Metallics JSBH670 Bolts 5/8-11 X 1 Hxbt SS (Jar 25)

The JSBH670 is 316 stainless steel. The molybdenum in 316 gives it greater corrosion resistance than 18-8 and better strength at high temperatures, which is why it gets specified for coastal, wash-down, and chemical exposure rather than dry interior work. If your spec only calls for general corrosion resistance indoors, 18-8 is the usual lower-cost choice.

It is a 5/8-11 hex bolt: 11 threads per inch, which is standard UNC coarse for 5/8 inch. Measured shank outside diameter runs 0.6170 to 0.6250 inch, so it mates with any standard 5/8-11 nut or tapped 5/8-11 hole. Thread length is short here, since the bolt is only 1 inch long overall under the head.

Overall length under the head is 1 inch, so once you allow for a nut and washer you are clamping thin stock, strut, plate, or channel, not a deep stack. If you need to pull through two pieces of unistrut plus a washer set, step up to a longer length; other sizes and quantities are available by request.

No. The JSBH670 is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. If your project has domestic sourcing language in the contract, this part will not satisfy it and you need a domestic-marked stainless hex bolt instead.

Across the flats the head measures 0.922 to 0.938 inch, so a 15/16 inch socket or wrench is the fit. Head height is 25/64 inch, and across the corners the head runs 1.051 to 1.083 inch, which matters if you are working in a tight pocket or counterbore.

Tensile runs 100,000 to 150,000 psi minimum with 65,000 psi minimum yield, and hardness is Rockwell B95 to C32. That is solid for stainless, but it is not a substitute for a heat treated alloy bolt where a drawing calls out SAE grade 5 or grade 8 by name. Pick 316 when corrosion drives the choice, pick an alloy grade when the clamp load does.

They ship in jars of 25. The order minimum is 100 jars, so this is a stocking buy for an MRO crib or a distributor shelf rather than a handful for one job. Each jar as supplied weighs in at 6945 g.

The jar contains hex bolts only. Nuts, flat washers, and lock washers are ordered separately, and if you are staying in 316 for corrosion reasons you want the mating hardware in 316 as well rather than mixing in plated steel, which will corrode first and defeat the purpose.

Metallics lists the field application as the electrical, plumbing, heating and air conditioning industries. In practice that means strut and channel hardware, equipment and enclosure mounting, hanger assemblies, and rooftop or mechanical room work where a plated bolt would rust out. The 316 alloy is the reason it holds up in damp, salt, or chemically aggressive locations.