NGP 411 Aluminum Door Threshol...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$47.52
NGP 411 1/4" Smooth Surface Threshold, Milled Aluminum Finish

NGP 411 Aluminum Door Threshold 3" x 1/4" Smooth Surface with Milled Finish

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Model: 411-36

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

$47.52
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NGP 411 Aluminum Door Threshold 3" x 1/4" Smooth Surface with Milled Finish

Professional Door Threshold Solution

The NGP 411 aluminum door threshold delivers professional-grade performance with precision-milled aluminum alloy 6063 construction in T5 temper. Measuring 3" wide x 1/4" tall with a smooth top surface, this threshold is specifically recommended for optimal results with automatic door bottoms. The lightweight design at .50 lbs./ft. combines durability with easy installation, featuring a typical wall thickness of .125" and mill finish for long-lasting performance.

Professional Features & Benefits

  • Precision Dimensions: 3" wide x 1/4" tall profile designed for optimal compatibility with automatic door bottom systems.
  • Premium Aluminum Construction: Aluminum alloy 6063 with T5 temper provides exceptional durability and corrosion resistance for commercial applications.
  • Smooth Surface Design: Smooth top surface ensures seamless operation with automatic door bottoms and reduces wear on moving components.
  • Lightweight Installation: At only .50 lbs./ft., the threshold offers easy handling and installation while maintaining structural integrity.
  • Complete Hardware Package: Includes #10 x 1-1/2" FH zinc plated wood screws for secure mounting to various substrates.
  • Mill Finish: Natural mill finish provides clean appearance and excellent base for field finishing if desired.
  • Optimal Wall Compatibility: Typical wall thickness of .125" accommodates standard construction requirements.

Technical Specifications

  • Department: Door Hardware

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 door threshold products deliver professional-grade reliability with aluminum alloy 6063 construction and T5 temper rating for demanding commercial applications. The precision-milled smooth surface design ensures optimal compatibility with automatic door bottom systems while the lightweight .50 lbs./ft. construction facilitates easy installation. Engineered for demanding commercial applications where dependable performance and seamless door operation are essential.

Manufacturer Resources

NGP Threshold Catalog

Product Specs

Department:
Door Hardware
Commercial/Residential:
Commercial
Product Category:
Door Trim and Accessories
Product Group:
Door Trim and Accessories
Product Subgroup:
Door Thresholds
Product Type:
Thresholds - Saddle
Subcategory:
Thresholds

NGP 411-36 – Frequently Asked Questions

1) How tall is the NGP 411 threshold, and will it be a trip hazard in a doorway?
The 411 stands 1/4 inch tall and 3 inches wide, a flat saddle profile that sits nearly flush to the floor. At a quarter inch there is no bevel needed, since a rise that low does not create the step a taller saddle does. If you need a wider bearing surface across the opening, the Pemko 272 Series is a 1/4 inch by 6 inch flat saddle.
2) Does the NGP 411 threshold come with screws, or do I need to buy fasteners separately?
Mounting hardware is in the box: #10 x 1-1/2 inch flat head zinc plated wood screws. Those are sized for wood subfloor or wood framing. Going into concrete or a slab, you will need masonry anchors and a matching bit instead, since the supplied wood screws will not hold in concrete.
3) What is the closest equivalent to the NGP 411 threshold from another manufacturer?
The Pemko 272 is the nearest flat saddle equivalent. Both are flat aluminum saddle thresholds at 1/4 inch height, so the rise over the finished floor is the same and an automatic door bottom set to one will drop to the other. The difference is width across the opening: the NGP 411 runs 3 inches wide, while the Pemko 272 is a 6 inch heavy-duty saddle. On a single door where the frame rabbet and the existing floor cut are sized to a 3 inch saddle, the 411 drops in; the 272 covers twice the floor joint and is the one to specify where an old wider threshold is being pulled out and the floor underneath needs to stay hidden.
4) Can the NGP 411 threshold be used on a fire rated door opening?
For a labeled opening, specify a threshold carried as fire rated rather than a general purpose saddle. The Cal-Royal CR2000 saddle threshold series is a fire rated and ADA compliant design, and the Cal-Royal CR3700 series carries a 3-hour positive pressure fire rating for openings where the inspector is looking for a positive pressure listing. The NGP 411 is a 1/4 inch smooth surface aluminum saddle recommended for use with automatic door bottoms, which suits interior and non-labeled exterior openings where the job is a low profile transition and a clean bearing surface for the door bottom seal.
5) What is a mill finish on an aluminum threshold, and can I paint or anodize it?
Mill finish means the 411 ships as the aluminum comes off the extrusion line, with no anodize or coating over it. The look is a plain silver-grey. It takes field finishing well, so if you are matching the threshold to existing dark bronze or painted hardware on the other openings, you can prime and paint it. Left bare it will dull slightly over time, which is normal for uncoated 6063.
6) Is the NGP 411 heavy duty enough for a commercial entrance with high foot traffic?
The 411 is a commercial threshold, extruded from 6063 aluminum in T5 temper with a typical wall thickness of .125 inch. That is a solid section rather than a thin stamped cover, and the alloy resists corrosion in wet entry conditions. It is the light, flat profile in the saddle family though, so for a heavy exterior entrance carrying carts or dollies, a thicker section carries the abuse better.
7) Is a 3 inch saddle threshold wide enough, or should I go with a 6 inch?
Three inches is enough when the threshold sits under the door and the door bottom does the sealing, which is the 411's job. Go wider when you need to bridge a gap between two floor materials, cover a rough sill, or give an exterior door more bearing surface against weather. For that, the Pemko 272 Series runs 6 inches wide at the same 1/4 inch height, so the profile height stays the same while the footprint doubles.
8) I need a threshold that works with an automatic door bottom - which one should I use?
The NGP 411 is the one built for that pairing: it is a 3 inch by 1/4 inch aluminum saddle with a smooth top surface, specifically recommended for use with automatic door bottoms, and the smooth face keeps the drop seal from riding on a ribbed or grooved surface. Flat saddles such as the Pemko 272, a 1/4 inch by 6 inch heavy-duty aluminum flat saddle, give the same flat bearing plane in a wider section. What to avoid under a drop seal is any ribbed or serrated top saddle, since the seal loses its continuous line of contact across the ribs.
9) The opening needs an ADA compliant threshold - is the NGP 411 the right choice or should I look at something else?
Where an ADA compliant design has to be named on the submittal, the Cal-Royal CR2000 saddle threshold series and the Pemko 272 flat saddle are both carried as ADA compliant designs, and the 272 is a 1/4 inch by 6 inch heavy-duty aluminum flat saddle. The NGP 411 is a 1/4 inch high smooth surface aluminum saddle in 3 inch width, so the physical rise at the door is low and flat, but if the specification requires a threshold designated ADA compliant, order one carried under that designation.
10) How much does the NGP 411 aluminum threshold weigh per foot?
Half a pound per foot, so a 72 inch piece runs about 3 pounds. One person handles any of the four lengths without help, which matters if you are swapping thresholds across a building single handed.
11) Can I cut a 72 inch threshold down instead of ordering the right length?
Aluminum saddle thresholds are routinely cut to the opening on site, and the NGP 411 comes in 36, 48, 60 and 72 inch lengths so a double door or a wide opening can be covered from one piece and trimmed to fit the frame. Cutting down is normal practice on a mill finish aluminum saddle; the cut end is unfinished aluminum, the same as the rest of the mill finish extrusion. Where an opening carries a fire rating, use a threshold carried for that condition, such as the Cal-Royal CR2000 fire rated series or the CR3700 with its 3-hour positive pressure rating, and follow the manufacturer instructions for that assembly.
How fast can I get the NGP 411-36 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 411-36 come with a warranty?
Absolutely. The NGP 411-36 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 411-36?
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 411-36 from ZenSupply?
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