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NGP 425 Aluminum Saddle Threshold 1/2" x 5" with Fluted Top
Professional Door Threshold Solution
The NGP 425 Aluminum Saddle Threshold provides reliable door transition protection with precise 1/2" x 5" dimensions for commercial applications. Constructed from aluminum alloy 6063 with T5 temper for enhanced durability, this threshold features a fluted top surface and typical wall thickness of .162" for long-lasting performance. At .88 lbs./ft., it offers substantial construction while remaining manageable for installation.
Professional Features & Benefits
- Precise Dimensions: 1/2" tall x 5" wide profile provides optimal door clearance and weather protection for standard commercial applications.
- Heavy-Duty Construction: Aluminum alloy 6063 with T5 temper delivers exceptional durability and corrosion resistance for demanding environments.
- Fluted Top Design: Textured surface provides enhanced traction and slip resistance for improved safety in high-traffic areas.
- Professional Wall Thickness: Typical .162" wall thickness ensures structural integrity and long-term performance under heavy use.
- Complete Installation Package: Includes #10 x 1-1/2" FH zinc plated wood screws for secure mounting and professional installation.
- Lightweight Yet Durable: At .88 lbs./ft., provides substantial construction while remaining easy to handle during installation.
- Multiple Finish Options: Available in Aluminum Mill finish and DKB Dark Bronze, with optional SIA slip-resistant finish for hazardous conditions.
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 rated for demanding commercial applications. The fluted top design and optional slip-resistant finish provide enhanced safety features where conditions can be hazardous and safety is a priority. Engineered for long-term performance with included professional-grade mounting hardware for dependable installation.
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 425-36 – Frequently Asked Questions
1) Will the NGP 425 saddle threshold work under a door that swings over it, or is 1/2 inch too tall?
The 425 stands 1/2 inch tall across a 5 inch wide profile, so the door bottom has to clear a half inch above the finished floor. That is the usual saddle height for a commercial opening where the door swings over the threshold. If the existing undercut is tighter than that, a lower profile flat saddle like the Pemko 272 Series at 1/4 inch by 6 inches is the one to look at instead.
2) What lengths does the NGP 425 threshold come in, and can I cut it down to my door width?
Five stock lengths: 36, 42, 48, 72 and 84 inches, in both Mill Aluminum and Dark Bronze. For a standard 36 inch single door the 36 inch piece is a direct fit. The 72 and 84 inch pieces cover pairs of doors and double egress openings in one run. It is extruded 6063-T5 aluminum, so it cuts cleanly on a miter saw with a non-ferrous blade when you need to trim to a jamb-to-jamb dimension.
3) Does the NGP 425 threshold come with fasteners, or do I need to buy screws separately?
Screws are in the box. Each 425 threshold ships with #10 x 1-1/2 inch flat head zinc plated wood screws, which is what you want over a wood subfloor or a wood sill. Over concrete you will need to supply your own anchors and masonry fasteners, since the included wood screws will not hold in slab.
4) Which saddle threshold has the lowest rise for a wheelchair accessible entrance?
The Pemko 272 Series is the flattest of the group at 1/4 inch by 6 inch and is an ADA compliant flat saddle threshold in heavy-duty aluminum. The Cal-Royal CR2000 saddle threshold series is also ADA compliant. The NGP 425 rises 1/2 inch over a 5 inch width and uses a fluted top surface for traction. On an accessible route the 1/4 inch flat profile is the one to check against the drawing first, since it needs no bevel to meet the floor.
5) What is the fluted top on this aluminum saddle threshold for?
The flutes are a traction surface. A smooth mill aluminum saddle gets slick underfoot when it is wet, and a threshold sits right where people track water in. The ribbing on the 425 breaks that up. Where conditions are genuinely hazardous, wet kitchens, pool decks, entries in freeze climates, NGP offers the SIA slip-resistant finish on this threshold as an option.
6) Which finish should I order to match dark bronze storefront and aluminum doors?
Two finishes are stocked on the 425: Mill Aluminum, which matches clear anodized aluminum storefront and standard hollow metal, and DKB Dark Bronze for dark bronze anodized frames and entrances. Both are offered in all five lengths, so a property manager standardizing across a building can pick one finish and order every opening from it.
7) Can one NGP 425 threshold cover a pair of doors?
Yes, on a pair. The 84 inch length runs continuously under a pair of 3 foot doors plus the frame, and the 72 inch covers a pair of narrower leaves. Running one unbroken piece across the opening beats butting two shorter pieces at the meeting stile, since the seam is where water and dirt get under a saddle.
8) Cal-Royal CR2000 vs CR3700 - which one matches an NGP 425 saddle threshold?
Neither is a dimensional match, and the two Cal-Royal series differ from each other. The Cal-Royal CR2000 saddle threshold series is fire rated and ADA compliant; the Cal-Royal CR3700 saddle threshold series carries a 3-hour positive pressure fire rating. The NGP 425 is a 1/2 inch by 5 inch aluminum saddle threshold with a fluted top in 6063 T5 temper, sold in 36, 42, 48, 72 and 84 inch lengths in Mill Aluminum and Dark Bronze. If you are replacing an existing 425 and the opening is not rated, stay with the same 1/2 inch by 5 inch profile so the door bottom clearance and the existing screw pattern still work.
9) What should I use instead of the NGP 425 if the door bottom clearance is too tight for a 1/2 inch threshold?
Drop to a flatter profile. The Pemko 272 Series is a flat saddle threshold at 1/4 inch by 6 inch in heavy-duty aluminum, which halves the rise at the sill while giving a wider bearing surface across the opening. The NGP 425 needs 1/2 inch of clearance under the door leaf for its 5 inch wide profile. Check the undercut on the existing leaf before ordering: if the door was hung for a flat threshold, the 1/4 inch profile is the one that will close without planing the bottom rail.
How fast can I get the NGP 425-36 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
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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 425-36 come with a warranty?
Absolutely. The NGP 425-36 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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