Metallics JSHTB48D Bolts 1/2-13 x 1-1/4 Hx Tap Blt SS (Jar 50)

It's a 1/2-13 bolt, 13 threads per inch, which is standard UNC coarse for a 1/2 inch diameter. It will thread into any 1/2-13 tapped hole or standard coarse 1/2 inch hex nut. Threads are made to IFI-199 (2014).

They're 18-8 stainless steel, the standard austenitic grade used for general outdoor, damp, and washdown service. Fine for exterior strut, enclosures, and damp utility rooms. For constant salt spray or marine immersion, 316 stainless is the grade to step up to.

The stainless bolts run 95,000 psi minimum tensile and 60,000 psi minimum yield, with hardness of Rockwell B95-C32. That's solidly above a Grade 2 carbon bolt but below a Grade 5 or Grade 8 plated bolt. Where the load is structural and corrosion isn't the driver, a graded carbon steel bolt carries more; where moisture is the problem, the stainless is the right trade.

Yes. They're flagged both Buy American compliant and ARRA compliant, with United States country of origin, so they clear domestic-sourcing language on federally funded and public work.

Head width across flats measures 0.725 to 0.750 in., so a 3/4 inch wrench or socket is the fit. That's the normal hex size for a 1/2 inch bolt.

They ship 50 count in a jar, and 50 is the order minimum, so that jar is the smallest unit. Metallics does list other sizes and quantities in the HTB, JHTB, and JSHTB tap bolt series by request if 50 of this size isn't what you need.

It can be. 18-8 stainless threads are prone to galling when run against another stainless thread under speed or dry, which can seize the fastener before it's torqued. Run them in by hand or at low speed, and use an anti-seize on the thread. Keeping nut and bolt both stainless also avoids the dissimilar-metal corrosion you'd get pairing stainless with a plated carbon nut.