Schlage N523-135 Button Head H...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$17.06
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Schlage N523-135 Button Head Hex Socket Drive Request To Exit Harness Screw, #2-56 x 3/8", For ND Series

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Model: N523-135

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

$17.06
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Schlage N523-135 Button Head Hex Socket Drive Request To Exit Harness Screw, #2-56 x 3/8", For ND Series

The Schlage N523-135 is a Button Head Hex Socket Drive Request To Exit (REX) Harness Screw designed specifically for use with the Schlage ND Series locksets. This precision commercial-grade screw features a #2-56 thread size and a 3/8" length, providing a secure and reliable fastening solution for REX harness assemblies in commercial door hardware installations. Engineered to Schlage's exacting standards, this replacement screw ensures proper fit and performance within ND Series components.

Key Features

  • Precise Thread Specification: #2-56 thread size and 3/8" length ensure an exact fit within compatible ND Series harness assemblies for secure, rattle-free installation.
  • Button Head Hex Socket Drive: Low-profile button head design with hex socket drive allows for controlled torque application and a clean, flush-mounted finish.
  • ND Series Compatibility: Designed specifically for use with Schlage ND Series locksets, ensuring OEM-level fit and function for REX harness configurations.
  • Commercial-Grade Construction: Built to Schlage's commercial standards for Parts and Accessories, delivering consistent performance in demanding commercial environments.
  • Genuine Schlage Part: An authentic Schlage replacement component, ensuring compatibility and quality consistent with original factory specifications.
  • Installation Accessory: Classified as an Installation Accessory, this screw is essential for proper assembly and secure mounting of Request To Exit harness components.

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: Screw Pack
  • Parts and Accessories Type: Installation Accessories
  • Commercial/Residential: Commercial
  • Product Model: N523-135
  • Features: Schlage Parts

Typical Applications

  • Commercial Office Buildings with ND Series Locksets
  • Educational Facilities Requiring REX Harness Maintenance
  • Healthcare Institutions Using Schlage ND Series Hardware
  • Retail Establishments with Access Control Integrations
  • Government and Municipal Buildings with ND Series Installations
  • Industrial and Warehouse Facilities Requiring Parts Replacement
  • Multi-Tenant Residential and Mixed-Use Properties

Why Schlage N523?

Schlage Parts and Accessories are engineered to the same exacting standards as Schlage's complete lockset products, ensuring seamless compatibility and reliable performance within ND Series assemblies. The N523-135 screw provides facilities managers and installers with a genuine OEM replacement component, eliminating guesswork and ensuring the integrity of REX harness configurations in commercial door hardware applications.

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:
Screw Pack
Parts and Accessories Type:
Installation Accessories
Commercial/Residential:
Commercial
Product Model:
N523-135
Features:
Schlage Parts

Schlage N523-135 – Frequently Asked Questions

1) What size is the Schlage N523-135 REX harness screw?
The N523-135 is a #2-56 thread, 3/8 inch long button head screw with a hex socket drive. That thread is machine-screw sized, not a wood or self-tapping screw, so it threads into the tapped holes in the ND Series REX harness assembly. The low button head sits close to flush once driven.
2) Will the Schlage N523-135 screw work on Schlage locks other than the ND Series?
It is specified for Schlage ND Series locksets and their request-to-exit harness assemblies. If you are working on an L Series mortise, an AL or B Series, or another family, the N523-135 is not the part for it - order the screw pack called out for that series instead.
3) Can I use a Corbin Russwin ML2000 screw pack instead of the Schlage N523-135 REX harness screw?
No. The Schlage N523-135 is a #2-56 x 3/8 inch button head hex socket drive Request to Exit harness screw made specifically for Schlage ND Series locksets, so its thread size and length are matched to the ND REX harness assembly. The Corbin Russwin 429F31 screw packet is built for the ML2000 N escutcheon, and the 433F77 packet is for ML2000 M and P escutcheons. Those are different lock families and different mounting points, so neither one substitutes for an ND Series REX harness screw.
4) Is the Corbin Russwin 425F86-8 flat screw the same size as the Schlage N523-135?
They share the 3/8 inch length but not the thread or the head. The Corbin Russwin 425F86-8 is an 8-32 x 3/8 inch flat screw for ML2000 locks, while the Schlage N523-135 is a #2-56 x 3/8 inch button head with a hex socket drive for ND Series REX harness assemblies. An 8-32 thread will not enter a #2-56 tapped hole, so the two are not interchangeable despite the matching length.
5) What does a REX harness screw actually do in a Schlage ND lockset?
Request-to-exit hardware inside an ND Series lever lock signals an access control system that someone turned the inside lever to leave. The harness that carries that signal has to be fastened in place inside the chassis, and the N523-135 is the fastener that does it. If you pulled a lock apart for access control service and lost the small button head screw, this is the replacement.
6) What driver do I need for the Schlage N523-135 screw?
A hex key. The head is a button head with a hex socket drive, so no Phillips or Torx bit will seat in it. At a #2-56 thread the socket is very small, so bring a precision hex set to the door rather than a standard allen wrench roll.
7) I need screws for a Corbin Russwin mortise lock, not a Schlage ND. What should I order instead?
The N523-135 is a Schlage-only part and will not serve a Corbin Russwin ML2000 mortise lock. For that family, look at the Corbin Russwin 429F31 screw packet for the N escutcheon, the 433F77 screw pack for M and P escutcheons, the 425F86-8 flat screw in 8-32 x 3/8 inch, or the 206F57-8 strike combo screw, depending on which part of the lock you are fastening.
8) I need a screw for a mortise lock strike, not a REX harness. What should I order instead of the Schlage N523-135?
The N523-135 is a Request to Exit harness screw for Schlage ND Series locksets and is not a strike fastener. For a Corbin Russwin ML2000 mortise lock strike, the Corbin Russwin 206F57-8 is a Grade 1 strike combo screw made for that application. Match the screw to the lock family you actually have on the door.
9) Is the Schlage N523-135 a genuine Schlage part or an aftermarket screw?
It is a genuine Schlage component, model N523-135, built to factory spec for ND Series assemblies. For a fastener carrying a REX harness inside a commercial-rated lock, OEM matters: a substitute at the wrong length can bottom out or protrude into the chassis.
10) Is the N523-135 screw rated for commercial door hardware use?
Yes, it is a commercial-grade part, catalogued under Schlage's commercial mechanical lock components rather than residential hardware. It is the kind of item stocked for maintenance on office, school, healthcare and municipal openings running ND Series locks with access control.
11) What is the difference between ordering a single screw like the Schlage N523-135 and a screw pack such as the Corbin Russwin 433F77?
The Schlage N523-135 covers one specific fastener, a #2-56 x 3/8 inch button head hex socket REX harness screw for ND Series locksets, so you order it when you know exactly which screw went missing. The Corbin Russwin 433F77 and 429F31 are supplied as screw packs for ML2000 escutcheons, which is the format to use when you want the full set of escutcheon fasteners for a rebuild rather than one replacement piece.
How fast can I get the Schlage N523-135 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 N523-135 come with a warranty?
Absolutely. The Schlage N523-135 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 N523-135?
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 N523-135 from ZenSupply?
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