Metallics BBH66 Bolts 1/2-13 X 2-1/4 Hxbt Sbr (Jar 100)

The BBH66 is a 1/2-13 hex bolt, so 13 threads per inch on a 1/2 inch diameter. Threads are cut to ANSI/ASME B1.1, which is the Unified inch thread standard, so any standard 1/2-13 UNC nut or tapped hole will take it. Length is 2-1/4 inches.

Solid silicon bronze, not a plating. The finish reads bronze because that is the base metal, and the material conforms to ASTM F468, the standard for nonferrous bolts and studs. That matters for grounding and marine or corrosive work where a plated steel bolt would rust through.

No. The BBH66 is not Buy American compliant and is not ARRA compliant, and country of origin is listed as multiple. If you are on a federally funded project with domestic sourcing language, this bolt will not satisfy it and you need a domestically produced silicon bronze fastener instead.

Head width across flats measures 0.736 to 0.750 inches, which is a 3/4 inch wrench or socket. Head height runs 0.302 to 0.323 inches. Dimensions follow ASME B18.2.1, so it is a standard hex bolt head with no odd prep needed.

They ship 100 bolts to a jar, and 100 count is the order minimum, so the jar is the buying unit. Metallics lists other sizes and quantities by request if 2-1/4 inch is not the length you need.

It depends on what you are bolting to. Silicon bronze, as used in the BBH66, is the pick when the bolt contacts copper or bronze, which covers grounding lugs, ground rod clamps, and marine fittings, because the metals are galvanically close and will not eat each other. Stainless is the pick for general structural outdoor work where strength matters more and copper is not in the joint. Do not mix bronze bolts into an aluminum assembly without isolating them.