Metallics JG8HC231 Bolts 3/8-16 X 1 G8 Hxbt St-zn (Jar 100)

It's a 3/8 inch diameter bolt with 16 threads per inch, 1 inch long under the head. Measured shank diameter runs 0.3690 to 0.3750 inch, so it drops into a standard 3/8 inch clearance hole and threads into any 3/8-16 UNC nut or tapped hole.

Grade 8 buys you tensile strength. This bolt is rated 150,000 psi minimum tensile and 130,000 psi minimum yield, where a Grade 5 of the same size is materially lower. Metallics calls it out for automotive and fleet work where Grade 5 won't carry the load. For general strut, conduit hanger, and equipment mounting duty a Grade 5 is usually fine; step up to Grade 8 when the engineer or the equipment manual specifies it, or when the joint sees high clamp load or vibration.

No. The jar contains 100 Grade 8 hex bolts only. You'll need to order matching 3/8-16 Grade 8 nuts and hardened washers separately; pairing a Grade 8 bolt with a lower-grade nut or an unhardened washer gives up the strength you paid for.

No. The JG8HC231 is not Buy American compliant and is not ARRA compliant, and country of origin is listed as multiple. If your project carries a domestic-sourcing requirement, you need a domestically produced Grade 8 fastener instead.

The JG8HC231 ships as a jar of 100 pieces, and the jar is the minimum order unit. Metallics notes that other sizes and quantities are available by request, so if you need a different length or a bulk box rather than a jar, ask.

The bolt is medium carbon steel with a zinc plated finish. Zinc plating handles indoor and sheltered conditions and incidental moisture, but it is not a marine or sustained-wet finish. For rooftop, coastal, wash-down, or buried applications, specify hot-dip galvanized or stainless instead. Note that Grade 8 fasteners are generally not offered hot-dip galvanized because of hydrogen embrittlement risk, so a wet exterior job usually means re-engineering around a different grade or material.

Medium carbon steel in the AISI 1021 to 1045 range, quench and temper heat treated to Rockwell C33-39. That hardness is what delivers the 150,000 psi tensile rating, and it's also why you should not weld, bend, or re-cut these bolts in the field: heat destroys the temper.

Metallics lists field application as the electrical, plumbing, heating and air conditioning industries, alongside the automotive and fleet use that Grade 8 is known for. So it's a normal stocking item for equipment anchorage, hanger and bracket connections, and machine mounting in MRO and contractor work.