NGP 158SDKB 120 Overlapping As...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$160.91
NGP NGP 158SDKB Overlapping Astragal with Silicone Seal, 120", Dark Bronze NGP-158SDKB 120

NGP 158SDKB 120 Overlapping Astragal with Silicone Seal - 120" Dark Bronze Aluminum

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Model: 158SDKB 120
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$160.91
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NGP Overlapping Astragal with Silicone Seal - 120" Dark Bronze Aluminum

Professional Door Sealing Solution for Commercial Applications

The NGP Overlapping Astragal with Silicone Seal delivers superior door sealing performance with aluminum alloy 6063, T5 temper construction and synthetic rubber polymer siloxane seal. This 120" dark bronze unit provides excellent flexibility and memory with temperature resistance from -100 F to 500 F, making it ideal for demanding commercial environments. BHMA certified to ANSI/BHMA A156.22 performance standards for heat and cold applications.

Professional Features & Benefits

  • Maximum Height Capacity: 120" length accommodates tall commercial door applications with complete coverage.
  • Extreme Temperature Performance: Operates reliably from -100 F to 500 F while maintaining flexibility at temperature extremes.
  • Heavy-Duty Construction: Aluminum alloy 6063, T5 temper provides exceptional durability for high-traffic commercial installations.
  • Advanced Seal Technology: Synthetic rubber polymer siloxane offers excellent flexibility, memory, and resistance to aging.
  • Fire Suppression Compatibility: Recommended for areas using FM200 or Halon Fire Suppression Systems with flame-resistant properties.
  • Weather Resistance: Moisture resistant with excellent resistance to ozone, UV, and aging for long-term performance.
  • BHMA Certification: Certified to ANSI/BHMA A156.22 performance tests for heat and cold compliance assurance.
  • Complete Installation Hardware: Includes #8 X 1" FH U/C SMS fasteners for secure mounting to beveled edge doors.

Technical Specifications

  • Commercial/Residential: Commercial
  • Department: Door Hardware
  • Product Category: Door Trim and Accessories
  • Product Group: Door Trim and Accessories
  • Product Subgroup: Astragals, Gaskets and Weatherstripping
  • Product Type: Astragals
  • Subcategory: Gaskets & Weatherstripping

Professional Applications

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

Why Choose NGP Quality?

NGP astragal products deliver professional-grade reliability with aluminum alloy 6063, T5 temper construction and BHMA certification to ANSI/BHMA A156.22 performance standards. The synthetic rubber polymer siloxane seal technology provides exceptional temperature range performance and resistance to environmental factors. Engineered for demanding commercial applications where dependable sealing performance is essential.

Product Specs

Product Group:
Door Trim and Accessories
Product Subgroup:
Astragals, Gaskets and Weatherstripping
Product Type:
Astragals
Subcategory:
Gaskets & Weatherstripping
Commercial/Residential:
Commercial
Product Category:
Door Trim and Accessories
Department:
Door Hardware

NGP 158SDKB 120 – Frequently Asked Questions

1) What is an overlapping astragal like the NGP 158SDKB used for on a pair of doors?
An overlapping astragal mounts to the edge of one leaf of a pair and laps over the gap at the meeting stiles, so the two doors seal against each other instead of leaving an open joint. The NGP 158SDKB carries a silicone seal on an aluminum extrusion and mounts to a beveled door edge. If your pair has a center mullion, you don't need a meeting stile astragal at all; if your problem is the gap under the door rather than between the leaves, that's a door bottom or sweep, not this part.
2) Will a silicone astragal hold up in a walk-in freezer or on a boiler room door?
Yes on both ends of the scale. The seal is a synthetic rubber polymer siloxane rated from -100 F to 500 F and it keeps its flexibility and memory at those extremes, which is why it gets specified where a vinyl or pile insert would stiffen and crack in the cold or take a set in the heat. It's also moisture resistant with resistance to ozone, UV, and aging.
3) Is the NGP 158SDKB astragal certified to a gasketing standard?
It's BHMA certified to the ANSI/BHMA A156.22 performance tests for heat and cold. That's the gasketing and edge seal standard, and it's the line a facilities or government spec usually calls for when it names a seal by standard rather than by part number.
4) What's the difference between an overlapping astragal and a split or T-astragal for double doors?
An overlapping astragal like the NGP 158SDKB mounts on one leaf and laps over the other, so that leaf has to close second and it works on a pair with an active and inactive leaf. A split astragal puts half on each leaf so neither one overlaps, which is what you want when both leaves need to swing independently. ZenSupply carries the Pemko 369 split astragal seal with a pile brush insert, and the Cal-Royal EAST-501 aluminum T-astragal with a vinyl insert, if the overlapping style won't work on your pair.
5) My double doors are fire rated. Is this NGP astragal the right seal, or do I need something else?
For a labeled fire door pair, use a seal that carries the fire rating itself. ZenSupply stocks the Pemko 369 split astragal seal, a 13/32 by 11/32 inch aluminum fire-rated section with a pile brush insert, which is the one to look at for a rated opening. The NGP 158SDKB is a silicone-sealed overlapping astragal specified for temperature extremes and clean agent rooms.
6) I need an astragal that a mortise lock can latch into on a pair of doors. Does this one work?
No. The 158SDKB is a gasketing astragal, so it seals the meeting stile but takes no lock prep. For a pair where the active leaf locks into the inactive one, look at the Trimco 5001 lock astragal in stainless steel, which is made for use with mortise or cylindrical locks, or the Trimco 5002 at 1-9/16 by 6 inches for cylindrical locks. Those are lock astragals; this NGP part is a weather and smoke gap seal.
7) What is the difference between the NGP 158SDKB overlapping astragal and a T-astragal like the Cal-Royal EAST-501?
The NGP 158SDKB is an overlapping astragal: aluminum alloy 6063 T5 temper with a synthetic rubber polymer siloxane seal, mounted to the beveled edge of the active or inactive leaf so the extrusion laps across the meeting stile. The Cal-Royal EAST-501 is an aluminum T-astragal with a vinyl insert for double doors, which mounts as a T profile at the meeting stiles rather than lapping over them. Both seal a pair of doors; the profile and the seal material differ, so match whichever the meeting-stile detail on the opening calls for.
8) What is a brush-seal alternative to a silicone overlapping astragal on a pair of doors?
The Pemko 300 Series is an adjustable astragal with a self-adjusting pile brush for double doors, and the Pemko 369 is a split astragal seal with a pile brush insert in a 13/32 inch by 11/32 inch aluminum extrusion. Both use pile brush at the meeting stiles instead of the synthetic rubber polymer siloxane seal carried on the NGP 158SDKB. Pile tolerates out-of-plumb meeting stiles by sweeping across the gap; the silicone seal on the 158SDKB is rated by NGP for -100 F to 500 F service and is BHMA certified to ANSI/BHMA A156.22 heat and cold performance tests.
9) Which astragal should I use on a fire-rated pair instead of the NGP 158SDKB?
For a labeled pair, the Pemko 369 split astragal seal is the fire-rated option in the group: a 13/32 inch by 11/32 inch aluminum extrusion with a pile brush insert, split so a section mounts to each leaf. The NGP 158SDKB overlapping astragal is an aluminum 6063 T5 unit with a silicone seal that NGP recommends for areas using FM200 or Halon fire suppression systems, which is a suppression-agent containment application rather than a door fire label. Confirm the listed hardware against the door label before ordering.
10) Is a Trimco 5001 lock astragal a substitute for the NGP 158SDKB?
No. 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 inch by 6 inch for cylindrical locks. Those are short pieces that cover the gap at the lock, not full-height weatherseal. The NGP 158SDKB is a 120 inch aluminum overlapping astragal with a continuous silicone seal running the height of the opening. If the goal is to close the meeting-stile gap top to bottom, the lock astragals do not do that job.
11) Does the NGP 158SDKB overlapping astragal come with fasteners, or do I need to buy screws?
Fasteners are included: #8 x 1 inch flat head undercut sheet metal screws, sized for mounting to a beveled door edge. Nothing else ships with it, so if you're gasketing the full opening you're still ordering head and jamb seal and a door bottom separately.
12) Can I use this astragal on a room protected by an FM200 or Halon clean agent system?
That's a listed application for it. NGP recommends this silicone-sealed astragal for spaces served by FM200 or Halon fire suppression systems, and the seal is flame resistant. Clean agent rooms depend on the enclosure holding concentration, so the meeting stile of a pair is one of the leak paths that gets sealed.
13) Will the dark bronze finish match my existing bronze anodized aluminum storefront doors?
Dark bronze is the only finish this 158SDKB is built in, and it's meant to disappear against dark bronze anodized aluminum doors and frames, which is the common commercial storefront and entrance color. If your doors are clear anodized, mill, or painted, this one will read as a dark stripe down the meeting stile.
14) My pair of doors has an uneven gap at the meeting stiles. Will a fixed overlapping astragal close it?
An overlapping extrusion laps a consistent amount, so a gap that varies top to bottom, or doors that have shifted, is better handled by an adjustable seal. ZenSupply carries the Pemko 300 Series adjustable astragal with a self-adjusting pile brush for double doors, which takes up variation as the doors move. If the gap is uniform and the leaves close in sequence, the NGP 158SDKB silicone astragal does the job and gives you a solid seal instead of a brush.
15) Is a silicone seal better than a pile brush for keeping air and dust out of an exterior pair?
They do different jobs. A silicone compression seal like the one on the NGP 158SDKB gives a continuous contact seal against air, moisture, and light, and holds up from -100 F to 500 F. A pile brush, like the insert on the Pemko 369 or the self-adjusting brush on the Pemko 300 Series, slides more easily and tolerates misalignment, but it doesn't seal air as tightly. For a conditioned exterior opening or a clean agent room, the silicone is the one to specify.
16) Which lock astragal goes with a cylindrical lock, the Trimco 5001 or the 5002?
Both work with a cylindrical lock. The Trimco 5002 is a stainless steel lock astragal at 1-9/16 inch by 6 inch specified for cylindrical locks, while the Trimco 5001 stainless steel lock astragal is specified for use with either mortise or cylindrical locks. If the pair carries mortise locks anywhere in the fleet, the 5001 covers both preps. These pieces address the lock area only; full-height sealing at the meeting stiles is what an overlapping astragal such as the NGP 158SDKB provides.
17) The meeting stiles on my double doors are out of alignment. What astragal handles that better than a fixed overlapping unit?
The Pemko 300 Series is an adjustable astragal with a self-adjusting pile brush for double doors, which is the option in this group built to take up variation at the meeting stiles. The NGP 158SDKB is a fixed aluminum 6063 T5 extrusion with a silicone seal that fastens to a beveled edge door with the supplied #8 x 1 inch FH U/C sheet metal screws, so it seals best against consistently aligned stiles. On a rehung or racked pair, the self-adjusting pile is the more forgiving profile.
18) Can I standardize this astragal across a building with both interior and exterior door pairs?
It's a commercial-duty part, and the same 120 inch dark bronze section covers interior and exterior pairs alike as long as every opening you're standardizing on uses an overlapping meeting stile and dark bronze suits the finish scheme. The 6063-T5 aluminum extrusion and A156.22 certification are what a facilities or procurement spec is usually after when standardizing gasketing across a fleet of openings. Doors that need a lock astragal or a fire-rated seal come off that list and get specified separately.
19) Is there a stainless steel astragal instead of aluminum?
Yes. The Trimco 5001 and Trimco 5002 lock astragals are stainless steel, though both are lock-area pieces rather than full-height seals. Among the full-height options, the NGP 158SDKB is aluminum alloy 6063 T5 temper in a dark bronze finish, the Cal-Royal EAST-501 is an aluminum T-astragal with a vinyl insert, and the Pemko 369 split astragal seal is aluminum. If a stainless material spec applies only at the lock, the Trimco pieces meet it; a full-height stainless seal is a different requirement.
How fast can I get the NGP 158SDKB 120 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 NGP 158SDKB 120 come with a warranty?
Absolutely. The NGP 158SDKB 120 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 NGP 158SDKB 120?
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 NGP 158SDKB 120 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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