Metallics JG5HC88 Bolts 3/8-16 X 1/2 G5 Hxbt St-zn (Jar 100)

Grade 5, with 120,000 psi minimum tensile and 92,000 psi minimum yield. Hardness runs Rockwell C25-34. It's medium carbon steel, heat treated, which is why it holds those numbers rather than the soft Grade 2 hardware sold loose in most hardware aisles. For motor mounting and equipment anchoring where the fastener is torqued to a spec, that difference matters.

It's a 3/8 diameter bolt at 16 threads per inch, which is standard 3/8 coarse thread, so it threads into any 3/8-16 tapped hole or standard 3/8 coarse nut. Measured shank diameter is 0.3690 to 0.3750 inch. Threads are made to ASME B18.2.1-2012.

Not much, and that's the thing to check before ordering. The JG5HC88 is a 3/8-16 bolt with a 1/2 inch body, so once you allow for the thread engagement you need in the tapped hole, it's meant for bolting a thin flange, bracket foot, or motor base directly to tapped metal. If you're stacking a washer plus a bracket plus a nut, you want a longer bolt. Metallics lists the G5HC and JG5HC series in other lengths.

No. The JG5HC88 is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. If your project has domestic sourcing requirements written into the contract, this is not the fastener to submit; ask for a domestic Grade 5 hex bolt instead.

The hex head measures 0.551 to 0.562 inch across the flats, which is a 9/16 inch wrench or socket. Head height is 15/64 inch, with 0.16 inch of wrenching height, so it needs a short reach socket rather than a deep one if you're working in a tight motor base.

The JG5HC88 is zinc plated steel, which handles indoor mechanical rooms, equipment rooms, and general electrical, plumbing, and HVAC work. Zinc is a sacrificial coating, not stainless, so for sustained outdoor exposure, wet roof curbs, or coastal air you should step up to a hot dip galvanized or stainless fastener instead.

It ships as a jar of 100 bolts, and the jar is the order unit, so 100 pieces is the minimum. Jar weight is 1306 g. For MRO stockrooms, the jar packaging is the practical advantage over a loose bin, it stays labeled on the shelf.

Yes, that's the stated use for the G5HC and JG5HC series, along with automotive and truck repair. A Grade 5 cap screw at 120,000 psi minimum tensile is what a motor base calls for over a Grade 2 bolt, since motor mount fasteners carry vibration and get torqued to spec. Just confirm your base and tapped hole stack is thin enough for the 1/2 inch length.

Material is carbon steel in the AISI 1008 to 1026 range, heat treated to reach Grade 5 properties. That's the normal medium carbon range for Grade 5 cap screws and it welds and machines predictably, though heat treated bolts should not be welded if you're relying on the rated strength.