Zero International 657A Saddle...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$224.00
$182.55
Zero 657A 7" x 1/2" Saddle Threshold with 223 MSLA-10 Anchor Aluminum Finish

Zero International 657A Saddle Threshold with 223 MSLA-10 Anchor, 7" x 1/2", Aluminum Finish

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Model: 657A-NH 36 223

In Stock (leaves warehouse same day if ordered before 3pm ET)

$224.00
$182.55
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Zero International 657A Saddle Threshold with 223 MSLA-10 Anchor, 7" x 1/2", Aluminum Finish

The Zero International 657A is a heavy-duty saddle threshold measuring 7"W x 1/2"H, extruded from durable 6063 alloy and finished in aluminum. Built to ANSI J32100 standards, this threshold is ADA compliant and fire-rated, making it suitable for demanding commercial doorways subject to heavy foot traffic and extreme temperature differentials. It ships with the 223 MSLA-10 anchor system, and the heavy-gauge construction allows direct drilling and screwing into concrete without the buckling or loosening common with lighter-duty thresholds.

Key Features

  • Threshold Dimensions: 7"W x 1/2"H profile sized for standard commercial door openings.
  • Heavy-Gauge Construction: Extruded from 6063 alloy, allowing direct drilling and screwing into concrete without buckling under heavy loads or loosening over time.
  • Anchor System Included: Supplied with the 223 MSLA-10 anchor for secure, reliable installation.
  • ADA Compliant Design: Low-profile 1/2" height meets ADA accessibility requirements for barrier-free thresholds.
  • Fire-Rated Performance: Fire-rated construction supports use in code-compliant commercial door assemblies.
  • Aluminum Finish: Durable aluminum finish provides a clean, professional appearance suited to a wide range of commercial door installations.
  • Built for Heavy Traffic: Engineered to withstand the demands of high-traffic commercial applications and extreme temperature differentials.

Certifications & Compliance

  • ANSI J32100
  • ADA Compliant
  • Fire-Rated

Technical Specifications

  • Product Group: Door Trim and Accessories
  • Product Subgroup: Door Thresholds
  • Product Width: 7"
  • Department: Door Hardware

Typical Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings

Why Zero International 657A?

Zero International thresholds are engineered from heavy-gauge 6063 alloy extrusions built to meet ANSI J32100 standards, delivering the strength needed for direct concrete installation without buckling or loose screws. The ADA-compliant, fire-rated design of the 657A ensures dependable, code-compliant performance in high-traffic commercial doorways where durability and accessibility are equally essential.

Product Specs

Product Group:
Door Trim and Accessories
Product Subgroup:
Door Thresholds
Product Type:
Thresholds
Commercial/Residential:
Commercial
Product Height:
1/2"
Product Width:
7"
Department:
Door Hardware

Zero International 657A-NH 36 223 – Frequently Asked Questions

1) Will the Zero 657A threshold work for a 36 inch wide door opening?
Yes. The 657A saddle threshold comes in 36 inch lengths, which covers a standard single 3-0 opening. Longer cuts are available at 72, 76, and 78 inches for pairs of doors or wider frames. The profile itself is 7 inches wide across the sill and 1/2 inch high regardless of length.
2) Is a 1/2 inch high saddle threshold ADA compliant?
The 657A rises 1/2 inch, and the description states it is ADA compliant on that basis. Half an inch is the ceiling for a threshold at an accessible doorway, so this one sits right at the limit rather than under it. If your inspector is measuring to the top of the saddle over a finished floor that already sits proud of the slab, the stack height is what will fail you, not the threshold itself.
3) Can the Zero 657 threshold be anchored straight into a concrete slab?
That is what it is built for. The 657A is extruded from 6063 alloy in a heavy gauge that takes direct drilling and screwing into concrete without buckling or working the screws loose the way a lighter thin-wall saddle does. It ships with the 223 MSLA-10 anchor system, so the fastening is accounted for out of the box.
4) Does the Zero 657A threshold come with anchors or do I have to order fasteners separately?
Anchors are included. The 657A is supplied with the 223 MSLA-10 anchor system, so you are not sourcing a separate anchor kit to set it into the slab. What you still want on the truck is your sealant bed under the saddle and a hammer drill with the right bit for the substrate.
5) Can I use the Zero 657A saddle threshold on a fire rated door opening?
Yes. The 657A is fire-rated and built to ANSI J32100, which is what lets it go under a code-compliant commercial door assembly rather than only an interior pass-through. That matters most on stairwell and corridor openings in schools, hospitals, and government buildings where the whole assembly gets inspected as a unit.
6) Is the Pemko 61 an equivalent replacement for the Zero International 657A saddle threshold?
No. The Pemko 61 is an interlocking J hook threshold accessory in steel construction, so it is a companion piece rather than the walking surface itself. The Zero International 657A is the saddle threshold proper, a 7 inch wide by 1/2 inch high aluminum extrusion that spans the opening and carries traffic. If the doorway needs a threshold to walk over, the 657A is the part; if a job calls specifically for a J hook interlock component, that is a different item and does not stand in for a saddle.
7) What is the difference between a 7 inch saddle threshold and a narrow 4 inch one?
Width is about what the saddle has to cover. At 7 inches across, the 657A spans the full sill of a typical commercial frame plus the joint on both sides, which is what you want when the door swings over a concrete stoop and you are transitioning two different floor materials. A narrow saddle only bridges the gap directly under the door. Go wide when you need coverage under the frame throat and a broad bearing surface for foot traffic; go narrow when the sill is shallow and a wide plate would run past the frame into the finished floor.
8) I need to cover a pair of doors. What length Zero 657A threshold should I order?
For a pair, take the 72, 76, or 78 inch cut rather than joining two 36 inch pieces. A saddle threshold seals and wears best as one continuous run, and a seam under the meeting stile of a pair is exactly where water and grit get in. Measure frame throat to frame throat, then pick the next length up and cut to fit on site; aluminum extrusion cuts cleanly with a miter saw and a non-ferrous blade.
9) The Pemko 61 is a 36 inch part - does the Zero 657A cover longer openings?
The Pemko 61 threshold accessory is a 36 inch steel piece. The Zero International 657A saddle threshold is offered at 36 inches to match a standard single door, and also at 72, 76, and 78 inches for pairs, wide leaf openings, and out of swing storefront conditions. On a job where the openings vary, the 657A profile stays the same 7 inch by 1/2 inch aluminum section across all four lengths, so the same threshold detail repeats through the building without changing parts.
10) Will an aluminum threshold hold up in an entrance that goes from air conditioning to outdoor heat?
That temperature swing is one of the conditions the 657A is built for. The description calls out extreme temperature differentials and heavy foot traffic as the intended service, and the 6063 extrusion is dimensionally stable through that cycling in a way a lighter gauge or a composite saddle is not. Standard use is exterior and vestibule openings in offices, retail, warehouses, and multi-tenant residential.
11) Does the Zero 657A threshold match the aluminum finish on my existing storefront doors?
The 657A is finished in mill aluminum, which is the standard match for clear anodized aluminum storefront and hollow metal frames in a commercial entry. Across a building where you are standardizing openings, ordering all saddles in the same 7 inch by 1/2 inch aluminum profile keeps the sight line consistent from door to door, which is the usual reason a property manager replaces a whole run at once rather than one at a time.
How fast can I get the Zero International 657A-NH 36 223 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 Zero International 657A-NH 36 223 come with a warranty?
Absolutely. The Zero International 657A-NH 36 223 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 Zero International 657A-NH 36 223?
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 Zero International 657A-NH 36 223 from ZenSupply?
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