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Pemko 3572SP Offset Security Astragal with Galvanized Steel Finish - 2-1/4"; Width for Single Outswing Doors
Heavy-Duty Door Security Reinforcement Solution
The Pemko 3572SP Offset Security Astragal provides professional-grade security reinforcement for single outswing wood or metal doors by covering the critical gap between door and frame. This 2-1/4"; wide galvanized steel security bar features 1/8"; thickness construction and mounts with 1/4"; x 20 thru-bolt machine screws for maximum tamper resistance. UL 10C fire rated with positive pressure testing, this security astragal delivers reliable forced entry protection for commercial applications.
Professional Features & Benefits
- Full-Height Gap Protection: 2-1/4"; width with 1/8"; thickness provides comprehensive coverage of the door-to-frame gap to prevent prying and manipulation attempts.
- Heavy-Duty Construction: Galvanized steel finish delivers superior corrosion resistance and long-term durability for demanding commercial environments.
- Secure Mounting System: Surface-mounted design with 1/4"; x 20 thru-bolt machine screws ensures tamper-resistant installation that cannot be easily compromised.
- Fire-Rated Performance: UL 10C positive pressure fire rating maintains code compliance for fire door applications when installed per NFPA 80 requirements.
- Universal Door Compatibility: Non-handed design works with single outswing wood or metal doors, providing flexible installation options.
- Custom Length Capability: Available in custom cut lengths with 80"; minimum to accommodate various door heights and applications.
- Educational Facility Approved: Specified and approved by major school districts for classroom doors opening onto exterior walkways.
- Manufacturer Warranty: 5 Year warranty coverage for added confidence and protection.
Technical Specifications
- Commercial/Residential: Commercial
- Department: Door Hardware
- Features: When Installing Pairs of Fire Doors Care Must be Taken to Maintain the Requirements of NFPA 80
- Hang Type: Offset Hung
- Product Category: Door Trim and Accessories
- Product Dimension: W: 2", H: 1/8";
- Product Finish: SP-Galvannealed Steel
- Product Group: Door Trim and Accessories
- Product Model: 3572SP
- Product Subgroup: Astragals, Gaskets and Weatherstripping
- Product Substrate: Aluminum
- Product Type: Astragals
- Subcategory: Gaskets & Weatherstripping
- UL Listing Type: Air Infiltration Tested, Fire Rated- UL10C- Positive Pressure, Underwriters Laboratory 4L10
- Warranty: 5 Year
Professional Applications
- Educational Facilities and Classroom Security
- Commercial Office Buildings
- Healthcare Institution Exterior Doors
- Retail Establishment Security
- Industrial and Warehouse Facilities
- Government and Municipal Buildings
- Multi-Tenant Residential Properties
Why Choose Pemko Quality?
Pemko security astragals deliver professional-grade reliability with galvanized steel construction rated for UL 10C positive pressure fire applications. 5 Year warranty coverage provides added confidence for demanding commercial installations. Engineered for educational facilities and commercial applications where dependable forced entry protection and code compliance are essential.
Manufacturer Resources
Pemko/Markar Products Full Line Catalog
Product Specs
- Features:
- When Installing Pairs of Fire Doors Care Must be Taken to Maintain the Requirements of NFPA 80
- Warranty:
- 5 Year
- Product Group:
- Door Trim and Accessories
- Product Subgroup:
- Astragals, Gaskets and Weatherstripping
- Product Type:
- Astragals
- Subcategory:
- Astragals
- Commercial/Residential:
- Commercial
- UL Listing Type:
- Air Infiltration Tested, Fire Rated- UL10C- Positive Pressure, Underwriters Laboratory 4L10
- Hang Type:
- Offset Hung
- Product Model:
- 3572SP
- Product Finish:
- SP-Galvannealed Steel
- Product Dimension:
- W: 2", H: 1/8"
- Product Category:
- Door Trim and Accessories
- Product Substrate:
- Aluminum
- Department:
- Door Hardware
Pemko 3572SP84 – Frequently Asked Questions
1) Will a Pemko 3572SP security astragal stop someone prying or shimming the latch on an outswing exterior door?
That is what the 3572SP is built to do. It is a 1/8 inch thick galvanized steel bar, 2-1/4 inches wide, that runs the height of the opening and covers the gap between the door edge and the frame, so a pry bar or a shim has nothing to reach through to the latch. It surface mounts with 1/4 x 20 thru-bolt machine screws rather than wood screws, so the fasteners cannot simply be backed out or pulled from the outside. School districts have specified it on classroom doors that open onto exterior walkways, which is the same attack it is answering there.
2) I have a pair of doors with no mullion. Can I use the Pemko 3572SP astragal on them?
No. The 3572SP is an offset security astragal for a single outswing door, covering the gap between one leaf and the frame. A pair needs an astragal made for the meeting stile between two leaves. The Cal-Royal EAST-501 is an aluminum T-astragal with a vinyl insert for double doors, and NGP makes overlapping astragals for pairs, the 176A in anodized aluminum and the 109N with a neoprene seal in an 84 inch length. If the pair is fire rated, whatever goes on the meeting stile has to keep the opening within NFPA 80 requirements.
3) Can the Pemko 3572SP astragal go on a fire rated door?
Fire rated, and tested under positive pressure to UL 10C, with an Underwriters Laboratory listing. It has also been air infiltration tested. The one thing to watch: on pairs of fire doors, the installation has to be done so the opening still meets NFPA 80, and the 3572SP itself is a single-door part, so on a pair you are looking at the meeting stile separately.
4) How does the Pemko 3572SP mount, and do I have to drill through the door?
Yes, the door gets drilled through. The 3572SP is surface mounted with 1/4 x 20 thru-bolt machine screws that pass all the way through the leaf, which is what makes the mounting tamper resistant, since there is no screw head on the outside that can be backed out or pulled. It mounts to wood or hollow metal doors either way. Plan the install around through-drilling the leaf at each fastener location, and on a hollow metal door check that your bolt locations clear any internal reinforcement or the lock case.
5) What is the closest equivalent to the Pemko 3572SP security astragal from another manufacturer for a fire-rated opening?
The nearest peer is the NGP 139SP, a steel fire-rated door astragal with 3/4 inch overlap coverage. The Pemko 3572SP is an offset security astragal in a galvannealed steel finish, 2-1/4 inches wide and 1/8 inch thick, thru-bolted with 1/4 x 20 machine screws, and it is fire rated to UL10C positive pressure. Both are steel parts intended for fire door work. The 139SP is characterized by its 3/4 inch overlap of the gap, while the 3572SP presents a full 2-1/4 inch face across the door-to-frame gap and is mounted through the door rather than surface screwed. On any fire door pair, the NFPA 80 requirements have to be maintained regardless of which astragal is used.
6) Are the Trimco 5001 and 5002 lock astragals a substitute for a Pemko 3572SP?
They solve a different problem. The Trimco 5001 is a stainless steel lock astragal for use with mortise or cylindrical locks, and the Trimco 5002 is a stainless steel lock astragal measuring 1-9/16 by 6 inches for use with cylindrical locks - short pieces sized to the latch area. The Pemko 3572SP runs the height of the door, offered at 80, 84 and 96 inches, and covers the door-to-frame gap along the full opening with a 2-1/4 inch wide, 1/8 inch thick bar. If the requirement is shielding the latch at the lock, the Trimco parts are built for that; if the requirement is full height gap coverage against prying, the 3572SP is the part that does it.
7) Is the Pemko 3572SP astragal handed? Do I need to know which way the door swings open?
Non-handed, so the same part works on a left or right hand door and there is no handing to specify when ordering. What does matter is that it is an offset hung, outswing application: the astragal covers the door-to-frame gap on a single door that swings out. Length is effectively the only thing you pick, 80, 84 or 96 inches, or a custom cut at 80 inches minimum.
8) Do I need a full height astragal on my door, or just one at the lock?
Depends what you are protecting. The Pemko 3572SP is a full height part, 80 inches minimum, so it shields the entire door-to-frame gap top to bottom, which is what you want when the concern is prying anywhere along the edge or on a door that takes abuse. If the only exposure is the latch itself, a short lock astragal does the job with far less drilling: the Trimco 5002 is a 1-9/16 by 6 inch stainless piece for cylindrical locks, and the Trimco 5001 stainless lock astragal is used with mortise or cylindrical locks. Those cover the lock area only, not the rest of the edge.
9) Does the Pemko 3572SP seal the door against air and weather, or is it purely a security part?
It is a solid galvannealed steel bar built to block the gap, and it does carry an air infiltration test listing, but the sealing comes from the metal covering the gap rather than from a gasket. If you need a compressible seal at the same time, NGP's 109N overlapping astragal is supplied with a neoprene seal and the Cal-Royal EAST-501 T-astragal carries a vinyl insert, both of them for door pairs. On a single outswing door, the usual approach is to let the 3572SP handle the security side of the gap and let the perimeter gasketing and door bottom handle the weather.
10) If the job is sealing the gap against weather rather than resisting forced entry, what should be used instead of the Pemko 3572SP?
The NGP 109N is an overlapping astragal with a neoprene seal, sold as commercial door weatherstripping in an 84 inch length, and it puts a compressible seal across the gap. The Pemko 3572SP approaches the same gap as a rigid barrier - 1/8 inch thick galvannealed steel, 2-1/4 inches wide, thru-bolted with 1/4 x 20 machine screws for tamper resistance - and it is air infiltration tested in addition to its UL10C positive pressure fire rating. A neoprene seal conforms to the gap; the steel bar covers it. Choose by whether the opening needs air control or pry resistance at the frame.
11) How does the Pemko 3572SP compare to an aluminum astragal like the NGP 139A or NGP 176A?
The NGP 139A is a solid metal astragal of anodized aluminum construction, and the NGP 176A 84 is an overlapping astragal in anodized aluminum door trim at 84 inches. The Pemko 3572SP carries a galvannealed steel finish, measures 2-1/4 inches wide by 1/8 inch thick, mounts with 1/4 x 20 thru-bolt machine screws, and holds a UL10C positive pressure fire rating with air infiltration testing. Anodized aluminum gives a finished architectural face at the gap; the galvannealed steel bar is the one carrying the UL10C listing and the thru-bolted mounting. Match the choice to whether the opening is specified for appearance and gap coverage or for fire rating and forced entry protection.
12) Which astragal covers a 96 inch tall door opening?
The Pemko 3572SP is supplied at 80, 84 and 96 inches, so a 96 inch leaf is covered by a stock length. Among the alternatives, the NGP 109N overlapping astragal with neoprene seal and the NGP 176A 84 overlapping anodized aluminum astragal are both 84 inch pieces. Measure the leaf height before ordering, since the astragal has to run the height being protected for the gap coverage to be continuous.
13) Will a Pemko 3572SP hold up on an exterior door that sees weather all year?
The finish is galvannealed steel, which is the SP in the model number, and that coating is what carries it on exterior openings rather than a painted or plated finish. It is rated as a commercial part, and the application it is specified for, classroom doors opening onto exterior walkways, is an exposed one. It has also been air infiltration tested. For an anodized aluminum look instead of galvannealed steel, NGP's 139A is a solid metal astragal in anodized aluminum.
14) How much gap coverage does the Pemko 3572SP give compared with a standard overlapping astragal?
The 3572SP is 2-1/4 inches wide and 1/8 inch thick, so it is a heavy bar covering a wide band across the door and frame rather than a thin lip. By comparison, NGP's 139SP steel fire-rated astragal is specified at 3/4 inch of overlap coverage. If the opening only needs the gap closed and dressed, the narrower overlap is enough; if the door has already been pried or the opening is a known target, the wider, thicker section and the thru-bolt mounting are what you are buying with the Pemko.
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Does the Pemko 3572SP84 come with a warranty?
Absolutely. The Pemko 3572SP84 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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