Metallics JHTB90 Bolts 3/8-16 x 5/8 Hx Tap Blt St-zn (Jar 100)

The JHTB90 is a 3/8-16 x 5/8 inch hex tap bolt, so 16 threads per inch, right hand thread, cut to the IFI-199 (2014) thread standard. A 3/8-16 is the standard coarse (UNC) 3/8 inch thread, so it mates with 3/8-16 nuts, strut channel nuts, and tapped 3/8-16 holes in beam clamps or hangers.

Tensile strength is 60,000 psi minimum with a hardness of Rockwell B69 to B100, which is standard low carbon steel bolt territory, and the field applications called out are electrical, plumbing, heating and air conditioning work. That covers typical conduit hangers, strut connections, and equipment mounting. For engineered structural connections where a drawing calls for a specific grade, verify the grade on the spec before you substitute.

No. The JHTB90 is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. If your federal, state, or institutional contract carries a domestic sourcing clause, these will not satisfy it and you need a domestically produced fastener instead.

A hex tap bolt is threaded the full length of the shank instead of having a plain grip section. That is why the JHTB90 is called out for complete thread engagement applications: when you are running into a tapped hole, a channel nut, or a thin bracket, full thread means every bit of the 5/8 inch length carries. If you need an unthreaded shoulder bearing against a shear plane, use a partially threaded cap screw instead.

The JHTB90 is steel with a zinc plated finish. Zinc gives moderate corrosion protection, fine for indoor and dry or occasionally damp interior work. For wet locations, exterior runs, or corrosive environments, step up to the 18-8 stainless version of the hex tap bolt rather than the zinc plated steel.

These ship in a jar of 100 pieces, and the jar is the order minimum, so 100 is the smallest quantity. Metallics lists other sizes and quantities by request if you need a different length or a bulk box.