Medeco 310100W Biaxial 31 Series Large Format Interchangeable Core (LFIC) for Yale, G3 Keyway

Medeco Biaxial 31 Series Large Format Interchangeable Core (LFIC) for Yale, G3 Keyway

The Medeco Biaxial 31 Series Large Format Interchangeable Core (LFIC) is a heavy-duty, Grade 1 commercial cylinder engineered to retrofit Yale LFIC mortise housings, rim, key-in-knob, and padlock bodies. Featuring Medeco's Biaxial technology with the G3 keyway, this core allows non-technical personnel to quickly re-key locks using a special control key — no disassembly required. Constructed of durable machined brass components and UL437 listed for drill and pick resistance, the 31 Series delivers professional-grade security for demanding commercial applications.

Key Features

• Tool-Free Core Changeability: Cores can be quickly and easily changed by non-technical personnel using a special control key, effectively re-keying the lock without disassembly — reducing the cost of outside service personnel for routine re-keys.
• 31 Series Control Lug Design: The control/locking lug is positioned at the back of the cylinder, activated by an extra-long key. This eliminates the need for build-up or control pins, simplifying pinning and allowing integration into existing master key systems not originally designed for interchangeable core pinning.
• UL437 Listed: Provides assurance that cylinders meet universal standards for drill and pick resistance and stand up to other types of forced attack.
• Biaxial Technology with G3 Keyway: Medeco Biaxial cylinders offer enhanced key control and security through patented key design, available in the G3 keyway configuration.
• Patented Key Control: Medeco 4 (M4) keys may only be duplicated by Medeco or an authorized Medeco service outlet, and only at the customer's request — providing superior key control.
• Durable Machined Brass Construction: Cylinders are constructed of durable machined brass components, designed to last the life of your equipment in heavy-duty commercial environments.
• Flexible Keying Options: Locks can be keyed alike, keyed different, or master keyed depending on specific security needs.
• Wide Finish Selection: Available in 13 finishes including Bright Brass, Satin Brass, Antique Brass, Bright Bronze, Satin Bronze, Oil Rubbed Bronze, Bright Nickel, Satin Nickel, Antique Nickel, Black, Dark Bronze, Bright Chrome, and Satin Chrome.

Certifications & Compliance

• UL437 Listed — Drill and Pick Resistance
• ANSI/BHMA Grade 1
• Heavy Duty Commercial Rating

Technical Specifications

• Series: 31 Series Large Format Interchangeable Core (LFIC)
• Cylinder Technology: Medeco Biaxial
• Pinning: 6-Pin
• Keyway: G3 Keyway
• Certification: ANSI/BHMA A156.5 Grade 1 rated hardware platform
• Construction: Solid brass construction with nickel-plated pins and hardened stainless-steel drill-resistant pins
• Compatibility: Retrofits into existing LFIC-prepped hardware without replacement
• Warranty: 2-year manufacturer's warranty

Typical Applications

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

Why Medeco?

Medeco 31 Series LFIC cylinders are built from durable machined brass components and carry UL437 listing for drill and pick resistance, delivering the high-security performance that demanding commercial environments require. The Biaxial technology and patented key duplication control ensure that only authorized parties can copy keys, while the tool-free core changeability dramatically simplifies re-keying operations. For facilities that require Grade 1 heavy-duty security with maximum key control, the Medeco 31 Series is a trusted professional-grade solution.