Schlage L583-321 Mounting Plat...
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$24.74
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Schlage L583-321 Mounting Plate for L Series Interior Knob

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Model: L583-321

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

$24.74
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Schlage L583-321 Mounting Plate for L Series Interior Knob

The Schlage L583-321 is a commercial-grade replacement mounting plate designed specifically for use with Schlage L Series interior knobs. Engineered as a precision-fit component, this mounting plate ensures secure and proper attachment of the interior knob assembly to the door, maintaining the integrity and performance of the L Series mortise lock system. Designed for commercial applications, this genuine Schlage part delivers the quality and dimensional accuracy required for reliable, long-term operation.

Key Features

  • Genuine Schlage Part: Manufactured to Schlage's exact specifications, ensuring proper fit and function within the L Series lock system.
  • L Series Compatibility: Designed specifically for use with Schlage L Series interior knob assemblies, providing a precise, purpose-built replacement solution.
  • Commercial-Grade Construction: Built to meet the demands of commercial door hardware applications where consistent performance and durability are essential.
  • Replacement Part: Serves as a direct replacement component, restoring full functionality to existing L Series mortise lock installations without the need for full hardware replacement.
  • Secure Mounting: Provides a stable mounting interface between the interior knob and door, supporting the structural integrity of the complete lock assembly.

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: Mounting Plates
  • Parts and Accessories Type: Replacement Parts
  • Commercial/Residential: Commercial
  • Product Model: L583-321
  • Features: Schlage Parts

Typical Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Government and Municipal Buildings
  • Retail Establishments
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties

Why Schlage L583-321?

The Schlage L583-321 Mounting Plate is a genuine OEM replacement component, engineered to the exact tolerances required by the Schlage L Series system. For facility managers and contractors seeking to restore or maintain commercial L Series mortise lock installations, this purpose-built part ensures reliable fit and sustained performance without compromise.

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:
Mounting Plates
Parts and Accessories Type:
Replacement Parts
Commercial/Residential:
Commercial
Product Model:
L583-321
Features:
Schlage Parts

Schlage L583-321 – Frequently Asked Questions

1) What exactly is the Schlage L583-321, and what part of the lock does it replace?
The L583-321 is the mounting plate that holds a Schlage L Series interior knob assembly to the door. It is the interface between the knob and the door face, not the lock body or the knob itself. If the knob is loose or the plate is bent or stripped, this is the piece you order, and you keep the existing mortise lock case in the door.
2) Will the L583-321 mounting plate work with a Schlage L Series lever instead of a knob?
No. The L583-321 is built specifically for L Series interior knob assemblies. A lever trim uses its own mounting parts, so if the inside trim on your door is a lever, this plate is the wrong part.
3) Do I have to replace the whole Schlage mortise lock if the interior knob mounting plate is damaged?
No. The L583-321 is sold as a replacement component, so you restore the interior knob mounting on an existing L Series mortise installation without pulling and replacing the complete lockset. That matters on a building standardized on L Series, where swapping full hardware on one door means matching finish and keying all over again.
4) Is the L583-321 a genuine Schlage part or an aftermarket copy?
It is a genuine Schlage OEM component made to Schlage's own specifications for the L Series system. For institutional buyers who have to keep a facility on one hardware standard, that keeps the repair inside the original manufacturer's parts chain rather than introducing a third-party fit.
5) Is the Schlage L583-321 mounting plate rated for commercial door traffic or is it a residential part?
Commercial. The plate is classified as commercial-grade and belongs to the Schlage L Series mortise family, which is commercial mortise hardware. It is used in office buildings, schools, healthcare facilities, government buildings, retail, industrial sites and multi-tenant residential.
6) I'm ordering parts for a Schlage L Series repair. Does the L583-321 come with a knob or any trim?
No. The order is the mounting plate alone. The interior knob, the escutcheon or rose, the spindle and the lock case are all separate items, so if the knob itself is worn or the wrong finish, add it to the order as its own line.
7) How do I know the L583-321 is the right mounting plate for my door before I order?
Pull the interior trim and confirm two things: the lock in the door is a Schlage L Series mortise case, and the inside trim is a knob rather than a lever. If both hold, the L583-321 is the plate that goes behind that knob. It is sold in one configuration, so there is no size, hand or finish selection to make on the order.
How fast can I get the Schlage L583-321 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 Schlage L583-321 come with a warranty?
Absolutely. The Schlage L583-321 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 Schlage L583-321?
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 Schlage L583-321 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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