You may also like
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 Aluminum Thermal Break Saddle Threshold 5-1/8" x 1/2" with Fluted Top
Professional Thermal Break Door Threshold Solution
The NGP 8425 Aluminum Thermal Break Saddle Threshold delivers superior energy efficiency with its rigid thermoplastic spline design that prevents temperature transfer and frost formation. Constructed from aluminum alloy 6063 with T5 temper, this 5-1/8" wide x 1/2" tall threshold features a fluted top surface for enhanced traction and durability. The .110" typical wall thickness and .90 lbs./ft. weight provide robust performance for commercial door applications.
Professional Features & Benefits
- Thermal Break Technology: Rigid thermoplastic spline creates separation to prevent outside temperature transfer and frost formation through the threshold.
- Precision Dimensions: 5-1/8" wide x 1/2" tall profile with .110" typical wall thickness for consistent installation and performance.
- Heavy-Duty Construction: Aluminum alloy 6063 with T5 temper provides exceptional durability and corrosion resistance for long-term commercial use.
- Enhanced Traction: Fluted top surface design improves slip resistance and provides secure footing in high-traffic applications.
- Complete Installation Package: Includes #10 x 1-1/2" FH zinc plated wood screws for immediate installation readiness.
- Lightweight Design: At .90 lbs./ft., the threshold provides strength without excessive weight for easier handling and installation.
- Professional Mill Finish: Clean aluminum mill finish provides versatile appearance suitable for various architectural applications.
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 thermal break technology. The rigid thermoplastic spline design ensures consistent energy efficiency performance while the fluted top surface provides enhanced safety and durability. Engineered for demanding commercial applications where dependable performance and energy efficiency are essential.
Manufacturer Resources
NGP Threshold Catalog
Product Specs
- Product Group:
- Door Trim and Accessories
- Series:
- Saddle Threshold Series
- Product Subgroup:
- Door Thresholds
- Product Type:
- Threshold - Saddle
- Subcategory:
- Thresholds
- Commercial/Residential:
- Commercial
- Product Category:
- Door Trim and Accessories
- Department:
- Door Hardware
NGP 8425 36 – Frequently Asked Questions
1) What does the thermal break in the NGP 8425 threshold actually do?
A rigid thermoplastic spline runs through the aluminum extrusion and splits the interior half of the threshold from the exterior half. Aluminum conducts heat fast, so without that separation the outside temperature travels straight through the saddle and you get condensation or frost forming on the inside edge in cold weather. The 8425 uses the spline to stop that transfer. If you're doing an exterior opening in a heating climate, that's the reason to pick this over a plain solid saddle.
2) How wide and how tall is the NGP 8425 saddle threshold?
The profile is 5-1/8 inches wide by 1/2 inch tall. That half-inch height matters for door clearance: undercut the door so the bottom sweeps or clears the high point of the saddle, and plan the width so the threshold sits under the door with the break landing at the door's centerline or just inboard of the stop.
3) Do I get fasteners with the NGP 8425 threshold or do I need to buy anchors separately?
#10 x 1-1/2 inch flat head zinc plated wood screws ship with it. Those work into a wood sub-sill or wood framing. If you're setting this on concrete or a masonry sill, the supplied screws won't hold and you'll need to pick up sleeve anchors or screw anchors with a matching flat head to sit flush in the countersunk holes.
4) Can I use the NGP 8425 saddle on a fire rated opening?
If the opening carries a fire rating, spec a threshold that states one. Cal-Royal's CR3700 Series saddle threshold carries a 3-hour positive pressure fire rating, and the Cal-Royal CR2000 Series is offered as a fire rated and ADA compliant saddle. Either is the safer pick for a rated door than a threshold selected for thermal performance.
5) What length does the NGP 8425 threshold come in, and can I cut it down?
It's supplied in a 36 inch length, which covers a standard single commercial opening. Aluminum 6063-T5 cuts cleanly with a miter saw and a non-ferrous blade, so trimming to the exact frame-to-frame dimension is normal practice. Cut from one end, deburr, and re-drill your anchor holes rather than relying on the factory spacing.
6) I need a flat saddle threshold instead of a fluted thermal break one. What else is there?
For a low flat profile, the Pemko 272 Series is a 1/4 inch x 6 inch heavy-duty aluminum saddle with an ADA compliant flat design. It is wider and much lower than the NGP 8425's 5-1/8 x 1/2 inch fluted profile, which makes it the choice where you need a minimal rise across the opening rather than a thermal break.
7) Is the NGP 8425 threshold suitable for an interior door, or is it meant for exterior openings?
The thermal break only earns its keep where there's a temperature difference across the door, so this is an exterior-opening product. On an interior opening you're paying for a spline that does nothing. A plain saddle, or a flat low-profile saddle like the Pemko 272 Series, covers an interior transition just as well.
8) What is the difference between the Cal-Royal CR2000 and CR3700 saddle thresholds when I am replacing an NGP 8425?
Both are Cal-Royal saddle thresholds. The CR2000 Series is described as fire rated with an ADA compliant design, while the CR3700 Series is specified with a 3-hour positive pressure fire rating, which is the tighter call-out when a positive pressure test standard is named on the submittal. Neither is a like-for-like swap for the NGP 8425, which is a thermal break unit: the 8425 uses a rigid thermoplastic spline through the aluminum extrusion to stop outside temperature transfer, a feature aimed at exterior energy performance rather than at a fire rating. Match the replacement to whichever requirement the opening is actually carrying.
9) What finish does the NGP 8425 threshold come in, and will it match my other door hardware?
Mill finish aluminum, which is the raw silver-grey of the extrusion. It reads close to satin aluminum and sits neutrally against clear-anodized storefront and aluminum frames. It is not a painted or anodized color match, so if your openings are finished in dark bronze or black you'll see a difference at the sill.
How fast can I get the NGP 8425 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 8425 36 come with a warranty?
Absolutely. The NGP 8425 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 8425 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 8425 36 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.