Corbin Russwin 487K21 77B1 7-P...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$94.00
$81.02
Image coming soon

Corbin Russwin 487K21 77B1 7-Pin X Class Plug 2" Mortise Cylinder Replacement Part with 77B1 Keyway in Satin Brass

(No reviews yet) Write a Review

Model: 487K21 77B1 626

In Stock (leaves warehouse same day if ordered before 3pm ET)

$94.00
$81.02
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

Corbin Russwin 487K21 77B1 7-Pin X Class Plug 2" Mortise Cylinder Replacement Part with 77B1 Keyway in Satin Brass

The Corbin Russwin 487K21 77B1 is a 7-Pin X Class replacement plug designed for 2" mortise cylinder applications. Featuring the 77B1 keyway and a Satin Brass finish, this commercial-grade cylinder part is engineered to maintain the integrity and security of Corbin Russwin mortise lock systems. Designed specifically as a replacement part for compatible Corbin Russwin cylinder assemblies, this plug delivers reliable performance in demanding commercial environments.

Key Features

  • 2" Mortise Format: Precision-dimensioned at 2" for direct compatibility with standard mortise cylinder housings in commercial door hardware applications.
  • 7-Pin X Class Security: Seven-pin X Class configuration provides enhanced key control and security for commercial lock installations requiring a high level of access management.
  • 77B1 Keyway: Configured with the 77B1 keyway for compatibility with existing Corbin Russwin keying systems, supporting seamless key system integration and master keying.
  • Satin Brass Finish: Satin Brass finish provides a professional appearance and durability suited for commercial door hardware applications.
  • Genuine Corbin Russwin Cylinder Part: Manufactured as an authentic Corbin Russwin cylinder component, ensuring proper fit and function within compatible mortise cylinder assemblies.
  • Commercial-Grade Construction: Engineered for commercial applications where consistent, reliable cylinder performance is required across high-traffic door hardware installations.
  • Drop-In Replacement: Designed as a direct replacement part for compatible Corbin Russwin mortise cylinders, simplifying service and maintenance of existing 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: 487K21 77B1
  • Features: Corbin Russwin Cylinder Parts

Typical Applications

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

Why Corbin Russwin 487K21?

Corbin Russwin cylinder parts are purpose-built for commercial door hardware systems, delivering consistent fit and function within the Corbin Russwin mortise cylinder family. The 487K21 77B1 plug's 7-Pin X Class configuration and 77B1 keyway ensure it integrates seamlessly into existing keying systems, making it a reliable choice for facilities management professionals and locksmiths maintaining commercial lock hardware.

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:
487K21 77B1
Features:
Corbin Russwin Cylinder Parts

Corbin Russwin 487K21 77B1 626 – Frequently Asked Questions

1) Will the 487K21 plug work in my existing Corbin Russwin keying system?
It carries the 77B1 keyway, so it keys into an existing Corbin Russwin 77B1 system, including master keyed setups. If your building is keyed on a different Corbin Russwin section, this plug will not accept your keys, so match the keyway stamp on the cylinders you are servicing before ordering.
2) If the mortise cylinder housing itself is damaged and not just the plug, what complete mortise cylinder can be used instead of the Corbin Russwin 487K21 plug?
The Corbin Russwin 487K21 77B1 is a replacement plug only, supplied for 2 inch mortise cylinder applications with the 77B1 keyway. When the housing is damaged rather than the plug, a complete mortise cylinder is the right part: the Detex MC65 is a mortise cylinder with a Schlage C keyway in a 1-1/8 inch 6-pin configuration, and the Adams Rite 4036 is a Grade 1 five-pin mortise cylinder. Both are complete cylinders rather than plug components, so they replace the housing and plug together and put the opening on their own keyway rather than the Corbin Russwin 77B1 system.
3) Is a BEST interchangeable core an equivalent to the Corbin Russwin 487K21 7-pin plug?
No. The 487K21 77B1 is a 7-pin X Class plug that drops into a compatible Corbin Russwin 2 inch mortise cylinder and keys to the 77B1 keyway. BEST interchangeable cores are a different service model: the 1CDF is a drill resistant patented interchangeable 7-pin core in the 150 series, the 1CB is a Peaks 150 series interchangeable core, and the 1C5 is a standard 5-pin core. Those cores pull and swap from a figure-eight core housing, while the Corbin Russwin part is a plug serviced inside the cylinder body, so the two are not interchangeable in the same hardware.
4) What should I order instead of the Corbin Russwin 487K21 if the device takes a rim cylinder rather than a mortise cylinder?
The 487K21 77B1 is built for 2 inch mortise cylinder applications, so it will not serve a rim-prepped exit device. For rim applications the Schlage 20-021 is a 6-pin rim cylinder with a vertical tailpiece cam supplied with 2 keys, and the 20-022 is the same 6-pin rim cylinder with a horizontal tailpiece cam. If the opening needs a full size interchangeable core instead, the Schlage 20-057 is a 6-pin FSIC rim cylinder with a convertible tailpiece cam, and the 20-057-C is an FSIC core in the C keyway with a 643E Aged Bronze finish. Confirm which cam orientation the exit device chassis requires before ordering.
5) I need a whole mortise cylinder, not a plug. What else does ZenSupply carry?
For a complete mortise cylinder, look at the Detex MC65, a 1-1/8 inch 6-pin mortise cylinder in the Schlage C keyway, or the Adams Rite 4036 five-pin mortise cylinder, a Grade 1 unit listed for doors 1/2 inch thickness minimum. Neither will accept Corbin Russwin 77B1 keys, so they suit a new opening or a rekeyed system rather than matching an existing Corbin Russwin master key.
6) Should I rebuild the cylinder with a plug or switch to interchangeable cores?
Rebuilding with the 487K21 plug keeps the existing Corbin Russwin mortise housings and the 77B1 key system intact, which is the cheaper route when only the plugs are worn or need recombinating. If you would rather be able to swap cores by hand in future without disassembly, move the facility to interchangeable core hardware instead, such as the BEST 1CB 150 Series interchangeable core or the BEST 1CDF drill resistant patented 7-pin core. That is a system change, not a repair, and it means new housings.
7) Will this Corbin Russwin plug fit a rim cylinder or a key-in-knob cylinder?
No. It is dimensioned for 2 inch mortise cylinder housings only. For a rim application use a rim cylinder such as the Schlage 20-021 (vertical tailpiece cam) or 20-022 (horizontal tailpiece cam), both 6-pin. For key-in-knob or lever work, the Kaba Ilco 1599 replacement key-in-knob cylinder covers that format.
8) I need a cylinder for a key-in-lever or key-in-knob lockset, not a mortise cylinder plug. What are the alternatives to the Corbin Russwin 487K21?
The 487K21 77B1 is a plug for 2 inch mortise cylinders and does not fit key-in-knob or key-in-lever chassis. For those, the Kaba Ilco 1539 is a key-in-knob and lever universal cylinder, the 1579 is a knob and lever cylinder made for Sargent locks, and the 1599 is a key-in-knob replacement cylinder. The Falcon A23161-05 G is a key-in-lever cylinder in the RU/T series with a 6-pin G keyway, keyed different with 2 cut keys. Match the cylinder to the lock manufacturer's chassis, since these are brand-specific rather than universal to every lever.
9) Can the Corbin Russwin 487K21 plug be used on a deadbolt or a handleset?
No. The 487K21 77B1 is a 7-pin X Class plug for compatible Corbin Russwin 2 inch mortise cylinders in commercial door hardware. Deadbolt and handleset openings call for cylinders built for that function: the Kaba Ilco 1549 is a key-in-deadbolt cylinder and the Medeco 1075127 is a 5-pin rim type lazy motion single cylinder for handlesets and deadbolts. For residential brand retrofits, the Medeco 1012040 is a 6-pin lazy motion rim cylinder for Kwikset single cylinder deadbolts, the 1065140 is a 5-pin retrofit for Arrow JL interconnected locks and Emtek handleset and deadbolt outside cylinders, and the 1065244 is a 5-pin lazy motion rim type cylinder with an Emtek tailpiece.
10) For an aluminum storefront door with an Adams Rite deadlock, is the Corbin Russwin 487K21 the right cylinder part?
Not on its own. The 487K21 77B1 is a plug component for 2 inch Corbin Russwin mortise cylinders. Adams Rite storefront deadlocks are usually served by a cylinder pull or a dedicated mortise cylinder: the 4024 cylinder pull mounts with a trim plate for MS1847 deadlock and deadlatch systems, the 4025 is a five pin tumbler cylinder pull with through-screws for the MS1847, and the 4026 is a five pin tumbler cylinder pull for the 5017 wood door deadlock and deadlatch. The Adams Rite 4036 is a Grade 1 five-pin mortise cylinder rated for a 1/2 inch minimum door thickness.
11) What finishes does the Corbin Russwin 487K21 77B1 plug come in?
Two: 606 Satin Brass and 626 Satin Chrome. Pick the one that matches the cylinder collar and lock trim already on the door, since the plug face is the visible part once it is installed.
12) Do I get keys with the 487K21 plug?
Treat it as a bare plug for a locksmith to pin and key to your existing 77B1 system. Rim cylinders sold as complete assemblies, like the Schlage 20-021, ship with two keys; a service plug like this one is intended to be combinated to the keys already in the building.
13) If an opening only needs the look of a keyed cylinder without any keying, is there an alternative to the Corbin Russwin 487K21?
Yes. The 487K21 77B1 is a functioning 7-pin X Class plug keyed to the 77B1 keyway, which is more part than a non-keyed opening needs. The BEST 12E series dummy rim cylinder with a 1-5/32 inch diameter fills a cylinder prep without operating, and the Emtek CY4 cylinder is sold as a single piece in the parts range. Choose the dummy only where no key function is required, since it will not integrate with a master key system the way the 77B1 plug does.
14) What is the difference between the Corbin Russwin 487K21 finishes and how does that affect matching other cylinders on the building?
The Corbin Russwin 487K21 77B1 plug is offered in 606 Satin Brass and 626 Satin Chrome, so it can be matched to the brass or chrome trim already on a commercial opening. Among comparable cylinders, the Schlage 20-057-C full size interchangeable core is furnished in 643E Aged Bronze, a darker tone that will not match either of the Corbin Russwin options. If a facility is standardizing appearance across doors, pick the plug finish that matches the existing cylinder collars rather than the lockset alone.
15) Is this Corbin Russwin plug suitable for high-traffic commercial buildings?
Yes, it is a commercial part. Typical service work covers office buildings, schools, healthcare, government facilities, retail, multi-tenant residential and industrial sites where Corbin Russwin mortise cylinders are already in place.
How fast can I get the Corbin Russwin 487K21 77B1 626 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 Corbin Russwin 487K21 77B1 626 come with a warranty?
Absolutely. The Corbin Russwin 487K21 77B1 626 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 Corbin Russwin 487K21 77B1 626?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Corbin Russwin 487K21 77B1 626 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
!