Metallics UBS08 Bolts 1/4-20 X 3 X 1-3/4 U-Blt &Nt SS (Bag 10)

The UBS08 is a 1/4-20 U-bolt with a 3 inch leg length and 1-3/4 inch inside width, so it wraps around round stock up to about 1-3/4 inches across. On conduit and tube runs that lands it on nominal sizes whose outside diameter is at or under 1-3/4 inches. Measure the actual OD of what you are strapping, not the trade size, since OD and nominal size differ on both pipe and conduit.

Yes, the bolt is 18-8 stainless steel and ships with two hex nuts. 18-8 is the common 300 series austenitic grade, which is why these get used outdoors, in damp mechanical rooms and on rooftop runs where a plated carbon steel U-bolt would rust at the threads.

No. Each UBS08 U-bolt comes with two hex nuts, one per leg, and the nuts are made to ASTM F594, the spec for stainless steel nuts. You will still need your own mounting plate, strut, or channel to thread the legs through, since no backing plate or saddle is included.

Two holes spaced to the 1-3/4 inch inside width of the UBS08 legs, measured center to center on the leg centers, with each hole sized to clear a 1/4 inch rod. The threads are 1/4-20 right hand to ANSI/ASME B1.1, so standard 1/4-20 nuts and taps apply.

Ten per bag, and ten each is the order minimum, so the bag is the buying unit. For a repeating hanger layout that is enough for ten support points, two nuts each.

The UBS08 is flagged as both Buy American compliant and ARRA compliant in the manufacturer data, which is what most federally funded and public agency specs ask for on fasteners. Country of origin is listed as multiple, so if your spec requires a single named origin on the submittal, confirm the origin of the specific lot you receive.

18-8 stainless against galvanized steel strut will drive galvanic corrosion of the zinc at the contact point in wet or coastal conditions, and stainless against copper is the milder but still active pair. Dry indoor runs are generally not a problem. Outdoors, isolate with a plastic or rubber-lined clamp or an isolation washer, or match the strut material to the fastener.

Metallics lists the UBS08 for electrical, plumbing, heating and air conditioning work. It is a plain U-bolt and two nuts, so it strapping conduit, copper or steel pipe, tubing, and small round duct supports equally well. Nothing about it is electrical-specific beyond how it is catalogued.