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Schlage B520-483 Throw Member Driver Replacement Part for SFIC Mortise Cylinder
The Schlage B520-483 is a Throw Member (Driver) replacement part engineered specifically for use with Schlage SFIC (Small Format Interchangeable Core) Mortise Cylinders. Designed as a commercial-grade replacement component, this driver ensures continued reliable operation of compatible Schlage mortise cylinder assemblies. As an OEM Schlage part, the B520-483 maintains the precision fit and function required to restore and maintain the performance of SFIC mortise cylinder hardware in demanding commercial environments.
Key Features
- OEM Schlage Replacement Part: Genuine Schlage component engineered to exact manufacturer specifications for reliable fit and function in compatible SFIC mortise cylinder assemblies.
- SFIC Mortise Cylinder Compatibility: Designed specifically for use with Schlage Small Format Interchangeable Core (SFIC) Mortise Cylinders, ensuring proper mechanical engagement and operation.
- Throw Member (Driver) Function: Serves as the drive mechanism within the cylinder assembly, transmitting rotational motion to actuate the locking bolt for dependable locking performance.
- Commercial-Grade Application: Intended for commercial door hardware installations where maintaining cylinder integrity and performance is critical.
- Precision Manufacturing: Produced to Schlage's quality standards as part of their established parts and accessories program, supporting long-term serviceability of installed hardware.
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: Cylinders
- Parts and Accessories Type: Replacement Parts
- Commercial/Residential: Commercial
- Product Model: B520-483
- Features: Schlage Parts
Typical Applications
- Commercial Office Buildings
- Educational Facilities
- Healthcare Institutions
- Government and Municipal Buildings
- Multi-Tenant Residential and Mixed-Use Properties
- Industrial and Warehouse Facilities
- Retail Establishments
Why Schlage B520-483?
Schlage replacement parts like the B520-483 Throw Member Driver are manufactured to the same standards as original hardware, ensuring proper mechanical function when servicing SFIC mortise cylinder assemblies. Engineered for commercial applications, this component supports the long-term serviceability of Schlage cylinder hardware in high-use environments where consistent locking performance is essential.
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:
- Cylinders
- Parts and Accessories Type:
- Replacement Parts
- Commercial/Residential:
- Commercial
- Product Model:
- B520-483
- Features:
- Schlage Parts
Schlage B520-483 – Frequently Asked Questions
1) What exactly is the Schlage B520-483 and what does it do inside a cylinder?
The B520-483 is the throw member, also called the driver, used in Schlage SFIC mortise cylinders. It sits in the cylinder assembly and transmits the turning motion of the core out to the lock, actuating the bolt. It is a service part, not a complete cylinder, so it has no plug, pins or keys of its own.
2) Will the B520-483 driver work in a standard mortise cylinder, or only an SFIC one?
Only SFIC. The B520-483 is built for Schlage Small Format Interchangeable Core mortise cylinder housings. A conventional keyed mortise cylinder uses a cam fixed to its own plug and does not take this driver. If you are working with a conventional housing, you want a complete mortise cylinder with the correct cam instead, such as the Corbin Russwin 1000 Series 1-1/2 inch with an A02 straight cam.
3) I need the interchangeable core itself, not the driver. What should I order?
The B520-483 is the throw member that transmits rotation inside an SFIC mortise cylinder assembly; the keyed core is a separate item. For the core, the BEST 1C series standard 5-pin cylinder core is a small format interchangeable core, and the BEST Peaks 1CB 150 series and BEST 1CDF drill resistant patented 7-pin brass 150 series interchangeable cores are also interchangeable core options.
4) Is the Schlage B520-483 a mortise cylinder, or do I need to order a complete cylinder?
The B520-483 is a throw member (driver) replacement component for Schlage SFIC mortise cylinders, not a complete keyed cylinder. If the job needs a whole mortise cylinder rather than a service part, a complete unit such as the Corbin Russwin CR1000-112 1000 Grade 1 series mortise cylinder, 1-1/2 inch length with an A02 straight cam, or the Detex MC65 mortise cylinder with Schlage C keyway, 1-1/8 inch, 6-pin, covers that.
5) My opening uses a large format interchangeable core mortise lock, not small format. Is the B520-483 the right part?
No. The B520-483 is built for Schlage SFIC (small format interchangeable core) mortise cylinders. For a large format interchangeable core mortise application, the Corbin Russwin CR1080-112-A01 is a 1080 Grade 1 series 1-1/2 inch LFIC mortise cylinder, 6-pin, for Schlage L9000 mortise locks with an A01 cloverleaf cam.
6) I need to order one part number to fix a Schlage SFIC mortise cylinder driver. Is this it?
Yes, order Schlage B520-483. It is sold as a single item under that one model number, with no finish, handing or size options to specify, so there is nothing else to pick on the order.
7) My SFIC core turns but the lock bolt does not move. Does replacing the throw member fix that?
That symptom points at the drive path between the core and the lock, which is exactly what the throw member handles. If the core rotates freely with the key but nothing actuates, a worn or damaged driver is the usual culprit, and the B520-483 restores that connection in a Schlage SFIC mortise cylinder without replacing the whole housing or rekeying the core.
8) If my Schlage SFIC mortise housing itself is damaged, what should I buy instead of just the driver?
A driver alone will not save a cracked or worn housing. In that case you need a complete cylinder. From the interchangeable core side, the BEST 1CB 150 Series interchangeable core or the BEST 1C Series 5-pin core cover the core itself; for a full mortise housing built to take a large format interchangeable core, the Corbin Russwin 1080 Series 1-1/2 inch 6-pin is a mortise cylinder option. Note those LFIC and SFIC formats are not interchangeable with each other, so match the format already in your building.
9) Does the B520-483 work in a rim cylinder?
The B520-483 is specified for SFIC mortise cylinder assemblies, so it is not the part for a rim application. For rim work, the Corbin Russwin 3070-178 is a 3000 series 6-pin rim cylinder housing with a 1-7/8 inch tailpiece, and the BEST 12E series dummy rim cylinder has a 1-5/32 inch diameter.
10) What cam options exist if I am replacing the whole mortise cylinder instead of just the driver?
The B520-483 replaces the drive member inside an existing Schlage SFIC mortise cylinder, so the cam is whatever the assembly already carries. If you swap the complete cylinder, cam style becomes an ordering choice: the Corbin Russwin CR1070-114-A01 is a 1070 Grade 1 series 1-1/4 inch 6-pin mortise housing with an A01 cloverleaf cam, while the CR1000-112 uses an A02 straight cam.
11) I have a key-in-lever or deadbolt cylinder to service, not a mortise cylinder. Is this the part?
No. The B520-483 is a Schlage SFIC mortise cylinder component. For key-in-knob and lever cylinders, the Kaba Ilco 1539 series is a key-in-knob/lever universal cylinder and the 1579 series is a knob and lever cylinder for Sargent; the Falcon A23161-05 G is a key-in-lever cylinder, RU/T series 6-pin G keyway, keyed different with 2 cut keys. For deadbolt cylinders, the Kaba Ilco 1549 series is a key-in-deadbolt cylinder.
12) My opening is an aluminum storefront deadlock. Is the B520-483 usable there?
The B520-483 serves Schlage SFIC mortise cylinder assemblies in commercial door hardware, not storefront deadlock trim. For Adams Rite deadlocks, the 4024 cylinder pull with trim plate mounting and the 4025 five pin tumbler cylinder pull with through-screws are both for the MS1847 deadlock/deadlatch, and the Adams Rite 4036 is a Grade 1 mortise cylinder with five-pin security and a 1/2 inch minimum door thickness.
13) Is the B520-483 a genuine Schlage part or an aftermarket copy?
It is an OEM Schlage component from Schlage's own parts program, so it matches the fit and function of the driver originally installed in the SFIC mortise cylinder assembly.
14) Is this driver suitable for a high traffic commercial building, or is it a residential part?
Commercial. The B520-483 is a commercial-grade component intended for door hardware in offices, schools, hospitals, government buildings, multi-tenant residential and industrial or retail facilities, where the cylinder gets cycled heavily and needs to be serviceable rather than replaced outright.
15) Is the B520-483 appropriate for a residential handleset repair?
The B520-483 is designated commercial and is built for Schlage SFIC mortise cylinders. Residential handleset and deadbolt retrofits are served by other cylinders, such as the Medeco 1075127 5-pin rim type lazy motion single cylinder for handlesets and deadbolts, the Medeco 1012040 6-pin lazy motion rim cylinder for Kwikset single cylinder deadbolts, and the Medeco 1065244 5-pin rim lazy motion cylinder with Emtek tailpiece.
16) Can I substitute an Emtek or Medeco retrofit cylinder for the B520-483 driver?
They are not interchangeable. The B520-483 is an internal throw member for Schlage SFIC mortise cylinders, while the Emtek CY4 cylinder and the Medeco 1065140 5-pin retrofit cylinder for Arrow JL interconnected locks and Emtek handleset and deadbolt outside cylinders are complete cylinders for their own host hardware.
How fast can I get the Schlage B520-483 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 Schlage B520-483 come with a warranty?
Absolutely. The Schlage B520-483 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 Schlage B520-483?
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