Metallics JG8HC38 Bolts 1/2-13 x 4-1/2 G8 HXBT St-zn (Jar 25)

Yes. The JG8HC38 is Grade 8, rated 150,000 psi minimum tensile and 130,000 psi minimum yield, hardness Rockwell C33-39. That's the step up you take when a Grade 5 won't carry the tensile load, which is why these get specified on automotive and fleet work. For general bracket and strut mounting a Grade 5 is usually enough; go Grade 8 where the joint is highly loaded or clamp load matters.

No. The JG8HC38 is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. If your spec carries a domestic-content requirement, this bolt won't satisfy it and you'll need a domestically sourced Grade 8 instead.

These 1/2-13 x 4-1/2 Grade 8 bolts ship in a jar of 25, and 25 each is the order minimum. So it's a full jar per order, not loose pieces. Other sizes and quantities can be requested.

The JG8HC38 is medium carbon steel with a zinc finish. Zinc plating handles indoor and sheltered service and gives light outdoor corrosion protection, but it is a plating, not stainless or hot-dip galvanizing. For sustained weather exposure, coastal air, or wet mechanical rooms, expect eventual white rust at the threads and plan on a heavier coated or stainless fastener instead.

Material standard is AISI 1021 through 1045 medium carbon steel, quenched and tempered to Grade 8 properties, with hardness coming in at Rockwell C33-39. The heat treat is what gets the bolt to 150,000 psi tensile, so never weld or torch-heat one, you'll destroy the temper and the rating with it.

Metallics lists field application as electrical, plumbing, heating and air conditioning work. In practice that's equipment anchoring, through-bolting channel and strut assemblies, hanging heavier mechanical gear, and any joint long enough to need 4-1/2 inches of grip where Grade 5 clamp load isn't adequate. The same bolt is common in fleet and automotive repair.