Metallics JG9HC30 Bolt 5/8-11 x 3-1/2 Grade 9 Hx Cap (Jar 25)

The JG9HC30 is a Grade 9 bolt, which sits above Grade 8 in tensile strength and is typically used where a Grade 5 or Grade 8 fastener keeps yielding or where a structural connection carries high shear and vibration. If your drawing calls for Grade 5 or Grade 8, a Grade 9 meets or exceeds that strength requirement. If the spec calls out Grade 9 specifically, substituting a Grade 8 is a downgrade and won't satisfy it.

Twenty-five bolts per jar, and the jar is the pack format rather than a loose bulk box. For electrical contractors doing strut, trapeze, or equipment anchoring, that's typically enough for a run without breaking into a second container, and the jar keeps the remainder sorted on the truck.

Yes. The 5/8-11 thread is the standard coarse series for 5/8 inch diameter, so standard 5/8-11 hex nuts, lock nuts, flat washers and lock washers all fit. Nuts need to be rated to match the bolt, though: pairing a Grade 9 bolt with a low grade nut means the nut strips before the bolt reaches its capacity, so use a hardened nut when you're developing the full strength of the fastener.

Metallics part number JG9HC30 is the 5/8-11 x 3-1/2 Grade 9 hex cap bolt in the 25 count jar. It's a single configuration, so there are no finish or length options to select at order time, just quantity of jars.

It depends on the load. For routine strut and box mounting, a Grade 5 fastener usually covers it and a Grade 9 is more bolt than the connection needs. Where the Grade 9 earns its place is heavy gear, transformer pads, switchgear skids, trapeze hangers carrying large conduit banks, and anything subject to constant vibration, where repeated loading works a lower grade bolt loose or stretches it. The JG9HC30 is catalogued for electrical work and the 3-1/2 inch length suits stacked channel, backing plate, and through-bolted assemblies rather than thin single-plate connections.