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

Corbin Russwin 487K21 7-Pin X Class Mortise Cylinder Plug, 2" Mortise, 77A2 Keyway, Satin Brass

(No reviews yet) Write a Review

Model: 487K21 77A2 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 7-Pin X Class Mortise Cylinder Plug, 2" Mortise, 77A2 Keyway, Satin Brass

The Corbin Russwin 487K21 is a 7-Pin X Class replacement plug designed for 2" mortise cylinder applications. Featuring the 77A2 keyway and a Satin Brass finish, this commercial-grade cylinder plug is engineered to integrate seamlessly with compatible Corbin Russwin mortise lock hardware. Precision-manufactured as part of the Corbin Russwin cylinder parts program, this plug delivers reliable keying performance for demanding commercial environments where security and durability are paramount.

Key Features

  • 7-Pin X Class Configuration: Seven-pin X Class plug design provides enhanced key control and security for commercial mortise cylinder applications.
  • 2" Mortise Format: Sized specifically for 2" mortise cylinders, ensuring precise fit and proper operation within compatible Corbin Russwin mortise lock bodies.
  • 77A2 Keyway: Proprietary 77A2 keyway offers controlled key duplication and compatibility with the Corbin Russwin keying system.
  • Satin Brass Finish: Satin Brass finish delivers a professional aesthetic suitable for commercial interior applications and coordinates with standard architectural hardware finishes.
  • Genuine Corbin Russwin Cylinder Part: Manufactured as an authentic Corbin Russwin cylinder component, ensuring proper fit, function, and compatibility with original equipment.
  • Commercial-Grade Construction: Engineered for commercial use, this replacement plug meets the performance expectations of high-traffic institutional and commercial 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: Cylinders
  • Parts and Accessories Type: Replacement Parts
  • Commercial/Residential: Commercial
  • Product Model: 487K21 77A2
  • 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 parts are manufactured to exacting standards, ensuring genuine compatibility and reliable performance in commercial mortise lock applications. The 487K21 7-Pin X Class plug with 77A2 keyway represents a precision-engineered replacement component backed by Corbin Russwin's legacy of quality in commercial door hardware, making it the trusted choice for facility managers and locksmiths maintaining institutional-grade security 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:
Cylinders
Parts and Accessories Type:
Replacement Parts
Commercial/Residential:
Commercial
Product Model:
487K21 77A2
Features:
Corbin Russwin Cylinder Parts

Corbin Russwin 487K21 77A2 626 – Frequently Asked Questions

1) Is the Corbin Russwin 487K21 a complete mortise cylinder or just the plug?
It is the plug only, not a complete cylinder. The 487K21 is a 7-pin X Class replacement plug sized for 2 inch mortise cylinders in the 77A2 keyway. If you need a whole cylinder to drop into a mortise lock body, this is the wrong line item, order a complete mortise cylinder instead.
2) Will a 77A2 keyway plug work in my existing Corbin Russwin master key system?
The 77A2 keyway is a proprietary Corbin Russwin keyway, so the plug keys into a system already built on 77A2 and nothing else. If the doors in your building are pinned on a different Corbin Russwin keyway, a 77A2 plug will not accept those keys, so match the keyway stamped on your existing cylinders before you order.
3) If the whole mortise cylinder needs replacing instead of just the plug, what should be used?
The Corbin Russwin 487K21 is a replacement plug for 2 inch mortise cylinders, so it only helps when the cylinder housing itself is sound and the keyed plug is being rekeyed or swapped. When the complete cylinder is being replaced, a full mortise cylinder is the item to order - the Detex MC65 is a 1-1/8 inch 6-pin mortise cylinder cut to the Schlage C keyway, and the Adams Rite 4036 is a five-pin mortise cylinder in the 4036 Series rated Grade 1. Both are complete cylinders rather than plugs, and neither uses the Corbin Russwin 77A2 keyway, so they start a separate key system rather than joining an existing Corbin Russwin one.
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 goes inside a 2 inch Corbin Russwin mortise cylinder shell and is keyed to the 77A2 keyway. BEST interchangeable cores are removable figure-eight cores for a BEST housing - the 1CB is a 1CB Series 150 Series interchangeable core, the 1CDF is a drill resistant patented 7-pin brass core in the 1CDF Series, and the 1C5 is a standard 5-pin core. A facility running BEST small format cores pulls and replaces the core with a control key; a Corbin Russwin mortise cylinder is serviced at the plug, which is what the 487K21 is.
5) What finishes does the Corbin Russwin 487K21 plug come in?
Two finishes: 606 Satin Brass and 626 Satin Chrome. Pick the one that matches the cylinder ring and trim already on the door, since the plug face is the visible part once it is installed.
6) Can I use the 487K21 plug to rekey a rim cylinder or a key-in-lever cylinder?
No. It is built for 2 inch mortise cylinder bodies only. Rim cylinders take a different plug and tailpiece arrangement, for example the Schlage 20-021 and 20-022 rim cylinders with vertical and horizontal tailpiece cams, and key-in-lever work uses its own cylinder such as the Kaba Ilco 1539 universal knob and lever cylinder.
7) If I am standardizing a building on interchangeable cores instead, what should I look at?
A plug like the 487K21 is pinned into a fixed cylinder, so every rekey means pulling the cylinder apart. If you would rather swap cores at the door, ZenSupply carries BEST interchangeable core options: the 1C Series standard 5-pin core, the 1CB 150 Series Peaks core, and the 1CDF drill-resistant patented 7-pin brass core. Schlage full-size interchangeable core is also an option with the 20-057 FSIC cylinder.
8) Will the 487K21 plug work in a rim cylinder application?
No - the 487K21 is sized for 2 inch mortise cylinders, which thread into a mortise lock body. Rim cylinders mount through the door and drive an exit device or rim latch with a tailpiece, and they are ordered as complete units: the Schlage 20-021 is a 6-pin rim cylinder with a vertical tailpiece cam, the 20-022 is the same 6-pin rim cylinder with a horizontal tailpiece cam, and the BEST 12E Series dummy rim cylinder is a 1-5/32 inch diameter non-keyed filler. Choose by the cam orientation the exit device requires.
9) What is the equivalent part for a key-in-lever or key-in-knob cylinder rather than a mortise cylinder?
The Corbin Russwin 487K21 serves 2 inch mortise cylinders only. For keyed lever and knob locks the corresponding part is a key-in-lever cylinder: the Falcon A23161-05 G is a 6-pin RU/T Series key-in-lever cylinder in the G keyway supplied keyed different with two cut keys, and Kaba Ilco offers universal replacements including the 1539 Series key-in-knob and lever cylinder, the 1579 Series knob and lever cylinder for Sargent, and the 1599 key-in-knob replacement cylinder. Match the replacement to the lock chassis, not to the mortise cylinder thread.
10) What is the right part for a deadbolt cylinder instead of the 487K21?
The 487K21 is a mortise cylinder plug for commercial mortise lock hardware and does not serve deadbolts. For deadbolt cylinders, Kaba Ilco lists the 1549 Series key-in-deadbolt cylinder, and Medeco offers retrofit options: the 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 1075127 is a 5-pin rim type lazy motion single cylinder for handlesets and deadbolts. Select by the deadbolt brand and the tailpiece it expects.
11) Does the 487K21 fit an Adams Rite MS1847 narrow stile deadlock?
No. The 487K21 is a 7-Pin X Class plug for 2 inch Corbin Russwin mortise cylinders. Adams Rite narrow stile deadlocks take purpose-built cylinder pulls: the 4024 cylinder pull mounts with a trim plate and the 4025 five pin tumbler cylinder pull uses through-screws, both for the MS1847 deadlock/deadlatch, while the 4026 five pin tumbler cylinder pull is for the 5017 wood door deadlock/deadlatch. Those are aluminum and glass front door applications rather than commercial mortise lock bodies.
12) For a facility that wants keys removable without pulling the cylinder, is the 487K21 the right approach?
The 487K21 is a fixed plug: rekeying means servicing the 2 inch Corbin Russwin mortise cylinder at the plug itself. Facilities that want to change keying at the door without disassembly usually standardize on full size interchangeable core hardware instead - the Schlage 20-057 is a 6-pin FSIC rim cylinder with a convertible tailpiece cam, and the 20-057-C is a full size interchangeable core in the C keyway, finished 643E Aged Bronze. That is a different keying program from the Corbin Russwin 77A2 system the 487K21 belongs to.
13) How does the 7-pin count of the 487K21 compare with other cylinders when I need higher key control?
The Corbin Russwin 487K21 is a 7-Pin X Class plug on the proprietary 77A2 keyway, which controls key duplication through the Corbin Russwin keying system. Among other 7-pin options, the BEST 1CDF is a drill resistant patented interchangeable core in 7-pin brass. Several commercial cylinders run fewer pins - the Detex MC65 and Schlage 20-021 are 6-pin, and the Adams Rite 4036 and BEST 1C5 are 5-pin. Pin count and the patented or proprietary keyway together determine how tightly key duplication is held.
14) Is this plug suitable for a high-traffic school or hospital door?
Yes, it is a commercial-grade part intended for institutional and commercial service, including educational facilities, healthcare, government buildings, multi-tenant residential and retail. The seven-pin X Class format is the reason it gets specified in those settings: it gives tighter key control than a standard pin count on a facility-wide master system.
15) Is the 487K21 a genuine Corbin Russwin part or an aftermarket copy?
Genuine Corbin Russwin, supplied under the Corbin Russwin cylinder parts program, so it fits and functions in the original mortise cylinder bodies without machining or shimming. The model designation to quote on a purchase order is 487K21 77A2.
16) Can an Emtek CY4 cylinder be used in place of the Corbin Russwin 487K21?
No. The Emtek CY4 is a cylinder part sold individually for Emtek residential-style hardware, while the 487K21 is a commercial 7-Pin X Class plug for 2 inch Corbin Russwin mortise cylinders keyed to 77A2. If the door carries Emtek trim, the Medeco 1065244 5-pin rim lazy motion cylinder supplied with an Emtek tailpiece is the retrofit path. The 487K21 belongs only in Corbin Russwin mortise cylinder shells.
How fast can I get the Corbin Russwin 487K21 77A2 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 77A2 626 come with a warranty?
Absolutely. The Corbin Russwin 487K21 77A2 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 77A2 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 77A2 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.
!