Zero 625A 5" X 1/2" Full Body Strength Utility Threshold With Thermal Break
Zero thresholds are designed to stand up to the demands of heavy traffic openings and those with extreme temperature differentials. The heavy-gauge material allows you to drill and screw our thresholds directly into concrete without the difficulties common when using lighter commercial materials, such as buckling under heavy loads or loose screws.
- Full Body Strength Utility Threshold
- Material: Aluminum
- Length: 96"
- Width: 5"
- Height: 0.5"
- Thickness: 0.135"
- Handicap Accessibility
- Features: Aluminum composite filler containing aluminum oxide and silicone carbide.
- Application: Ideal for heavy commercial traffic in supply rooms, manufacturing buildings, schools, cafeterias, automobile dealers, hospitals, industrial facilities.
- Thermal Break: One PVC Thermal Break
Manufacturer Resources
zero thresholds 625 data sheet
Product Specs
- Product Group:
- Door Trim and Accessories
- Product Subgroup:
- Door Thresholds
- Product Type:
- Threshold
- ADA Accessible:
- Yes
- Commercial/Residential:
- Commercial
- Product Finish:
- Aluminum Mill
- Performance Rating:
- Fire Rated-UL10c
- Product Height:
- 1/2"
- Product Width:
- 5"
- Department:
- Door Hardware
Zero International 625A 36 – Frequently Asked Questions
1) Will the Zero 625A threshold work in a heavy traffic commercial doorway like a school cafeteria or loading area?
That is exactly what the 625A is built for. It's a full body strength utility threshold in aluminum, 0.135 inch wall thickness, with an abrasive filler of aluminum oxide and silicone carbide worked into the walking surface for traction. The heavy gauge lets you drill and anchor straight into concrete without the buckling or loosening screws you get from lighter commercial extrusions. Zero calls out supply rooms, manufacturing buildings, schools, cafeterias, auto dealers, hospitals and industrial facilities.
2) Is the Zero 625A threshold ADA compliant at 1/2 inch high?
Yes. The 625A stands 1/2 inch tall and is listed as ADA accessible. A half inch is the maximum change in level ADA allows at a doorway, and it has to be beveled above 1/4 inch, so this profile sits right at the ceiling of what an accessible opening permits. Nothing taller will pass without a ramp.
3) Can I use the Zero 625A on a fire rated door opening?
Yes. The 625A carries a UL10c fire rating, so it can go under a fire rated door assembly. That matters for stair doors, corridor cross doors and any rated separation where an unrated threshold would void the assembly.
4) Can the Pemko 61 be used in place of the Zero 625A threshold?
No, they are different kinds of parts. The Pemko 61 is an interlocking J hook threshold accessory built in steel and supplied in a 36 inch length, so it is a companion piece that hooks into a threshold assembly rather than the saddle itself. The Zero 625A is the threshold proper: a full body strength utility threshold in aluminum, 5 inches wide by 1/2 inch high, carrying one PVC thermal break and offered in 36 inch and 72 inch lengths. If the opening needs the saddle the door closes against, the 625A is the part; the Pemko 61 answers a different line item.
5) What does the thermal break on the Zero 625A actually do, and do I need one?
The 625A has one PVC thermal break running through the aluminum body. Aluminum conducts heat readily, so on an exterior opening with a big inside/outside temperature difference a solid extrusion will sweat, ice up, or telegraph cold into the floor slab. The PVC strip interrupts that path. If the opening is interior, or the two sides are conditioned the same, you don't need the break and a plain utility threshold will do.
6) What lengths and width does the Zero 625A threshold come in, and can I cut it down?
The 625A is a 5 inch wide profile sold in 36 inch and 72 inch lengths. Aluminum extrusion cuts cleanly with a miter saw and a non-ferrous blade, so ordering the next size up and trimming to the exact opening is normal practice. Order the 72 inch if your opening is a pair of doors or anything over 36 inches clear.
7) Does the Zero 625A interlock with the door bottom, or is it a flat saddle?
The 625A is a flat utility saddle. It takes the door bottom sweep or shoe coming down onto it, it does not hook into anything. If your detail calls for an interlocking threshold, that is a different part, for example the Pemko 61 Series interlocking J hook, which is the hook accessory that engages a matching door bottom. Don't order the 625A expecting to mate it with an interlocking hook.
8) For an exterior opening with a big temperature difference between inside and out, which threshold handles the thermal break?
The Zero 625A carries one PVC thermal break through the body of the aluminum threshold, which is what separates the interior and exterior halves of the saddle at a door with a large temperature differential. It is 5 inches wide by 1/2 inch high, ADA accessible, and is a commercial threshold. The Pemko 61 is an interlocking J hook threshold accessory in steel, 36 inches, and is a hook component rather than a thermally broken saddle, so on an exterior opening it does not cover the same requirement.
9) Is the Zero 625A a residential threshold or a commercial one?
Commercial. The 625A is a 5 inch by 1/2 inch utility profile with a 0.135 inch wall, sized and gauged for institutional openings rather than a house entry. A property manager standardizing across an apartment building's common doors and service entries can run this on every opening; for unit entry doors in a residential corridor it's more threshold than the opening needs.
How fast can I get the Zero International 625A 36 delivered?
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Can I return it if it doesn’t work for me?
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Does the Zero International 625A 36 come with a warranty?
Absolutely. The Zero International 625A 36 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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