Corbin Russwin 487K21 27A1 7-P...
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Corbin Russwin 487K21 27A1 7-Pin X Class Mortise Cylinder Plug, 2" with 27A1 Keyway in Satin Brass

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Model: 487K21 27A1 626

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

$94.00
$81.02
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Corbin Russwin 487K21 27A1 7-Pin X Class Mortise Cylinder Plug, 2" with 27A1 Keyway in Satin Brass

The Corbin Russwin 487K21 27A1 is a 7-Pin X Class replacement plug designed for 2" mortise cylinder applications in commercial door hardware. Featuring the 27A1 keyway and a Satin Brass finish, this genuine Corbin Russwin cylinder part is engineered to integrate seamlessly with compatible mortise lock assemblies. Intended for professional use, this replacement plug supports reliable keying performance in demanding commercial environments.

Key Features

  • 7-Pin X Class Construction: Seven-pin X Class plug configuration provides enhanced security and key control for commercial mortise cylinder applications.
  • 2" Mortise Cylinder Format: Precisely sized at 2" for direct compatibility with standard mortise lock assemblies requiring a plug replacement.
  • 27A1 Keyway: Configured with the 27A1 keyway to ensure proper key compatibility and system integration within Corbin Russwin keying systems.
  • Satin Brass Finish: Finished in Satin Brass for a refined, professional appearance consistent with commercial hardware aesthetics.
  • Genuine Corbin Russwin Cylinder Part: Manufactured as an authentic Corbin Russwin component, ensuring fit, function, and quality consistent with original equipment.
  • Commercial-Grade Replacement Part: Designed specifically for commercial applications, supporting high-cycle use and professional installation requirements.

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 27A1
  • 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 487K21?

Corbin Russwin cylinder components are built to the exacting standards expected of professional commercial door hardware, delivering genuine OEM compatibility and reliable keying performance. The 487K21 27A1 plug is a purpose-built replacement part that maintains the integrity of your existing mortise cylinder system with an authentic Corbin Russwin component. For facilities managers and locksmiths who demand consistent, dependable hardware, Corbin Russwin cylinder parts are the professional choice.

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 27A1
Features:
Corbin Russwin Cylinder Parts

Corbin Russwin 487K21 27A1 626 – Frequently Asked Questions

1) Will a 27A1 keyway plug work in my existing Corbin Russwin master key system?
It will work only if your system is built on the 27A1 keyway. The 487K21 is configured with the 27A1 keyway so keys cut for that keyway operate it, and it pins into a Corbin Russwin keying system using that section. A plug in a different keyway section will not accept your existing keys, so confirm the keyway stamped on the cylinder you are servicing before ordering.
2) How many pins does the Corbin Russwin 487K21 plug take?
Seven. It is a 7-Pin X Class plug, so it must be pinned into a seven-pin cylinder shell and keyed to a seven-pin system. A six-pin cylinder is a different chamber count and this plug is not a substitute for it. By comparison the Adams Rite 4036 mortise cylinder is five-pin and the Detex MC65 is six-pin.
3) Can I use this plug on a rim cylinder or a key-in-knob cylinder?
No. The 487K21 is sized for 2 inch mortise cylinder applications and is not a rim or key-in-lever part. For rim work, the Schlage 20-021 (vertical tailpiece cam) and 20-022 (horizontal tailpiece cam) are six-pin rim cylinders. For key-in-knob or lever replacement, the Kaba Ilco 1539 universal knob/lever cylinder or the Falcon A23161-05 G six-pin lever cylinder are the right family.
4) I need a complete mortise cylinder, not just a plug. What should I order instead of the Corbin Russwin 487K21 27A1?
The Corbin Russwin 487K21 27A1 is a 7-pin X Class replacement plug for 2 inch mortise cylinder applications, so it goes into an existing cylinder shell rather than replacing the whole cylinder. If you need a complete mortise cylinder, the Detex MC65 is a mortise cylinder with a Schlage C keyway, 1-1/8 inch, 6-pin, and the Adams Rite 4036 is a five-pin mortise cylinder in the 4036 Series with a 1/2 inch minimum door thickness. Both are full cylinders, and neither uses the Corbin Russwin 27A1 keyway, so they will not key into an existing 27A1 system.
5) Is a BEST interchangeable core the same kind of part as a Corbin Russwin 487K21 plug?
No. The 487K21 27A1 is a 7-pin X Class plug with the Corbin Russwin 27A1 keyway that is fitted into a 2 inch mortise cylinder. BEST interchangeable cores such as the 1CB 150 Series core, the 1C Series standard 5-pin core, and the 1CDF drill resistant patented 7-pin brass 150 Series core are figure-eight removable cores that drop into a BEST-prepped housing without rebuilding the cylinder. Even the 7-pin 1CDF is not a substitute for a 27A1 plug, because the core format and keyway differ.
6) My exit device takes a rim cylinder, not a mortise cylinder. What do I use in place of the 487K21?
The 487K21 27A1 is a plug for 2 inch mortise cylinder applications and will not serve a rim-prepped exit device. For rim applications, the Schlage 20-021 is a 6-pin rim cylinder with a vertical tailpiece cam and two keys, and the 20-022 is the same 6-pin rim cylinder with a horizontal tailpiece cam. If you want a removable core on the rim side, the Schlage 20-057 is a 6-pin full size interchangeable core rim cylinder with a convertible tailpiece cam.
7) We want removable cores so we can rekey without pulling cylinders. What should we standardize on instead of 487K21 plugs?
The Corbin Russwin 487K21 27A1 is a 7-pin X Class plug, which means rekeying involves working the cylinder itself. If the goal is swapping cores in the field, the Schlage 20-057-C is a full size interchangeable core cylinder in the C keyway with a 643E Aged Bronze finish, and BEST offers small format interchangeable cores including the 1CB 150 Series core and the 1CDF drill resistant patented 7-pin brass 150 Series core. Standardizing on an interchangeable core platform is a change of keying system, so existing 27A1 keys will not carry over.
8) Does the Corbin Russwin 487K21 plug come with keys?
The 487K21 is a plug sold as a replacement cylinder component, keyed to the 27A1 section of a Corbin Russwin system. It is intended for professional installation and keying, so plan on a locksmith pinning it to your existing system rather than expecting a factory-cut key set. If you need a cylinder that ships with keys, the Schlage 20-021 and 20-022 rim cylinders and the Falcon A23161-05 G lever cylinder are supplied with two keys.
9) Is this an OEM Corbin Russwin part or an aftermarket plug?
Genuine Corbin Russwin. The 487K21 27A1 is an authentic manufacturer cylinder component, which matters on X Class systems because key control and pinning tolerances have to match the rest of the system exactly.
10) If I want an interchangeable core instead of a pinned plug, what should I look at?
A plug like the 487K21 has to be pinned by a locksmith and pulled from the shell to rekey. If you would rather swap cores by hand, look at an interchangeable core format instead: BEST offers the 1C Series standard 5-pin core, the 1CB 150 Series core, and the 1CDF drill resistant 7-pin brass core. Schlage's 20-057 is a six-pin full size interchangeable core rim cylinder with a convertible tailpiece cam. Note that moving to IC cores means changing the cylinder housing, not just the plug.
11) I need a cylinder for a key-in-lever or key-in-knob lock, not a mortise cylinder plug. What are my options?
The Corbin Russwin 487K21 27A1 plug is built for 2 inch mortise cylinder applications, so it is the wrong format for key-in-knob or key-in-lever trim. For those, the Falcon A23161-05 G is a key-in-lever cylinder with a 6-pin G keyway supplied keyed different with two cut keys, and the Kaba Ilco 1539 Series is a key-in-knob or lever universal cylinder. The Kaba Ilco 1579 is a knob and lever cylinder for Sargent locks, and the 1599 is a key-in-knob replacement cylinder.
12) What is the difference between the 487K21 27A1 plug and a cylinder pull like the Adams Rite 4025?
They do different jobs. The Corbin Russwin 487K21 27A1 is a keyed plug that goes inside a 2 inch mortise cylinder. The Adams Rite 4025 is a five pin tumbler cylinder pull with through-screws for the MS1847 deadlock, the 4024 is a cylinder pull with trim plate mounting for the same MS1847 deadlock and deadlatch systems, and the 4026 is a five pin tumbler cylinder pull for wood door applications with the Adams Rite 5017 wood door deadlock. Those are door-mounted pull assemblies for narrow stile and wood door deadlocks, not internal cylinder components.
13) I only need to fill a cylinder hole with no key function. Is the 487K21 27A1 the right part?
No. The Corbin Russwin 487K21 27A1 is a working 7-pin X Class keyed plug with the 27A1 keyway, intended to support keying in a commercial mortise cylinder. For a blank opening with no key function, the BEST 12E Series dummy rim cylinder with a 1-5/32 inch diameter fills a rim-prepped hole without operating anything.
14) Can I use a Medeco retrofit cylinder instead of the Corbin Russwin 487K21 on a commercial mortise lock?
They address different hardware. The 487K21 27A1 is a commercial mortise cylinder plug in a 2 inch format. The Medeco comparables are retrofit cylinders aimed at residential-style handlesets and deadbolts: the 1012040 is a 6-pin lazy motion rim cylinder for Kwikset single cylinder deadbolts, the 1065140 is a 5-pin retrofit for the Arrow JL interconnected lock and Emtek handleset and deadbolt outside cylinder, the 1065244 is a 5-pin lazy motion rim type cylinder with an Emtek tailpiece, and the 1075127 is a 5-pin rim type lazy motion single cylinder for handlesets and deadbolts. None of these fit a mortise cylinder shell.
15) Is the 487K21 suitable for a high-traffic commercial building or is it a residential part?
It is a commercial part, built for high-cycle use in offices, schools, healthcare, government buildings, retail, multi-tenant residential and warehouse facilities. Property managers standardizing a building on one Corbin Russwin keyway can carry this plug as the service part for their 7-pin mortise cylinders.
16) Do the finish choices on the Corbin Russwin 487K21 27A1 match the Schlage 20-057-C?
No. The 487K21 27A1 plug comes in 606 Satin Brass and 626 Satin Chrome. The Schlage 20-057-C full size interchangeable core is listed in 643E Aged Bronze. If you are matching visible cylinder faces across a set of doors, the brass and chrome options on the Corbin Russwin plug are the ones to work from.
How fast can I get the Corbin Russwin 487K21 27A1 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 27A1 626 come with a warranty?
Absolutely. The Corbin Russwin 487K21 27A1 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 27A1 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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