NGP 412 Aluminum Door Threshol...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$55.64
NGP 412 Aluminum Door Threshold 4" x 1/4" Smooth Surface with Milled Finish

NGP 412 Aluminum Door Threshold 4" x 1/4" Smooth Surface with Milled Finish

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Model: 412-36

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

$55.64
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NGP 412 Aluminum Door Threshold 4" x 1/4" Smooth Surface with Milled Finish

Professional Door Threshold Solution

The NGP 412 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 0.50 lbs./ft. combines durability with easy installation, featuring a mill finish for long-lasting appearance.

Professional Features & Benefits

  • Precision Dimensions: 3" wide x 1/4" tall profile designed for seamless integration with automatic door bottom systems.
  • Premium Aluminum Construction: Aluminum alloy 6063 with T5 temper provides exceptional strength-to-weight ratio and corrosion resistance.
  • Smooth Surface Design: Smooth top surface ensures optimal performance and compatibility with automatic door bottoms.
  • Lightweight Installation: At just 0.50 lbs./ft., the threshold offers easy handling and installation without compromising structural integrity.
  • Complete Hardware Package: Includes #10 x 1-1/2" FH zinc plated wood screws for secure mounting.
  • Durable Mill Finish: Mill finish provides long-lasting appearance and natural aluminum protection against environmental factors.
  • Standard Wall Compatibility: Typical wall thickness of .125" accommodates standard construction applications.

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 maintaining structural integrity at 0.50 lbs./ft. 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 412-36 – Frequently Asked Questions

1) Will the NGP 412 threshold work with an automatic door bottom?
That's exactly what the 412 is built around. The top face is smooth rather than ribbed or grooved, so an automatic door bottom drops onto a flat, continuous sealing surface instead of bridging across ridges and leaking air at every gap. NGP recommends it specifically for automatic door bottom applications. If you're pairing a threshold with a door bottom seal, the smooth-top saddle is the right family; a ribbed or fluted saddle is meant for traction underfoot, not for sealing against a drop bar.
2) How high does the NGP 412 aluminum saddle threshold sit above the floor?
A quarter inch. The 412 is a low-profile flat saddle at 1/4 inch tall, which is what lets it sit in a doorway without becoming a trip point or forcing you to undercut the door. That height also sets your door bottom clearance: whatever gap you leave under the leaf has to clear 1/4 inch of threshold plus the projection of any seal you mount on the door.
3) What lengths does the NGP 412 threshold come in, and can I cut it down for a narrower door?
Two stock lengths: 36 inches and 72 inches. The 36 inch covers a standard single 3-0 opening as-is. The 72 inch is the one to order for a pair of doors or for any single opening you need to trim, since 6063-T5 aluminum cuts cleanly with a carbide blade on a miter saw and the mill finish means a cut end doesn't leave a paint or anodize scar to touch up.
4) Do I need to buy fasteners separately for the NGP 412 threshold?
No, screws ship with it. Each 412 threshold comes with #10 x 1-1/2 inch flat head zinc plated wood screws. Those are wood screws, so they land straight into a wood subfloor or wood sill. Over concrete, terrazzo, or tile you'll want to substitute your own anchors, typically a sleeve or plastic anchor sized to a #10, since the supplied fasteners won't hold in masonry.
5) I need a fire rated saddle threshold for a labeled opening - what should I use instead of the NGP 412?
For a labeled fire door opening, look at the Cal-Royal CR2000 Series saddle threshold, which is a fire rated and ADA compliant saddle design, or the Cal-Royal CR3700 Series, which carries a 3-hour positive pressure fire rating. The CR3700 is the one to specify when the drawing or the AHJ calls out positive pressure testing and a 3-hour rating on the assembly; the CR2000 is the lighter-duty fire rated saddle with ADA compliance in the same series family. The NGP 412 is a smooth-top milled aluminum saddle at 4 inches by 1/4 inch intended for use with automatic door bottoms, so on a labeled opening where the threshold itself has to carry the rating, one of the two Cal-Royal series is the substitution to make. If the opening is not labeled, the NGP 412 stays in play.
6) What is the closest cross-brand equivalent to the NGP 412 aluminum saddle threshold?
The NGP 412 is a 1/4 inch high smooth-top aluminum saddle threshold, and the closest cross-brand match in the same flat saddle form is the Pemko 272 Series ADA compliant flat saddle threshold, which is also a 1/4 inch high heavy-duty aluminum flat saddle. The difference to check before you order is width across the opening: the Pemko 272 is a 6 inch wide saddle, while the NGP 412 covers a narrower 4 inch footprint. On a shallow sill or where the door stop and jamb leave you only a few inches of floor to cover, the 4 inch NGP 412 fits the opening; on a wider sill, thicker wall, or an out-swing opening where you want the saddle to reach past the frame, the 6 inch Pemko 272 covers more floor in one piece. Both are aluminum saddles at the same 1/4 inch height, so the transition height at the door bottom and the sweep or automatic door bottom clearance work out the same either way.
7) Is a mill finish aluminum threshold going to hold up in a high-traffic commercial entry?
The 412 is rated commercial, and the material is the reason. It's 6063 aluminum in T5 temper, the standard extrusion alloy for architectural thresholds, which resists corrosion from mopping, salt, and weather without a coating. Mill finish is the raw extruded aluminum surface, so there is no paint or anodize layer to wear through in the traffic path, it just takes on a slightly duller gray over time. Where you want a specific look to match other openings, that's when you go to an anodized threshold instead.
8) What's the difference between the NGP 412 threshold and the Pemko 272?
Both are flat aluminum saddles at 1/4 inch height, so they sit the same distance off the floor and present the same low profile. The Pemko 272 Series is a 6 inch wide heavy-duty saddle described as ADA compliant, which is the one to reach for when you need to cover a wider sill or a bigger gap between finished floors. The NGP 412 is the narrower smooth-top profile NGP calls out for automatic door bottom work. Pick on how much floor you need to cover and whether a door bottom seal is landing on it.
9) Can I use the NGP 412 saddle threshold on an interior door between two finished floors?
Yes, and that's a common use. A flat saddle like the 412 covers the joint where two floor finishes meet under the door, and at 1/4 inch it's low enough to walk over without catching. It's a smooth flat profile, not a weatherstripped or thermally broken exterior sill, so for an exterior entry where you're stopping water and air you want an interlocking or panic-style threshold with a seal instead.
10) Which saddle threshold gives me the best seal with an automatic door bottom - the NGP 412 or the Pemko 272?
The NGP 412 is built for that pairing specifically: its smooth precision-milled top surface is the reason it is recommended for use with automatic door bottoms, since an automatic door bottom drops a straight seal onto the threshold and needs an unbroken flat landing to seal against. Any ribbed or fluted saddle top leaves gaps under that seal. The Pemko 272 Series is also a flat saddle in aluminum at the same 1/4 inch height, so it presents a flat landing as well, and the practical choice between them comes down to how much floor you need to cover - the 272 runs 6 inches wide against the 4 inch NGP 412 - rather than to seal performance. If you are ordering the NGP 412 to work with an automatic door bottom, it comes in 36 inch and 72 inch lengths, so a standard 3-foot leaf takes the 36 inch and a pair of doors or a wide opening takes the 72 inch cut to size.
11) Is the Cal-Royal CR2000 a direct drop-in replacement for an NGP 412 threshold?
They are both aluminum saddle thresholds, but they are not interchangeable without checking the opening. The Cal-Royal CR2000 Series is a fire rated and ADA compliant saddle design, so it is specified where the opening is labeled or where the threshold has to be part of a rated assembly. The NGP 412 is a 4 inch by 1/4 inch smooth-top milled aluminum saddle set up for automatic door bottom use in commercial openings. Swapping one for the other changes the width of the saddle and the anchor pattern into the sill, which means the existing screw holes generally will not line up and the floor will need to be re-drilled. If you are matching a run of existing NGP 412 saddles across a building so the openings all look and feel the same underfoot, stay with the 412; if a specific opening got upgraded to a labeled door, that opening is the one that moves to the Cal-Royal.
12) What is the difference between the Cal-Royal CR2000 and CR3700 saddle thresholds?
Both are Cal-Royal saddle threshold series and both are alternatives to a plain aluminum saddle like the NGP 412 when the opening carries a label. The CR2000 Series is described as a fire rated and ADA compliant saddle threshold design. The CR3700 Series is rated to 3 hours under positive pressure, which is the specific test condition many current codes call out for door assemblies. If the submittal names positive pressure or a 3-hour assembly, the CR3700 is the series that answers it directly; if the requirement is simply a fire rated saddle that also meets ADA for the change in level at the doorway, the CR2000 Series covers it. For an unlabeled interior or service opening where neither rating is required, the NGP 412 smooth-top aluminum saddle is the straightforward saddle to use.
How fast can I get the NGP 412-36 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 412-36 come with a warranty?
Absolutely. The NGP 412-36 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 412-36?
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 412-36 from ZenSupply?
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