Schlage 33-058EF Standard 6-Pin FSIC Cylinder Plug with EF Keyway
The Schlage 33-058EF is a Standard 6-Pin Full Size Interchangeable Core (FSIC) Cylinder Plug designed for use with the EF Keyway. Engineered as a commercial-grade replacement part, this cylinder plug is built to integrate seamlessly into compatible Schlage FSIC lock systems, providing reliable keying performance for institutional and commercial door hardware applications. As an authentic Schlage part, it ensures proper fitment and consistent operation within existing Schlage FSIC installations.
Key Features
- 6-Pin Configuration: Standard 6-pin cylinder plug design delivers enhanced key combination security and reliable operation in commercial FSIC applications.
- FSIC Compatibility: Full Size Interchangeable Core (FSIC) format allows for quick core removal and replacement without specialized tools, streamlining key control management.
- EF Keyway: Configured specifically for the EF keyway, ensuring proper key engagement and compatibility with Schlage EF keyway key blanks and key systems.
- Commercial-Grade Construction: Manufactured to Schlage commercial standards for dependable, long-term performance in high-use institutional and commercial environments.
- Genuine Schlage Part: Authentic Schlage replacement component guarantees proper fit, form, and function within compatible Schlage FSIC lock hardware.
- Replacement Part: Designed as a direct replacement cylinder plug, simplifying maintenance and restoration of existing Schlage FSIC door hardware installations.
Technical Specifications
- Department: Door Hardware
- Product Category: Mechanical Locks
- Product Group: Parts and Accessories
- Subcategory: Parts and Accessories
- Product Subgroup: Parts and Accessories
- Product Type: Cylinder Plug
- Parts and Accessories Type: Replacement Parts
- Commercial/Residential: Commercial
- Product Model: 33-058EF
- Features: Schlage Parts
Typical Applications
- Commercial Office Buildings
- Educational Facilities and Schools
- Healthcare Institutions and Hospitals
- Government and Municipal Buildings
- Industrial and Warehouse Facilities
- Multi-Tenant Residential and Mixed-Use Properties
- Institutional Campus Key Control Systems
Why Schlage 33-058EF?
Schlage FSIC cylinder plug components are engineered to meet the rigorous demands of commercial door hardware, delivering precise fitment and consistent keying performance as genuine manufacturer parts. The 33-058EF is purpose-built for professional key control environments where accurate core interchangeability and EF keyway integrity are essential. Facilities managers and security professionals trust authentic Schlage replacement parts to maintain the performance and reliability of their existing Schlage lock systems.
Manufacturer Resources
Product Specs
- Department:
- Door Hardware
- Product Category:
- Mechanical Locks
- Product Group:
- Parts and Accessories
- Subcategory:
- Parts and Accessories
- Product Subgroup:
- Parts and Accessories
- Product Type:
- Cylinder Plug
- Parts and Accessories Type:
- Replacement Parts
- Commercial/Residential:
- Commercial
- Product Model:
- 33-058EF
- Features:
- Schlage Parts
Schlage 33-058EF 626 – Frequently Asked Questions
1) What exactly is the Schlage 33-058EF, and is it a complete core or just the plug?
It's the cylinder plug only, not a finished core. The 33-058EF is a standard 6-pin plug for Schlage full size interchangeable core (FSIC) cylinders, cut for the EF keyway. A locksmith uses it to rebuild or rekey an FSIC core; you'll still need the core shell, pins, springs and the key blanks in EF to put a working core in the door.
2) Will a 33-058EF plug work in my Schlage SFIC cores?
No. This plug is built for full size interchangeable core (FSIC) cylinders, which is a different format from small format interchangeable core. SFIC housings use a figure-eight core and will not accept an FSIC plug. Confirm your cores are the full size Schlage IC format before ordering.
3) Does the EF keyway matter, or can I use any Schlage key blank?
The keyway matters. The 33-058EF is broached for the EF keyway, so it only accepts EF key blanks and only works inside an EF-based key system. If the rest of your building is keyed in a different Schlage keyway, this plug will not take those keys, and pinning it into an existing masterkey system means that system has to include EF.
4) Is the Corbin Russwin 253K66 rim cylinder plug an alternative to the Schlage 33-058EF FSIC plug?
No - they serve different cylinder formats. The Schlage 33-058EF is a 6-pin Full Size Interchangeable Core plug cut for the Schlage EF keyway, so it belongs in an FSIC core that drops into an FSIC-prepped lock. The Corbin Russwin 253K66 is a 3000 series rim cylinder plug, meaning it goes into a rim cylinder body behind an exit device or rim-cylinder-prepped door, not into an interchangeable core. If your key system is Schlage EF and your openings are FSIC, the 33-058EF is the part that keeps that system intact; the 253K66 would only apply if you are rebuilding a Corbin Russwin rim cylinder.
5) I need a plug for a mortise cylinder, not an interchangeable core - what should I order instead of the Schlage 33-058EF?
For a mortise cylinder rebuild, look at the Corbin Russwin 121K11 series plug-only parts, offered as the 121K11-D2 and the 121K11-L4, which are Grade 1 1000 Series mortise cylinder plugs supplied as the plug alone. The Schlage 33-058EF is built for Full Size Interchangeable Core housings and is keyed to the Schlage EF keyway, so it will not fit a mortise cylinder shell. Match the 121K11 suffix to the keyway your Corbin Russwin system is already keyed to - D2 and L4 are different keyway designations within the same series.
6) What finishes does the Schlage 33-058EF cylinder plug come in?
Two: 606 satin brass and 626 satin chrome. The plug face is the visible part of the core, so pick the one that matches the lock trim on the rest of the opening. 626 satin chrome is the common commercial default and usually what's already in the door on institutional hardware.
7) Is a 6-pin plug what I need, or should I be looking at 7-pin?
The 33-058EF is a standard 6-pin plug. Schlage FSIC cores are built in both 6-pin and 7-pin chambers, and the plug has to match the core and the key bitting depth count you already use. If your existing keys are cut to seven positions, this plug is the wrong part.
8) What are my options if my hardware is Corbin Russwin rather than Schlage?
A Schlage FSIC plug will not go into Corbin Russwin hardware. For Corbin Russwin, the plug-only parts are the 121K11 1000 Series mortise cylinder plug, offered in D2 and L4, and the 253K66 3000 rim cylinder plug. There's also the 219F88-8 cylinder plug retainer if you're rebuilding rather than replacing.
9) Can I use the 33-058EF to replace a mortise or rim cylinder plug?
No. This is an FSIC core plug, a different part from a mortise or rim cylinder plug. Mortise and rim plugs sit inside a threaded mortise cylinder body or a rim cylinder housing; for those you'd look at parts like the Corbin Russwin 121K11 mortise plug or the 253K66 rim plug on their respective hardware. Match the plug to the cylinder format that's actually in the door.
10) What is the difference between the Corbin Russwin 121K11-D2 and the 121K11-L4?
Both are Grade 1 1000 Series mortise cylinder plugs sold as the plug only, so the body style and grade are identical. The difference is the keyway suffix - D2 versus L4 - which determines which key blank and key system the plug will accept. Order the one that matches the keyway already in use on the building's Corbin Russwin cylinders; mixing suffixes within a keyed system will break the master key hierarchy. This is the same principle that governs the Schlage 33-058EF, where the EF suffix fixes it to the Schlage EF keyway.
11) We are standardizing a campus on one key system - does choosing the Schlage 33-058EF lock us out of the Corbin Russwin plugs?
Practically, yes, and that is the point of standardizing. The Schlage 33-058EF is a commercial 6-pin FSIC plug on the Schlage EF keyway, so every opening carrying it keys to the same Schlage EF blank and cores swap between doors without tools. The Corbin Russwin alternatives run on their own keyways and formats - the 121K11-D2 and 121K11-L4 as 1000 Series mortise plugs, the 253K66 as a 3000 rim plug - and will not accept a Schlage EF key. Pick the platform first, then buy plugs only within it.
12) I manage a campus with Schlage key control. Why buy the plug instead of a whole new core?
Rekeying by plug lets you keep the core shells and housings already installed and change only the keying, which is how most institutional key control programs are run. The FSIC design pulls with a control key, so a locksmith can swap cores at the door and rebuild plugs at the bench. Genuine Schlage plugs keep the EF keyway and core tolerances consistent across the campus.
13) Is this a commercial part or is it fine for residential doors?
It's a commercial part. Schlage catalogs the 33-058EF for commercial use, and FSIC keying is used in offices, schools, hospitals, government buildings and multi-tenant properties where key control is managed centrally. Residential entry locks generally use conventional cylinders, not interchangeable cores.
14) Does the finish on the Schlage 33-058EF plug need to match my other hardware the way a cylinder collar does?
The 33-058EF plug face is offered in 606 satin brass and 626 satin chrome, and since the plug face is the part visible at the keyhole, matching it to the surrounding trim keeps the opening looking consistent - 626 satin chrome is the common pairing with brushed chrome and stainless lever trim. The Corbin Russwin comparables are identified by series and keyway rather than a stated finish option, so finish matching is a decision you make on the Schlage side. Functionally the finish does not change keying or fit.
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Does the Schlage 33-058EF 626 come with a warranty?
Absolutely. The Schlage 33-058EF 626 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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