Don-Jo DB-478M Dust Box for 4-...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$9.94
Don-Jo DB-478M Dust Box for 4-7/8" ASA and Mortise Strikes in Black Plastic

Don-Jo DB-478M Dust Box for 4-7/8" ASA and Mortise Strikes in Black Plastic

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Model: DB-478M

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

$9.94
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Don-Jo DB-478M Dust Box for 4-7/8" ASA and Mortise Strikes in Black Plastic

The Don-Jo DB-478M is a commercial-grade plastic dust box finished in black, designed specifically for use with standard 4-7/8" ASA and mortise strikes. This accessory provides a clean, finished appearance at the strike pocket while helping to keep the strike area free of debris and dust. Constructed from durable plastic in a black finish, the DB-478M is a reliable parts and accessories solution for door hardware installations in commercial environments.

Key Features

  • Designed for Standard Strikes: Compatible with standard 4-7/8" ASA and mortise strikes for broad application versatility.
  • Black Finish: Finished in black to coordinate with matching door hardware and strike components.
  • Durable Plastic Construction: Made from plastic material offering lightweight yet dependable performance in commercial door hardware applications.
  • Commercial-Grade Accessory: Rated for commercial use, making it suitable for demanding door hardware installations in high-traffic environments.
  • Dust and Debris Protection: Fills the strike pocket to prevent accumulation of dust and debris, maintaining a clean and professional installation.

Technical Specifications

  • Subcategory: Door Strikes
  • Product Group: Parts and Accessories
  • Product Subgroup: Door Strikes and Strike Boxes
  • Product Type: Door Strikes
  • Commercial/Residential: Commercial
  • Product Category: Parts and Accessories
  • Department: Door Hardware

Typical Applications

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

Why Don-Jo DB-478M?

Don-Jo door hardware accessories are engineered to complement professional-grade commercial installations with precision-fit components. The DB-478M dust box is purpose-built for standard 4-7/8" ASA and mortise strikes, ensuring a clean, finished look and reliable performance in demanding commercial door hardware applications.

Manufacturer Resources

DON-JO Strike Plates

Product Specs

Subcategory:
Door Strikes
Product Group:
Parts and Accessories
Product Subgroup:
Door Strikes and Strike Boxes
Product Type:
Door Strikes
Commercial/Residential:
Commercial
Product Model:
DB478M
Door Strike:
Dust Box
Product Category:
Parts and Accessories
Product Substrate:
Plastic
Department:
Door Hardware

Don-Jo DB-478M – Frequently Asked Questions

1) Will the DB-478M fit a standard 4-7/8 inch ASA strike?
Yes. The DB-478M is built for standard 4-7/8 inch ASA strikes and for mortise strikes, which is the common frame prep on commercial openings running cylindrical or mortise locks. If your frame is already prepped for a 4-7/8 inch ASA strike, this is the box that goes behind it.
2) Does the DB-478M come with a strike plate, or is that ordered separately?
It's the box only. The DB-478M is the dust box that sits in the frame pocket, so you order your 4-7/8 inch ASA or mortise strike plate separately along with whatever screws that strike ships with. If you're building the opening from scratch, that's two line items: strike plate plus this box.
3) What should I order if I need the strike face itself and not just the box behind it?
Match the part to what the door prep is missing. The Don-Jo DB-478M covers only the pocket: it is a black plastic dust box sized for standard 4-7/8 inch ASA and mortise strikes, with no lip or latch-catching face of its own. For the strike face, the Trimco 1260P is a pipe adapter strike supplied as the strike only, from the Trimco 1260 Series, and the Detex 92 Strike Kit is a double door strike kit that ships with tamper resistant fasteners. A locksmith replacing a damaged strike plate wants one of those two; a locksmith who has a sound strike but an open, dusty mortise wants the DB-478M.
4) What does a dust box like the Don-Jo DB-478M actually do behind the strike?
A dust box lines the mortise pocket cut into the frame behind the strike plate. The Don-Jo DB-478M drops into that pocket so the latch or bolt lands in a clean plastic cup instead of an open cavity full of grout, insulation, and jobsite dust. Two reasons trades use one: the pocket stays clear so the bolt seats fully every time, and you don't see raw framing through the strike cutout.
5) Is the DB-478M plastic dust box OK for a high-traffic commercial door, or do I need metal?
Plastic is the normal material for this part and the DB-478M is rated for commercial use. The box isn't structural, it takes no strike force, the strike plate and frame do. Its job is lining the pocket. Corridor doors in schools, hospitals, offices, and multi-tenant buildings run plastic dust boxes as standard.
6) I need a strike for a pair of doors with no mullion, is a dust box what I want?
No, a dust box won't do that job. The DB-478M lines the pocket behind a single 4-7/8 inch ASA or mortise strike in a frame. For an active/inactive pair, look at the Detex 92 Strike Kit, which is a double door strike kit supplied with tamper resistant fasteners. That is a strike assembly, not a pocket liner.
7) Is a Detex 92 strike kit an alternative to the Don-Jo DB-478M dust box?
No, they do different jobs. The DB-478M is a black plastic dust box that fills the strike pocket behind a standard 4-7/8 inch ASA or mortise strike, keeping debris out and giving the mortise a finished look. The Detex 92 Strike Kit is a double door strike kit from the Detex 90 Strike Series supplied with tamper resistant fasteners, so it is the strike itself and its mounting hardware rather than the pocket liner behind it. A double door opening being strike-kitted with the Detex 92 can still take a dust box behind a 4-7/8 inch ASA or mortise prep; ordering one does not remove the need for the other.
8) Does the black finish on the dust box matter if my strikes are satin chrome or brass?
No. The DB-478M is black plastic, and once the strike plate is screwed over it, almost nothing of the box shows. Black reads as shadow through the strike cutout, which is why it's the standard color regardless of the strike finish. Match your visible hardware on the strike plate and don't worry about the box behind it.
9) How many dust boxes should I order when I'm standardizing strikes across a building?
One per prepped opening. Every frame that gets a 4-7/8 inch ASA or mortise strike takes its own DB-478M behind it, so the count matches your door schedule one for one. Property managers replacing strikes across a floor typically add a few spares, since the old box is often cracked or missing once the original plate comes off.
10) Is there anything to choose when ordering the Don-Jo DB-478M?
Nothing to specify. The DB-478M ships one way: black plastic, sized for standard 4-7/8 inch ASA and mortise strike preps. No handing, no finish choice, no size options. Model number on the order is DB478M.
How fast can I get the Don-Jo DB-478M 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 DB-478M come with a warranty?
Absolutely. The Don-Jo DB-478M 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 DB-478M?
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 DB-478M 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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