Metallics JSBH354 Bolts 1/2-13 X 4 Hxbt SS (Jar 50)

The JSBH354 is 316 stainless steel. The molybdenum in 316 gives it better corrosion resistance than 18-8 and better strength at high temperatures, which is why it gets specified for coastal, wash-down, and chemical-exposure work rather than plain indoor framing.

It is a 1/2-13 bolt, so 13 threads per inch, which is standard UNC coarse for 1/2 inch. Any 1/2-13 coarse nut or tapped hole will take it. Measured shank diameter runs 0.4930 to 0.5000 inch.

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 below a Grade 5 carbon bolt (120,000 psi tensile) on strength, so if the drawing calls a specific SAE grade for a structural connection, 316 stainless is a corrosion choice rather than a strength substitute. Do not swap it into a Grade 8 location.

No. The jar is 50 hex bolts only. Order 1/2-13 316 stainless hex nuts and flat washers separately, and keep them in 316 as well, since mixing a carbon steel nut onto a stainless bolt in a wet location sets up galvanic corrosion at the joint.

No. The JSBH354 is not Buy American compliant and not ARRA compliant, and country of origin is listed as multiple. For a job with domestic-sourcing language in the spec, you need a domestic-certified fastener instead.

Head width across flats measures 0.736 to 0.750 inch, so a 3/4 inch socket or wrench is the fit. It is a standard hex head, no washer face flange to clear.

Packed 50 to a jar, and 50 each is the order minimum, so one jar is the smallest buy. Jar packaging keeps them together on a service truck instead of loose in a bin. Other sizes and quantities can be requested.

Metallics lists the field application as electrical, plumbing, heating and air conditioning work. In practice that is strut and trapeze hangers, equipment pads, pipe clamps and rooftop or mechanical-room anchorage where a plated bolt would rust out. The 316 alloy is the reason it shows up on rooftop and coastal mechanical jobs.