Zero International 3672A 2" X 1/4" Traction Tread Thresholds, No Holes

No. The 3672A is listed as not ADA accessible. At 1/2 inch high it sits above the 1/4 inch vertical rise allowed without a bevel, so if the opening has to meet accessibility requirements you need a low-profile or ramped ADA threshold instead of this one.

Yes. The 3672A carries a Fire Rated-UL10c performance rating and is BHMA certified, so it can go under a fire door assembly. It is also a commercial-duty product rather than a residential one.

The 3672A measures 2 inches wide with a 1/4 inch thick plate and an overall height of 1/2 inch. It is supplied in a 36 inch length, which covers a standard 3-0 single door opening.

No, the 3672A ships without mounting holes. You drill it to suit your own anchor layout on site. Zero builds these from heavy-gauge aluminum specifically so they can be drilled and screwed straight into concrete without buckling under load or working the screws loose, which is the usual failure with lighter commercial stock. Fasteners are not part of the item, so order anchors separately.

The Zero 3672A is the one carrying the rating: it is fire rated to UL10c and BHMA certified, in a 2 inch wide by 1/4 inch thick traction tread profile for commercial openings. The Pemko 61 is catalogued as an interlocking J hook threshold accessory in steel, a hook piece rather than a rated threshold plate. For a labeled opening where the submittal needs a UL10c threshold, specify the 3672A. One thing to confirm before you order either: the 3672A is not ADA accessible, so if the opening falls under an accessible route requirement you will need a different profile.

The rubber tread inserts on the 3672A sit flush with the aluminum surface and are meant for indoor applications, so it is the one to use where you want slip resistance on an interior crossing rather than a bare mill saddle. The tread is what earns its keep in lobbies, corridors and vestibules with steady foot traffic.

That is what it is built for. Zero thresholds are made for heavy traffic openings and openings with extreme temperature differentials, and the heavy-gauge material is the reason. It is classed as a commercial product, not residential.

They do two different jobs at the opening. The Zero 3672A is a 2 inch wide by 1/4 inch thick traction tread threshold plate in aluminum mill finish, with rubber tread inserts set flush to the aluminum surface for indoor openings, supplied without mounting holes in a 36 inch length. The Pemko 61 is a 36 inch interlocking J hook threshold accessory of steel construction, which is a hook-type accessory piece rather than a treaded plate you walk across. If you want a finished walking surface with slip-resistant rubber at an interior opening, the 3672A is the plate; the Pemko 61 is the piece you reach for when the detail calls for an interlocking J hook.

Not for that detail. The Zero 3672A uses rubber tread inserts flush with the aluminum surface and is described for indoor applications, in a 2 inch by 1/4 inch profile at 36 inches long. If the drawing shows an interlocking J hook condition, the Pemko 61 is the 36 inch interlocking J hook threshold accessory, built in steel. Match the part to the detail on the drawing rather than the width alone, since both cover the same 36 inch opening.

It comes in aluminum mill finish, which is the raw unfinished aluminum. If you are matching a set of openings already running mill finish thresholds it will blend straight in; if your other doors are anodized, expect a visible difference in tone.

The 3672A is a single 36 inch plate with no interlock of its own. For a joint or a hooked connection, Pemko's 61 Series interlocking J hook threshold accessory is a steel 36 inch piece built for that purpose.