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NGP 424E Saddle Threshold Mill Aluminum 1/2" x 4" with Fluted Top
Professional Door Threshold Solution
The NGP 424E Saddle Threshold delivers professional-grade door transition performance with precision-extruded aluminum alloy 6063, T5 temper construction. Measuring 1/2" tall by 4" wide with a fluted top surface, this threshold provides reliable door sealing and smooth transitions for commercial applications. The mill aluminum finish offers durability and corrosion resistance, while the typical wall thickness of .109" ensures structural integrity at just .60 lbs./ft.
Professional Features & Benefits
- Precision Dimensions: 4" wide x 1/2" tall profile designed for standard door applications with optimal clearance and sealing performance.
- Heavy-Duty Construction: Aluminum alloy 6063, T5 temper provides exceptional durability and corrosion resistance for long-term commercial use.
- Fluted Top Design: Textured surface enhances traction and safety while maintaining professional appearance.
- Lightweight Profile: At .60 lbs./ft., the threshold offers easy handling and installation without compromising structural strength.
- Complete Installation Hardware: Includes #10 x 1-1/2" FH zinc plated wood screws for secure mounting to various substrates.
- Multiple Finish Options: Available in mill aluminum, DKB dark bronze/black anodized, and optional SIA slip-resistant finish for enhanced safety applications.
- Optimal Wall Thickness: .109" typical wall thickness provides structural integrity while maintaining cost-effective material usage.
Technical Specifications
- Commercial/Residential: Commercial
- Department: Door Hardware
- Product Category: Door Trim and Accessories
- Product Group: Door Trim and Accessories
- Product Subgroup: Door Thresholds
- Product Type: Thresholds - Saddle
- Series: Saddle Threshold Series
- Subcategory: Thresholds
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 saddle thresholds deliver professional-grade reliability with aluminum alloy 6063, T5 temper construction and precision .109" wall thickness for demanding commercial applications. The fluted top design and multiple finish options including slip-resistant surfaces ensure both safety and aesthetic compatibility. Engineered for dependable performance where door transition integrity is essential.
Manufacturer Resources
NGP Threshold Catalog
Product Specs
- Product Group:
- Door Trim and Accessories
- Series:
- Saddle Threshold Series
- Product Subgroup:
- Door Thresholds
- Product Type:
- Thresholds - Saddle
- Subcategory:
- Thresholds
- Commercial/Residential:
- Commercial
- Product Category:
- Door Trim and Accessories
- Department:
- Door Hardware
NGP 424E-30 – Frequently Asked Questions
1) Does the NGP 424E threshold come with fasteners, or do I need to buy screws separately?
Screws are included: #10 x 1-1/2 inch flat head zinc plated wood screws. Those are sized for wood substrate. If you are setting the saddle on concrete or a slab, plan on your own anchors and sleeves, since the supplied wood screws will not hold in masonry.
2) What is the difference between the NGP 424E saddle threshold and the Pemko 272?
Both are aluminum saddle thresholds, but they sit at different heights and widths. The NGP 424E is a 1/2 inch tall by 4 inch wide extrusion in aluminum alloy 6063, T5 temper with a fluted top surface for traction. The Pemko 272 is a flat saddle threshold at 1/4 inch by 6 inch in heavy-duty aluminum, and it is described as ADA compliant. If the opening needs a wider bearing surface at a lower rise over the finished floor, the 272 profile is the one that matches; if you want the taller 1/2 inch rise on a 4 inch footprint with a fluted walking surface, the 424E is the profile to specify.
3) What lengths does the NGP 424E saddle threshold come in?
Eight cut lengths: 32, 34, 36, 40, 42, 48, 72 and 96 inches. The 32 through 42 inch pieces cover single door openings, 48 inches suits a wide single or an oversize frame, and the 72 and 96 inch lengths are there for pairs of doors and for cutting down on site. Aluminum extrusion cuts clean with a carbide blade, so ordering long and trimming to the frame opening is normal practice.
4) Is a fluted saddle threshold better than a flat one for a high traffic entry?
The 424E has a fluted top, meaning ribs running the length of the extrusion. The ribs give underfoot grip and hide scuffing, which is why fluted saddles get specified for entries that take weather and foot traffic. A flat top saddle, like the Pemko 272 Series, gives a smoother surface for carts and wheeled equipment. For a slip concern beyond what the flutes handle, the 424E can be had with the SIA slip resistant finish.
5) How much of the door frame opening does a 4 inch wide saddle threshold cover?
The 424E measures 4 inches across the width of the opening, so it sits under the door and picks up a little floor on each side of the door face. On a standard 1-3/4 inch commercial door that leaves roughly an inch of saddle showing on each side once the door is centered on it. If you need to cover a wider floor transition or a gap between two flooring types, a 6 inch wide saddle such as the Pemko 272 Series spans more.
6) Can I standardize on the NGP 424E across a whole building's doors?
It is a commercial grade saddle, and the length range from 32 through 96 inches covers single doors, wide singles and pairs, so one part number and one finish can run across a facility's openings. Where it will not standardize is a labeled fire door opening, which needs a rated saddle, and any opening whose door bottom cannot clear the 1/2 inch rise.
7) What is the difference between the Cal-Royal CR2000 and CR3700 saddle thresholds when replacing an NGP 424E?
Both Cal-Royal series are saddle thresholds like the NGP 424E, and they differ in the rating each one carries. The CR2000 series is described as fire rated with an ADA compliant design. The CR3700 series is described with a 3-hour positive pressure fire rating, which is the specific callout to match when a door schedule names a positive pressure rated assembly and a 3-hour duration. Where the sill has no rating requirement, the NGP 424E covers the transition with its 1/2 inch by 4 inch fluted aluminum profile.
8) For an accessible entrance, how does the NGP 424E compare to the ADA compliant saddle thresholds?
The Pemko 272 is described as an ADA compliant flat saddle threshold at 1/4 inch by 6 inch, and the Cal-Royal CR2000 series is described as fire rated with an ADA compliant design - those are the two to put in front of an accessibility reviewer when the sill has to be called out as compliant. The NGP 424E answers a different need at the same opening: a 1/2 inch by 4 inch commercial saddle with a fluted top surface that adds traction underfoot, in mill aluminum, dark bronze/black anodized, or an optional SIA slip-resistant finish.
9) Is the NGP 424E the same thing as a flat saddle threshold?
No. The NGP 424E has a fluted top - a textured walking surface extruded into the top of the profile for traction - on a 1/2 inch tall by 4 inch wide section. The Pemko 272 is specified as a flat saddle threshold, 1/4 inch by 6 inch. If a drawing or a maintenance spec calls for a flat saddle, the fluted surface of the 424E is a visible and tactile difference at the sill, so confirm which surface the job wants before ordering.
10) We are standardizing thresholds across a portfolio of doors - can one saddle threshold cover openings from single doors to wide pairs?
The NGP 424E runs in 32, 34, 36, 40, 42, 48, 72, and 96 inch lengths, so a single 1/2 inch by 4 inch fluted aluminum profile covers single leaves through pair and storefront widths, and it can be ordered in mill aluminum or DKB dark bronze/black anodized to match existing sills. Where individual openings carry a rating requirement that the rest of the portfolio does not, the Cal-Royal CR2000 series is described as fire rated and ADA compliant and the CR3700 series as 3-hour positive pressure fire rated, so those openings can be covered separately without changing the profile family used everywhere else.
11) What finishes is the NGP 424E saddle threshold available in?
Mill aluminum is the standard finish, which is the raw extruded aluminum look. NGP also offers DKB dark bronze/black anodized for openings where the hardware is dark, and SIA slip resistant as an option on top of either. Mill aluminum is the usual choice when the saddle is going under an aluminum storefront door, since it matches the frame without a special order.
How fast can I get the NGP 424E-30 delivered?
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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 424E-30 come with a warranty?
Absolutely. The NGP 424E-30 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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