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 77B1 Keyway, Satin Brass

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Model: 606K78 77B1 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 77B1 Keyway, Satin Brass

The Corbin Russwin 606K78 77B1 is a 7-Pin Individual X Class replacement cylinder plug engineered for 2-3/4" mortise lock applications. Featuring the 77B1 keyway and a Satin Brass finish, this commercial-grade component delivers precise key control and reliable cylinder performance. Designed as a direct replacement part within the Corbin Russwin cylinder parts lineup, it integrates seamlessly into compatible mortise lock assemblies requiring the 77B1 keyway specification.

Key Features

  • 7-Pin Configuration: Individual X Class plug with a 7-pin design for enhanced key control and security in commercial mortise applications.
  • Mortise Compatibility: Engineered specifically for 2-3/4" mortise lock cylinders, ensuring a proper fit in compatible assemblies.
  • 77B1 Keyway: Precise 77B1 keyway specification provides controlled key duplication and system keying flexibility.
  • Satin Brass Finish: Satin Brass finish provides a professional aesthetic suitable for commercial door hardware installations.
  • X Class Plug: Individual X Class designation supports organized keying systems and master key hierarchy configurations.
  • Genuine Corbin Russwin Cylinder Part: An authentic Corbin Russwin cylinder component designed for direct integration with compatible Corbin Russwin mortise lock systems.
  • Commercial-Grade Construction: Built to commercial standards for durability and long-term performance in demanding door hardware 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: 606K78 77B1
  • 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 606K78?

Corbin Russwin cylinder parts are manufactured to exacting commercial standards, ensuring compatibility and reliable performance within Corbin Russwin mortise lock systems. The 606K78 77B1 plug's 7-pin Individual X Class configuration supports professional-grade keying systems where precision, security, and long-term durability are essential requirements for high-traffic 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 77B1
Features:
Corbin Russwin Cylinder Parts

Corbin Russwin 606K78 77B1 626 – Frequently Asked Questions

1) Will a 77B1 keyway plug work in my existing Corbin Russwin master key system?
Only if your system is built on the 77B1 keyway. The plug is cut to the 77B1 keyway specification and is an Individual X Class plug, which is what supports organized keying and master key hierarchies. Keys from a different Corbin Russwin keyway will not enter it, so confirm the keyway stamped on the cylinders you are servicing matches 77B1 before ordering.
2) Does the 606K78 plug fit a 1-1/8 inch mortise cylinder?
No. The 606K78 is built for 2-3/4 inch mortise lock cylinders. A 1-1/8 inch cylinder is a different length shell and the plug is not interchangeable. For a short 1-1/8 inch mortise cylinder you would be looking at a complete cylinder such as the Detex MC65, which is a 1-1/8 inch 6-pin mortise cylinder in the Schlage C keyway.
3) Is a rim cylinder an acceptable substitute for the Corbin Russwin 606K78 mortise plug?
No. The 606K78 77B1 is a plug for 2-3/4 inch mortise cylinder assemblies, while rim cylinders mount through the door face and drive an exit device or rim lock with a tailpiece. Schlage's 20-021 is a 6-pin rim cylinder with a vertical tailpiece cam and the 20-022 is the same cylinder with a horizontal tailpiece cam; the BEST 12E Series dummy rim cylinder with a 1-5/32 inch diameter is another rim-format part. None of those drop into a mortise lock body in place of a mortise cylinder plug.
4) For a facility that wants to rekey without disassembling cylinders, is there an alternative to the 606K78 plug?
The Corbin Russwin 606K78 77B1 is a 7-pin Individual X Class plug that is pinned and installed as a replacement part inside a mortise cylinder. Where the goal is rekeying by pulling a core with a control key instead, an interchangeable-core cylinder is the different approach: the BEST Peaks 1CB is a 150 Series interchangeable core cylinder, the BEST 1CDF is a drill-resistant patented interchangeable core 7-pin brass 150 Series core, and Schlage's 20-057 is a 6-pin full-size interchangeable core rim cylinder with a convertible tailpiece cam. Those are separate keying platforms and do not accept the 77B1 keyway.
5) If the whole mortise cylinder needs replacing instead of just the plug, what should be used?
The Corbin Russwin 606K78 77B1 is a replacement cylinder plug for 2-3/4 inch mortise applications, so it only serves an assembly whose housing and pins are still serviceable. When the entire cylinder is being swapped out, a complete mortise cylinder is the item to order - for example the Detex MC65, a 1-1/8 inch 6-pin mortise cylinder cut to the Schlage C keyway, or the Adams Rite 4036 mortise cylinder, a Grade 1 five-pin unit from the 4036 Series. Note that both of those carry their own keyways rather than the Corbin Russwin 77B1, so they will not key into an existing 77B1 system.
6) The lock is a key-in-lever or deadbolt rather than a mortise lock - what cylinder should be ordered instead of the 606K78?
The Corbin Russwin 606K78 77B1 plug is built for 2-3/4 inch mortise lock cylinders and will not serve a key-in-lever or deadbolt body. For those, 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; Kaba Ilco's 1539 Series is a key-in-knob/lever universal cylinder and the 1549 Series is a key-in-deadbolt cylinder. The Kaba Ilco 1579 is the knob and lever cylinder for Sargent locks, and the 1599 is a key-in-knob replacement cylinder.
7) Will this Corbin Russwin plug work in a rim cylinder or an exit device?
No. It is a mortise cylinder plug for 2-3/4 inch mortise applications. Rim devices take a rim cylinder with a tailpiece, for example the Schlage 20-021 with a vertical tailpiece cam or the 20-022 with a horizontal cam.
8) Does the 606K78 come with keys?
The 606K78 is sold as the cylinder plug itself, a replacement part in the Corbin Russwin cylinder parts line. If you need a cylinder supplied keyed with cut keys, that is a different item, for example the Falcon A23161-05 G, which is listed as keyed different with 2 cut keys.
9) What is the 5-pin equivalent if a 7-pin plug is more than the opening needs?
The Corbin Russwin 606K78 77B1 is a 7-pin Individual X Class plug intended for commercial mortise systems with master key hierarchies. On simpler openings a 5-pin part is the lighter option: the BEST 1C5 is a standard 5-pin cylinder core, and the Adams Rite 4036 is a Grade 1 five-pin mortise cylinder. Both use their own keyways, so they suit a new or standalone keying scheme rather than an existing 77B1 system.
10) Will the 606K78 plug work in an Adams Rite MS1847 deadlock application?
No. The 606K78 77B1 is a Corbin Russwin replacement plug for 2-3/4 inch mortise cylinders. Adams Rite MS1847 deadlock and deadlatch openings are served by their own cylinder pulls: the 4024 cylinder pull with trim plate mounting and the 4025 five pin tumbler cylinder pull with through-screws are both specified for the MS1847, while the 4026 five pin tumbler cylinder pull is for the Adams Rite 5017 wood door deadlock and deadlatch.
11) For residential handlesets and deadbolts, is the 606K78 the right cylinder part?
No - the 606K78 77B1 plug is a commercial part for Corbin Russwin mortise cylinders. Residential handleset and deadbolt retrofits are covered by rim-type lazy motion cylinders instead: the Medeco 1075127 is a 5-pin rim type lazy motion single cylinder for handlesets and deadbolts, the 1012040 is a 6-pin lazy motion rim cylinder for Kwikset single cylinder deadbolts, the 1065244 is a 5-pin rim lazy motion cylinder with an Emtek tailpiece, and the 1065140 is a 5-pin retrofit cylinder for Arrow JL interconnected locks and Emtek handleset and deadbolt outside cylinders. Emtek's own CY4 cylinder is sold individually as a parts item.
12) Does a full-size interchangeable core like the Schlage 20-057-C key into the same system as the 606K78 77B1?
No. The 606K78 77B1 carries the Corbin Russwin 77B1 keyway, which is what lets it fold into an existing 77B1 master key hierarchy. The Schlage 20-057-C is a full size interchangeable core cylinder cut to the Schlage C keyway and supplied in 643E Aged Bronze, a separate keyway family - keys are not interchangeable between the two.
13) What finishes does the Corbin Russwin 606K78 plug come in?
Two: 606 Satin Brass and 626 Satin Chrome. Pick the one that matches the cylinder collar and the trim already on the door, since the plug face is the part you see through the escutcheon.
14) Is this plug suitable for high-traffic commercial doors, or is it a residential part?
Commercial. The 606K78 is a commercial-grade Corbin Russwin cylinder component, used in office buildings, schools, healthcare, government buildings, multi-tenant residential, retail and warehouse facilities. It is not a residential-duty part.
How fast can I get the Corbin Russwin 606K78 77B1 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 77B1 626 come with a warranty?
Absolutely. The Corbin Russwin 606K78 77B1 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 77B1 626?
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