Don-Jo AST-21346 Security Stri...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$39.00
$24.09
Don-Jo AST-21346 Security Strike 18" x 1-3/4" Double Hole for 5-1/2" and 6" Centered Locksets

Don-Jo AST-21346 Security Strike 18" x 1-3/4" Double Hole for 5-1/2" and 6" Centered Locksets

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Model: AST-21346-WH
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$39.00
$24.09
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Don-Jo AST-21346 Security Strike 18" x 1-3/4" Double Hole for 5-1/2" and 6" Centered Locksets

The Don-Jo AST-21346 is a heavy-duty commercial security strike measuring 18" in height by 1-3/4" in width, constructed from ferrous material at a robust 13-gauge (.095) thickness for exceptional strength and resistance to forced entry. This double-hole security strike is specifically engineered to accommodate both 5-1/2" and 6" centered locksets, providing versatile compatibility across a wide range of commercial door hardware configurations. Available in BP, SL, and WH finishes, the AST-21346 is an ideal replacement or upgrade component for commercial door applications requiring a reliable, long-lasting strike solution.

Key Features

  • Generous Dimensions: Measures 18" in height and 1-3/4" in width, providing broad coverage and secure door frame integration for commercial applications.
  • Heavy-Gauge Construction: Fabricated from 13-gauge (.095) ferrous material, delivering superior strength and durability against forced entry and everyday wear.
  • Double Hole Design: Features two latch holes specifically designed to accommodate 5-1/2" and 6" centered locksets, ensuring broad lockset compatibility.
  • Multiple Finish Options: Available in BP, SL, and WH finishes to coordinate with a variety of door hardware and frame aesthetics.
  • Commercial-Grade Security: Engineered as a security strike for demanding commercial environments where door integrity and access control are critical priorities.
  • Convenient Shelf Pack: Supplied in shelf packs of 10, making it practical for contractors, distributors, and facility managers stocking multiple units.

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-21346?

Don-Jo security strike products are built to commercial-grade standards, with the AST-21346 featuring 13-gauge (.095) ferrous construction that delivers the structural integrity required in high-traffic and high-security door applications. Engineered to accommodate both 5-1/2" and 6" centered locksets in a single double-hole design, this strike simplifies specification and installation while ensuring dependable performance across a broad range of commercial door hardware setups.

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 21346
Door Strike:
Security Strike
Product Category:
Parts and Accessories
Product Substrate:
Ferrous
Department:
Door Hardware

Don-Jo AST-21346-WH – Frequently Asked Questions

1) Will the Don-Jo AST-21346 security strike work with my 5-1/2 inch center lockset, or do I need the 6 inch version?
Both. The AST-21346 is a double hole strike, and the two holes are cut for 5-1/2 inch and 6 inch centered locksets in the same plate. So one part number covers either center dimension, which is the reason to reach for it when a building has a mix of lockset centers and you do not want to stock two strikes.
2) How much of the door frame does an 18 inch security strike cover, and will it fit a standard hollow metal jamb?
The AST-21346 measures 18 inches by 1-3/4 inches, so it runs well above and below the latch area rather than sitting only at the strike cutout. That length is what spreads a kick or pry load across the jamb instead of concentrating it at the existing strike prep. The 1-3/4 inch width is the dimension to check against your jamb face: measure the flat of the frame face beside the stop, and if it is under 1-3/4 inches the plate will not sit flat.
3) How thick is the Don-Jo AST-21346 strike, and is it strong enough for a high traffic commercial entry?
It is 13-gauge, .095 inch, ferrous. That is a structural thickness for a strike plate, not a decorative wrap, and it is what the plate relies on to resist a spread or pry attack at the latch. Don-Jo lists it as a commercial security strike, and it is the kind of part used on office, school, healthcare, retail, warehouse, multi-tenant and municipal openings.
4) I have a pair of doors with no mullion. Will this Don-Jo security strike work there?
No. The AST-21346 is a jamb-mounted strike for a single door latching into a frame, cut for 5-1/2 inch and 6 inch centered locksets. A pair of doors with no mullion has no jamb at the meeting stile for it to fasten to. For a double door opening, look at the Detex 92 Strike Kit, which is a double door strike kit and ships with tamper resistant fasteners.
5) Will the Don-Jo AST-21346 cover the old strike cutout when I upgrade an existing door?
That is what the size is for. At 18 inches long the plate reaches far past a standard strike prep, so an enlarged, torn, or previously repaired cutout ends up behind solid 13-gauge material. Line up the appropriate hole, 5-1/2 inch or 6 inch center depending on your lockset, with the existing latch position, then fasten through fresh solid frame above and below rather than only into the old damaged holes.
6) Is the Detex 92 strike kit a substitute for the Don-Jo AST-21346 security strike?
No - they solve different openings. The Don-Jo AST-21346 is an 18" x 1-3/4" security strike in 13-gauge (.095) ferrous material with two latch holes, so one part covers both 5-1/2" and 6" centered locksets on a standard hinged commercial door frame. The Detex 92 Strike Kit is a double door strike kit from the 90 Strike Series and comes with tamper resistant fasteners; it is intended for a double door opening rather than a single-door frame reinforcement. If you are reinforcing the strike side of a single door against forced entry, the AST-21346 is the part; if you are dealing with the meeting stile of a pair of doors, the Detex 92 kit addresses that instead.
7) What finishes does the Don-Jo AST-21346 come in?
Three: BP brass plated, SL silver coated, and WH white coated. Silver is the usual pick against aluminum or painted gray frames, white against a painted white jamb in multi-family and healthcare corridors, and brass plated where the existing lock trim is brass. Since the plate is ferrous, the finish is also the corrosion coating, so match it to the environment as well as the look.
8) Can I buy one Don-Jo AST-21346 strike or does it come in a multi-pack?
The AST-21346 is supplied in shelf packs of 10. That suits the way it usually gets bought, a property manager or MRO buyer hardening a run of openings across a building rather than fixing one door, and it keeps a stock of matched plates on the shelf for turnovers.
9) Is a security strike the same thing as a wrap-around plate or a latch protector?
Not the same job. The AST-21346 replaces the strike itself on the frame side, taking the latch and spreading the load down 18 inches of jamb in 13-gauge steel. A latch protector goes on the door and shields the gap so the latch cannot be shimmed or jimmied. If your failure mode is the frame spreading or the strike tearing out, this is the part. If it is someone slipping the latch, that is a different piece of hardware.
10) I need a strike to fit around a pipe or tube frame. Will the Don-Jo AST-21346 work?
It will not. The AST-21346 is a flat 18 inch by 1-3/4 inch plate meant for a flat jamb face. For a pipe frame you want a strike made for that profile, such as the Trimco 1260P pipe adapter strike, which is sold as a strike only.
11) What is the difference between a Don-Jo AST-21346 security strike and a Trimco 1260P pipe adapter strike?
They are not the same class of part. The Don-Jo AST-21346 is a full-height security strike - 18" tall by 1-3/4" wide, 13-gauge (.095) ferrous - that reinforces the strike edge of the frame and carries two latch holes so it lands on either a 5-1/2" or a 6" centered lockset. The Trimco 1260P is a pipe adapter strike, supplied as the strike only, from the 1260 Series; it adapts a latch to a pipe or tubular frame condition rather than reinforcing a conventional hollow metal or wood frame. Specify the AST-21346 when the goal is anti-pry reinforcement on a standard commercial door; specify the 1260P when the strike has to mount to pipe.
12) I need to standardize strike reinforcement across a building with mixed 5-1/2" and 6" lockset centers - do I need two different parts?
One part covers both. The Don-Jo AST-21346 uses a double hole layout that accepts 5-1/2" and 6" centered locksets on the same 18" x 1-3/4" plate, so a facility with mixed lockset centers can carry a single SKU instead of two, in BP brass plated, SL silver coated, or WH white coated to match existing frames. The alternatives in this space are narrower in scope: the Detex 92 Strike Kit is specific to double door openings and the Trimco 1260P is a pipe adapter strike, so neither consolidates a mixed single-door population the way the AST-21346 does.
How fast can I get the Don-Jo AST-21346-WH 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-21346-WH come with a warranty?
Absolutely. The Don-Jo AST-21346-WH 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-21346-WH?
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
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