Metallics JBBH5 Bolts 1/4-20 X 2-1/2 Hxbt Sbr (Jar 100)

Solid silicon bronze, not a plated steel bolt. The material conforms to ASTM F468, the standard covering nonferrous bolts and studs, and the finish is bronze throughout. That is why it gets used on marine, water-contact, and dissimilar-metal jobs where a zinc-plated steel bolt would corrode away.

It is a 1/4-20 thread, 20 threads per inch, cut to ANSI/ASME B1.1 Unified inch threading. Any standard 1/4-20 UNC nut or tapped hole will engage it. For a corrosion-matched joint, pair it with a silicon bronze nut and washer rather than plated steel, otherwise you reintroduce the galvanic couple the bronze bolt was chosen to avoid.

No. The JBBH5 silicon bronze hex bolt is not Buy American compliant and is not ARRA compliant, and country of origin is listed as multiple. On a federally funded job with domestic sourcing language in the spec, this part will not satisfy it.

The JBBH5 ships as a jar of 100 bolts, and the jar is the minimum order unit, so it is sold full jar rather than by the piece. Packed weight is 3.66 lbs. Other sizes and quantities can be had by request.

Metallics lists the BBH and JBBH silicon bronze hex bolts for electrical, plumbing, heating and air conditioning work. The usual reason to specify bronze over galvanized steel or stainless is electrical and corrosion behavior: it is the standard choice for grounding and bonding connections to copper, for copper pipe hangers and clamps, and anywhere wet contact with copper or brass would corrode a steel fastener. If the joint has no copper and no moisture, plated steel does the same mechanical job for less.

The JBBH5 is a 2-1/2 inch bolt overall under the head, so plan on a grip of roughly 2 inches or less once you allow for a nut and washer and full thread engagement. For strut, unistrut sandwiches, or stacked clamp assemblies thicker than that, step up to a longer length in the same BBH and JBBH silicon bronze series.