Master Lock 6621-0450 Retainer...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$9.67
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Master Lock 6621-0450 Retainer Screw for Series 6600, 6700 and No. 6852 Locks

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Model: 6621-0450

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

$9.67
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Master Lock 6621-0450 Retainer Screw for Series 6600, 6700 and No. 6852 Locks

The Master Lock 6621-0450 is a genuine OEM replacement retainer screw designed specifically for use with Master Lock Series 6600 and 6700 locks, as well as the No. 6852 lock model. As a purpose-built service part, this retainer screw ensures proper assembly integrity and continued reliable operation of compatible Master Lock commercial mechanical locks. Sourced directly from the manufacturer, this component is the correct replacement to maintain the performance and safety standards of your existing hardware.

Key Features

  • Genuine OEM Compatibility: Engineered specifically for Master Lock Series 6600 and 6700 locks and No. 6852 lock models, ensuring a precise fit and reliable function.
  • Service Parts Classification: Categorized as a service part within the Cylinders and Keys accessory group, supporting field service and maintenance needs.
  • Commercial-Grade Construction: Designed for commercial applications, meeting the durability and performance standards expected of professional-grade door hardware.
  • Installation Accessory: Functions as an installation accessory to facilitate proper assembly and secure retention of lock components during service or replacement procedures.
  • Screw Pack Format: Supplied as a screw pack for convenient handling and installation in the field or during in-shop service operations.

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: 6621-0450
  • Features: Service Parts/Cylinders and Keys

Typical Applications

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

Why Master Lock 6621-0450?

Master Lock service parts are manufactured to the same exacting standards as the original hardware, providing a reliable solution for maintaining the integrity and performance of Series 6600, 6700, and No. 6852 commercial mechanical locks. Choosing a genuine OEM retainer screw ensures component compatibility and upholds the safety and function of your installed hardware 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:
Screw Pack
Parts and Accessories Type:
Installation Accessories
Commercial/Residential:
Commercial
Product Model:
6621-0450
Features:
Service Parts/Cylinders and Keys

Master Lock 6621-0450 – Frequently Asked Questions

1) Can a Corbin Russwin ML2000 screw pack be used in place of the Master Lock 6621-0450 retainer screw?
No. The Master Lock 6621-0450 is a retainer screw made specifically for Master Lock Series 6600 and 6700 locks and the No. 6852 lock, so it is matched to that hardware rather than to a mortise lock body. The Corbin Russwin 429F31 screw packet is built for the ML2000 N escutcheon, and the Corbin Russwin 433F77 is a screw pack for the ML2000 M and P escutcheons. Those are escutcheon fastener sets for the ML2000 mortise line and will not serve as a retainer screw in a Master Lock 6600, 6700 or 6852.
2) What does the retainer screw actually do inside a Master Lock 6600 or 6700 lock?
It holds lock components in place during assembly, so the lock stays together and operates properly after service. Master Lock classifies it as an installation accessory in the service parts and cylinders/keys group, which is where the retainer screw sits in a maintenance kit.
3) My strike plate screws stripped out - is the Master Lock 6621-0450 the right part?
No. The 6621-0450 is a retainer screw that holds lock components together during assembly on Master Lock Series 6600, 6700 and No. 6852 locks, not a strike fastener. For a strike on a Corbin Russwin ML2000 mortise lock, the Corbin Russwin 206F57-8 is the strike combo screw for that lock. Match the part to both the function you are replacing and the lock line in the door.
4) I need a single fastener rather than a screw pack for a mortise lock - what are my options?
The Master Lock 6621-0450 is supplied as a screw pack for Master Lock Series 6600, 6700 and No. 6852 locks. If the opening uses a Corbin Russwin ML2000 mortise lock instead, individual fasteners are made for it: the Corbin Russwin 425F86-8 is a flat screw in 8-32 x 3/8 inch, and the Corbin Russwin 206F57-8 is a strike combo screw for the ML2000. Choose by the lock brand and line already in the door, since these fasteners are not interchangeable between the Master Lock and Corbin Russwin platforms.
5) Is this screw suitable for commercial buildings or is it a residential part?
It is a commercial-duty service part. Master Lock lists the 6621-0450 as commercial door hardware, and the 6600/6700 locks it serves are used in offices, schools, healthcare, retail, warehouses, multi-tenant residential and government buildings.
How fast can I get the Master Lock 6621-0450 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 6621-0450 come with a warranty?
Absolutely. The Master Lock 6621-0450 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 6621-0450?
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 6621-0450 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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