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Schlage C503-331 Plunger Spring for ND Series Levers
The Schlage C503-331 is a genuine OEM replacement plunger spring designed specifically for use with Schlage ND Series levers. This commercial-grade replacement part ensures continued reliable operation of ND Series lever hardware by restoring proper spring tension to the plunger mechanism. Engineered to Schlage's exacting standards, the C503-331 is a precision component belonging to the Rings, Spindles and Springs product family and is an essential service part for maintaining ND Series door hardware in commercial environments.
Key Features
- Genuine Schlage Replacement Part: Authentic OEM component manufactured to Schlage's specifications, ensuring proper fit and function within ND Series lever assemblies.
- ND Series Compatibility: Designed specifically for use with Schlage ND Series levers, making it the correct choice for servicing this widely installed commercial lever line.
- Precision Spring Component: Functions as the plunger spring within the lever mechanism, restoring proper tension and ensuring smooth, consistent lever return action.
- Commercial-Grade Quality: Rated for commercial applications, this replacement part meets the demands of high-traffic door hardware installations.
- Direct Drop-In Replacement: Engineered as a direct replacement component, minimizing service time and eliminating the need for custom fitting or modification.
- Part of Schlage Parts Ecosystem: Sourced from Schlage's genuine parts program, ensuring compatibility and quality assurance for professional installers and service technicians.
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: Rings, Spindles and Springs
- Parts and Accessories Type: Replacement Parts
- Commercial/Residential: Commercial
- Product Model: C503-331
- Features: Schlage Parts
Typical Applications
- Commercial Office Buildings with Schlage ND Series lever hardware
- Educational Facilities servicing existing ND Series installations
- Healthcare Institutions maintaining commercial door hardware
- Retail Establishments requiring lever mechanism repair
- Industrial and Warehouse Facilities with ND Series levers
- Government and Municipal Buildings using Schlage ND Series hardware
- Multi-Tenant Residential Properties with commercial-grade lever hardware
Why Schlage C503-331?
Schlage genuine replacement parts like the C503-331 Plunger Spring are manufactured to the same standards as original production components, ensuring reliable performance and proper fit within ND Series lever assemblies. Choosing an authentic Schlage part eliminates compatibility concerns and supports the long-term performance of installed commercial door hardware. For professional service technicians and facilities managers, the C503-331 is the dependable, manufacturer-approved solution for restoring ND Series lever function.
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:
- Rings, Spindles and Springs
- Parts and Accessories Type:
- Replacement Parts
- Commercial/Residential:
- Commercial
- Product Model:
- C503-331
- Features:
- Schlage Parts
Schlage C503-331 – Frequently Asked Questions
1) What does the Schlage C503-331 plunger spring actually do inside an ND Series lever?
The C503-331 is the plunger spring inside Schlage ND Series lever hardware. It supplies the tension that returns the lever to horizontal after it is released. When it weakens or breaks, the lever sags or stops springing back cleanly, and replacing the spring restores that return action without touching the rest of the lockset.
2) Will this Schlage spring fit lever lines other than ND Series?
No. The C503-331 is specified for Schlage ND Series levers only. It is not a universal spring, so if you are servicing an AL, L, or another Schlage line, order the service part called out for that series instead. Confirm the lock is an ND before you pull it apart.
3) My ND lever is drooping. Do I need a whole new lockset or just a spring?
A drooping or slow-returning ND lever is usually a spring problem, not a lock problem. The C503-331 plunger spring restores the tension that brings the lever back up, so you can repair the existing lever in place instead of pulling and replacing the entire lockset. If the lever is loose on the spindle or the chassis itself is worn, that is a different part.
4) Will a Corbin Russwin swivel spindle pin work in place of a Schlage C503-331 plunger spring?
No. The Schlage C503-331 is a plunger spring for Schlage ND Series levers, a spring component that restores tension to the plunger mechanism inside the lever. The Corbin Russwin swivel spindle pin with set screw is a spindle retention part sized for 1-3/4 inch doors, not a spring, and it is built for Corbin Russwin lock chassis. If the ND lever is not returning properly, the C503-331 is the part that addresses that; the swivel spindle pin addresses spindle-to-lever retention in a different manufacturer's lockset.
5) Is the C503-331 a genuine Schlage OEM part or an aftermarket spring?
Genuine Schlage OEM. The C503-331 comes from Schlage's own parts program, made to the same specification as the spring installed in production ND Series levers, so it drops into the mechanism without filing, cutting, or shimming.
6) Is this spring rated for high-traffic commercial doors or is it a residential part?
Commercial. The C503-331 is classified as a commercial-grade replacement part, which matches where ND Series levers normally live: school corridors, hospitals, offices, retail, warehouses, and multi-tenant buildings. It is the correct service part for high-cycle openings rather than a light-duty residential substitute.
7) How do I order the right ND Series spring, and is the C503-331 a single part number or a range of options?
There is one part to order: model C503-331. No handing, finish, or size choice applies, because the spring sits inside the lever and is never seen. Just call out C503-331 for Schlage ND Series lever service.
8) I need a spindle pin or set screw, not a lever spring. What should I look at instead?
The C503-331 is only the plunger spring for Schlage ND levers, so it will not help with a spindle or set screw failure. For that repair, the Corbin Russwin Swivel Spindle Pin x Set Screw set covers spindle hardware and is listed for 1-3/4 inch doors. Match the part to the brand of lock you are servicing.
9) I have a mix of Schlage ND levers and Corbin Russwin locksets in my building - do I need separate spring and spindle service parts for each?
Yes, they are separate brand-specific service parts. The Schlage C503-331 is a genuine OEM plunger spring for ND Series levers and is a commercial replacement part. Corbin Russwin locksets use their own trim hardware, such as the swivel spindle pin with set screw for 1-3/4 inch doors. Stocking both means you can service either chassis without cross-fitting parts between manufacturers.
10) Should a facility stock the C503-331 as a maintenance item?
If your building runs Schlage ND Series levers, yes, this is a sensible shelf item. Lever springs are the most common wear point on a lever that otherwise still works, and having C503-331 on hand lets a maintenance tech fix a sagging lever the same day instead of ordering a complete lockset. It is catalogued by Schlage as a service part for exactly that purpose.
How fast can I get the Schlage C503-331 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 C503-331 come with a warranty?
Absolutely. The Schlage C503-331 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 C503-331?
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 C503-331 from ZenSupply?
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