Corbin Russwin 487K21 7-Pin X ...
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$94.00
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Corbin Russwin 487K21 7-Pin X Class Mortise Cylinder Plug with 77A1 Keyway, 2" Satin Brass Replacement Part

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Model: 487K21 77A1 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 77A1 Keyway in Satin Brass

The Corbin Russwin 487K21 is a 7-Pin X Class plug designed for 2" mortise cylinder applications, featuring the 77A1 keyway and finished in Satin Brass. Purpose-built as a precision replacement component for compatible Corbin Russwin mortise lock systems, this cylinder plug delivers the security and keying flexibility expected from a commercial-grade cylinder part. Its 2" mortise format ensures compatibility with standard commercial mortise lock preparations, while the 77A1 keyway provides controlled key access as part of the Corbin Russwin keying system.

Key Features

  • 7-Pin X Class Security: Engineered with a 7-pin X Class plug configuration for enhanced key control and pick resistance in commercial security applications.
  • 2" Mortise Format: Designed to fit standard 2" mortise cylinder housings, ensuring compatibility with a wide range of commercial mortise lock preparations.
  • 77A1 Keyway: Features the Corbin Russwin 77A1 keyway, providing controlled key access and seamless integration within compatible Corbin Russwin keying systems.
  • Satin Brass Finish: Finished in Satin Brass for a professional appearance that complements commercial door hardware installations.
  • Genuine Corbin Russwin Cylinder Part: Manufactured as an authentic Corbin Russwin cylinder component, ensuring precise fit and reliable performance as a replacement part.
  • Commercial-Grade Construction: Built to meet the demands of commercial door hardware applications where consistent, dependable performance is required.

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 77A1
  • Features: Corbin Russwin Cylinder Parts

Typical Applications

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

Why Corbin Russwin 487K21?

Corbin Russwin cylinder parts are engineered to exacting commercial standards, and the 487K21 plug exemplifies that commitment with its 7-pin X Class configuration and precise 77A1 keyway compatibility. As an authentic Corbin Russwin replacement component, it ensures proper fit within compatible mortise lock systems, maintaining the security integrity and keying system consistency that commercial facilities depend on. For facilities managers and locksmiths requiring a genuine, specification-grade cylinder plug, the 487K21 in Satin Brass delivers reliable, professional-grade performance.

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 77A1
Features:
Corbin Russwin Cylinder Parts

Corbin Russwin 487K21 77A1 626 – Frequently Asked Questions

1) Will a 77A1 keyway plug work in my existing Corbin Russwin keying system?
Only if your system is already on the 77A1 keyway. The plug is cut and keyed to the Corbin Russwin 77A1 keyway, so keys from a different Corbin Russwin section will not enter it. Check the keyway stamp on the cylinders you are matching before ordering, since the whole point of replacing a plug rather than a full cylinder is keeping the existing key system intact.
2) Can I use the 487K21 plug in a rim cylinder or a key-in-lever cylinder?
No. It is specified for 2 inch mortise cylinder housings, not rim or key-in-knob/lever bodies. For a rim application look at the Schlage 20-022 rim cylinder with a horizontal tailpiece cam; for key-in-knob or lever replacement, the Kaba Ilco 1539 universal key-in-knob/lever cylinder covers that format.
3) I need a complete mortise cylinder, not just the plug - what should I order instead of the Corbin Russwin 487K21?
The 487K21 is a 7-pin X Class plug for 2 inch mortise cylinders with the 77A1 keyway, so it is a replacement component that goes into an existing cylinder shell rather than a finished cylinder. If the opening needs a whole mortise cylinder, the Adams Rite 4036 is a Grade 1 five-pin mortise cylinder in the 4036 Series, and the Detex MC65 is a 1-1/8 inch six-pin mortise cylinder cut to the Schlage C keyway. Both arrive as assembled cylinders; neither carries the Corbin Russwin 77A1 keyway, so they will not key into an existing 77A1 system.
4) We want to be able to swap cores without pulling the cylinder - is there an alternative to the 487K21?
The 487K21 is a fixed 7-pin X Class plug that is rekeyed as a cylinder component rather than exchanged at the door. For key-removable core work, the BEST 1CB is a 150 Series interchangeable core cylinder and the BEST 1CDF is a drill-resistant patented interchangeable core in 7-pin brass, 150 Series. On the Schlage side, the 20-057 is a six-pin full size interchangeable core rim cylinder with a convertible tailpiece cam, and the 20-057-C is an FSIC core in the C keyway, 643E Aged Bronze. None of these use the Corbin Russwin 77A1 keyway.
5) The lock I am servicing is a key-in-lever, not a mortise lock. Is the 487K21 the right part?
No - the 487K21 is a plug for 2 inch mortise cylinders used in commercial mortise lock preparations. Key-in-lever and key-in-knob locks take a different cylinder body: 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 two cut keys, and the Kaba Ilco 1539 is a universal key-in-knob and lever cylinder in the 1539 Series. The Kaba Ilco 1599 is a key-in-knob replacement cylinder for the same class of lock.
6) The lock is a Sargent, not a Corbin Russwin - can I still use the 487K21 plug?
No. The 487K21 plug is cut to the Corbin Russwin 77A1 keyway and is made as a genuine Corbin Russwin component for compatible Corbin Russwin mortise lock systems. For Sargent knob and lever locks, the Kaba Ilco 1579 is a knob and lever cylinder built for Sargent. Matching the manufacturer's keyway is what determines whether the part will operate and key into the existing system.
7) Can I use a rim cylinder in place of the Corbin Russwin 487K21 mortise plug?
No. The 487K21 is built for 2 inch mortise cylinder housings used in commercial mortise lock preparations. Rim cylinders mount through the door face and drive the lock with a tailpiece - the Schlage 20-021 is a six-pin rim cylinder with a vertical tailpiece cam and the 20-022 is the same cylinder with a horizontal tailpiece cam. Those serve rim exit devices, not a mortise cylinder shell, so they are not a substitute for a mortise plug.
8) What is the difference between the Corbin Russwin 487K21 plug and a BEST 1C5 core?
Both are cylinder internals rather than complete locks, but they belong to different systems. The 487K21 is a 7-pin X Class plug on the Corbin Russwin 77A1 keyway, offered in 606 Satin Brass and 626 Satin Chrome, and it is installed into a 2 inch mortise cylinder shell. The BEST 1C5 is a standard 5-pin cylinder core from the Standard and Premium Cores line, which drops into BEST interchangeable core housings. They are not cross-compatible.
9) I need a cylinder for a deadbolt - does the Corbin Russwin 487K21 work, or is there a better fit?
The 487K21 is a mortise cylinder plug, so it is not the part for a deadbolt. The Kaba Ilco 1549 is a key-in-deadbolt cylinder in the 1549 Series with a deadbolt function, and the Medeco 1012040 is a 6-pin lazy motion rim cylinder for Kwikset single cylinder deadbolts. The Medeco 1075127 is a 5-pin rim type lazy motion single cylinder for handlesets and deadbolts.
10) My door has an Adams Rite MS1847 deadlock. What cylinder part goes with that instead of the 487K21?
The 487K21 is a plug for 2 inch Corbin Russwin mortise cylinders and is not intended for Adams Rite narrow stile deadlocks. For an MS1847 deadlock or deadlatch, the Adams Rite 4024 cylinder pull mounts with a trim plate and the 4025 is a five-pin tumbler cylinder pull using through-screws. For a wood door application with the Adams Rite 5017 deadlock or deadlatch, the 4026 five-pin tumbler cylinder pull is the matching part.
11) Is the 487K21 a genuine Corbin Russwin part or an aftermarket copy?
Genuine Corbin Russwin. It is sold as an authentic Corbin Russwin cylinder replacement component, model 487K21 77A1, which matters when you are rekeying inside an existing Corbin Russwin system and need the plug to seat and rotate correctly in the original housing.
12) Where does a 7-pin mortise cylinder plug like this typically get used?
Commercial openings on mortise locks, office buildings, schools, hospitals, government facilities, retail, warehouses and multi-tenant residential. It is a commercial-only part, so for a house door on a residential deadbolt you would be better served by a retrofit cylinder such as the Medeco 1075127 5-pin rim type lazy motion cylinder for handlesets and deadbolts.
13) Is there a dummy or non-keyed alternative if the opening does not need a working cylinder?
The 487K21 is a keyed 7-pin X Class plug on the 77A1 keyway, so every unit is an operating cylinder component. Where an opening only needs the appearance of a cylinder, the BEST 12E Series dummy rim cylinder measures 1-5/32 inch in diameter and has no keying function. It is a rim-format dummy, not a mortise part, so it fills a rim prep rather than a 2 inch mortise housing.
14) Is the Emtek CY4 cylinder a substitute for the Corbin Russwin 487K21?
They serve different markets. The 487K21 is a commercial 7-pin X Class mortise cylinder plug on the 77A1 keyway, supplied in Satin Brass and Satin Chrome. The Emtek CY4 is sold as a single cylinder in the Emtek parts line for Emtek hardware. If the requirement is to retrofit an Emtek handleset or deadbolt with a high security cylinder, the Medeco 1065140 is a 5-pin retrofit cylinder for the Arrow JL interconnected lock and Emtek handleset and deadbolt outside cylinder, and the Medeco 1065244 is a 5-pin rim lazy motion cylinder supplied with an Emtek tailpiece.
How fast can I get the Corbin Russwin 487K21 77A1 626 delivered?
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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 77A1 626 come with a warranty?
Absolutely. The Corbin Russwin 487K21 77A1 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 77A1 626?
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