Corbin Russwin 487K21 7-Pin X ...
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Corbin Russwin 487K21 7-Pin X Class Mortise Cylinder Plug with 77B2 Keyway, 2" Satin Brass

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Model: 487K21 77B2 626

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

$94.00
$81.02
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Corbin Russwin 487K21 7-Pin X Class Mortise Cylinder Plug with 77B2 Keyway in Satin Brass

The Corbin Russwin 487K21 is a commercial-grade 7-Pin X Class mortise cylinder plug engineered for reliable, high-security key control in demanding commercial applications. Designed specifically for 2" mortise cylinders, this replacement plug features the 77B2 keyway and is finished in satin brass, making it a precise fit for compatible Corbin Russwin mortise lock configurations. As a genuine Corbin Russwin cylinder part, it provides a trusted replacement solution that maintains the integrity of the original locking system.

Key Features

  • 7-Pin X Class Configuration: Features a 7-pin X Class plug design for enhanced key control and security in commercial mortise cylinder applications.
  • 2" Mortise Cylinder Fit: Precisely sized at 2" for direct compatibility with standard mortise cylinder housings used in commercial door hardware.
  • 77B2 Keyway: Utilizes the 77B2 keyway profile for controlled key duplication and compatibility within Corbin Russwin keying systems.
  • Satin Brass Finish: Finished in satin brass to complement a wide range of commercial door hardware aesthetics and maintain a consistent appearance.
  • Genuine Corbin Russwin Cylinder Part: Manufactured as an authentic Corbin Russwin cylinder component, ensuring proper fit, function, and longevity as a replacement part.
  • Commercial-Grade Replacement: Engineered for commercial use, supporting high-cycle performance expectations in office, institutional, and multi-tenant environments.

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 77B2
  • Features: Corbin Russwin Cylinder Parts

Typical Applications

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

Why Corbin Russwin 487K21?

Corbin Russwin cylinder components are manufactured to exact tolerances, ensuring that replacement parts like the 487K21 plug deliver the same fit and function as the original factory-installed hardware. The 7-pin X Class design and controlled 77B2 keyway provide the security infrastructure that professional installers and facility managers depend on for long-term key control in commercial environments.

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 77B2
Features:
Corbin Russwin Cylinder Parts

Corbin Russwin 487K21 77B2 626 – Frequently Asked Questions

1) Will the 487K21 plug work in a 1-1/8 inch mortise cylinder?
No. The 487K21 plug is sized for 2 inch mortise cylinders. A 1-1/8 inch housing, like the Detex MC65 mortise cylinder, takes a shorter plug and this one will not seat correctly. Match plug length to the housing length you are servicing.
2) Can I key the 487K21 into my existing Corbin Russwin master key system?
Only if your system runs the 77B2 keyway. The 487K21 is cut for 77B2 specifically, so keys from a different Corbin Russwin keyway section will not enter it. It is a 7-pin plug, which is what lets it carry deeper masterkeying levels than a 6-pin cylinder. Confirm the keyway stamp on the cylinders already in your doors before ordering.
3) I need a complete mortise cylinder, not just a plug — what should I order instead of the Corbin Russwin 487K21?
The Corbin Russwin 487K21 is a replacement 7-pin X Class plug for a 2 inch mortise cylinder, so it goes into an existing cylinder shell rather than replacing the whole cylinder. If you need a full mortise cylinder assembly, the Detex MC65 is a 1-1/8 inch 6-pin mortise cylinder with a Schlage C keyway, and the Adams Rite 4036 is a Grade 1 five-pin mortise cylinder. Both are complete cylinders on their own keyways, so they will not key into a Corbin Russwin 77B2 system.
4) Is a BEST interchangeable core the same thing as the Corbin Russwin 487K21 plug?
No. The 487K21 is a 7-pin X Class plug that drops into a 2 inch Corbin Russwin mortise cylinder on the 77B2 keyway. A BEST 1CDF is a drill-resistant patented 7-pin interchangeable core in the 150 series, and the BEST 1C5 is a standard 5-pin core; those cores are pulled and swapped with a control key in BEST-style housings rather than rebuilt as a plug. The pin count may match on the 1CDF, but the core format and keyway system do not interchange with a Corbin Russwin mortise cylinder.
5) My opening uses a rim device, not a mortise lock — what cylinder do I use there?
The Corbin Russwin 487K21 plug is built for 2 inch mortise cylinders and will not serve a rim application. For rim exit devices, the Schlage 20-021 is a 6-pin rim cylinder with a vertical tailpiece cam and the 20-022 is the same 6-pin rim cylinder with a horizontal tailpiece cam, each supplied with 2 keys. If you want a rim cylinder that accepts a full size interchangeable core instead, the Schlage 20-057 is a 6-pin FSIC rim cylinder with a convertible tailpiece cam.
6) Will the Corbin Russwin 487K21 work in an Adams Rite storefront deadlock?
The 487K21 is a plug for a 2 inch Corbin Russwin mortise cylinder, not a cylinder pull or a storefront-specific cylinder. For Adams Rite MS1847 deadlock and deadlatch systems, the 4024 cylinder pull mounts with a trim plate and the 4025 is a five pin tumbler cylinder pull using through-screws; for the 5017 wood door deadlock and deadlatch, the 4026 five pin tumbler cylinder pull applies. The Adams Rite 4036 is a Grade 1 five-pin mortise cylinder with a 1/2 inch minimum door thickness if a mortise cylinder itself is what the deadlock needs.
7) Does the 487K21 plug come with keys?
The 487K21 is a cylinder plug component, not a keyed-and-carded cylinder assembly. If you need a cylinder that arrives with cut keys, look at a complete unit such as the Schlage 20-021 rim cylinder, which is supplied with 2 keys. For the 487K21, plan on having the plug pinned and keys cut to your 77B2 system.
8) I need to standardize key control across a school or hospital. Is a 7-pin plug the right approach or should I use interchangeable cores?
Two different strategies. The 487K21 route keeps conventional mortise cylinders with a restricted 77B2 keyway and 7-pin X Class plugs, which suits a facility already standardized on Corbin Russwin mortise hardware. If you want maintenance staff to swap keying without pulling cylinders, a small-format interchangeable core program is the alternative, for example the BEST 1CDF drill resistant patented 7-pin core in the 150 Series or the Schlage 20-057 FSIC rim cylinder. Both are one-time program decisions, so settle it before you buy cylinders building-wide.
9) What is the difference between the Corbin Russwin 487K21 plug and a key-in-lever cylinder?
The 487K21 is a 7-pin X Class plug for a 2 inch mortise cylinder used in commercial mortise lock systems. A key-in-lever cylinder mounts inside the lever or knob instead: the Falcon A23161-05 G is a 6-pin G keyway key-in-lever cylinder keyed different with 2 cut keys, and the Kaba Ilco 1539 is a universal key-in-knob and lever cylinder. Those are different cylinder formats from a mortise cylinder plug and are not interchangeable with it.
10) I am rekeying Sargent knob and lever locks in the same building — does the 487K21 cover those?
No. The Corbin Russwin 487K21 is a 7-pin X Class mortise cylinder plug on the 77B2 keyway, intended for Corbin Russwin mortise cylinder configurations. For Sargent knob and lever locks, the Kaba Ilco 1579 is a knob and lever cylinder built for Sargent. Use the 487K21 for the mortise cylinders and the Sargent-specific cylinder for the knob and lever openings.
11) I need a cylinder for a deadbolt rather than a mortise lock — what are my options?
The Corbin Russwin 487K21 is a mortise cylinder plug and does not serve deadbolt applications. Kaba Ilco lists the 1549 key-in-deadbolt cylinder and the 1599 key-in-knob replacement cylinder, both with a deadbolt product function. Medeco offers the 1012040, a 6-pin lazy motion rim cylinder for Kwikset single cylinder deadbolts, and the 1075127, a 5-pin rim type lazy motion single cylinder for handlesets and deadbolts.
12) Is there a lower pin count cylinder option if I do not need 7-pin key control?
The Corbin Russwin 487K21 is specifically a 7-pin X Class plug for controlled key duplication on the 77B2 keyway. If a facility does not need that level of key control, lower pin count options in other formats include the BEST 1C5 standard 5-pin cylinder core, the Adams Rite 4036 five-pin mortise cylinder rated Grade 1, and the Detex MC65 6-pin mortise cylinder with a Schlage C keyway. Each of those sits on its own keying system, so they cannot be combined with a 77B2 master key plan.
13) I need a non-keyed filler for an unused cylinder hole — is the 487K21 the right part?
No. The Corbin Russwin 487K21 is a keyed 7-pin X Class plug on the 77B2 keyway, used to restore key function in a 2 inch mortise cylinder. For a hole that needs to be filled without operating a lock, the BEST 12E Series dummy rim cylinder with a 1-5/32 inch diameter is the dummy option in the set.
14) I have Emtek residential hardware in the same building — can I use the 487K21 there too?
No. The Corbin Russwin 487K21 is a commercial 7-pin X Class mortise cylinder plug. For Emtek hardware, the Emtek CY4 cylinder is sold individually, and Medeco offers retrofit options including the 1065140 5-pin cylinder for Arrow JL interconnected locks and Emtek handleset and deadbolt outside cylinders, and the 1065244 5-pin rim lazy motion cylinder supplied with an Emtek tailpiece.
15) If I want to be able to swap cores later without disassembling the cylinder, what should I look at instead of the 487K21?
Rebuilding with a Corbin Russwin 487K21 plug means working inside the 2 inch mortise cylinder on the 77B2 keyway. If you would rather change keying by pulling a core, the BEST 1CB Peaks 150 series interchangeable core and the BEST 1CDF drill-resistant patented 7-pin brass 150 series core are interchangeable core designs, and Schlage's 20-057 is a 6-pin FSIC rim cylinder that accepts a full size interchangeable core. Moving to a core system changes the keyway family, so plan it as a separate key system from the 77B2 openings.
16) Is this plug suitable for a high-traffic commercial building or is it residential grade?
Commercial. Corbin Russwin lists the 487K21 as a commercial-grade part for mortise lock systems in offices, schools, healthcare, government buildings, multi-tenant residential, retail and industrial facilities. It is not a residential retrofit part.
17) What exactly do I order to get this part, and how is it identified?
Order by Corbin Russwin model 487K21 77B2, then pick the finish, 606 satin brass or 626 satin chrome. The 487 designates the plug, the 7-pin X Class configuration and the 77B2 keyway section are what distributors will ask you to confirm.
18) Does the finish choice on the Corbin Russwin 487K21 match cylinders from other brands?
The Corbin Russwin 487K21 plug is offered in 606 satin brass and 626 satin chrome, so you can match either a brass or a chrome trim package. Among other brands in the same cylinder family, the Schlage 20-057-C full size interchangeable core is listed in 643E aged bronze, which is a darker finish and would not blend with a satin brass or satin chrome opening.
How fast can I get the Corbin Russwin 487K21 77B2 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 77B2 626 come with a warranty?
Absolutely. The Corbin Russwin 487K21 77B2 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 77B2 626?
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