Schlage C603-951 Primus Finger...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1.99
Schlage C603-951 Primus Finger Pin Spring and Everest Check Pin Spring Replacement Parts

Schlage C603-951 Primus Finger Pin Spring and Everest Check Pin Spring Replacement Parts

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Model: C603-951

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

$1.99
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Schlage C603-951 Primus Finger Pin Spring and Everest Check Pin Spring Replacement Parts

The Schlage C603-951 delivers genuine OEM replacement springs engineered for Schlage Primus and Everest cylinder systems. This commercial-grade parts kit includes both the Primus Finger Pin Spring and the Everest Check Pin Spring, ensuring your high-security locking cylinders maintain proper pin function and operational integrity. Designed specifically for commercial mechanical lock applications, these replacement components help restore factory-specification performance to Primus and Everest cylinder assemblies.

Key Features

  • Dual-Spring Kit: Includes both the Primus Finger Pin Spring and the Everest Check Pin Spring, covering two critical cylinder spring components in a single part number for convenient servicing.
  • Genuine Schlage Parts: Manufactured to Schlage OEM specifications, ensuring proper fit, function, and compatibility with Primus and Everest cylinder assemblies.
  • Primus System Compatibility: Designed for use with Schlage Primus high-security cylinders, which feature an additional sidebar locking element requiring precise spring tolerances.
  • Everest System Compatibility: Also compatible with Schlage Everest cylinder platforms, making this a versatile replacement part for locksmiths and facilities maintaining multiple Schlage cylinder types.
  • Commercial-Grade Quality: Rated for commercial applications where reliable cylinder performance and consistent pin stack operation are essential to security and access control.
  • Rings, Spindles and Springs Category: Classified under Schlage's Rings, Spindles and Springs product type, ensuring correct identification and ordering for service and repair workflows.

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: C603-951
  • Features: Schlage Parts

Typical Applications

  • Commercial Office Building Lock Cylinder Maintenance
  • Educational Facility Security Hardware Servicing
  • Healthcare Institution Access Control Upkeep
  • Government and Municipal Building Lock Repair
  • Locksmith and Door Hardware Service Technician Use
  • Industrial and Warehouse Facility Cylinder Restoration
  • Multi-Tenant Residential and Mixed-Use Property Maintenance

Why Schlage C603-951?

Schlage replacement parts like the C603-951 are manufactured to the same exacting standards as original factory components, ensuring that Primus and Everest cylinders continue to operate at peak performance after servicing. For commercial facilities and security professionals who depend on consistent, high-security cylinder function, genuine Schlage springs provide the precise tolerances required for reliable pin stack operation and long-term mechanical integrity.

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:
C603-951
Features:
Schlage Parts

Schlage C603-951 – Frequently Asked Questions

1) What exactly comes in the Schlage C603-951 spring part?
C603-951 is a two-spring service part: the Primus finger pin spring and the Everest check pin spring, both under one Schlage part number. It covers the two spring components a tech touches when rebuilding those cylinder types, so you are not ordering two separate line items to service a bench full of cylinders.
2) Will the C603-951 springs work in a standard Schlage C keyway cylinder, or only Primus and Everest?
These are specific to Schlage Primus and Everest cylinder platforms. The finger pin spring serves the Primus sidebar finger pins, and the check pin spring serves the Everest check pin; a conventional Schlage cylinder has neither of those elements, so C603-951 is not the spring set for a standard pin stack rebuild.
3) Can a Corbin Russwin swivel spindle pin and set screw be used in place of the Schlage C603-951 springs?
No. The Schlage C603-951 is a cylinder spring kit containing the Primus finger pin spring and the Everest check pin spring, both of which live inside the pin stack of a Schlage Primus or Everest cylinder. The Corbin Russwin 499F838 is a swivel spindle pin with a set screw, a knob and lever trim part for doors 1-3/4 inches thick. One keeps a high security cylinder pinning correctly; the other retains a spindle in the trim. They serve different parts of the lock and are not interchangeable.
4) Is this a genuine Schlage part or an aftermarket spring?
Genuine Schlage OEM, built to factory specification for Primus and Everest cylinder assemblies. That matters more on these two springs than on most hardware, because the Primus sidebar depends on tight spring tolerances to let the finger pins register correctly.
5) My Primus cylinder turns but the sidebar will not release. Is a finger pin spring the fix?
A weak or collapsed finger pin spring is one cause of that symptom, because the Primus sidebar only releases when the finger pins are held against the key's side milling. C603-951 supplies that finger pin spring as an OEM replacement to bring the pin stack back to factory function. If the cylinder still binds after the springs are replaced, the problem is elsewhere in the pin stack or the key.
6) I need a part to stop a lever from pulling off the spindle, not a cylinder repair. What should I order instead of the Schlage C603-951?
Order a spindle retaining part rather than a cylinder spring kit. The Corbin Russwin 499F838 swivel spindle pin with set screw is the trim-side part for that problem and is specified for 1-3/4 inch doors. The Schlage C603-951 is a replacement parts kit for Primus and Everest cylinder springs and does nothing for spindle or lever retention.
7) Is the C603-951 spring kit meant for commercial cylinders or residential locks?
Commercial. Schlage classifies C603-951 as a commercial mechanical lock part, which is where Primus and Everest cylinders live anyway: office buildings, schools, hospitals, government facilities, and multi-tenant properties running keyed systems.
How fast can I get the Schlage C603-951 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 C603-951 come with a warranty?
Absolutely. The Schlage C603-951 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 C603-951?
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 C603-951 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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