Metallics JSHTB59 Bolts 3/8-16 X 1-1/4 Hx Tap Blt SS (Jar 100)

Yes. It's a hex tap bolt, meaning full thread right up under the head rather than a partially threaded hex cap screw. Metallics lists it for complete thread engagement applications, which is the reason to pick a tap bolt when you are threading into a tapped hole, a channel nut, or a strut insert and need every bit of the 1-1/4 inch length working.

The thread is 3/8-16 right hand, 16 threads per inch, made to IFI-199 (2014). That is standard UNC coarse, so it mates with any 3/8-16 nut, coupling nut, channel nut, or tapped 3/8-16 hole. It will not run into a 3/8-24 fine thread part.

They're 18-8 stainless steel, so they hold up outdoors, in damp mechanical rooms, and in washdown areas without the zinc coating wearing off the way a plated carbon steel bolt does. 18-8 is the usual choice for exterior strut, hanger, and conduit support work. For chloride-heavy coastal or pool chemical exposure, 316 stainless is the step up.

Rated at 95,000 psi minimum tensile and 60,000 psi minimum yield, with hardness Rockwell B95 to C32. That is in the range of a Grade 2 carbon steel bolt rather than a Grade 5 or Grade 8, so for high-torque structural connections you want a plated alloy bolt instead. Where 18-8 earns its place is corrosion resistance on supports, hangers, equipment mounting, and strut.

No. The JSHTB59 is listed as not Buy American compliant and not ARRA compliant, with country of origin shown as multiple. On a federally funded project with domestic sourcing requirements in the spec, you need a domestically produced fastener instead.

Head width across flats measures 0.544 to 0.562 inch, which is a 9/16 inch wrench or socket. Hex head, so a standard six-point socket or open end works, no specialty driver needed.

They ship in a jar of 100, and 100 jar is also the order minimum, so one jar is the smallest buy. The jar packaging is the practical part on a service truck: it keeps a single size separated instead of loose in a bin. Other sizes and quantities are available by request.

Metallics lists it for electrical, plumbing, heating, and air conditioning work. In practice that is strut and channel nut connections, conduit and pipe hanger assemblies, equipment and panel mounting, and duct support hardware, anywhere you are threading into a tapped part and want full thread engagement in a short grip.