Metallics JG8HC22 Bolts 5/8-11 X 1-1/4 G8 Hxbt St-zn (Jar 25)

Grade 8 is the step up. The JG8HC22 is rated 150,000 psi minimum tensile and 130,000 psi minimum yield, with a hardness of Rockwell C33-39. Grade 5 of the same diameter runs well below that, which is why this bolt gets specified in automotive and fleet work where grade 5 will not carry the load. It is medium carbon steel, heat treated, per AISI 1021-1045.

No. The JG8HC22 is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. On federally funded or domestic-preference jobs that enforce those clauses, this part will not pass the submittal.

Twenty-five bolts per jar, and 25 each is the order minimum. The jar packaging keeps the 5/8-11 hardware together on a service truck or in a shop bin rather than loose in a bag. Metallics lists other sizes and quantities in the G8HC and JG8HC family by request.

The JG8HC22 is steel with a zinc finish, which gives moderate corrosion protection for general outdoor and damp-area use but is not stainless. In chronically wet, coastal, or chemically aggressive service, plated carbon steel will eventually corrode, so a stainless or hot-dip galvanized fastener is the better call there, with the understanding that stainless does not reach grade 8 strength levels.

Treat it as a one-time fastener in any critical joint. The JG8HC22 is heat-treated medium carbon steel at Rockwell C33-39 and 130,000 psi minimum yield; once a grade 8 bolt has been pulled toward yield it has stretched, and the plating under the head and in the threads is damaged. Since they come 25 to a jar, replace rather than reuse on structural or drivetrain work.

Read the head. A grade 8 hex cap screw like the JG8HC22 carries six radial lines on the head; grade 5 carries three. If someone hands you a loose 5/8-11 bolt and you need the 150,000 psi minimum tensile part, count the marks before it goes in the hole.