Metallics JBRHC16 Bolts 5/16-18 x 3 HXBT Br (Jar 100)

It's a 5/16-18 hex bolt, 3 inches long. The thread is 18 threads per inch (UNC for 5/16), and the measured major diameter runs 0.3065 to 0.3125 inch, so it mates with any standard 5/16-18 nut or tapped hole.

Solid brass. The material is listed as brass and the head color as brass, not a plating over steel. That matters for grounding and bonding work, where a brass bolt gives you a conductive, corrosion-resistant connection, and for any damp or outdoor enclosure where plated steel would rust at the threads.

The hex head measures 0.489 to 0.500 inch across the flats, so a 1/2 inch wrench or socket is the fit. Head height is 13/64 inch, with 0.14 inch of wrenching height, so keep that in mind in tight recesses. Brass strips easily, so snug it rather than torquing it like a steel Grade 5.

No. The jar of 100 is bolts only, hex head brass bolts in 5/16-18 x 3. You'll need to add 5/16-18 nuts and any washers separately, and for a brass bolt in a corrosion-sensitive or grounding application you generally want brass nuts and washers too rather than mixing in plated steel.

The JBRHC16 is flagged compliant for both Buy American and ARRA. Country of origin is China. On a federally funded job, hand both of those facts to your specifier before you submit, since the governing clause on your contract decides which one controls.

Three inches of overall length under the head is a lot of reach for electrical work. It suits stacked assemblies, strut and channel sandwiches, or bonding through thick enclosure walls and spacers. If you are only clamping an inch or so of material you will have threads hanging out past the nut, and you would be better off with a shorter 5/16-18 brass hex bolt. Metallics lists other sizes available by request.