Zero International 548 Saddle ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$181.00
$164.59
Zero 548 8" x 1/4" Saddle Threshold Black Finish

Zero International 548 Saddle Threshold, 8" x 1/4", Black Finish, Fire-Rated

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Model: 548BK36

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

$181.00
$164.59
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Zero International 548 Saddle Threshold, 8" x 1/4", Black Finish, Fire-Rated

The Zero International 548 Saddle Threshold is engineered to stand up to the demands of heavy traffic openings and those with extreme temperature differentials. Measuring 8" W x 1/4" H and finished in Black, this heavy-gauge threshold allows direct drilling and screwing into concrete without the buckling or loose-screw issues common with lighter commercial materials. It is ADA Compliant, Fire-Rated up to 3 Hours, and meets ANSI/BHMA J32100 and J32130 standards, making it a dependable choice for commercial door openings requiring both durability and code compliance.

Key Features

  • Precise Dimensions: 8"W x 1/4"H profile designed for accurate fit and consistent transition across heavy-traffic thresholds.
  • Heavy-Gauge Construction: Robust material allows direct drilling and screwing into concrete without buckling under heavy loads or developing loose screws over time.
  • Fire-Rated Protection: Rated up to 3 Hours, supporting installations in openings with fire-rated code requirements.
  • ADA Compliant Design: Low-profile 1/4" height helps meet accessibility requirements for barrier-free thresholds.
  • Black Finish: Durable Black finish provides a clean, consistent appearance suited to a range of door and frame finishes.
  • Temperature Differential Resistance: Built to withstand openings subject to extreme temperature swings without compromising performance.

Certifications & Compliance

  • ANSI/BHMA J32100, J32130
  • ADA Compliant
  • Fire-Rated up to 3 Hours

Technical Specifications

  • Product Group: Door Trim and Accessories
  • Product Subgroup: Door Thresholds
  • Product Height: 1/4"
  • Product Width: 8"
  • 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 548?

Zero International threshold products deliver professional-grade reliability with heavy-gauge construction rated to withstand heavy traffic and extreme temperature differentials without buckling or loosening. Backed by ANSI/BHMA J32100 and J32130 compliance, ADA accessibility, and a 3-Hour Fire Rating, the 548 Saddle Threshold is engineered for demanding commercial applications where dependable, code-compliant performance is essential.

Manufacturer Resources

Zero Full Line Catalog

Product Specs

Product Group:
Door Trim and Accessories
Product Subgroup:
Door Thresholds
Product Type:
Thresholds
Commercial/Residential:
Commercial
Product Height:
1/4"
Product Width:
8"
Department:
Door Hardware

Zero International 548BK36 – Frequently Asked Questions

1) Will the Zero 548 saddle threshold meet ADA requirements for a barrier-free opening?
At 1/4 inch high, the 548 saddle sits under the 1/2 inch maximum ADA allows for a threshold at an accessible doorway, and Zero states it as ADA compliant. That low profile is also why it works as a transition across a heavy-traffic opening without a bevel becoming a trip point.
2) Can the Zero 548 threshold be used on a fire-rated door opening?
Yes. The 548 saddle threshold is fire rated up to 3 hours, so it can go under a rated opening in a stair, corridor, or tenant separation. It also meets ANSI/BHMA J32100 and J32130, which is the citation a facilities spec or submittal usually wants.
3) What lengths does the Zero 548 saddle threshold come in, and which one do I need for a standard door?
Two lengths: 36 inches and 72 inches. The 36 inch covers a single 3-0 door leaf with no cutting. The 72 inch is what you take for a pair of doors, or when you want to cut down to a non-standard frame width. Order by the frame opening, not the door leaf, since the threshold runs the full width of the frame rabbet.
4) Is the Pemko 61 an interchangeable substitute for a Zero International 548 saddle threshold?
No, they do different jobs at the opening. The Zero International 548 is a saddle threshold with an 8 inch width and a 1/4 inch height that lays across the sill as the finished walking surface, and it is offered in 36 inch and 72 inch lengths. The Pemko 61 is a 61 Series interlocking J hook threshold accessory in steel construction at 36 inch, an accessory piece that interlocks with a door bottom rather than a standalone saddle plate. If the walking surface itself is being replaced, the 548 is the saddle; the Pemko 61 addresses the door-to-threshold interlock instead.
5) Can the Zero 548 threshold be fastened directly into a concrete floor slab?
That is what the heavy-gauge section is for. The 548 takes direct drilling and screwing into concrete without buckling under the fastener or working the screws loose over time, which is the usual failure on lighter thresholds at an exterior slab. Anchors and fasteners are not part of the threshold, so pull them separately for your slab condition.
6) Will one saddle threshold hold up under a high-traffic entrance with big temperature swings?
The 548 is built for exactly that pair of conditions: heavy traffic openings and openings with extreme temperature differentials, where a lighter threshold cups or loosens as the material moves. It is a commercial-grade part, not a residential one.
7) Does the Zero 548 seal the door bottom, or do I still need a sweep or door bottom?
A saddle threshold is the floor member only. It gives the door bottom something flat and level to close against and carries the transition across the opening. It has no seal element of its own, so if you are stopping air, water, or light at the bottom of the leaf, you still order a door bottom or sweep to work against it.
8) What is the difference between the Zero 548 saddle and a Pemko interlocking J hook threshold?
Different jobs. The 548 is a flat saddle that lays across the opening and screws down, and is the part you specify when you want a simple, low, code-compliant transition. The Pemko 61 Series is an interlocking J hook threshold accessory in steel, 36 inches, which is a hook member that engages a mating door bottom rather than a standalone saddle. If your door bottom is an interlocking type, the J hook is what mates with it; if it is a sweep or a flat door bottom, the saddle is the right member.
9) For a 36 inch commercial opening, what is the difference between ordering a Zero 548 and a Pemko 61 threshold part?
Both are made for 36 inch openings, but they are different pieces of the assembly. The Zero 548 at 36 inch is a saddle threshold, 8 inches wide and 1/4 inch high, heavy-gauge so it can be drilled and screwed directly into concrete, and it carries ADA compliance, a fire rating up to 3 hours, and ANSI/BHMA J32100 and J32130. The Pemko 61 is a 36 inch interlocking J hook threshold accessory of steel construction. A buyer replacing the sill plate on a fire-rated barrier-free opening is buying the saddle; a buyer adding an interlocking hook detail to a door bottom is buying the accessory.
10) Does the Zero 548 threshold come in anything besides black?
Black is the finish on the 548 as offered, in 36 inch and 72 inch lengths. Black reads consistently against dark frames and hides scuffing at a traffic threshold better than a bright mill finish, which is a practical point if you are standardizing entries across a building.
How fast can I get the Zero International 548BK36 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 548BK36 come with a warranty?
Absolutely. The Zero International 548BK36 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 548BK36?
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 548BK36 from ZenSupply?
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