Blackburn 37100BB-C SILICON BRONZE HEX HEAD BLT 3/8-16

It's a 3/8 inch diameter bolt with 16 threads per inch (3/8-16), 1 inch long under the head type designation, with a hex head. That thread pitch is the standard UNC coarse thread for 3/8 inch fasteners, so it mates with standard 3/8-16 nuts and tapped holes.

Silicon bronze is the material used on grounding and bonding connectors because it stays compatible with copper conductors and copper-alloy clamps. Pairing a steel or galvanized bolt with a bronze connector body puts two dissimilar metals in contact at a joint that is often buried or exposed to weather, which is where corrosion starts. The 37100BB-C is silicon bronze throughout, so the bolt matches the connector it's tightening.

Each. The selling unit of measure is one bolt, so quantity ordered equals the number of bolts received. If you're bolting up a run of ground plates or split bolts, count the connections and order that many.

The 37100BB-C is the bolt only, a 3/8-16 silicon bronze hex head bolt. Any nut, flat washer, or lock washer for the joint has to be ordered separately, and for a grounding connection they should also be silicon bronze or bronze alloy so you aren't mixing metals at the same joint.

Silicon bronze is the alloy specified for exposed and buried grounding hardware precisely because it resists corrosion in soil and weather better than plated steel. That's what this bolt is made of, so it suits ground rod clamps, ground wells, and outdoor bonding points. Keep the whole joint in bronze or copper alloy to avoid setting up a galvanic couple.

Blackburn part number 37100BB-C. That's the manufacturer part number as well as the model designation, so it's the number to quote on a purchase order or match against a submittal for a silicon bronze 3/8-16 hex head bolt.

Country of origin is Taiwan. Worth knowing if you're submitting on a job with domestic-content requirements, since a Buy America or similar clause would rule this bolt out on that basis alone.