Metallics JSBH334 Bolts 1/2-13 X 2-1/4 Hxbt SS (Jar 50)

316 stainless steel. The molybdenum in 316 gives it better corrosion resistance than 18-8 and better strength at elevated temperatures, which is why it gets specified for coastal, wash-down, and chemical-exposure work rather than dry interior fastening. If you are matching existing 18-8 hardware on the same assembly, be aware you are mixing alloys even though both are austenitic.

It is 13 threads per inch, which is standard UNC coarse thread for a 1/2 inch bolt, so it mates with any standard 1/2-13 coarse nut or tapped hole. Shank outside diameter runs 0.4930 to 0.5000 inch. For a 316 stainless assembly, pair it with 316 nuts and washers so you are not setting up a dissimilar-metal joint.

This one is rated 100,000 to 150,000 psi minimum tensile and 65,000 psi minimum yield, with hardness Rockwell B95-C32. That is in the range of a grade 5 steel bolt but below a grade 8. You buy 316 for corrosion performance, not for maximum strength, so if the connection is purely structural and dry, a higher-grade carbon bolt carries more load; if it is wet, coastal, or chemically exposed, the stainless is the right call.

No. They are not Buy American compliant and not ARRA compliant, with country of origin listed as multiple. On a federally funded or state project carrying domestic-sourcing language, you will need a domestically produced 1/2-13 stainless hex bolt instead. Specify the same 316 alloy if the corrosion environment is what drove the spec.

Order it as Metallics JSBH334, from the SBHC and JSBHC hex bolt series. The J prefix is the jar-packed version of the same bolt. Metallics also offers other sizes and quantities in this series on request if 1/2-13 x 2-1/4 is not the size you need.