KSP 408EXT-S-1 SFIC Housing Ex...
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$57.15
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KSP 408EXT-S-1 SFIC Housing Extension for 408 Housings with Stackable Extension, Drive Extension and Screws

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Model: 408EXT-S-5

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

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

The KSP 408EXT-S-1 is a Small Format Interchangeable Core (SFIC) Housing Extension designed specifically for use with KSP 408 cylinder housings. This commercial-grade replacement part kit includes a stackable extension, a drive extension, and the necessary screws, providing everything needed to extend the cylinder housing configuration for compatible applications. Engineered for commercial door hardware installations, this cylinder housing extension supports flexible keying system configurations within the KSP 408 housing platform.

Key Features

  • Complete Extension Kit: Includes a stackable extension, drive extension, and mounting screws for a full, ready-to-install solution compatible with KSP 408 housings.
  • SFIC Compatibility: Designed specifically for Small Format Interchangeable Core (SFIC) cylinder housing systems, ensuring proper fit and function within the KSP 408 platform.
  • Stackable Design: The stackable extension component allows for flexible configuration and adaptability within compatible KSP 408 housing assemblies.
  • Drive Extension Included: The included drive extension ensures proper mechanical engagement between the SFIC core and the locking mechanism for reliable operation.
  • Commercial-Grade Construction: Built to the performance standards required for commercial door hardware applications, providing dependable service in high-demand environments.
  • Purpose-Built Replacement Part: Engineered as a direct replacement component for KSP 408 cylinder housing assemblies, maintaining system integrity and performance.
  • Hardware Included: All necessary screws are included, eliminating the need for additional fastener sourcing and simplifying the extension process.

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

Typical Applications

  • Commercial Office Buildings Requiring SFIC Cylinder Housing Extensions
  • Educational Facilities with KSP 408-Based Locking Systems
  • Healthcare Institutions Utilizing SFIC Keying Platforms
  • Government and Municipal Buildings with Interchangeable Core Systems
  • Retail Establishments Maintaining KSP 408 Cylinder Hardware
  • Multi-Tenant Residential and Mixed-Use Properties with Commercial Lock Cores
  • Industrial and Warehouse Facilities Using KSP Cylinder Housing Assemblies

Why KSP 408EXT-S-1?

KSP cylinder parts and accessories are engineered to maintain the integrity and performance of KSP 408 housing systems in commercial applications. The 408EXT-S-1 delivers a complete, purpose-built extension solution — stackable extension, drive extension, and screws included — ensuring that SFIC cylinder housing configurations can be adapted and maintained without compromising system reliability. For facilities and contractors dependent on KSP 408 platform hardware, this replacement part provides a direct, confidence-inspiring fit.

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:
Cylinder Housing
Parts and Accessories Type:
Replacement Parts
Commercial/Residential:
Commercial
Product Model:
408EXT-S-1
Features:
KSP Cylinder Parts & Accessories

KSP 408EXT-S-5 – Frequently Asked Questions

1) What does the KSP 408EXT-S-1 extension kit actually include?
Three things come in the 408EXT-S-1 kit: a stackable extension, a drive extension, and the mounting screws. The drive extension is what carries the turning motion from the SFIC core back to the lock mechanism once the core sits farther out, and the screws are included so you are not hunting fasteners on the job.
2) What extension lengths does the KSP 408EXT-S-1 come in?
Four lengths: 1/2 inch, 3/4 inch, 1 inch, and 2 inch. Pick the one that makes up the gap between the 408 housing and the face of the door or trim so the core sits flush.
3) Will the 408EXT-S-1 fit any SFIC housing, or only KSP 408?
Only KSP 408 housings. The 408EXT-S-1 is built as a purpose-made replacement and extension component for the KSP 408 cylinder housing platform, so it should not be ordered as a generic SFIC spacer for another maker's housing.
4) Is the KSP 408EXT-S-1 an alternative to a Kaba Ilco R2800 small format IC housing?
No - they solve different problems. The KSP 408EXT-S-1 is an extension kit for KSP 408 cylinder housings, supplying a stackable extension, a drive extension and the screws so an existing 408 housing can be lengthened. The Kaba Ilco R2800 Series is a small format interchangeable core convertible housing, meaning it is the housing itself rather than a part that adds length to one. If the 408 housing is already in the door and only needs more depth, the 408EXT-S-1 is the extension; if the housing is being supplied new, a complete SFIC housing such as the R2800 is the item.
5) Can I stack two extensions to get a thicker build-up?
Yes, the extension component is stackable, so extensions can be combined within a compatible KSP 408 housing assembly when one length alone does not reach. Bear in mind the drive extension has to keep engaging the core to the lock mechanism, so build up only as far as your housing assembly supports.
6) Do I need a new core or key when I add a 408 housing extension?
No. The extension only moves the core position out and passes the turn through with the included drive extension, so your existing small format interchangeable core and keying stay as they are. That is the point of the part, keeping the keying system intact while adapting the housing depth.
7) I need more cylinder depth on a KSP 408 - do I replace the whole housing or add an extension?
Either route works, and the choice is usually about how much of the assembly you want to disturb. The 408EXT-S-1 adds length to the housing already installed and comes in 1/2 inch, 3/4 inch, 1 inch and 2 inch extensions, with the drive extension and screws in the kit so no separate fasteners are needed. Replacing the housing outright means ordering a complete SFIC housing such as the Kaba Ilco R2800 Series convertible housing instead. Extending keeps the 408 platform intact; swapping housings changes the part line the facility standardizes on.
8) Is this a commercial part or something for residential doors?
Commercial. KSP lists the 408EXT-S-1 as commercial door hardware, and it is used where SFIC keying platforms already exist: offices, schools, hospitals, government buildings, retail, multi-tenant residential with commercial cores, and warehouses.
How fast can I get the KSP 408EXT-S-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-S-5 come with a warranty?
Absolutely. The KSP 408EXT-S-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-S-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-S-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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