Metallics JBBH39 Bolts 1/2-13 x 5 HXBT Sbr (Jar 25)

The JBBH39 is a 1/2-13 hex bolt with a 5 inch length. The 13 threads per inch is standard UNC coarse thread per ANSI/ASME B1.1, so it mates with any standard 1/2-13 nut or tapped hole. Threads and dimensions follow ASME B18.2.1 for hex bolts.

Silicon bronze resists corrosion in wet and marine environments and avoids galvanic reaction when bolting to bronze or copper-alloy hardware, which is why it shows up on grounding connections, water and waste work, and shoreline installations. The JBBH39 is silicon bronze to ASTM F468, the standard that covers nonferrous bolting materials. If you are fastening into plain steel structure in a dry interior, a plated steel bolt does the same mechanical job for less; the bronze earns its place where corrosion or dissimilar-metal contact is the problem.

No. The JBBH39 is not Buy American compliant and is not ARRA compliant, and country of origin is listed as multiple. If your project carries a domestic-content clause, this bolt will not satisfy it and you need a domestically sourced silicon bronze hex bolt instead.

Head width across flats measures 0.736 to 0.750 in., so a 3/4 inch wrench or socket is the right tool. Head height runs 0.302 to 0.323 in. It is a standard hex head, no washer face flange or captive washer.

The JBBH39 ships as a jar of 25 bolts, and 25 each is the order minimum, so the jar is the smallest buy. Metallics also lists other sizes and quantities in the BBH and JBBH hex bolt series by request if 1/2-13 x 5 is not the size you need.

Bolts only. The jar contains 25 hex bolts and nothing else, so order silicon bronze hex nuts and washers in 1/2-13 separately if you want the fastener assembly in matching material. Mixing a steel nut onto a bronze bolt reintroduces the dissimilar-metal problem the bronze was chosen to avoid.

Solid material. The bolt is silicon bronze throughout with a bronze finish, not a bronze-plated steel bolt, so cutting it to length or chasing a thread does not expose a different base metal underneath. That matters on grounding and marine work where a plated bolt would start corroding at any scratch.

Metallics lists the BBH and JBBH hex bolts for the electrical, plumbing, heating and air conditioning industries. In practice that means grounding and bonding connections, pipe hanger and support assemblies, and equipment anchoring where the bolt sits in a damp or corrosive location. The 5 inch length suits thick build-ups, stacked channel, or clamping through a flange and gasket.