Metallics SBH674 Bolts 5/8-11 X 2 Hxbt SS (Box 25)

The SBH674 is 316 stainless steel. The molybdenum in 316 gives it better corrosion resistance than 18-8 and better strength at elevated temperature, which is why it gets specified for coastal, wash-down, and chemical exposure rather than dry indoor work. Both alloys are austenitic, so neither is magnetic hardened steel.

It is 5/8-11, 11 threads per inch, which is the standard UNC coarse pitch for 5/8 inch. Any standard 5/8-11 coarse nut or tapped hole mates with it. Measured shank diameter runs 0.6170 to 0.6250 inches. For a stainless bolt, use a stainless nut of matching alloy and anti-seize on the threads to avoid galling.

Tensile runs 100,000 to 150,000 psi minimum with 65,000 psi minimum yield, and hardness is Rockwell B95 to C32. That puts it in the same broad tensile range as common plated carbon grades, but you are buying it for corrosion performance, not for maximum strength. If your drawing calls out a specific SAE or ASTM structural grade, verify that callout rather than substituting stainless on strength alone.

No. The SBH674 is not Buy American compliant and is not ARRA compliant, and country of origin is listed as multiple. On federally funded or domestic-content jobs you need a domestic-origin fastener instead, so check the spec before you order these for public work.

Overall fastener length is 2 inches measured under the head. Subtract the nut height and any washers from that to get your usable grip. On a 5/8-11 assembly that leaves roughly an inch and a quarter of material before the nut runs out of thread, so it suits strut, channel, and bracket stacks rather than deep timber or thick flange pairs. For thicker joints, step up to a longer length in the same SBHC series.

Metallics lists the field application as the electrical, plumbing, heating and air conditioning industries. In practice that means hanging strut and channel, anchoring equipment pads, rooftop mechanical curbs, pipe supports, and panel and enclosure mounting where moisture is a factor. For structural steel connections, work to the structural bolt grade named on the drawings rather than a general-purpose stainless hex bolt.

They ship in a box of 25, and the imperial order minimum is 100 count. So the smallest practical buy is four boxes. Metallics also makes other sizes and quantities in this line available by request if 5/8-11 x 2 is not the length you need.