Medeco 200503 6-Pin Key-in-Kno...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$176.00
$148.49
Medeco Medeco 200503 - 6 Pin Cylinder for Yale 5300LN 5400LN 4300 Series Knobs MED-200503

Medeco 200503 6-Pin Key-in-Knob Cylinder for Yale 5300LN, 5400LN & 4300 Series Knobs

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Model: 200503T-26-DLT
$176.00
$148.49
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$176.00
$148.49
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Medeco 200503 6-Pin Key-in-Knob Cylinder for Yale 5300LN, 5400LN & 4300 Series Knobs

The Medeco 200503 is a 6-pin Key-in-Knob/Lever retrofit cylinder engineered to replace cylinders in Yale 5300LN, 5400LN, and 4300 Series knob-type and lever-type cylindrical locksets, as well as padlocks and bored-type auxiliary deadlatches and deadlocks. Constructed of durable machined brass components, this Medeco M4 cylinder delivers UL437-listed drill and pick resistance along with utility patent-pending key control, making it a high-security upgrade for commercial door hardware. Certified to ANSI A156.30 Level A for patent-protected key control and physical strength, and ANSI A156.5 Grade 1 for consistent quality in heavy-use applications, the 200503 is a trusted solution for facilities requiring superior access control.

Key Features

  • High-Security 6-Pin Configuration: Six-pin cylinder design provides enhanced pick resistance and key control for demanding commercial security applications.
  • UL437 Listed: Medeco M4 Key-in-Knob cylinders are UL437 listed for drill and pick resistance, delivering verified high-security performance.
  • Patent-Pending Key Control: Utility patent-pending key control technology restricts unauthorized key duplication, protecting access integrity over the life of the installation.
  • Machined Brass Construction: Cylinders are constructed of durable machined brass components for long-lasting reliability in high-traffic commercial environments.
  • Broad Retrofit Compatibility: Designed to retrofit Yale 5300LN, 5400LN, and 4300 Series knob and lever cylindrical locksets, padlocks, and bored-type auxiliary deadlatches and deadlocks — reducing the need for full lockset replacement.
  • Wide Finish Selection: 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).
  • Industry-Leading Retrofit Range: Medeco offers over 100 different cylinder designs and tailpiece configurations, providing the largest retrofit capability in the industry and minimizing full lockset replacements.

Certifications & Compliance

  • UL437 Listed — 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: Yale 5300LN 5400LN 4300 Series Knobs
  • 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
  • Government and Municipal Buildings
  • Retail Establishments
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential and Mixed-Use Properties

Why Medeco?

Medeco Key-in-Knob cylinders are built from durable machined brass components and certified to both ANSI A156.30 Level A and ANSI A156.5 Grade 1, ensuring patent-protected key control and consistent performance under heavy commercial use. With UL437 listing for drill and pick resistance and over 100 retrofit configurations available, the Medeco 200503 delivers professional-grade security and unmatched installation flexibility for facilities that cannot compromise on access control.

Manufacturer Resources

Medeco Product Catalog

Product Specs

Product Group:
Parts and Accessories
Series:
200503
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 200503T-26-DLT – Frequently Asked Questions

1) Will the Medeco 200503 cylinder fit my Yale 5300LN lever locksets?
Yes. The Medeco 200503 is a Key-in-Knob/Lever retrofit cylinder built to replace the factory cylinder in Yale 5300LN, 5400LN and 4300 Series cylindrical locksets, in both knob and lever trim. You keep the existing lockset and chassis and swap only the cylinder, so a building already standardized on Yale cylindrical hardware can be upgraded opening by opening without changing the door prep.
2) Can a Medeco key-in-knob cylinder be used in padlocks or a bored deadlatch, not just a knob lockset?
The 200503 also fits padlocks and bored-type auxiliary deadlatches and deadlocks, on top of the Yale cylindrical locksets it is made for. That matters if you are putting one key system across a facility: the same Medeco keyway can carry the office doors, the gate padlocks and the auxiliary deadbolts instead of leaving a second key on the ring.
3) What is the difference between the M3 and Biaxial versions of the Medeco 200503?
Both are keyway and technology choices on the same 200503 cylinder body, and the 200503 is ordered as either Biaxial or M3. The decision is almost always made for you by the system already in the building: order the one that matches the keyway your existing Medeco keys are cut on, because a Biaxial key will not operate an M3 cylinder. If there is no Medeco system in place yet, the choice sets the platform every future cylinder in that facility has to match.
4) Should I order the Medeco 200503 pinned or sub-assembled?
Three pinning states are offered: Pinned, Sub-Assembled, and Sub-Assembled No Slider. Pinned means the cylinder arrives keyed and ready to install, which is what a property manager or maintenance crew wants. Sub-Assembled ships unpinned for a locksmith or an authorized dealer to key into an existing master system on the bench. Sub-Assembled No Slider omits the slider component as well, for shops pinning to their own configuration. If nobody on your side pins Medeco cylinders, order Pinned.
5) Is the Medeco 200503 cylinder UL437 listed for drill and pick resistance?
Yes. The Medeco M4 key-in-knob cylinder used in the 200503 carries a UL437 listing for drill and pick resistance. It is also certified to ANSI A156.30 Level A for patent-protected key control and physical strength, and to ANSI A156.5 Grade 1 for heavy-use applications. Those three together are usually what a government, healthcare or school specification is asking for when it calls out a high-security cylinder.
6) Can tenants get Medeco 200503 keys copied at a hardware store?
No, and that is the point of the cylinder. The 200503 uses Medeco utility patent-pending key control, which restricts unauthorized duplication, and it is certified to ANSI A156.30 Level A for patent-protected key control. Keys are cut through authorized channels only, so a departing tenant or contractor cannot quietly walk off with a copy of a master.
7) Do I have to replace the whole Yale lockset to upgrade to Medeco high security?
No. Replacing just the cylinder is the whole reason the 200503 exists. Medeco publishes over 100 cylinder and tailpiece configurations for this purpose, and the 200503 covers the Yale 5300LN, 5400LN and 4300 Series. On a retrofit across dozens of openings that is the difference between a cylinder swap per door and tearing out and re-prepping every lockset.
8) Is the Medeco 200503 a 5-pin or 6-pin cylinder?
Six pins. The 200503 is a 6-pin key-in-knob cylinder, which gives more chambers for master keying depth and more pick resistance than a 5-pin. For a facility running a master key system across several tenant floors, the extra chamber is what keeps the system expandable without collisions.
9) What finish do I order to match the Yale knobs already on my doors?
Thirteen finishes are stocked on the 200503: 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). Match the BHMA number on your existing trim, since only the cylinder face shows once installed. The two most common commercial pairings are 626 satin chrome and 613 oil-rubbed bronze.
10) Is the Medeco 200503 cylinder rated for commercial traffic or is it a residential part?
Commercial. The 200503 is a commercial-duty cylinder built from machined brass components and certified to ANSI A156.5 Grade 1, the heavy-use tier. It is specified in office buildings, schools, hospitals, municipal buildings, retail, warehouses and multi-tenant residential, where a knob cylinder is cycled all day and key control has to hold up for the life of the installation.
How fast can I get the Medeco 200503T-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 200503T-26-DLT come with a warranty?
Absolutely. The Medeco 200503T-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 200503T-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 200503T-26-DLT from ZenSupply?
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