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NGP 428E Saddle Threshold Mill Aluminum 1/2" x 8" with Fluted Top
Professional Door Threshold Solution
The NGP 428E Saddle Threshold delivers commercial-grade door sealing performance with precision-extruded aluminum alloy 6063, T5 temper construction. Measuring 1/2" tall by 8" wide with a fluted top surface for enhanced traction, this threshold features typical wall thickness of .109" and weighs 1.20 lbs./ft. The integrated vinyl foot seal provides superior weather resistance compared to traditional caulking methods, making it ideal for demanding commercial applications.
Professional Features & Benefits
- Precision Dimensions: 8" 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.
- Enhanced Safety Design: Fluted top surface provides improved traction and slip resistance in high-traffic areas.
- Superior Weather Sealing: Integrated vinyl foot seal delivers enhanced weather resistance compared to traditional caulking methods.
- Professional Installation: Includes #10 x 1-1/2" FH zinc plated wood screws for secure mounting and professional appearance.
- Lightweight Efficiency: At 1.20 lbs./ft., provides optimal strength-to-weight ratio for easy handling and installation.
- Optional Safety Enhancement: SIA slip-resistant finish available for hazardous conditions where safety is a priority.
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 threshold products deliver professional-grade reliability with aluminum alloy 6063, T5 temper construction and precision .109" wall thickness for demanding commercial applications. The integrated vinyl foot seal and fluted top design provide enhanced weather resistance and safety performance where dependable sealing 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 428E-36 – Frequently Asked Questions
1) What door widths does the NGP 428E saddle threshold cover, and can I cut it down?
The 428E ships in eight stock lengths: 36, 42, 44, 48, 60, 72, 84 and 96 inches. The 36 inch covers a standard single opening, the 72 and 84 inch lengths are what you order for a pair of doors, and 96 inches gives you room to cut for an odd frame width. It's extruded 6063-T5 aluminum, so it cuts clean with a miter saw and a non-ferrous blade.
2) How much will the NGP 428E threshold raise the floor at my door, and will the door still clear it?
The 428E stands 1/2 inch tall and spans 8 inches across the opening. That half inch is the undercut your door needs to swing over, so measure from the finished floor to the bottom of the door before you order. Doors already trimmed for carpet or a thicker saddle will clear it; a door hung tight to a bare slab usually needs the bottom trimmed. The 8 inch width is the part people underestimate, it takes up real floor on both sides of the stop, so confirm you have that much flat, level substrate.
3) Does the NGP 428E threshold come with fasteners, or do I need to buy anchors separately?
Screws are in the box: #10 x 1-1/2 inch flat head zinc plated wood screws. Those are wood screws, so they land in a wood subfloor or a wood sill. If you're setting this into concrete you'll need to supply your own masonry anchors and matching drill bit, since the supplied fasteners won't hold in slab.
4) What's the difference between the NGP 428E saddle and a flat saddle threshold like the Pemko 272?
Height and width are the difference that decides it. The 428E is a 1/2 inch tall by 8 inch wide fluted saddle with a vinyl foot seal, so it's the choice when you want a sealed exterior opening and have the floor space for a wide plate. The Pemko 272 Series is a flat saddle at 1/4 inch by 6 inch, so it's lower and narrower, which is what you want on an interior transition or where a taller saddle would create a trip lip against existing flooring. Pick the 428E for weather sealing at an exterior door, the 272 for a low, tight transition.
5) I need an ADA compliant threshold for an accessible entrance. Is the 428E the right saddle?
When the spec explicitly calls for an ADA compliant threshold, buy one published as such rather than reading a height off a profile. Of the saddle thresholds ZenSupply carries, the Cal-Royal CR2000 Series is published as ADA compliant, and the Pemko 272 Series is published as an ADA compliant flat saddle at 1/4 inch by 6 inch. The 428E at 1/2 inch tall is the standard commercial weather saddle and is what goes on openings where accessible-route compliance isn't the governing requirement.
6) Do I still need to caulk under an NGP 428E saddle threshold?
The 428E carries an integrated vinyl foot seal along the underside, which is what NGP puts in place of a bead of caulk for weather resistance. That's the seal doing the work at the floor line, so you're not depending on a caulk joint that has to be recut every few years. Set it flat on a clean, level substrate so the foot seal makes continuous contact.
7) Is the top of the NGP 428E threshold slippery when wet, and is there a non-slip version?
The top face is fluted, meaning ribbed across the walking surface, which is what gives it traction on an 8 inch wide plate of bare aluminum. For wet entries, loading docks, pool decks or anywhere you're worried about a slip claim, NGP offers the 428E with an SIA slip-resistant finish as an option. Specify SIA when you order if the opening warrants it.
8) Can one 428E threshold run under a pair of doors?
Yes, run it continuous. The 84 and 96 inch lengths cover a standard pair without a joint under the astragal, and a continuous run is what you want, since a seam in the middle of a pair is exactly where water and air find their way in. Measure frame-to-frame at the sill, not door width, then cut the next length up to fit.
9) What is the difference between the Cal-Royal CR2000 and CR3700 saddle thresholds when I am cross-referencing against an NGP 428E?
Both are Cal-Royal saddle thresholds. The CR3700 is a 3-hour positive pressure fire rated design, while the CR2000 is a fire rated and ADA compliant design, so the CR2000 is the one that also addresses the accessible sill height and the CR3700 is the one called out by the 3-hour positive pressure requirement. The NGP 428E sits outside both of those as a weather-sealing saddle: 1/2 inch by 8 inch mill aluminum, fluted top, vinyl foot seal in place of caulking at the sill. Cross-reference on what the opening requires, since these three are not interchangeable on rating.
10) Is the Pemko 272 a drop-in replacement for an NGP 428E we are pulling out?
No. The NGP 428E is 1/2 inch tall and 8 inches wide with a fluted top and an integrated vinyl foot seal; the Pemko 272 is a flat saddle at 1/4 inch by 6 inches. Swapping one for the other changes both the width of the aluminum sitting on the sill and the height the door bottom sees, so the door bottom sweep or shoe clearance set for the 428E will not close the same gap over a 272, and the anchor pattern will land on different substrate. Treat it as a different threshold detail, not a like-for-like exchange. If you are standardizing a building on one profile, pick the profile first and run it across the openings.
11) What finish does the NGP 428E threshold come in?
Mill aluminum, which is the raw extruded finish, silver-grey and unanodized. It's the standard commercial look for a saddle and it wears to a matte tone with traffic rather than showing coating wear the way a painted threshold does. If you're matching existing thresholds in a building, mill aluminum blends with most aluminum entrance work.
12) I'm standardizing thresholds across a portfolio of buildings. How many 428E lengths do I need to stock?
Four sizes cover most of what a property manager runs into: 36 inch for standard single exterior doors, 48 inch for wider singles, and 72 or 84 inch for pairs. The 42, 44, 60 and 96 inch lengths fill in odd frames and give cutting stock. Because every length is the same 1/2 inch by 8 inch mill aluminum profile with the same fluted top and vinyl foot seal, they all look identical across openings once installed, which is what matters when tenants see two doors side by side.
13) I need a threshold for an 84 inch wide opening - does the NGP 428E cover it or do I need a different series?
The NGP 428E is stocked in 36, 42, 44, 48, 60, 72, 84 and 96 inch lengths, so an 84 inch opening is covered without cutting. That length range is one of the reasons to stay with the 428E on wide and paired openings rather than moving to a narrower flat saddle such as the Pemko 272 at 1/4 inch by 6 inches, which is a different profile entirely. Confirm the finished opening width at the sill, not the door leaf width, before you pick the length.
How fast can I get the NGP 428E-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 428E-36 come with a warranty?
Absolutely. The NGP 428E-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 428E-36?
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selection,
installation tips, and troubleshooting. Contact Us
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