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Medeco X4SFIC Small Format Interchangeable Core with KeyMark Key Control, 8E Keyway
The Medeco X4SFIC Small Format Interchangeable Core (SFIC) delivers utility-patented key control in a high-security, easily manageable package engineered for organizations with frequent personnel changes or evolving security needs. Featuring the Medeco KeyMark X4 system, this core enables non-technical personnel to re-key locks instantly using a control key — no disassembly required — eliminating the cost and delay of locksmith services. Built from solid brass with nickel silver bottom pins and spool-shaped top and bottom pins for enhanced pick resistance, the X4SFIC is fully compatible with existing SFIC hardware from other manufacturers, including Schlage, making it an ideal retrofit upgrade where key duplication security is critical.
Key Features
- Solid Brass Construction: Engineered from solid brass for long-term durability and reliable performance in demanding commercial environments.
- Rapid Core Change: Re-key locks instantly using a control key — no need to disassemble the lock — allowing non-technical personnel to manage security changes efficiently.
- Spool-Shaped Top and Bottom Pins: Precision spool-shaped pin design provides enhanced pick resistance for superior high-security performance.
- Nickel Silver Bottom Pins: Nickel silver bottom pins deliver increased wear resistance and extended service lifespan.
- Individual Pin Chamber Caps: Simplifies servicing and reconfiguration, reducing maintenance time and complexity.
- Utility-Patented Key Control: Medeco X4 key blank system offers utility patent protection against unauthorized key duplication, keeping key control with authorized personnel or institutions.
- Flexible Keying Options: Available keyed alike, keyed different, or master keyed to match your specific security structure.
- Broad 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).
- Retrofit Compatibility: Fully compatible with existing SFIC hardware from other manufacturers, including Schlage, for seamless upgrades without replacing existing hardware.
Certifications & Compliance
- Utility Patent Protection on Medeco X4 Key Blank System
- Compatible with Medeco KeyMark® High-Security Ecosystem
Technical Specifications
- Series: Medeco X4 Small Format Interchangeable Core (SFIC)
- Cylinder Technology: Medeco X4
- Keyway: 8E Keyway
- Key Control: Patented protection against unauthorized key duplication through 2030
- Construction: Solid brass construction with spool-shaped top and bottom pins for pick resistance
- Compatibility: Industry-standard SFIC housing
- Warranty: 2-year manufacturer's warranty
Typical Applications
- Fast Food Chains and Quick-Service Restaurants
- Retail and Convenience Stores
- Apartment Complexes and Multi-Unit Residential Properties
- Hospitals and Healthcare Facilities
- Schools and Educational Institutions
- Office Buildings and Commercial Properties
- Retrofit Upgrades for Existing SFIC Systems
Why Medeco?
Medeco X4SFIC cores are built from solid brass with nickel silver bottom pins and spool-shaped pin technology, delivering professional-grade pick resistance and long-term durability for high-traffic commercial applications. The KeyMark X4 system's utility-patented key blank design ensures that key duplication control remains firmly with authorized personnel, making it the trusted choice for institutions and businesses that demand both rapid rekeying capability and strict access management.
Manufacturer Resources
Medeco Product Catalog
Product Specs
- Product Group:
- Parts and Accessories
- Product Subgroup:
- Cylinders
- Product Type:
- SFIC Cylinder
- Subcategory:
- Small Format Interchangeable Core
- Compatibility:
- Schlage
- Commercial/Residential:
- Commercial
- Tags:
- medeco x4, medeco x4 key blank, medeco keymark, medeco keymark x4
- Product Category:
- Parts and Accessories
- Product Substrate:
- Brass
- Department:
- Door Hardware
Medeco 33700006K-26-8ED – Frequently Asked Questions
1) Will a Medeco X4 SFIC core fit my existing Schlage small format interchangeable core locks?
Yes. The Medeco X4SFIC is built to the industry-standard SFIC housing envelope and is listed as compatible with existing SFIC hardware from other manufacturers, Schlage included. That means the core drops into the same lever, knob, mortise housing, padlock or exit device trim you already have, pulled with a control key, so you upgrade key control without buying new lock bodies. It is a core swap, not a hardware replacement.
2) Should I order the 6-pin or 7-pin Medeco X4 SFIC core?
Both pin counts are offered on the X4SFIC, and the choice comes down to the keying system you are joining. If the facility already runs a KeyMark X4 system, match the pin count already in service so the existing keys and masters work. Starting fresh, a 7-pin core gives you more chambers to build a deeper master key hierarchy across a large property; a 6-pin core is the simpler pick for a single building or a small keyed-alike group. Every finish offered is available in both 6 and 7 pins.
3) Can our maintenance staff re-key a Medeco X4 SFIC core themselves without a locksmith?
Changing the core, yes. With a control key, staff pull the X4 core out of the housing and drop a new one in with no disassembly of the lock, so a turnover, a lost key or a terminated employee is handled in seconds by someone who is not a locksmith. What that does not mean is repinning the core itself, or cutting keys: the X4 key blank carries utility patent protection, so blanks and duplicates stay restricted to authorized personnel. Practically, you keep a small stock of pre-keyed cores on hand and rotate them.
4) What makes Medeco KeyMark X4 different from a standard SFIC core we could buy cheaper?
Key control is the difference. A standard SFIC core takes a commodity blank anyone can cut, so a tenant or a subcontractor can walk into a hardware store and duplicate the key. The X4 blank is utility patented, with duplication protection running through 2030, so blanks are restricted to authorized personnel or the institution holding the system. The core itself is also built for attack resistance: spool-shaped top and bottom pins to defeat picking, nickel silver bottom pins for wear, and individual pin chamber caps that make servicing straightforward. If your problem is unauthorized keys rather than worn locks, that is what you are paying for.
5) Will a Medeco X4 SFIC core work with keys from another Medeco or KeyMark system we already have?
Only if that system is on the same keyway. This core is cut for the 8E keyway in the Medeco KeyMark X4 family, and SFIC keyways do not cross over, so an existing Medeco system on a different keyway will not operate it and cannot be master keyed with it. Before ordering for an expansion, check the keyway stamped on your current key or on the system paperwork. If it is not 8E, you are starting a separate system rather than extending the one you have.
6) Can I put an X4 SFIC core in a lock that takes a large format interchangeable core or a standard mortise cylinder?
No. This is a small format core, the figure-eight body, and it only fits housings prepped for SFIC. A large format interchangeable core is a different, larger shape and will not accept it, and a lock built for a conventional mortise or rim cylinder has no core cavity or control key function at all. To move those openings onto an X4 system you need SFIC-prepped housings or SFIC retrofit cylinders for the lock bodies you have, not just the core.
7) We have mixed Schlage and other brand SFIC locks across a property. Can we standardize the whole facility on one Medeco X4 key system?
That is the usual reason to buy these. Because the X4 core is dimensionally an industry-standard SFIC and works in existing SFIC hardware from other manufacturers including Schlage, you can pull the assorted cores across levers, deadbolts, exit device trim and padlock housings and replace them all with 8E keyway X4 cores on a single master keyed hierarchy. Every opening that already has an SFIC housing converts with a core swap. Openings without SFIC prep are the ones needing hardware work, so survey the building for those before you place the order.
8) Can I get Medeco X4 SFIC cores keyed alike across a group of doors, or master keyed for a building?
All three keying arrangements are available on the X4SFIC: keyed alike so one key runs a group of doors, keyed different so each opening has its own key, and master keyed so a building master or grand master sits above individual change keys. For a multi-building or multi-tenant property, specify the pin count, the keying arrangement and where each core sits in the hierarchy when you order, and keep the control key separate from the operating keys.
9) Do I need a control key to install a Medeco X4 SFIC core, and is it included?
A control key is required. It is what retracts the figure-eight core's retaining lug so the core comes out of the housing, and without one you cannot install or remove the core at all. Control keys are part of the keying system, ordered with it, and are not supplied with each individual core. If you are starting a new X4 system, specify the control key on the order; if you are adding cores to a system already in place, the control key you have for that system pulls them.
10) What finishes do Medeco X4 SFIC cores come in, and does the core finish have to match my lever?
Fourteen finishes are offered: 605 Bright Brass, 606 Satin Brass, 609 Antique Brass, 610 Satin Brass Blackened, 611 Bright Bronze, 612 Satin Bronze, 613 Dark Bronze Oil-Rubbed, 618 Bright Nickel, 619 Satin Nickel, 620 Antique Nickel, 622 Flat Black, 624 Dark Bronze, 625 Bright Chrome and 626 Satin Chrome. Only the core face shows once it is installed, so matching it to the surrounding trim matters on visible openings, front entries, tenant doors, anything a customer looks at. On back of house, mechanical rooms and stairwells, buyers commonly standardize on one finish across the whole property to keep stock simple.
11) Is the Medeco X4 SFIC core solid brass, and will it hold up in a high-traffic commercial door?
The core body is solid brass, with nickel silver bottom pins for wear resistance. Nickel silver is harder than the brass pins used in commodity cores, which is what keeps the shear line accurate after tens of thousands of key insertions. That combination is why these get specified for commercial duty: quick-service restaurants, retail, apartment buildings, hospitals, schools and office properties, where the same door gets keyed several times a day.
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Does the Medeco 33700006K-26-8ED come with a warranty?
Absolutely. The Medeco 33700006K-26-8ED is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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