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NGP 428E Saddle Threshold Mill Aluminum 1/2" x 8" with Fluted Top
Model: NGP-428E
NGP 428E Saddle Threshold Mill Aluminum 1/2" x 8" with Fluted TopProfessional Door Threshold SolutionThe NGP 428E Saddle Threshold delivers commercial-grade door sealing performance with...
NGP
Starting at
$105.75
$83.01
NGP 429E Saddle Threshold Mill Aluminum 1/2" x 9" with Fluted Top
Professional Door Threshold Solution
The NGP 429E Saddle Threshold delivers commercial-grade door sealing performance with precision-extruded aluminum construction. Measuring 9" wide x 1/2" tall, this threshold features aluminum alloy 6063 with T5 temper for exceptional durability and corrosion resistance. The fluted top design provides enhanced traction while the included vinyl foot seal eliminates the need for caulking to maximize weather resistance.
Professional Features & Benefits
- Precision Dimensions: 9" wide x 1/2" tall profile designed for standard door applications with optimal clearance and sealing performance.
- Heavy-Duty Construction: Aluminum alloy 6063 with T5 temper provides superior strength and corrosion resistance for long-term commercial use.
- Enhanced Traction Design: Fluted top surface improves slip resistance and provides secure footing in high-traffic areas.
- Advanced Weather Sealing: Vinyl foot seal system eliminates caulking requirements while delivering superior weather resistance and moisture protection.
- Professional Installation: Includes #10 x 1-1/2" FH zinc plated wood screws for secure mounting and professional appearance.
- Lightweight Efficiency: 1.42 lbs./ft. weight provides easy handling during installation while maintaining structural integrity.
- 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 manufacturing tolerances. The advanced vinyl foot seal system and optional slip-resistant finish demonstrate NGP's commitment to performance and safety in demanding commercial applications where dependable weather 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 429E-36 – Frequently Asked Questions
1) Will the NGP 429E threshold fit a standard 36 inch door opening?
Yes. The 429E saddle threshold is stocked in 36 inch length, which covers a standard single 3-0 door opening. Longer cuts run 42, 48, 72, 74, 82, 84 and 92 inches, so a pair of doors or a wide storefront opening is covered without splicing. The extrusion is 9 inches wide by 1/2 inch tall, so confirm you have 9 inches of floor between the stops before you order.
2) Do I need to caulk under the NGP 429E threshold to seal it?
No. The 429E ships with a vinyl foot seal that closes the gap between the extrusion and the floor, which is what removes the caulk step on a normal installation. That foot seal is doing the water and air seal along the underside, so set the threshold down onto a clean, flat floor rather than bridging a broken slab.
3) I need a saddle threshold under a fire rated door opening. Is the NGP 429E the right part?
The NGP 429E is a mill aluminum saddle threshold with a fluted top and a vinyl foot seal, built for commercial openings in offices, schools, healthcare, retail, warehouse, multi-tenant residential, and government buildings. If the opening is a rated assembly and the submittal calls for a threshold carried under a fire rating, look at the Cal-Royal saddle threshold series instead: the Cal-Royal CR2000 is a saddle threshold described as fire rated and ADA compliant, and the Cal-Royal CR3700 carries a 3-hour positive pressure fire rating. Match the rating on the door schedule to the threshold series before you order.
4) The existing threshold is a flat saddle with no ribs. Will the NGP 429E drop into the same spot?
Not necessarily. The NGP 429E is a fluted-top saddle at 1/2 inch tall and 9 inches wide, so the ribbed surface and the half-inch rise change both the walking surface and the door bottom clearance compared to a flat saddle. If what is coming out is a flat, low profile saddle, the Pemko 272 Series is the closer match in form: a flat saddle threshold at 1/4 inch by 6 inch in heavy-duty aluminum with an ADA compliant design. Measure the existing width across the sill and the undercut at the door bottom before choosing between the 9 inch fluted profile and the 6 inch flat one.
5) What fasteners come with the NGP 429E saddle threshold?
#10 x 1-1/2 inch flat head zinc plated wood screws are included. Those are wood screws, so they land in a wood sub-floor or wood sill as supplied. Going into concrete, tile or a steel sill means picking up the anchors separately, since nothing in the box is rated for masonry.
6) Should I use a saddle threshold or a flat threshold at an exterior door?
A saddle like the 429E has a raised, ramped profile with a vinyl foot seal underneath, so it is the one to use where weather has to be stopped at the opening. A flat plate threshold, such as the Pemko 272 Series at 1/4 inch by 6 inches, is for interior floor transitions where you only need to cover the joint and keep the rise low. Exterior door with a sweep on it, use the saddle.
7) Can I cut the NGP 429E threshold down to fit my opening?
Yes. It is a 6063-T5 aluminum extrusion with a constant 9 inch by 1/2 inch cross section, so a length cuts cleanly on a miter saw with a non-ferrous blade and the profile is unchanged along the run. Buy the next length up from your opening and trim. The vinyl foot seal trims to match the aluminum.
8) Which threshold length do I order for a pair of doors?
Measure the full clear opening between jambs, both leaves plus any mullion, and take the next length up. The 429E runs to 72, 74, 82, 84 and 92 inches, which covers most double door openings in one piece, so you avoid a seam in the middle of the traffic path where a joint would leak.
9) Which saddle threshold should I standardize on across a facility that has both rated and non-rated exterior doors?
Split it by opening. For non-rated exterior and interior openings, the NGP 429E gives a 9 inch by 1/2 inch mill aluminum saddle with a fluted top for traction and a vinyl foot seal that removes the caulking step, and it runs in lengths from 36 inches up to 92 inches so most door widths and pairs come off one part number. For the rated openings in the same facility, the Cal-Royal CR2000 series is a saddle threshold with a fire rated and ADA compliant design, and the Cal-Royal CR3700 series carries a 3-hour positive pressure fire rating. Buying the 429E for the general openings and a Cal-Royal series for the rated ones keeps the walking surface consistent while still meeting the door schedule.
10) Is the Cal-Royal CR3700 a direct substitute for the NGP 429E?
They are both saddle thresholds, but they are not the same part. The Cal-Royal CR3700 is a saddle threshold series carrying a 3-hour positive pressure fire rating, which is a rated-assembly product. The NGP 429E is a mill aluminum saddle in 6063 alloy with T5 temper, 1/2 inch by 9 inches, with a fluted top and a vinyl foot seal that removes the need to caulk, and it ships with #10 x 1-1/2 inch flat head zinc plated wood screws. Swapping one for the other changes the profile dimensions and the seal method, so confirm the sill width and the opening requirements rather than treating them as interchangeable.
11) Does the NGP 429E come in a finish other than mill aluminum?
Mill aluminum is the finish on the 429E, which is the plain unpainted extrusion most commercial openings take. The one surface option NGP lists on it is the SIA slip resistant treatment for the walking surface, not a color change. Length is the only ordering choice otherwise, from 36 up to 92 inches.
How fast can I get the NGP 429E-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 429E-36 come with a warranty?
Absolutely. The NGP 429E-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 429E-36?
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