Corbin Russwin 606K78 7-Pin In...
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Corbin Russwin 606K78 7-Pin Individual X Class Cylinder Plug for 2-3/4" Mortise with 77A1 Keyway

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Model: 606K78 77A1 626

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

$94.00
$81.02
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Corbin Russwin 606K78 7-Pin Individual X Class Cylinder Plug for 2-3/4" Mortise with 77A1 Keyway

The Corbin Russwin 606K78 is a 7-Pin Individual X Class cylinder plug engineered specifically for 2-3/4" mortise lock applications. Designed for compatibility with the 77A1 keyway, this replacement cylinder plug delivers the precision and reliability that commercial-grade door hardware demands. Finished in satin brass, it integrates seamlessly into existing Corbin Russwin cylinder assemblies as a professional-grade replacement component.

Key Features

  • 7-Pin X Class Configuration: Individual X Class plug provides enhanced key control and security appropriate for commercial locking applications.
  • 2-3/4" Mortise Compatibility: Precision-engineered for 2-3/4" mortise lock cylinders, ensuring accurate fit and reliable operation in standard commercial mortise hardware.
  • 77A1 Keyway: Manufactured to accept the 77A1 keyway, maintaining keyway-specific key control and compatibility with existing Corbin Russwin keying systems.
  • Satin Brass Finish: Factory-applied satin brass finish coordinates with complementary door hardware finishes in commercial installations.
  • Genuine Corbin Russwin Cylinder Part: Authentic OEM replacement component designed to maintain original cylinder performance and security specifications.
  • Commercial-Grade Construction: Built to the tolerances and quality standards associated with Corbin Russwin's commercial cylinder product line.

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: 606K78 77A1
  • Features: Corbin Russwin Cylinder Parts

Typical Applications

  • Commercial Office Building Mortise Lock Cylinder Replacement
  • Educational Facility Door Hardware Maintenance
  • Healthcare Institution Lock Cylinder Servicing
  • Government and Municipal Building Hardware Repair
  • Hospitality Facility Door Hardware Upkeep
  • Multi-Tenant Commercial Property Maintenance Programs
  • Institutional Facility Locksmith and Hardware Servicing

Why Corbin Russwin 606K78?

Corbin Russwin cylinder parts are manufactured to the precise tolerances required for dependable commercial locking performance. The 606K78 Individual X Class plug upholds the security integrity of the original cylinder assembly, making it the correct choice for maintenance professionals and locksmiths servicing Corbin Russwin mortise hardware in demanding 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:
606K78 77A1
Features:
Corbin Russwin Cylinder Parts

Corbin Russwin 606K78 77A1 626 – Frequently Asked Questions

1) Is the Corbin Russwin 606K78 a complete mortise cylinder or just the plug?
It's the plug only, not a full cylinder. The 606K78 is a 7-pin Individual X Class cylinder plug that drops into an existing Corbin Russwin 2-3/4 inch mortise cylinder assembly. If your cylinder shell, cam and housing are still good and you only need to change the plug and keying, this is the part. If you need the whole cylinder, order a complete mortise cylinder instead.
2) Will the 606K78 plug work with my existing Corbin Russwin keys?
Only if your system runs the 77A1 keyway. The 606K78 is cut for 77A1, so it keeps key control within that keyway family and accepts keys from an existing 77A1 Corbin Russwin system once pinned to your bitting. A different Corbin Russwin keyway will not enter this plug, so confirm the keyway stamped on your current cylinder before ordering.
3) If the whole mortise cylinder needs replacing instead of just the plug, what complete mortise cylinder is available?
The Corbin Russwin 606K78 is a 7-pin Individual X Class cylinder plug for 2-3/4" mortise locks with the 77A1 keyway, so it replaces the plug inside an existing cylinder body rather than the cylinder itself. When the whole cylinder is being swapped, the Adams Rite 4036 is a complete mortise cylinder with five-pin security, listed as Grade 1 in the 4036 Series. Choosing the 4036 means the keying moves to that cylinder's keyway rather than staying in a Corbin Russwin 77A1 system.
4) Is a Detex MC65 mortise cylinder a substitute for the Corbin Russwin 606K78?
No. The 606K78 is a cylinder plug component that keeps an existing Corbin Russwin mortise cylinder on the 77A1 keyway. The Detex MC65 is a complete mortise cylinder, 1-1/8", 6-pin, with a Schlage C keyway. It installs as a full cylinder in the lock and uses Schlage C keys, so it is a keyway change rather than a like-for-like repair of a 77A1 cylinder.
5) For a facility that wants to rekey doors without pulling cylinders, what interchangeable core option compares to the 606K78?
Replacing the 606K78 plug requires disassembling the mortise cylinder to change the pinning. Facilities that want core swaps instead look at interchangeable cores such as the BEST 1CB Peaks 150 Series interchangeable core cylinder, the BEST 1CDF drill resistant patented 7-pin brass 150 Series core, or the Schlage 20-057 6-pin FSIC rim cylinder with a convertible tailpiece cam. Those systems change the key by exchanging the core, while the 606K78 keeps the Corbin Russwin 77A1 mortise cylinder it was built for.
6) The opening uses a rim exit device, not a mortise lock. What cylinder should be ordered instead of the 606K78?
The 606K78 plug is engineered for 2-3/4" mortise lock cylinders and will not serve a rim device. For rim applications, the Schlage 20-021 is a 6-pin rim cylinder with a vertical tailpiece cam and two keys, and the Schlage 20-022 is the same 6-pin rim cylinder with a horizontal tailpiece cam and two keys. The cam orientation is matched to the exit device being used.
7) Can the 606K78 be used in a key-in-knob or key-in-lever lock?
No. The 606K78 plug is precision-engineered for 2-3/4" mortise lock cylinders. Key-in-knob and key-in-lever bodies take their own cylinders, such as the Kaba Ilco 1539 Series universal key-in-knob/lever cylinder, the Kaba Ilco 1599 key-in-knob replacement cylinder, the Kaba Ilco 1579 knob and lever cylinder for Sargent, or the Falcon A23161-05 G key-in-lever cylinder in the 6-pin G keyway.
8) What does 7-pin X Class mean on a Corbin Russwin cylinder plug?
Seven pin chambers instead of the common six, in Corbin Russwin's Individual X Class configuration, which is a restricted-style key control arrangement for commercial locking. The extra chamber increases the number of possible bittings and the plug has to be pinned to match the rest of the keying system, so a locksmith is doing the build. A 6-pin plug from another brand is not a substitute.
9) I want interchangeable cores so I can rekey without a locksmith. Is this the right part?
No. The 606K78 is a conventional pinned plug that has to be pulled and repinned to change keying. If you want to swap keying by hand across a building, look at an interchangeable core system instead, such as the BEST 1CB 150 Series interchangeable core, the BEST 1CDF drill-resistant 7-pin core, or Schlage's 20-057 full size interchangeable core rim cylinder. Those are a different platform, so it's a housing change, not a drop-in.
10) I'm standardizing mortise cylinders across a building. Can I use the 606K78 on aluminum storefront doors too?
Not as a straight answer. This plug serves Corbin Russwin 2-3/4 inch mortise cylinder bodies, which is standard commercial mortise lock prep. Narrow stile aluminum storefront typically takes a short mortise cylinder for a deadlock, where something like the Adams Rite 4036 Grade 1 mortise cylinder is the usual fit. Keep the mortise lock doors on the Corbin Russwin 77A1 system and spec the storefront separately.
11) What is a lower pin count alternative if a 7-pin plug is more than the application needs?
The 606K78 is a 7-pin Individual X Class plug. Where fewer pins suffice, the BEST 1C Series standard 5-pin cylinder core and the Adams Rite 4036 five-pin mortise cylinder are 5-pin options, and the Falcon A23161-05 G is a 6-pin key-in-lever cylinder in the RU/T Series G keyway, keyed different with two cut keys. Each of those moves the door off the Corbin Russwin 77A1 keying system the 606K78 preserves.
12) What cylinder goes in a deadbolt rather than a mortise lock?
The 606K78 is a mortise cylinder plug and is not a deadbolt part. For deadbolt work, the Kaba Ilco 1549 Series is a key-in-deadbolt cylinder 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.
13) Which cylinder suits an aluminum storefront door with an Adams Rite MS deadlock instead of a mortise lock?
The Corbin Russwin 606K78 plug is a commercial mortise cylinder component and does not address storefront deadlock trim. 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 with through-screws. The 4026 five pin tumbler cylinder pull is for wood door applications with the Adams Rite 5017 wood door deadlock or deadlatch.
14) What cylinder is used for Emtek handlesets rather than a Corbin Russwin mortise lock?
The 606K78 plug is specific to Corbin Russwin 2-3/4" mortise cylinders on the 77A1 keyway and will not fit Emtek trim. For Emtek, the Emtek CY4 cylinder is sold each, the Medeco 1065244 is a 5-pin rim lazy motion rim type cylinder with an Emtek tailpiece, and the Medeco 1065140 is a 5-pin retrofit cylinder for the Arrow JL interconnected lock and Emtek handleset and deadbolt outside cylinder.
15) Is the 606K78 plug meant for commercial doors or residential?
Commercial. It's built for Corbin Russwin mortise hardware in offices, schools, healthcare, government buildings, hotels and multi-tenant properties, and it's the sort of part a facility locksmith stocks for rekey and repair work rather than something you'd find on a house door.
16) Is the 606K78 a genuine Corbin Russwin part or an aftermarket copy?
Genuine Corbin Russwin. It's an OEM cylinder component made to the original tolerances, which matters on a plug because it has to turn freely in the existing shell and drive the cam without binding.
17) Is there a non-keyed option for an opening where the cylinder is only cosmetic?
The 606K78 is a functioning 7-pin keyed plug on the 77A1 keyway. Where an opening needs the appearance of a cylinder without keyed operation, the BEST 12E Series dummy rim cylinder with a 1-5/32" diameter serves that role. It is a rim format part, so it does not fill a 2-3/4" mortise lock cylinder the way the 606K78 does.
18) What finishes does the 606K78 come in compared with a peer FSIC core?
The Corbin Russwin 606K78 7-pin X Class mortise plug is offered in 606 satin brass and 626 satin chrome. Among comparable cylinders, the Schlage 20-057-C full size interchangeable core in C keyway is listed in 643E aged bronze. That is a darker bronze tone rather than a brass or chrome match, which matters when the cylinder face has to blend with existing trim.
How fast can I get the Corbin Russwin 606K78 77A1 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 606K78 77A1 626 come with a warranty?
Absolutely. The Corbin Russwin 606K78 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 606K78 77A1 626?
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