Metallics JBHCC1 Bolt 1/4-20 x 3/4 HXBT Cu (Jar 100)

Copper, as the Cu in the part description indicates. Electricians specify copper hex bolts for grounding and bonding connections because joining copper lugs and copper bus or ground bars with a copper fastener keeps the whole joint one metal, which avoids the galvanic corrosion you get when steel or zinc hardware sits against copper in a damp vault, manhole or outdoor enclosure. Copper is softer than steel, so torque it to the connector manufacturer's value rather than wrenching it tight.

One hundred bolts per jar. The packaging is a jar rather than a bag or box, which is what service trucks and MRO stockrooms want for loose small fasteners, since the lid keeps them contained on a shelf or in a van bin.

No. The JBHCC1 is the bolt only, 100 to the jar. If your connection needs a nut, flat washer, or lock washer, order those separately, and keep them copper or silicon bronze to match the bolt so the joint stays one metal family.

That is the usual application for this size. A 3/4 inch 1/4-20 copper hex bolt gives enough grip for a lug pad plus a bar of typical thickness with a nut on the back, and it drops into the 1/4 inch hardware holes common on ground bars and lug pads. If your stack-up is thicker than roughly a half inch once you add washers, move up to a longer copper bolt instead, since you want full thread engagement in the nut.

Order it as Metallics JBHCC1. That number covers the 1/4-20 x 3/4 inch copper hex bolt in the 100 count jar, and it is the single ordering code for the item, so there is no finish or length option to specify alongside it.