Metallics JBBH54 Bolts 5/16-18 X 1-1/4 Hxbt Sbr (Jar 100)

Solid silicon bronze, not a plated steel bolt. The material is silicon bronze per ASTM F468, which is the nonferrous bolting material standard, and the finish reads as bronze because that is the base metal. That matters for grounding and marine or corrosive work where a plated bolt would eventually rust through.

It is a 5/16-18 bolt, 18 threads per inch, cut to ANSI/ASME B1.1. That is standard 5/16 coarse thread (UNC), so any off the shelf 5/16-18 nut or tapped 5/16-18 hole will take it. For corrosion matching you want a silicon bronze nut rather than a plated steel one.

No. The JBBH54 is not Buy American compliant and is not ARRA compliant, and country of origin is listed as multiple. If your contract carries a domestic sourcing clause, this part will not clear it and you need a domestically produced silicon bronze bolt instead.

Head width across flats measures 0.489 to 0.500 inch, so a 1/2 inch wrench or socket is the fit. Head height runs 0.195 to 0.211 inch. The bolt is a hex head built to ASME B18.2.1 dimensions, so it drives like any standard 5/16 hex cap screw.

The JBBH54 ships as a jar of 100, and one jar is the order minimum. If you need a different length, diameter, or count, Metallics makes other sizes and quantities in the BBH and JBBH series available by request.

Metallics lists it for electrical, plumbing, heating and air conditioning work. Silicon bronze is the usual pick where you need a conductive, corrosion resistant fastener, so typical uses are grounding and bonding connections, strut and hanger hardware in damp or chemical environments, and anywhere galvanized or plated steel would corrode and loosen the joint.

A full jar of 100 comes to 4.23 lbs. The packaged jar measures 3.5 inches in length and width with a 5.75 inch height, which is worth knowing if you are staging multiple jars on a truck or in a service van bin.