KSP 408EXT-L-1 LFIC Housing Ex...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$57.15
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KSP 408EXT-L-1 LFIC Housing Extension for KSP 408 Housings with Stackable Extension, Drive Extension and Screws

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Model: 408EXT-L-5

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

$57.15
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KSP 408EXT-L-1 LFIC Housing Extension for KSP 408 Housings with Stackable Extension, Drive Extension and Screws

The KSP 408EXT-L-1 is a purpose-built Large Format Interchangeable Core (LFIC) Housing Extension designed specifically for use with KSP 408 Housings. This commercial-grade replacement part includes a stackable extension, drive extension, and all necessary screws, delivering a complete accessory solution for extending or reconfiguring your existing KSP 408 cylinder housing installation. Engineered for seamless compatibility, this IC core accessory ensures reliable integration within KSP cylinder systems in demanding commercial environments.

Key Features

  • Complete Extension Kit: Includes a stackable extension, drive extension, and screws — everything needed for a full housing extension without sourcing additional components.
  • LFIC Compatibility: Specifically designed for Large Format Interchangeable Core (LFIC) applications, ensuring proper fit and function within compatible KSP 408 Housing configurations.
  • KSP 408 Housing Specific: Engineered exclusively for KSP 408 Housings, guaranteeing precise dimensional alignment and reliable mechanical engagement.
  • Stackable Extension Design: The included stackable extension allows for modular configuration, supporting flexible installation requirements across various door preparations.
  • Drive Extension Included: The drive extension ensures proper actuator engagement between the cylinder and the lock mechanism, maintaining reliable operation after housing adjustment.
  • Commercial-Grade Construction: Classified as a commercial product within the Mechanical Locks category, built to perform in high-demand environments.
  • KSP Cylinder Parts and Accessories: Part of the KSP Cylinder Parts & Accessories line, ensuring manufacturer-backed compatibility and consistent quality standards.

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: IC Core
  • Parts and Accessories Type: Replacement Parts
  • Commercial/Residential: Commercial
  • Product Model: 408EXT-L-1
  • Features: KSP Cylinder Parts & Accessories

Typical Applications

  • Commercial Office Buildings Requiring IC Core Cylinder Upgrades
  • Educational Facilities with KSP 408 Cylinder Installations
  • Healthcare Institutions Using Large Format Interchangeable Core Systems
  • Government and Municipal Buildings with Commercial-Grade Locking Systems
  • Retail Establishments Maintaining KSP Cylinder Hardware
  • Multi-Tenant Residential and Mixed-Use Properties with Commercial Lock Cores
  • Industrial and Warehouse Facilities Requiring Cylinder Housing Extensions

Why KSP 408EXT-L-1?

The KSP 408EXT-L-1 is a manufacturer-matched replacement part designed to work exclusively with KSP 408 Housings, ensuring precise mechanical compatibility and reliable LFIC core engagement. Its all-inclusive kit format — stackable extension, drive extension, and screws — eliminates guesswork and simplifies installation for commercial door hardware professionals. For facilities that depend on KSP cylinder systems, this extension delivers the exact components needed to maintain consistent, high-performance operation.

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:
IC Core
Parts and Accessories Type:
Replacement Parts
Commercial/Residential:
Commercial
Product Model:
408EXT-L-1
Features:
KSP Cylinder Parts & Accessories

KSP 408EXT-L-5 – Frequently Asked Questions

1) What lengths does the KSP 408EXT-L-1 housing extension come in?
Four extension lengths: 1/2 inch, 3/4 inch, 1 inch and 2 inch. Each is a stackable extension, so you pick the length that makes up the gap between your KSP 408 housing and the finished door or fixture thickness you are working with.
2) Will the 408EXT-L-1 extension fit a housing other than a KSP 408?
No. The 408EXT-L-1 is built for KSP 408 housings only, for the dimensional alignment and drive engagement to work. If your cylinder housing is another brand or another KSP series, this extension is not the part to order.
3) Do I need to order screws or a drive piece separately with a KSP 408 housing extension?
No, it ships as a kit: the stackable extension, the drive extension, and the screws are all included. The drive extension is what keeps the cylinder actuator engaged with the lock mechanism once you have added length to the housing.
4) Is this an interchangeable core, or just the housing hardware?
It is housing hardware, not a core. The 408EXT-L-1 extends an existing KSP 408 large format interchangeable core housing; your LFIC core is separate. If what you actually need is the core itself, a large format core such as the Schlage Commercial 20-207 sub-assembled FSIC core in S123 keyway is that part.
5) Can a Schlage 20-207 core be used in place of the KSP 408EXT-L-1 extension?
No, they are different kinds of part. The KSP 408EXT-L-1 is a housing extension kit for KSP 408 housings, supplying a stackable extension, a drive extension and screws so an existing housing can be lengthened. The Schlage Commercial 20-207 is a sub-assembled core only with an S123 keyway, functioning as an LFIC core. If the cylinder itself needs replacing, the 20-207 is the core; if the housing needs to reach further through the door prep, the 408EXT-L-1 is the extension.
6) Can I stack two KSP 408 extensions to get more length?
The extension is a stackable design, meant for modular configuration across different door preparations. That is how KSP handles varying build-outs rather than offering a single fixed depth.
7) Does adding a housing extension change which LFIC core I can use?
No. It is a large format interchangeable core application either way; the extension adds housing length and carries the drive engagement forward, so the same LFIC core keying stays in place. Your keying and keyway are unaffected.
8) For a large format interchangeable core opening, what part handles the core and what handles housing depth?
The core is the keyed, removable element: the Schlage Commercial 20-207 is an LFIC core, supplied sub-assembled with an S123 keyway. Housing depth is handled separately by the KSP 408EXT-L-1, an LFIC housing extension for KSP 408 housings offered in 1/2 inch, 3/4 inch, 1 inch and 2 inch extension lengths, with a drive extension so the actuator still engages the lock after the housing is lengthened.
9) We standardize on LFIC across the building - does ordering the KSP 408EXT-L-1 commit us to a keyway?
No. The 408EXT-L-1 is a replacement part - a stackable extension, drive extension and screws - and carries no keying or keyway of its own. Keyway is decided by the core you install, as with the Schlage Commercial 20-207, which is supplied in the S123 keyway. So the extension can be ordered independently of your keying program.
10) Is the KSP 408EXT-L-1 suitable for high-traffic commercial buildings?
It is classified as a commercial part, used in offices, schools, healthcare, government buildings, retail, multi-tenant residential and warehouses that run KSP 408 cylinder housings. For a property manager standardizing on KSP cylinders, it is the manufacturer-matched extension rather than a shimmed workaround.
How fast can I get the KSP 408EXT-L-5 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 KSP 408EXT-L-5 come with a warranty?
Absolutely. The KSP 408EXT-L-5 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 KSP 408EXT-L-5?
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
Why buy the KSP 408EXT-L-5 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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