Metallics JHTB38 Bolts 5/16-18 X 3/4 Hx Tap Blt St-zn (Jar 100)

The JHTB38 is a steel bolt with 60,000 psi minimum tensile strength and a hardness of Rockwell B69-B100, which is standard low-carbon fastener territory. That suits electrical, plumbing, heating, and air conditioning hanging and mounting work. For structural connections calling out a graded bolt on the drawing, specify a Grade 5 or Grade 8 cap screw instead.

No. The JHTB38 is not Buy American compliant and is not ARRA compliant, with multiple countries of origin on record. If your project has domestic sourcing requirements written into the contract, these won't satisfy them.

Yes. The hex head measures 0.484 to 0.500 inch across the flats, so a 1/2 inch wrench or socket is the right tool. The head is a plain hex, not flanged.

Zinc plated steel handles indoor and sheltered damp conditions, which covers most mechanical rooms and above-ceiling work. For direct weather exposure, washdown areas, or anywhere corrosive, step up to the 18-8 stainless version of the hex tap bolt series rather than the zinc.

The JHTB38 ships as a jar of 100 pieces, and 100 in the jar unit of measure is the order minimum, so one jar is the smallest buy. Metallics does offer other sizes and quantities of the hex tap bolt on request.

A hex tap bolt like the 5/16-18 JHTB38 is threaded the full length of the shank; a hex cap screw has a plain unthreaded grip under the head. Full thread is what you want when you're threading into a tapped channel nut, a strut nut, or a short tapped hole in sheet steel and need every bit of the 3/4 inch length engaged. If your joint needs a shoulder bearing in a clearance hole, use a partially threaded cap screw instead.