Metallics JG8HC7 Bolts 1/4-20 X 1/2 G8 Hxbt St-zn (Jar 100)

Yes. The JG8HC7 is a 1/4-20 hex cap screw, 20 threads per inch, with a shank outside diameter of 0.2450 to 0.2500 inch. That is the standard UNC coarse pitch for 1/4 inch fasteners, so any 1/4-20 nut or tapped 1/4-20 hole mates with it. For a Grade 8 joint you want a matching hardened nut rather than a standard low-carbon one, or you give up the strength the bolt provides.

Grade 8 is the step up when a Grade 5 is not enough. The JG8HC7 is a Grade 8 cap screw rated 150,000 psi minimum tensile and 130,000 psi minimum yield, hardened to Rockwell C33-39 from medium carbon steel. Metallics calls out automotive and fleet work as the typical use, anywhere greater tensile strength than a Grade 5 is required. For general electrical strut, enclosure, and bracket mounting a Grade 5 or even Grade 2 is usually fine; Grade 8 earns its place in high-load, vibration, or clamping-critical joints.

At 1/2 inch of length under the head, the JG8HC7 is a short bolt. Count on it for clamping thin stacks, roughly 1/4 inch or less of combined material into a tapped hole or nut, since you need several threads of engagement past the far face. For thicker stacks or strut channel with a nut on the back, step up to a longer 1/4-20 Grade 8. Metallics offers other lengths in the G8HC and JG8HC series by request.

The JG8HC7 is steel with a zinc finish, which handles indoor service, enclosed panels, and incidental moisture. It is not a stainless or hot-dip galvanized fastener, so for continuous outdoor exposure, wet wells, coastal air, or anywhere washdown chemicals hit the hardware, zinc-plated carbon steel will eventually corrode. Specify a corrosion-resistant fastener for those spots instead.

These ship in a jar of 100 pieces, and 100 count is the order minimum. The jar is practical for a service truck or an MRO crib bin since the bolts stay contained and labeled rather than loose in a drawer.

Metallics lists the JG8HC7 as both ARRA compliant and Buy American compliant, which is what a public-works or federally funded spec usually asks for on fasteners. Country of origin is recorded as multiple, so if your contract requires a single named country of manufacture, confirm the origin on the lot you receive.

Material standard is AISI 1021 through 1045 medium carbon steel, heat-treated and hardened to Rockwell C33-39 to reach Grade 8 strength. Because the strength comes from that heat treatment, do not weld, flame-cut, or re-heat these bolts. Welding destroys the temper and you lose the 150,000 psi tensile rating. Use a weldable low-carbon fastener if the joint has to be welded.