Schlage B300-108 Cylinder Reta...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$17.90
Image coming soon

Schlage B300-108 Cylinder Retainer Screw for B/BA/F/FA 300 Series Locks

(No reviews yet) Write a Review

Model: B300-108

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

$17.90
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

Schlage B300-108 Cylinder Retainer Screw for B/BA/F/FA 300 Series Locks

The Schlage B300-108 is a genuine OEM Cylinder Retainer Screw engineered specifically for use with Schlage B, BA, F, and FA 300 Series locks. Designed as a precision replacement and installation accessory, this screw pack ensures proper cylinder retention and secure assembly in commercial-grade Schlage lock applications. Using genuine Schlage parts maintains the integrity and performance of your 300 Series hardware.

Key Features

  • Genuine Schlage OEM Part: Authentic Schlage replacement component designed and manufactured to exact specifications for reliable, long-lasting performance.
  • Broad Series Compatibility: Compatible with Schlage B, BA, F, and FA 300 Series lock cylinders, providing wide coverage across the 300 Series product line.
  • Secure Cylinder Retention: Purpose-built retainer screw ensures proper cylinder seating and retention, maintaining lock integrity and operational reliability.
  • Commercial-Grade Quality: Engineered for commercial door hardware applications where dependable fastening performance is essential.
  • Precision Fit: Manufactured to exact tolerances for correct fitment within compatible Schlage 300 Series lock assemblies, simplifying installation and service.
  • Convenient Screw Pack Format: Packaged as a screw pack for easy handling and installation by locksmiths, contractors, and facility maintenance professionals.

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: B300-108
  • Features: Schlage Parts

Typical Applications

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

Why Schlage B300-108?

Schlage genuine replacement parts like the B300-108 Cylinder Retainer Screw are manufactured to the same exacting standards as the original components, ensuring proper fit and function within compatible 300 Series lock assemblies. For commercial applications where lock integrity and security cannot be compromised, specifying authentic Schlage parts is the professional standard trusted by locksmiths and facility managers alike.

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:
B300-108
Features:
Schlage Parts

Schlage B300-108 – Frequently Asked Questions

1) What does the Schlage B300-108 screw actually do in the lock?
The B300-108 is the cylinder retainer screw. It holds the key cylinder seated in the lock body so the cylinder cannot back out or spin, which is what keeps the lock operating correctly after a rekey or cylinder swap. It is a genuine Schlage part sold as a screw pack, not a full cylinder or lock.
2) I lost the small screw holding the cylinder in my Schlage F300 series deadbolt. Is this the right replacement?
Yes, provided the lock is a Schlage 300 Series in the B, BA, F or FA families. The B300-108 is the OEM cylinder retainer screw for those assemblies and is made to the original tolerances, so it threads into the existing prep with no modification.
3) Is there a Corbin Russwin screw that replaces the Schlage B300-108 cylinder retainer screw?
No. The Schlage B300-108 is a cylinder retainer screw made for Schlage B, BA, F, and FA 300 Series locks, and it is a genuine Schlage part cut to those assemblies. Corbin Russwin screw packs such as the 429F31 screw packet and the 433F77 M and P escutcheon screw pack are built for the Corbin Russwin ML2000 mortise line, not for Schlage 300 Series cylinders. If the lock body is a Schlage 300 Series, use the B300-108; the ML2000 parts are for a different lock entirely.
4) Can I use a generic hardware store screw instead of the Schlage B300-108?
A substitute risks the wrong thread or length, which either fails to retain the cylinder or bottoms out and binds it. The B300-108 is the factory part machined for the 300 Series cylinder pocket, which is why locksmiths and facility crews keep it on the truck rather than guessing at a fastener.
5) Does ordering the B300-108 get me a cylinder or lock parts too?
No. What ships is the retainer screw pack only. If you also need the cylinder, keys, or trim for a 300 Series lock, those are separate line items and should be ordered alongside it.
6) We standardize a mixed building on Schlage and Corbin Russwin - can one screw pack cover both?
No single pack covers both platforms. The Schlage B300-108 is a commercial-grade installation accessory sold as a screw pack for Schlage B, BA, F, and FA 300 Series locks. The Corbin Russwin side needs its own parts by function: 429F31 or 433F77 escutcheon screw packs for ML2000 trim, 206F57-8 for strikes, and 425F86-8 as a flat screw. Stock the B300-108 for the Schlage openings and the matching Corbin Russwin parts for the ML2000 openings.
7) What is the difference between a cylinder retainer screw and a strike or flat screw?
They do different jobs in the lock. The Schlage B300-108 is a cylinder retainer screw - it holds the cylinder seated in a Schlage 300 Series lock so the cylinder cannot back out. By contrast, the Corbin Russwin 206F57-8 is a strike combo screw, used to fasten the strike in the frame, and the 425F86-8 is a flat screw in 8-32 x 3/8 inch. If the cylinder is loose or turning in the lock, the retainer screw is the part you want, not a strike or trim screw.
8) Is the B300-108 a commercial-grade part or a residential one?
It is classified as commercial door hardware, intended for 300 Series locks in service in offices, schools, healthcare, retail, warehouses, multi-tenant residential buildings and government facilities. The same screw works on a 300 Series lock in a residential setting, but it is specified as a commercial component.
9) Are there different sizes or finishes to choose from on the B300-108?
No options to specify. The B300-108 is a single configuration under one part number, so there is no finish, length or handing choice to make when ordering.
How fast can I get the Schlage B300-108 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 B300-108 come with a warranty?
Absolutely. The Schlage B300-108 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 B300-108?
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 B300-108 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.
!