Corbin Russwin 606K78 7-Pin In...
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$94.00
$81.02
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Corbin Russwin 606K78 7-Pin Individual X Class Cylinder Plug for 2-3/4" Mortise with 77A2 Keyway

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Model: 606K78 77A2 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 77A2 Keyway

The Corbin Russwin 606K78 is a 7-Pin Individual X Class Cylinder Plug engineered specifically for 2-3/4" mortise lock applications. Featuring the 77A2 keyway and delivered in a Satin Brass finish, this replacement cylinder plug is designed to integrate seamlessly with compatible Corbin Russwin mortise cylinder hardware. As a genuine Corbin Russwin cylinder part, it delivers the precision fit and reliable security performance demanded by commercial-grade door hardware installations.

Key Features

  • 7-Pin Configuration: Individual X Class plug with 7-pin tumbler design for enhanced key control and security depth in commercial applications.
  • 2-3/4" Mortise Compatibility: Precision-engineered for 2-3/4" mortise lock cylinders, ensuring proper fit and reliable operation in compatible hardware.
  • 77A2 Keyway: Configured with the 77A2 keyway for secure, controlled key interchange within the Corbin Russwin keying system.
  • Satin Brass Finish: Finished in Satin Brass to coordinate with complementary door hardware in commercial environments.
  • Genuine Corbin Russwin Cylinder Part: Manufactured as an authentic Corbin Russwin component, ensuring compatibility and performance standards are maintained.
  • Commercial-Grade Replacement Part: Designed for commercial applications where precise cylinder replacement or rekeying is required without full hardware replacement.

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 77A2
  • 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 606K78?

Corbin Russwin cylinder parts are manufactured to exacting commercial standards, delivering precise fit and long-term reliability for mortise lock hardware. The 606K78 X Class plug maintains the integrity of the keying system with a 7-pin configuration and 77A2 keyway, making it the trusted choice for facility managers and locksmiths maintaining commercial door security infrastructure.

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 77A2
Features:
Corbin Russwin Cylinder Parts

Corbin Russwin 606K78 77A2 626 – Frequently Asked Questions

1) Is the Corbin Russwin 606K78 a complete mortise cylinder or just the plug?
It is the plug only, not a complete cylinder. The 606K78 is a 7-pin Individual X Class cylinder plug meant for 2-3/4 inch mortise cylinder applications, sold as a replacement part rather than a full housing. If your existing mortise cylinder shell and cam are sound and you only need to restore or rekey the plug, this is the right part. If the housing itself is damaged, you need a complete mortise cylinder instead, such as the Adams Rite 4036 mortise cylinder.
2) Will the 606K78 plug work in my existing Corbin Russwin keying system?
Only if your system runs the 77A2 keyway. The plug is cut for 77A2, so it keys into a Corbin Russwin system already using that keyway and will not accept keys from any other keyway family. Pull one of your existing keys and confirm the keyway stamp before ordering, since a 7-pin plug in the wrong keyway cannot be made to work with your current keys.
3) We want cores that can be pulled and swapped without disassembling the lock. What is the alternative to the 606K78?
The 606K78 is a 7-pin plug that is serviced as part of the mortise cylinder, so rekeying means working on the cylinder. For a keyed system built around removable cores, BEST offers the 1CB interchangeable core cylinder in the 150 Series and the 1CDF drill resistant patented interchangeable core, a 7-pin brass 150 Series core. Schlage's 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. Those are different keying platforms from the 77A2 keyway.
4) Is the 606K78 the right part for a key-in-lever or key-in-knob lock?
No. The 606K78 is built for 2-3/4 inch mortise cylinder applications. Key-in-lever and key-in-knob locks take a different cylinder body: the Falcon A23161-05 G is a key-in-lever cylinder for the RU/T Series with a 6-pin G keyway supplied keyed different with two cut keys, and Kaba Ilco offers the 1539 universal key-in-knob and lever cylinder, the 1579 knob and lever cylinder for Sargent, and the 1599 key-in-knob replacement cylinder.
5) 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 cylinder plug for 2-3/4 inch mortise applications with the 77A2 keyway, so it goes into existing Corbin Russwin mortise cylinder hardware rather than replacing the housing. When the full cylinder is being swapped, the Adams Rite 4036 is a complete mortise cylinder with five-pin security in the 4036 Series, and the Detex MC65 is a 1-1/8 inch 6-pin mortise cylinder cut to the Schlage C keyway. Both change the keyway away from 77A2, so the opening would need rekeying to the building's system.
6) Can a rim cylinder be used in place of the Corbin Russwin 606K78?
No. The 606K78 is a plug for a 2-3/4 inch mortise cylinder, which threads into the lock case. Rim cylinders such as the Schlage 20-021, a 6-pin rim cylinder with a vertical tailpiece cam, and the 20-022, the same 6-pin rim cylinder with a horizontal tailpiece cam, mount through the door and drive a rim exit device or rim deadlock. They are not interchangeable with a mortise plug.
7) What is the exact model number to order for this Corbin Russwin plug?
Order it as 606K78 77A2, with the finish called out separately as either 606 Satin Brass or 626 Satin Chrome. The 77A2 in the model designation is the keyway, so a distributor cross-referencing it needs that suffix as well as the base number.
8) What cylinder do I use for a deadbolt instead of the 606K78?
The 606K78 is a mortise cylinder plug in the 77A2 keyway and is not a deadbolt cylinder. For deadbolt work, the Kaba Ilco 1549 key-in-deadbolt cylinder carries a deadbolt function, and Medeco offers the 1012040 6-pin lazy motion rim cylinder for Kwikset single cylinder deadbolts, the 1075127 5-pin rim type lazy motion single cylinder for handlesets and deadbolts, and the 1065140 5-pin retrofit cylinder for Arrow JL interconnected locks and Emtek handleset and deadbolt outside cylinders.
9) Our openings use Adams Rite MS1847 deadlocks. Does the Corbin Russwin 606K78 work there?
The 606K78 is a 7-pin plug for 2-3/4 inch Corbin Russwin mortise cylinders and is not built around the MS1847. For that hardware, the Adams Rite 4024 cylinder pull mounts with a trim plate for MS1847 deadlock and deadlatch systems, and the 4025 is a five pin tumbler cylinder pull with through-screws for the MS1847. For a wood door deadlock, the 4026 five pin tumbler cylinder pull is designed for the Adams Rite 5017 wood door deadlock and deadlatch.
10) I need a non-keyed filler for an unused cylinder hole, not a working plug. What should I order?
The Corbin Russwin 606K78 is a functioning 7-pin keyed plug in the 77A2 keyway, so it is not the part for a dead opening. The BEST 12E Series dummy rim cylinder with a 1-5/32 inch diameter serves that purpose for rim prep where no keyed operation is wanted.
11) Is this cylinder plug suitable for high-traffic commercial buildings?
Yes, it is a commercial-grade part. Corbin Russwin lists the 606K78 for commercial use, and it is applied in office buildings, schools, healthcare facilities, government buildings, retail, multi-tenant residential, and industrial sites. For a property manager standardizing a building, the value is that the 7-pin X Class plug keeps key control intact when you rekey one door without swapping out the whole lock.
12) Is the 606K78 a genuine Corbin Russwin part or an aftermarket copy?
Genuine Corbin Russwin. It is catalogued under Corbin Russwin cylinder parts as an authentic component, which matters on a proprietary keyway like 77A2 where an aftermarket plug can throw off key control and interchange within the system.
13) Is there a 5-pin core option instead of the 606K78's 7-pin configuration?
The 606K78 uses a 7-pin tumbler design for added key control depth. If a 5-pin core is what the system is keyed to, the BEST 1C5 is a standard 5-pin cylinder core, and the BEST 1CDF is a 7-pin interchangeable core if pin count is being matched instead. Both are BEST keying platforms rather than the 77A2 keyway.
14) Is the 606K78 suitable for residential Emtek hardware?
The 606K78 is a commercial-grade mortise cylinder plug with the 77A2 keyway, offered in 606 Satin Brass and 626 Satin Chrome. Emtek hardware takes its own cylinder, the Emtek CY4, sold each, and Medeco's 1065244 is a 5-pin rim lazy motion rim type cylinder supplied with an Emtek tailpiece.
How fast can I get the Corbin Russwin 606K78 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 606K78 77A2 626 come with a warranty?
Absolutely. The Corbin Russwin 606K78 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 606K78 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
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