Master Lock 0001-0394 #4 Maste...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
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Master Lock 0001-0394 #4 Master Pin Yellow Rekeying Pin Refill for Commercial Cylinders

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Model: 0001-0394

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

$18.47
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Master Lock 0001-0394 #4 Master Pin Yellow Rekeying Pin Refill for Commercial Cylinders

The Master Lock 0001-0394 is a #4 Master Pin in Yellow, designed as a precision replacement part for rekeying and servicing commercial lock cylinders. Engineered to support professional locksmith and facilities maintenance operations, this pin refill ensures accurate key bitting alignment during cylinder rekeying procedures. Identified by its yellow color coding for quick size identification, this component is classified as a commercial-grade rekey part within the Master Lock service parts and cylinders program.

Key Features

  • Precision Pin Sizing: #4 master pin specification ensures accurate key bitting depth alignment for reliable cylinder operation after rekeying.
  • Color-Coded Identification: Yellow color coding allows for rapid visual identification during pin kit assembly and cylinder servicing, minimizing installation errors.
  • Commercial-Grade Quality: Designed and rated for commercial applications, meeting the durability demands of high-traffic and professionally managed facilities.
  • Cylinder Compatibility: Suitable for use with compatible Master Lock cylinder systems as part of the service parts and cylinders program.
  • Rekeying Application: Specifically engineered as a rekey part, supporting professional cylinder rekeying and master keying system configurations.
  • Replacement Part Convenience: Supplied as a direct replacement component, enabling field service and cylinder maintenance without full cylinder replacement.

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: Rekey Parts
  • Parts and Accessories Type: Replacement Parts
  • Commercial/Residential: Commercial
  • Product Model: 0001-0394
  • Features: Service Parts/Cylinders and Keys

Typical Applications

  • Commercial Office Building Lock Cylinder Rekeying
  • Educational Facility Master Key System Maintenance
  • Healthcare Institution Lock Servicing Programs
  • Retail Establishment Cylinder Replacement and Rekeying
  • Industrial and Warehouse Facility Security Maintenance
  • Multi-Tenant Residential Property Locksmith Services
  • Government and Municipal Building Key Control Programs

Why Master Lock 0001-0394?

Master Lock service parts are engineered to exact tolerances, ensuring reliable performance within compatible cylinder systems. The color-coded #4 master pin design supports efficient, error-resistant cylinder servicing for professional locksmiths and facilities management teams working in demanding commercial environments.

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:
Rekey Parts
Parts and Accessories Type:
Replacement Parts
Commercial/Residential:
Commercial
Product Model:
0001-0394
Features:
Service Parts/Cylinders and Keys

Master Lock 0001-0394 – Frequently Asked Questions

1) What is a #4 master pin actually used for when rekeying a cylinder?
A master pin is a short spacer pin that sits between the bottom pin and the top driver pin so a cylinder will accept both a change key and a master key. The Master Lock 0001-0394 is the #4 size in that progression, used when setting up or re-pinning a master keyed cylinder. If you are simply rekeying a single cylinder to one key, you do not need master pins at all, only bottom pins.
2) Will the Master Lock 0001-0394 pin work in a Schlage or Kwikset cylinder?
It is a Master Lock service part, supplied for use in compatible Master Lock cylinder systems. Pin diameters and depth increments differ between manufacturers, so for Schlage or Kwikset cylinders you want pins sized to that keyway's increment rather than a Master Lock pin.
3) Is this pin rated for commercial lock work or is it a homeowner part?
Master Lock classes the 0001-0394 as a commercial service part, sold under its service parts and cylinders program for professional locksmith and facility maintenance rekeying. It is a loose component, not a consumer rekey kit with a key and instructions.
4) For a school or hospital master key system, do I only need #4 master pins?
No. A master key system needs a range of master pin sizes plus bottom and top pins, because each cylinder's combination determines which increments you use. The 0001-0394 covers the #4 size only, so stock it alongside the other sizes in the progression rather than on its own. It is the refill you reach for when one size in your kit runs dry.
5) Can I rekey a Master Lock cylinder with these pins without buying a whole new cylinder?
Yes, that is what the part exists for. Swapping pins re-combinates the existing cylinder in place, so a property manager or in-house maintenance tech can change keying on a door without pulling and replacing the lock body. You will need a plug follower, tweezers or a pinning tray, and the correct bottom pins for the new key.
6) Why is the Master Lock #4 master pin yellow?
The yellow is size coding, not a finish. On a pin tray or a bench full of loose pins the color is how you pick the #4 out without gauging it, which is the point when you are pinning a stack of cylinders for a master key system. Order by the number, use the color to verify at the bench.
How fast can I get the Master Lock 0001-0394 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 Master Lock 0001-0394 come with a warranty?
Absolutely. The Master Lock 0001-0394 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 Master Lock 0001-0394?
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 Master Lock 0001-0394 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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