

Key Features

  • 6-Pin Cylinder Configuration: Features a 6-pin tumbler design for enhanced security and key control in commercial cylindrical locksets.
  • Retrofit Compatibility: Designed specifically to fit Corbin Russwin 6600 Old Series, CK3400, and CK4400 knob and lever locksets, eliminating the need for complete lockset replacement.
  • UL437 Listed: Medeco M4 Key-in-Knob cylinders are UL437 listed for drill and pick resistance, providing a high level of physical security.
  • Patent-Pending Key Control: Utility patent-pending key control technology restricts unauthorized key duplication for superior access management.
  • Durable Machined Brass Construction: Cylinders are constructed of durable machined brass components for long-lasting performance in heavy-use commercial environments.
  • Broad Retrofit Range: Medeco offers over 100 different cylinder designs and tailpiece configurations, supporting the most popular security hardware and minimizing full 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

  • UL437 Listed for Drill and Pick Resistance (Medeco M4)
  • 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)

Technical Specifications

  • Product Family: Key-in-Knob/Lever Cylinder
  • Pinning: 6-Pin
  • Compatible Hardware: Corbin Russwin 6600 Old Series, CK3400 & CK4400 Knob
  • 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
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties

Why Medeco?

Medeco cylinders are engineered from durable machined brass components and certified to ANSI A156.30 Level A and ANSI A156.5 Grade 1, ensuring both physical strength and consistent quality in high-traffic commercial environments. With UL437 listing for drill and pick resistance and patent-pending key control, the Medeco 2020777 delivers professional-grade security for facilities that demand reliable, high-security access management.

Manufacturer Resources

Medeco Product Catalog

Product Specs

Product Group:
Parts and Accessories
Series:
2020777
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 2020777T-26-DLT – Frequently Asked Questions

1) Will the Medeco 2020777 cylinder fit a Corbin Russwin CK4400 lever lockset?
Yes. The Medeco 2020777 is built specifically for Corbin Russwin 6600 Old Series, CK3400, and CK4400 knob and lever cylindrical locksets. It drops into the existing lockset, so you keep the chassis, the trim, and the door prep and only swap the cylinder. Note the 6600 fit is for the Old Series, not the current 6600.
2) Can I rekey existing Corbin Russwin knob locks to Medeco without replacing the whole lockset?
That is exactly what the 2020777 is for. It is a retrofit key-in-knob/lever cylinder that converts a Corbin Russwin 6600 Old Series, CK3400 or CK4400 cylindrical lockset over to a Medeco high security key, with no lockset replacement and no door work. Medeco builds over 100 cylinder and tailpiece configurations across other hardware brands, so a building running mixed hardware can usually be brought onto one Medeco key system the same way.
3) What do I have to specify when ordering the Medeco 2020777 cylinder?
Three things beyond the finish. First, the keyway technology: Biaxial or M3. Second, the pinning state, which is Pinned, Sub-Assembled, or Sub-Assembled No Slider. Third, one of 13 finishes. Sub-assembled options go to a locksmith or end user who will pin the cylinder into an existing Medeco key system; Pinned is the choice if you want it delivered ready to key on your own bitting.
4) What is the difference between the Biaxial and M3 versions of this Medeco cylinder?
They are two different Medeco keying platforms, and the cylinder has to match the key system you already run. If your facility is keyed in Medeco Biaxial, order the Biaxial version; if it is on M3, order M3. Keys are not interchangeable between the two, so this is the one option you cannot get wrong on a retrofit into an existing masterkey system. The ANSI A156.30 Level A key control rating covers M4 and M3.
5) Is the Medeco 2020777 key-in-knob cylinder rated for drill and pick resistance?
Medeco M4 key-in-knob cylinders are UL437 listed for drill and pick resistance and carry utility patent-pending key control against unauthorized duplication. They are certified to ANSI A156.30 Level A for key control and physical strength, and to ANSI A156.5 Grade 1 for heavy-use commercial service. That combination is what a school, hospital or government facility spec usually calls for on exterior and restricted-access openings.
6) Can I get this Medeco retrofit cylinder to match the finish on my existing Corbin Russwin knobs?
Thirteen finishes are offered: Antique Nickel (20), Bright Brass (605), Satin Brass (606), Antique Brass (609), Bright Bronze (611), Satin Bronze (612), Dark Bronze Oil-Rubbed (613), Bright Nickel (618), Satin Nickel (619), Flat Black (622), Dark Bronze (624), Bright Chrome (625), and Satin Chrome (626). For most commercial buildings running Corbin Russwin cylindrical hardware, 626 Satin Chrome or 613 oil-rubbed are the ones that blend in without a visible mismatch at the knob face.
7) Besides knob and lever locks, what else will a Medeco key-in-knob cylinder of this type retrofit?
The key-in-knob/lever cylinder format is used to retrofit knob type cylindrical locksets, lever type cylindrical locksets, padlocks, and bored type auxiliary deadlatches and deadlocks. The 2020777 itself is cut for the Corbin Russwin 6600 Old Series, CK3400 and CK4400 hardware, so for other brands or for mortise and rim applications you want a different Medeco cylinder and tailpiece from the same family.
8) Is this a 5-pin or 6-pin cylinder?
Six pins. The 2020777 is a 6-pin tumbler key-in-knob/lever cylinder, which is what gives it the key differ capacity a large masterkeyed commercial system needs. Bodies are machined brass for heavy-traffic service.
9) Is this Medeco cylinder suitable for residential doors or is it commercial only?
It is classified as commercial hardware, and the ANSI A156.5 Grade 1 certification is aimed at heavy-use openings in offices, schools, healthcare, retail, government buildings, warehouses and multi-tenant residential. It will function on a residential door that already has a Corbin Russwin 6600 Old Series, CK3400 or CK4400 cylindrical lockset, but the pricing and key control model are built around managed commercial key systems.
How fast can I get the Medeco 2020777T-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 2020777T-26-DLT come with a warranty?
Absolutely. The Medeco 2020777T-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 2020777T-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 2020777T-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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