Don-Jo AST-21381 Security Stri...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$39.69
Don-Jo AST-21381 Security Strike, 18" x 1-3/8", Single Hole, Ferrous Steel

Don-Jo AST-21381 Security Strike, 18" x 1-3/8", Single Hole, Ferrous Steel

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Model: AST-21381-BP
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$39.69
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Don-Jo AST-21381 Security Strike — 18" x 1-3/8" Single Hole, Ferrous Steel

The Don-Jo AST-21381 is a heavy-duty commercial security strike measuring 18" in height by 1-3/8" in width, engineered for single-hole latch applications on commercial doors. Constructed from 13-gauge (.095) ferrous steel, this security strike delivers exceptional strength and resistance to forced entry in demanding commercial environments. Available in BP, SL, and WH finishes to suit a variety of door and frame aesthetics.

Key Features

  • Generous Dimensions: Measures 18" in height and 1-3/8" in width, providing extended coverage and reinforced protection along the door frame strike area.
  • Single Latch Hole Configuration: Designed with one latch hole for straightforward compatibility with standard single-latch door hardware setups.
  • Heavy-Gauge Ferrous Steel Construction: Manufactured from 13-gauge (.095) ferrous steel for superior durability and resistance to forced entry in high-traffic commercial applications.
  • Multiple Finish Options: Available in BP (Primed), SL (Silver), and WH (White) finishes to coordinate with a wide range of door frame colors and styles.
  • Commercial-Grade Performance: Engineered specifically for commercial door hardware applications where strength and long-term reliability are essential.
  • Convenient Shelf Pack Quantity: Sold in shelf packs of 10, making it efficient for contractors and facilities managers to stock and install across multiple openings.

Certifications & Compliance

  • Commercial-Grade Product
  • 13 Gauge (.095) Heavy-Duty Steel Construction

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 AST-21381?

Don-Jo security strike products are built to professional-grade standards, with the AST-21381 featuring 13-gauge (.095) ferrous steel construction that delivers the structural integrity required for commercial door security applications. Engineered for demanding environments, this strike provides reliable, long-lasting performance where door frame reinforcement and forced-entry resistance are critical priorities.

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:
AST 21381
Door Strike:
Security Strike
Product Category:
Parts and Accessories
Product Substrate:
Ferrous
Department:
Door Hardware

Don-Jo AST-21381-BP – Frequently Asked Questions

1) What size is the Don-Jo AST-21381 security strike and what opening is it meant for?
The AST-21381 is an 18 inch by 1-3/8 inch security strike with a single latch hole, meant to reinforce the strike side of a commercial door frame. The 18 inch length spreads latch force well above and below the latch point, which is what you want on a frame that has been pried or kicked. The 1-3/8 inch width suits a standard frame face; if your frame face is narrower than that, the plate will overhang.
2) Will the AST-21381 work on a door with a deadbolt as well as a latch?
No. The AST-21381 is punched with a single latch hole only, so it covers one latch point. A door with both a latchbolt and a separate deadbolt needs a two-hole strike or a second plate; using this one would leave the deadbolt with no prepped opening.
3) Will the Don-Jo AST-21381 security strike work on a pair of doors with no fixed frame jamb?
No. The Don-Jo AST-21381 is an 18 inch by 1-3/8 inch single-hole security strike in 13-gauge (.095) ferrous steel, made to reinforce the strike area of a door frame for a single latch. A pair of doors where the latch engages the inactive leaf instead of a jamb needs a strike built for that condition, such as the Detex 92 Strike Kit for double doors, which is supplied with tamper resistant fasteners. Use the AST-21381 where there is a frame jamb to reinforce.
4) What do I use instead of the Don-Jo AST-21381 when the latch has to catch on a pipe or round post rather than a flat jamb?
The AST-21381 is a flat 18 inch security strike designed to mount along a door frame strike area for a single latch hole. When the latching point is a pipe or round column, a strike shaped for that surface is the right part - the Trimco 1260P is a pipe adapter strike, supplied as the strike only. Keep the AST-21381 for conventional flat frames.
5) How heavy is the steel on the Don-Jo AST-21381 security strike?
It is 13-gauge (.095) ferrous steel. That is the substance behind the forced-entry claim: on a wood jamb the plate distributes the load across 18 inches of frame instead of letting the strike pocket split out. Ferrous means it will take paint and, unlike stainless or brass, needs a finish coat to stay corrosion free in wet locations.
6) Is this Don-Jo strike suitable for apartment and commercial entry doors, or is it a residential part?
It is classed as a commercial product and is used on office buildings, schools, healthcare, retail, warehouses, multi-tenant residential and municipal buildings. Property managers standardizing entry doors across a portfolio can use the same 18 inch plate on every opening that has a single latch, which keeps the look consistent and the spare parts simple.
7) How is the AST-21381 sold, in singles or in a pack?
It ships in shelf packs of 10. That works in your favour if you are reinforcing a run of openings in one building, but it is worth knowing before you order for a single door repair.
8) What is the difference between a security strike like this and a strike kit for a pair of doors?
The AST-21381 is a single-piece reinforcing strike plate for one latch on one frame. A pair of doors with an exit device is a different problem: for that you want something like the Detex 92 Strike Kit, a double door strike kit from the 90 Strike Series supplied with tamper resistant fasteners. If your latch has to engage a pipe or rail rather than a frame, the Trimco 1260P pipe adapter strike is the part for that. Match the strike to the opening condition first, then the finish.
9) Can I install the Don-Jo AST-21381 over an existing damaged strike area without replacing the frame?
That is the usual reason to fit one. The 18 inch plate covers the existing strike cutout and the torn wood or deformed metal around it, and the single latch hole lines up with the latch you already have. It is a repair and reinforcement part rather than a new latch prep, so the existing latch position governs where the plate sits.
10) Is the Trimco 1260P a direct replacement for a Don-Jo AST-21381?
No, they solve different problems. The Trimco 1260P is a pipe adapter strike furnished as a strike only, in the Trimco 1260 series. The Don-Jo AST-21381 is an 18 inch by 1-3/8 inch single latch hole security strike in 13-gauge (.095) ferrous steel that reinforces a standard frame against forced entry. Swapping one for the other changes the mounting condition, not just the part number.
11) I need a strike with tamper resistant screws - does the Don-Jo AST-21381 cover that?
The AST-21381 is specified by its 13-gauge (.095) ferrous steel body and 18 inch length, which is what gives it its forced-entry resistance along the frame. If the requirement is specifically tamper resistant fastening hardware supplied with the strike, the Detex 92 Strike Kit is furnished with tamper resistant fasteners and is built for double door openings.
12) What finishes does the Don-Jo AST-21381 come in?
Two finish choices are orderable: Brass Plated and Silver Coated. Brass plated suits openings with brass or bronze lever trim; silver coated blends with aluminum and satin chrome hardware. Both are coatings over the same 13-gauge ferrous steel body, so choose on appearance rather than strength.
How fast can I get the Don-Jo AST-21381-BP 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 AST-21381-BP come with a warranty?
Absolutely. The Don-Jo AST-21381-BP 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 AST-21381-BP?
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 AST-21381-BP 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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