NGP 355 Half Saddle Threshold ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$99.75
$99.07
NGP 355 1/2" Half Saddle Threshold and Extended Width Component, Milled Aluminum Finish

NGP 355 Half Saddle Threshold 5" Wide x 1/2" Tall Aluminum Alloy with Fluted Top

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Model: 350DKB-36
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$99.75
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NGP 355 Half Saddle Threshold 5" Wide x 1/2" Tall Aluminum Alloy with Fluted Top

Professional Aluminum Threshold Solution

The NGP 355 Half Saddle Threshold delivers professional-grade door transition performance with precision-extruded aluminum alloy 6063, T5 temper construction. Measuring 5" wide x 1/2" tall with a fluted top surface, this threshold component is designed for thermal break applications and meets ADA compliance requirements when properly installed. The .110" typical wall thickness and .83 lbs./ft. weight provide optimal strength-to-weight performance for commercial installations.

Professional Features & Benefits

  • Precision Dimensions: 5" wide x 1/2" tall profile designed for standard door applications with extended width coverage.
  • Heavy-Duty Construction: Aluminum alloy 6063, T5 temper provides exceptional durability and corrosion resistance for long-term performance.
  • ADA Compliant Design: Meets accessibility requirements when installed with non-beveled edge flush with flooring or where no greater than 1/4" vertical rise occurs.
  • Thermal Break Ready: Specifically designed for thermal break applications to enhance energy efficiency in commercial installations.
  • Fluted Top Surface: Textured surface provides enhanced traction and slip resistance for pedestrian safety.
  • Complete Installation Hardware: Includes #10 x 1-1/2" FH zinc plated wood screws for secure mounting (dark bronze screws supplied with DKB thresholds).
  • Lightweight Efficiency: .83 lbs./ft. weight with .110" typical wall thickness optimizes material usage while maintaining structural integrity.
  • Finish Options: Available in mill finish standard with optional slip resistant SIA finish for enhanced safety 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 threshold products deliver professional-grade reliability with precision-extruded aluminum alloy 6063, T5 temper construction rated at .83 lbs./ft. for optimal performance. The fluted top design and ADA compliant profile ensure both safety and accessibility compliance. Engineered for demanding commercial applications where dependable performance and thermal efficiency 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 350DKB-36 – Frequently Asked Questions

1) Will the NGP 355 threshold meet ADA requirements for an accessible entrance?
The 355 half saddle is ADA compliant when the non-beveled edge sits flush with the flooring, or where the vertical rise it creates is no greater than 1/4 inch. The extrusion itself stands 1/2 inch tall, so dropping it on top of finished floor on both sides leaves a 1/2 inch step and puts you outside that 1/4 inch limit. Plan the installation so the threshold picks up a floor level change, or recess it into the finish.
2) Do mounting screws come with the NGP 355 threshold or do I need to buy fasteners?
Fasteners are in the box. Each 355 ships with #10 x 1-1/2 inch flat head zinc plated wood screws, and the dark bronze version ships with dark bronze screws so the heads do not stand out against the finish. Those are wood screws, so if you are anchoring into concrete you will need your own sleeve or lead anchors sized to a #10 screw.
3) My existing threshold is only 1/4 inch tall. What replaces it without creating a trip edge?
Do not drop the 355 into that spot. At 1/2 inch tall it will sit twice as proud as what you pulled out, and unless the floor on one side drops to meet it you have created a rise the ADA limit does not allow. The Pemko 272 Series is the closer swap, a flat saddle threshold at 1/4 inch by 6 inches in heavy duty aluminum, ADA compliant. Match height first, then width.
4) The opening needs the lowest possible rise at the sill for wheelchair traffic - what should I use instead of the NGP 355?
The NGP 355 stands 1/2 inch tall, and it is described as meeting accessibility requirements when the non-beveled edge is installed flush with the flooring or where no greater than a 1/4 inch vertical rise occurs, which means the surrounding floor build-up has to do part of the work. Where you cannot bury the saddle in the floor and need the change in level to come from the part itself, the Pemko 272 series is a flat saddle threshold at 1/4 inch by 6 inches in heavy-duty aluminum and is described as ADA compliant. The Cal-Royal CR2000 saddle threshold series is also described as ADA compliant. A property manager retrofitting an existing slab, where nothing is being recessed, will usually find the flat 1/4 inch profile the easier approach at that door.
5) What is a half saddle threshold and when do I use one instead of a full saddle?
A half saddle carries a single sloped or flat face rather than the two-sided hump of a full saddle. The NGP 355 runs 5 inches wide by 1/2 inch tall, so it covers a wide gap on one side of the opening, which is what you want at a floor transition, at a thermal break in an aluminum entrance, or where the door swings over a finish change. If you need a symmetrical rise on both sides for an interior opening with equal floor heights, a full saddle profile is the better fit.
6) What finishes is the NGP 355 aluminum threshold available in?
Two finishes, mill aluminum and dark bronze, and both are offered in all four lengths (36, 48, 72, and 84 inches). Mill is the raw extruded aluminum look that matches most storefront and commercial door frames. Dark bronze is the one to pick when the frames are anodized bronze and you do not want a bright band across the opening. There is also a slip resistant SIA finish option on the 355 for wet entrances.
7) Can I cut the NGP 355 threshold down to fit my opening?
Yes. It is a 6063 T5 aluminum extrusion in fixed 36, 48, 72, and 84 inch lengths, so you buy the next size up and cut to the frame with a miter saw and a non-ferrous blade. Order the length above your opening rather than below it, then drill and countersink for the supplied #10 screws once it is dry fit in place.
8) Will a 5 inch wide threshold cover the gap under an aluminum storefront door with a thermal break?
That is the case the 355 is built for. The 5 inch width gives you coverage well past the door face on one side, which is what a thermal break detail needs so the threshold spans the break instead of stopping short of it. On a standard commercial opening that width also lets you land fasteners clear of the frame anchors below.
9) Can I use a Cal-Royal CR2000 or CR3700 threshold in place of an NGP 355?
They are all saddle thresholds for a commercial door sill, so they compete for the same opening, but they are not the same part and they are not drop-in for one another. The NGP 355 is a specific half saddle extrusion, 5 inches wide by 1/2 inch tall with a fluted top, sold in fixed 36, 48, 72 and 84 inch lengths in mill aluminum or dark bronze. The Cal-Royal CR2000 and CR3700 are threshold series rather than single profiles, the CR2000 described as fire rated and ADA compliant and the CR3700 with a 3-hour positive pressure fire rating. If you are standardizing across a facility on the NGP 355 profile, or the sill is already cut for a 5 inch saddle, swapping in a different series means confirming the width, the height and the anchor pattern at the opening first.
10) Which saddle threshold has a slip resistant walking surface, the NGP 355 or the alternatives?
The NGP 355 has a fluted top surface, a texture intended to add traction and slip resistance underfoot, and it is also offered with an optional slip resistant SIA finish alongside the standard mill finish. The Pemko 272 series is a flat saddle threshold in heavy-duty aluminum at 1/4 inch by 6 inches, and its identity is the flat profile rather than a textured one. For an entrance that gets wet - a school vestibule, a hospitality entry, a warehouse man door off a wash area - the fluted top and the SIA option are the reason to specify the 355 over a plain flat saddle.
11) Is the fluted top on this threshold enough for slip resistance in a wet lobby entrance?
The fluted top of the 355 is a textured extruded surface that adds traction underfoot, and for most interior and covered commercial openings that is what gets specified. Where the entrance takes standing water or snowmelt, the 355 is also offered with an optional SIA slip resistant finish, an abrasive surface rather than just the flutes. Healthcare, school, and retail entrances are where that upgrade earns its place.
How fast can I get the NGP 350DKB-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 350DKB-36 come with a warranty?
Absolutely. The NGP 350DKB-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 350DKB-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 350DKB-36 from ZenSupply?
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