Metallics JBRHC103 Bolts 5/16-18 x 2-1/4 HXBT Br (Jar 100)

The JBRHC103 is a 5/16-18 bolt, so it's 18 threads per inch in a coarse 5/16 size. Measured shank outside diameter runs 0.3065 to 0.3125 in. It mates with any standard 5/16-18 nut or tapped hole, which is the common thread on ground bus bars, strut, and enclosure hardware.

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 and for outdoor or damp locations where a plated steel bolt would rust through.

Across-flats head width is 0.489 to 0.500 in., so a 1/2 inch wrench or socket is the fit. Head height is 13/64 in., with a wrenching height of 0.14 in., so there is not much flat to grab, use a six point socket seated fully to avoid rounding the soft brass.

They ship 100 to a jar and 100 count is the order minimum, so one jar is the smallest buy. Other sizes and quantities can be had by request if 2-1/4 inch length is not what the job needs.

The JBRHC103 runs 2-1/4 inches of bolt length under the head. Stack your material thickness plus any washers and leave a couple of threads past the nut. If you are only clamping a lug to a bus bar you will have a lot of excess shank, in which case a shorter length is the better order, those are available by request.

The JBRHC103 is flagged as both ARRA compliant and Buy American compliant in the manufacturer data, while country of origin is listed as China. On a federally funded job, submit both facts to your specifying authority before you commit, since the compliance route depends on the clause in your contract.

Brass is the pick where you want a conductive, corrosion resistant fastener in contact with copper, which is why these turn up on ground bars, water pipe bond clamps, and damp or exterior enclosures. Brass is softer than a plated steel bolt, so it is not the choice for high torque structural clamping, use steel there. The JBRHC103 is solid brass in 5/16-18 by 2-1/4 inches.