Metallics JG5HSF122 Bolt 1/2-13 x 2 Ind Hx Hd Serr Flan (Jar 50)

The JG5HSF122 is a 1/2-13 x 2 inch indented hex head bolt with a serrated flange. The 1/2-13 callout means a 1/2 inch diameter with 13 threads per inch, which is the UNC coarse thread for that diameter, so it mates with standard 1/2-13 nuts and tapped holes. The 2 inch figure is the shank length under the flange.

No. The serrated flange under the hex head spreads the load like a washer and the serrations bite into the mating surface to resist loosening under vibration, so you fasten with just the bolt and nut. That is why these show up on strut, equipment frames, and electrical enclosure mounting where you do not want loose washers in the bucket. On soft or finished surfaces the serrations will mar the material, so use a plain hex bolt and washer there instead.

Fifty bolts per jar, and the jar is the pack format, not a loose count, so the order unit is the full 50 piece container. That is the quantity contractors and MRO stockrooms keep on the truck or shelf for repeat strut and panel mounting work.

It is an indented hex head, so it drives with a standard socket or open end wrench rather than a driver bit. Measure across the flats of the head rather than going by the 1/2 inch thread diameter, since flange head bolts often use a smaller wrench size than a comparable standard hex bolt of the same diameter.