Adams Rite S266-10R05N603 #10-...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$24.27
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Adams Rite S266-10R05N603 #10-32 x 5/16 Flat Head Screw for MS1850 Series Mortise Lock

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Model: S266-10R05N603

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

$24.27
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Adams Rite S266-10R05N603 #10-32 x 5/16 Flat Head Screw for MS1850 Series Mortise Lock

The Adams Rite S266-10R05N603 is a genuine OEM replacement #10-32 x 5/16 flat head screw designed specifically for use with the Adams Rite MS1850 Series mortise lock. As a precision-threaded installation accessory, this screw pack ensures a secure, factory-spec fit for commercial door hardware maintenance, repair, and replacement applications. Sourced directly from Adams Rite, this component maintains the integrity and performance of the MS1850 Series lock assembly.

Key Features

  • Precise Thread Specification: #10-32 x 5/16 threading provides an exact factory-spec fit for secure, reliable fastening within the MS1850 Series mortise lock assembly.
  • OEM Compatibility: Engineered specifically for the Adams Rite MS1850 Series, ensuring proper alignment and retention of lock components without modification.
  • Flat Head Design: Low-profile flat head geometry allows the screw to seat flush, maintaining a clean installation profile consistent with the original hardware configuration.
  • Genuine Adams Rite Component: Authentic Adams Rite part ensures full compatibility and adherence to original manufacturer tolerances for the MS1850 Series.
  • Commercial-Grade Application: Designed for commercial door hardware use, supporting the demanding performance requirements of the MS1850 Series mortise lock in high-traffic environments.
  • Installation Accessory: Classified as an installation accessory within the Adams Rite parts and accessories ecosystem, simplifying ordering for maintenance 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: Screw Pack
  • Parts and Accessories Type: Installation Accessories
  • Commercial/Residential: Commercial
  • Product Model: S266-10R05N603
  • Features: Adams Rite Parts

Typical Applications

  • MS1850 Series Mortise Lock Repair and Maintenance
  • Commercial Office Building Door Hardware Service
  • Educational Facility Lock Component Replacement
  • Healthcare Institution Hardware Maintenance
  • Retail and Storefront Door Lock Servicing
  • Government and Municipal Building Maintenance Programs
  • Industrial Facility Door Hardware Repair

Why Adams Rite S266?

Adams Rite parts and accessories are manufactured to exact OEM tolerances, ensuring that replacement components like the S266-10R05N603 flat head screw restore the MS1850 Series mortise lock to full factory specification. Designed for commercial-grade applications, Adams Rite genuine parts support the long-term reliability and performance that building owners and service professionals depend on for high-traffic door hardware installations.

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:
S266-10R05N603
Features:
Adams Rite Parts

Adams Rite S266-10R05N603 – Frequently Asked Questions

1) What thread size is the Adams Rite S266 screw, and can I substitute a hardware-store machine screw?
The thread is #10-32 with a 5/16 inch length under a flat head. A generic #10-32 in that length will thread, but the flat head geometry here is what lets the screw seat flush in the MS1850 prep; a pan or round head sits proud and can interfere with the lock case or faceplate. For an OEM-spec repair, use the Adams Rite part.
2) Is the Corbin Russwin 425F86-8 flat screw a substitute for the Adams Rite S266-10R05N603?
No. The Adams Rite S266-10R05N603 is a #10-32 x 5/16 flat head screw made for the Adams Rite MS1850 Series mortise lock, so its thread and length match that lock body. The Corbin Russwin 425F86-8 is a flat screw for the ML2000 mortise lock in 8-32 x 3/8, a different thread diameter and length in a different lock platform. A smaller 8-32 screw will not engage #10-32 tapped holes, so for MS1850 service keep the Adams Rite part and use the Corbin Russwin screw only on ML2000 hardware.
3) Is this an individual screw or a pack of screws?
Adams Rite catalogues the S266-10R05N603 as a screw pack for MS1850 Series service work, supplied as an installation accessory for the lock rather than as loose bulk fastener stock.
4) Do I need to modify anything to install the S266 screw in an MS1850 lock?
No drilling or tapping. It's built to the original Adams Rite tolerances for the MS1850, so it threads into the existing prep and holds the lock components in alignment as the factory screw did. Straight swap during a repair.
5) I need a strike screw, not a lock body screw - is the Adams Rite S266-10R05N603 the right part?
No. The Adams Rite S266-10R05N603 is a #10-32 x 5/16 flat head screw for the MS1850 Series mortise lock assembly, where the flat head seats flush in the lock hardware. For strike fastening on Corbin Russwin ML2000 openings, the 206F57-8 is the strike combo screw. Match the fastener to the component being secured rather than assuming a common thread across both.
6) For a facility standardizing on one mortise lock platform, how do Adams Rite and Corbin Russwin fastener parts differ?
They are platform specific, so standardizing the lock standardizes the fastener. Adams Rite supplies the S266-10R05N603 flat head screw as a commercial installation accessory for the MS1850 Series. Corbin Russwin supplies its own set for the ML2000 family, including the 206F57-8 strike combo screw, the 425F86-8 flat screw, and escutcheon screw packs such as 429F31 and 433F77. Stocking fasteners from one platform keeps service kits consistent, since parts from the two platforms are not interchangeable.
How fast can I get the Adams Rite S266-10R05N603 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 Adams Rite S266-10R05N603 come with a warranty?
Absolutely. The Adams Rite S266-10R05N603 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 Adams Rite S266-10R05N603?
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 Adams Rite S266-10R05N603 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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