Metallics JG8HC34 Bolts 1/2-13 X 2-1/2 G8 Hxbt St-zn (Jar 25)

It is a coarse-thread 1/2 inch bolt at 13 threads per inch, so it mates with any standard 1/2-13 UNC nut or tapped hole. 1/2-13 is the common coarse pitch for half-inch fasteners, so no fine-thread (1/2-20) hardware will thread onto it.

Grade 8 rating, with 150,000 psi minimum tensile and 130,000 psi minimum yield. Hardness runs Rockwell C33-39. That is the step up from Grade 5 you want where the joint is highly loaded, which is why these go into automotive and fleet work.

No. The JG8HC34 Grade 8 hex bolt is not Buy American compliant and is not ARRA compliant, and country of origin is listed as multiple. If your specification carries a domestic-content clause, this part will not satisfy it.

The bolt is medium carbon steel with a zinc plating. Zinc gives moderate corrosion protection for dry interior and sheltered work, which covers typical electrical, plumbing, and HVAC mounting. For constant wet exposure, salt spray, or coastal rooftops, zinc-plated carbon steel will eventually rust and stainless or hot-dip galvanized is the better call.

25 pieces, packed in a jar, and 25 each is the order minimum. If you need a different count or a different length in the same Grade 8 hex bolt, other sizes and quantities are available by request.

Grade 5 handles most general mounting and strut work. Go to Grade 8 when the connection sees higher tensile load than a Grade 5 can carry, such as automotive and fleet applications. The tradeoff is that the heat-treated Grade 8 is harder (Rockwell C33-39) and less forgiving of shock and bending than a Grade 5, so it is specified for strength, not ductility.

Medium carbon steel in the AISI 1021 to 1045 range, quench and heat treated to reach the Grade 8 property class. It is a hex head cap screw rather than a rolled-thread carriage or machine bolt, so it is driven with a wrench on the hex.