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

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.