Sargent F1-4270 Series UL437 L...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$340.76
Sargent F1-4270 Series UL437 Listed Security Mortise Lock Cylinders

Sargent F1-4270 Series UL437 Listed Security Mortise Lock Cylinders

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Model: SGT-F1-4270
From the Keso F1 Key System Collection
$340.76
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$340.76
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Sargent KESO F1-4270 UL437 Listed High-Security Mortise Lock Cylinder

Professional UL437 Listed Security Cylinder Solution

The Sargent KESO F1-4270 Series cylinder delivers UL437 Listed security performance with enhanced pick and drill resistance for high-security mortise lock applications. Features hardened steel pins and advanced tumbler design with ten-minute attack resistance under standardized UL testing protocols. Listed in the Underwriters Laboratories Burglary Protection Equipment directory under locking cylinders (241 012) for verified security credentials and professional-grade protection against picking, drilling, and forced entry attempts.

Professional Features & Benefits

  • UL437 Listed Security Performance: Underwriters Laboratories Burglary Protection Equipment List certification under locking cylinders (241 012) for verified ten-minute attack resistance.
  • Enhanced Pick Resistance: Advanced tumbler design resists aligning tumblers and opening the lock by means of picking tools for superior security protection.
  • Drill Resistant Construction: Hardened steel pins and reinforced cylinder body resist drilling the plug or cylinder body to prevent unauthorized access attempts.
  • Forced Entry Protection: Cylinder design resists opening by forcing tools into the key slot and applying rotary force with pliers or wrenches.
  • Ten-Minute Attack Resistance: UL performance testing verifies resistance to picking, drilling, and forced entry attempts for at least ten minutes under standardized protocols.
  • Multiple Finish Options: Available in finishes 03, 04, 09, 10, 10B, 10BE, 10BL, 14, 15, 20D, 32, 32D, BSP, and WSP for architectural coordination requirements.
  • System Compatibility: Can be keyed into total security systems when requirements are established at system design phase for integrated access control.
  • Mortise Lock Integration: Designed specifically for mortise lock applications with professional-grade security performance and reliable operation.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Installation & Operation

  1. Review manufacturer specifications and verify door preparation requirements including door thickness, stile width, and handing as applicable to this product.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and/or frame surfaces.
  3. Prepare door and frame by drilling required holes and routing as specified in manufacturer instructions.
  4. Install all mounting hardware and secure the device to door and frame per manufacturer torque specifications.
  5. Adjust operational components for proper alignment, latching, and smooth operation throughout the full range of motion.
  6. Test device operation to verify proper function and make final adjustments as needed. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

  • High-Security Commercial Buildings
  • Government and Municipal Facilities
  • Financial Institution Security
  • Healthcare Facility Restricted Areas
  • Educational Institution Administrative Zones
  • Industrial Facility Secure Storage
  • Multi-Tenant Residential Security Systems

Why Choose Sargent Quality?

Sargent KESO F1-4270 Series cylinders deliver professional-grade security with UL437 Listed performance and hardened steel pin construction rated for ten-minute attack resistance. Listed in the Underwriters Laboratories Burglary Protection Equipment directory under locking cylinders for verified security credentials. Engineered for demanding high-security applications where dependable protection against picking, drilling, and forced entry is essential.

Product Specs

Product Type:
Cylinders
Product Group:
Mechanical Locks
Product Subgroup:
Parts and Accessories
Subcategory:
Parts and Accessories
Commercial/Residential:
Commercial
Collection:
Keso F1 Key System
Series:
F1-4270 Series
Parts and Accessories Type:
Replacement Parts
Product Attribute:
Parts and Accessories
Product Category:
Mechanical Locks
Department:
Door Hardware

Sargent SGT-F1-4270 – Frequently Asked Questions

1) What cylinder length do I need for my mortise lock, and what sizes does the Sargent KESO F1-4270 come in?
The KESO F1-4270 mortise cylinder is offered in 1-1/8, 1-1/4, 1-3/8, 1-1/2 and 1-3/4 inch lengths. Measure the existing cylinder from the face of the collar to the back of the housing, or take the length off the mortise lock's cylinder prep. Thicker doors and heavier trim usually push you to the longer 1-1/2 or 1-3/4 inch sizes; a cylinder that sits proud of the trim is a pick point, and one that sits too deep won't reach the cam.
2) Is the Sargent KESO F1-4270 actually UL listed, or just "high security"?
It is UL437 Listed and carries a listing in the Underwriters Laboratories Burglary Protection Equipment directory under locking cylinders (241 012). UL437 testing verifies the cylinder resists picking, drilling and forced entry for at least ten minutes. If your spec calls for a UL437 cylinder by name, this one meets it on paper, which is what most government, financial and healthcare security specs are asking for.
3) Can these cylinders be keyed alike across a building, or keyed different per door?
Both. Keying is a required selection when ordering: standard keying, KD (keyed different) or KA (keyed alike). Property managers standardizing a floor or a tenant suite take KA; individual tenant doors take KD. The KESO F1 is a restricted key system, so the cylinders can be keyed into a total security system, but that has to be established when the system is designed, not added later.
4) Will this replace the standard cylinder in a mortise lock I already have installed?
The F1-4270 is a mortise cylinder built as a replacement part for mortise lock bodies, so it swaps into an existing mortise cylinder prep in the correct length. What it does not do is change the lock function. You are upgrading the key system and the attack resistance only; the latch, deadbolt and trim stay as they are. Match the length to what comes out and confirm the cam on the new cylinder drives your lock body.
5) What finishes can I get the KESO F1-4270 cylinder in to match my existing door hardware?
Fourteen finishes: 03 bright brass, 04 satin brass, 09 bright bronze, 10 satin bronze, 10B dark oxidized satin bronze oil rubbed, 10BE, 10BL, 14 bright nickel, 15 satin nickel, 20D dark statuary bronze, 32 bright stainless, 32D satin stainless, plus BSP black suede powder coat and WSP white suede powder coat. For most commercial openings 26D-style satin trim pairs with 32D; oil rubbed bronze trim takes 10B.
6) What does the ten-minute UL437 rating actually protect against on a mortise cylinder?
Three specific attacks. Picking, where the tumbler design resists aligning the pins with picking tools. Drilling, resisted by hardened steel pins and a reinforced cylinder body that stop a bit from taking out the plug or the shell. And torque attack, where someone forces a tool into the keyway and twists with pliers or a wrench. UL verifies the cylinder holds against all three for at least ten minutes.
7) Is a KESO F1 cylinder overkill for a standard office door, or when is it worth it?
For an ordinary interior office door on a standard keyway, it is more cylinder than the opening needs. Where it earns its place is anywhere key control matters as much as attack resistance: cash handling and financial areas, pharmacy and other restricted healthcare rooms, school administrative zones, secure storage, and main entries on multi-tenant residential. If the concern is someone copying a key rather than drilling the lock, the restricted KESO F1 system is the reason to buy it.
8) Is the Sargent F1-4270 a commercial cylinder or is it suitable for residential use?
It is a commercial-rated cylinder. It will physically work on a residential mortise lock, but the cost and the restricted-key administration only make sense where you are running a managed key system. Single-family homes are better served by a standard commercial mortise cylinder in the same length.
How fast can I get the Sargent SGT-F1-4270 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 Sargent SGT-F1-4270 come with a warranty?
Absolutely. The Sargent SGT-F1-4270 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 Sargent SGT-F1-4270?
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 Sargent SGT-F1-4270 from ZenSupply?
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