Zero International 68A Adjustable Threshold with Thermal Break
The Zero International 68A Adjustable Threshold with Thermal Break is engineered for heavy traffic openings and doorways facing extreme temperature differentials. Measuring 2" wide and 1/2" high, this heavy-gauge aluminum mill finish threshold is built to be drilled and screwed directly into concrete without the buckling or loose-screw issues common with lighter commercial materials. It carries a Fire Rated-UL10c listing and meets ANSI/BHMA designations 68A, 68BK, 68D, 68G J37360, J37336, 68B J17360, J17336, making it a dependable choice for commercial door openings requiring both durability and code compliance.
Key Features
- Compact Threshold Profile: 2" width and 1/2" height provide a low-profile adjustable transition suited to a wide range of commercial door openings.
- Heavy-Gauge Construction: Thicker material than standard commercial thresholds allows direct drilling and screwing into concrete without buckling under heavy loads or developing loose screws over time.
- Thermal Break Design: Helps manage extreme temperature differentials across the threshold, reducing heat and cold transfer at the door opening.
- Aluminum Mill Finish: Durable mill-finished aluminum construction resists wear in high-traffic commercial applications.
- Fire Rated Performance: UL10c fire rating supports use in openings with fire protection requirements.
- Multiple ANSI/BHMA Designations: Cross-referenced under 68A, 68BK, 68D, 68G J37360, J37336, 68B J17360, and J17336 for compatibility verification and specification purposes.
- Adjustable Configuration: Adjustable design allows for fine-tuning threshold height to accommodate varying door bottom and floor conditions.
Certifications & Compliance
- Fire Rated-UL10c
- ANSI/BHMA 68A, 68BK, 68D, 68G J37360, J37336, 68B J17360, J17336
Technical Specifications
- Product Group: Door Trim and Accessories
- Product Subgroup: Door Thresholds
- ADA Accessible: No
- Product Finish: Aluminum Mill
- Product Height: 1/2"
- Product Width: 2"
- 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 68A?
Zero International threshold products are built from heavy-gauge materials designed to withstand heavy traffic and extreme temperature differentials without buckling or loosening over time. With a UL10c fire rating and cross-referenced ANSI/BHMA designations, the 68A threshold offers commercial specifiers a reliable, code-conscious solution for demanding door openings. Its thermal break construction and adjustable design make it a practical choice for professional installations where long-term performance matters.
Manufacturer Resources
zero thresholds 68 data sheet
Product Specs
- Product Group:
- Door Trim and Accessories
- Product Subgroup:
- Door Thresholds
- Product Type:
- Threshold
- ADA Accessible:
- No
- Commercial/Residential:
- Commercial
- Product Finish:
- Aluminum Mill
- Performance Rating:
- Fire Rated-UL10c
- Product Height:
- 1/2"
- Product Width:
- 2"
- Department:
- Door Hardware
Zero International 68A-36 – Frequently Asked Questions
1) Will the Zero 68A threshold fit under a door that swings over it, or is it too tall?
The 68A sits 1/2 inch high and 2 inches wide, so it is a low-profile transition that clears most commercial door bottoms without cutting the door. That 2 inch width also means it takes up very little of the floor at the opening, which matters when the door swings over the threshold and you still need room for a sweep or automatic door bottom to seat against it. Because it is adjustable, you can fine-tune the height to the actual gap between the door bottom and the finished floor rather than living with whatever the slab gave you.
2) Is the Zero 68A threshold ADA compliant for an accessible entrance?
No. The 68A is not an ADA accessible threshold, so it should not be specified at an opening that has to meet accessible route requirements. At 1/2 inch high it is close, but the product is explicitly designated non-ADA, and for an accessible door you want a threshold sold as ADA compliant with a beveled profile. Use the 68A on service doors, back-of-house, mechanical rooms, and other openings outside the accessible route.
3) Can the Zero 68A threshold be used on a fire rated door opening?
Yes. The 68A carries a Fire Rated-UL10c performance rating, which is the positive-pressure fire door test standard, so it can go into an opening with fire protection requirements. It also cross-references to ANSI/BHMA designations 68A, 68BK, 68D, 68G J37360, J37336, 68B J17360 and J17336, which is what a specifier or an AHJ will want to see against the door schedule.
4) What lengths does the Zero 68A threshold come in, and what do I order for a pair of doors?
Four lengths: 36, 72, 84 and 120 inches. A 36 inch piece covers a single 3-0 leaf. For a pair of 3-0 doors you need roughly 72 inches plus frame, so the 84 inch piece is the safe pick and gets cut down on site. The 120 inch length is there for wide storefront pairs and openings with sidelites. Aluminum cuts clean with a miter saw and a non-ferrous blade, so ordering long and trimming to the actual jamb-to-jamb measurement is the normal way to do it.
5) Is the Pemko 61 interlocking J hook a substitute for the Zero International 68A threshold?
They are not interchangeable parts. The Zero International 68A is an adjustable threshold with a thermal break, 2 inches wide and 1/2 inch high in an aluminum mill finish, carrying a Fire Rated-UL10c performance rating. The Pemko 61 Series is an interlocking J hook threshold accessory in steel construction, supplied at 36 inches. A locksmith or contractor working the opening should treat the 68A as the threshold itself and the Pemko 61 as an interlocking J hook accessory piece, so specifying one in place of the other changes what actually lands on the floor of the opening.
6) What does the thermal break on the Zero 68A threshold actually do for me?
It interrupts conduction through the aluminum. Aluminum moves heat readily, so at an exterior door with a big inside-to-outside temperature difference a solid aluminum threshold becomes a cold bridge, sweats, and in cold climates ices at the floor line. The thermal break in the 68A breaks that path and cuts heat and cold transfer at the opening. If the door is interior, or leads to a conditioned corridor, the thermal break buys you nothing and a plain adjustable threshold does the same job.
7) Can the Zero 68A threshold be screwed straight into a concrete slab?
Yes, that is what the heavy-gauge material is for. The 68A is made from thicker stock than a standard commercial threshold so it can be drilled and anchored directly into concrete without buckling under traffic or working its screws loose over time. Drill the threshold, transfer your holes, and set sleeve or lag anchors into the slab. Lighter-gauge extrusions are the ones that dimple around the fastener heads and go loose in a year on a high-traffic door.
8) Is the Pemko 61 the same thing as a Zero 68A threshold?
No, and they are not substitutes for each other. The Pemko 61 Series is an interlocking J hook threshold accessory in steel, 36 inches, meaning it is a piece that works with an interlocking door bottom hook rather than a standalone adjustable threshold. The 68A is an aluminum adjustable threshold with a thermal break, 2 inches wide and 1/2 inch high, and it seals against a sweep or door bottom rather than interlocking with one. If your door already has an interlocking hook on the bottom rail, the 68A is not the mating part.
9) What else do I need to order with a Zero 68A threshold to seal the bottom of the door?
The threshold alone does not seal the opening. The 68A gives the door something flat and adjustable to close down onto, but you still need a door bottom sweep or an automatic door bottom on the leaf to close the gap, and gasketing at the jambs and head if you are weatherstripping the whole opening. Anchors are the other item: fasteners suited to the substrate, since the 68A is drilled and screwed into the floor and concrete anchors are not supplied with the extrusion.
10) Aluminum or steel at the threshold - which one goes in a commercial opening that needs a fire rating?
The Zero International 68A is aluminum mill finish and carries a Fire Rated-UL10c performance rating, which is the value an institutional or MRO buyer checks against a fire-rated opening schedule. The Pemko 61 Series is steel construction and is an interlocking J hook threshold accessory rather than the rated threshold assembly. For an opening where the fire rating has to be documented, the UL10c listing sits with the 68A, and it comes in 36, 72, 84, and 120 inch lengths so a facility can standardize one profile across a run of doors.
11) What finish does the Zero 68A threshold come in, and can I get it in dark bronze to match my other openings?
Aluminum mill finish is the finish on the 68A, in every length. Mill is the raw uncoated extrusion, a plain silver-grey that reads as standard commercial and does not need to match a lockset or a closer. If the rest of your building standard is dark bronze or black anodized, the 68A will not match it, and a threshold is one of the few pieces of door hardware where nobody notices, since it lives on the floor and takes shoe traffic all day.
12) Is the Zero 68A threshold suitable for a house, or is it a commercial-only part?
Commercial. The 68A is built for commercial openings, and the things that make it right there, heavy-gauge stock for direct concrete anchoring, a UL10c fire rating, ANSI/BHMA designations, are the things a residential entry does not need and does not pay for. It is a fit for office buildings, schools, healthcare, retail, warehouses, multi-tenant residential common doors, and government facilities. For a single-family front door, a residential-grade threshold is the right call.
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Does the Zero International 68A-36 come with a warranty?
Absolutely. The Zero International 68A-36 is backed by a manufacturer’s warranty.
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