Metallics JG8HC33 Bolts 1/2-13 X 2 G8 Hxbt St-zn (Jar 25)

It's a Grade 8 hex cap screw, rated at 150,000 psi minimum tensile and 130,000 psi minimum yield. That's the reason to reach for it over a Grade 5 fastener, which won't carry the same tensile load. Hardness runs Rockwell C33-39 on medium carbon steel, heat treated.

The bolt is 1/2-13 by 2 inches long, so 13 threads per inch, UNC coarse. Any standard 1/2-13 nut or tapped 1/2-13 hole will take it. For a Grade 8 bolt loaded near its rating, pair it with a Grade 8 (Grade C) nut so the nut isn't the weak link.

No. The JG8HC33 is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. If your project specification carries a domestic sourcing clause, this bolt will not satisfy it.

The finish is zinc over steel, which handles indoor and protected exterior service and general corrosion from handling and humidity. It is not stainless. For constant wet exposure, coastal air, or direct ground contact, specify hot dip galvanized or stainless instead, and note that electroplated Grade 8 fasteners carry a hydrogen embrittlement consideration when highly loaded.

It ships as a jar of 25 pieces, with 25 each as the order minimum. The jar pack is what makes it practical for a service van or a shop bin rather than a bulk box you have to decant.

Yes, it's catalogued for electrical, plumbing, heating and air conditioning work, and the same bolt is used in automotive and fleet applications where Grade 5 tensile isn't enough. Typical uses are strut and trapeze hangers, equipment mounting, and panel or transformer anchoring where you're bolting into tapped steel or using a nut on the back side. Grip length matters: at 2 inches overall, allow for the unthreaded shank when you stack washers and material.

Hex head, so it drives with a standard wrench or socket rather than a driver bit. On a 1/2-13 hex cap screw that's typically a 3/4 inch wrench. There is no internal drive on this bolt.

Medium carbon steel in the AISI 1021 to 1045 range, quenched and tempered to reach Grade 8 properties. That chemistry is what lets it hit Rockwell C33-39 and the 150,000 psi tensile minimum; a low carbon Grade 2 bolt in the same size cannot be heat treated to it.

The G8HC and JG8HC series runs beyond the 1/2-13 x 2 size, and other sizes and quantities are offered by request. The JG prefix is the jar pack; the plain G8HC numbers are the same bolt in other pack configurations.