Don-Jo CR-300 Closer Reinforce...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$20.10
$17.66
Don-Jo CR-300 Closer Reinforcement Plate, 14" x 3.77", 12 Gauge Steel

Don-Jo CR-300 Closer Reinforcement Plate, 14" x 3.77", 12 Gauge Steel

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Model: CR300

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

$20.10
$17.66
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Don-Jo CR-300 Closer Reinforcement Plate, 14" x 3.77", 12 Gauge Steel

The Don-Jo CR-300 Closer Reinforcement Plate is a heavy-duty commercial-grade door reinforcement solution engineered to provide a solid, secure mounting surface for door closers. Measuring 14" in length and 3.77" in width, this reinforcement plate is constructed from 12 gauge (.104) steel, delivering the structural integrity required for demanding commercial door applications. Designed for use in commercial environments, the CR-300 ensures that door closer hardware is properly supported, reducing the risk of pull-through and extending the service life of the door and closer assembly.

Key Features

  • Precise Dimensions: Measures 14" in length and 3.77" in width, providing ample coverage for standard commercial door closer mounting configurations.
  • Heavy-Duty 12 Gauge Steel Construction: Fabricated from 12 ga. (.104) steel for exceptional rigidity and resistance to deformation under load, ensuring long-term performance in high-traffic commercial settings.
  • Commercial-Grade Durability: Engineered specifically for commercial applications where structural reinforcement is critical to the reliable operation of door closer hardware.
  • Closer Reinforcement Function: Provides a reinforced backing plate that distributes mounting stress across a wider door surface area, protecting door integrity and preventing hardware pull-through.
  • Convenient Shelf Pack Quantity: Available in a shelf pack of 10 units, making it practical for contractors, distributors, and facility managers stocking hardware for multiple installations.
  • Door Trim and Accessories Category: Classified within the Filler Plates, Lock Adapters and Wrap Arounds subgroup, confirming compatibility with standard door trim and accessory applications.

Technical Specifications

  • Product Group: Door Trim and Accessories
  • Product Subgroup: Filler Plates, Lock Adapters and Wrap Arounds
  • Commercial/Residential: Commercial
  • Subcategory: Filler Plates, Lock Adapters and Wrap Arounds
  • Product Category: Door Trim and Accessories
  • Department: Door Hardware

Typical Applications

  • Commercial Office Buildings
  • Educational Facilities and Schools
  • Healthcare Institutions and Hospitals
  • Retail Establishments and Shopping Centers
  • Industrial and Warehouse Facilities
  • Government and Municipal Buildings
  • Multi-Tenant Residential and Mixed-Use Properties

Why Don-Jo CR-300?

Don-Jo closer reinforcement products are built to commercial standards, with the CR-300 featuring 12 gauge (.104) steel construction that delivers the structural strength needed to support door closer hardware in demanding, high-traffic environments. The 14" x 3.77" profile ensures broad surface coverage and reliable load distribution, making the CR-300 a dependable choice for professional installers and facility managers who require consistent, long-lasting performance from their door hardware reinforcement solutions.

Product Specs

Product Group:
Door Trim and Accessories
Product Subgroup:
Filler Plates, Lock Adapters and Wrap Arounds
Product Type:
Closer Reinforcement
Commercial/Residential:
Commercial
Subcategory:
Filler Plates, Lock Adapters and Wrap Arounds
Product Model:
CR 300
Product Category:
Door Trim and Accessories
Product Substrate:
Steel
Department:
Door Hardware

Don-Jo CR300 – Frequently Asked Questions

1) What does a Don-Jo CR-300 closer reinforcement plate actually do on a door?
The CR-300 is a backing plate that goes behind a door closer to spread the mounting load across a wider area of the door face. On hollow metal or thinner-skinned commercial doors, closer screws work loose and eventually pull through the skin because all the arm force lands on a few fasteners. The 12 gauge (.104) steel plate gives those fasteners something solid to bite into. It is not a closer and does not include one, it is the reinforcement the closer mounts to.
2) What size is the Don-Jo CR-300 reinforcement plate?
The CR-300 measures 14 x 3.77 inches in 12 gauge (.104) steel. Lay that out against the closer body footprint you are mounting before you drill, since the plate has to cover the full fastener pattern of the closer to do any good. If your closer's mounting pattern runs longer or taller than 14 x 3.77, this plate is the wrong size for the job.
3) Is the Don-Jo CR-300 for commercial doors or will it work on a house door?
Commercial. The CR-300 is a commercial-grade steel reinforcement built for the closer loads and traffic you see in office buildings, schools, hospitals, retail, warehouses, government facilities, and multi-tenant residential. A residential interior door rarely carries a closer heavy enough to need 12 gauge backing behind it.
4) How is the CR-300 sold, single plate or a box?
The CR-300 comes in a shelf pack of 10 plates. That suits a contractor or facility manager doing a run of openings, or a distributor stocking the shelf, more than someone replacing a single closer.
5) Is a closer reinforcement plate the same thing as a wrap around plate or a filler plate?
They solve different problems. A closer reinforcement like the CR-300 is flat backing that sits under closer hardware to stop pull-through. A wrap around plate folds over the door edge to cover damage or a mis-bored lock prep around a lockset. A filler plate covers an unused cutout left behind by removed hardware. If your issue is a sagging or loosening closer, the reinforcement is the part; if your issue is a chewed-up lock area or an abandoned cutout, it is not.
6) What material is the Don-Jo CR-300 made of?
Steel, at 12 gauge (.104) thickness. Steel matters here rather than a lighter alloy, because the whole point of the part is resisting deformation while the closer arm cycles the door thousands of times.
How fast can I get the Don-Jo CR300 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 Don-Jo CR300 come with a warranty?
Absolutely. The Don-Jo CR300 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 Don-Jo CR300?
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 Don-Jo CR300 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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