Metallics JSBH40 Bolts 1/2-13 X 2-3/4 Hxbt SS (Jar 50)

It is a 1/2-13 hex bolt, 13 threads per inch, which is standard UNC coarse thread for 1/2 inch diameter. Any 1/2-13 UNC nut or tapped hole mates with it. The measured outside diameter runs 0.4930 to 0.5000 inch, so it drops through a 9/16 inch clearance hole without reaming.

The JSBH40 is 18-8 stainless steel. Both 18-8 and 316 are austenitic alloys and both resist general atmospheric corrosion, but 316 is the one specified where chloride exposure is in play, such as coastal or heavy wash-down service. For general outdoor, chemical, and food-processing equipment work, 18-8 is the usual call.

No. The JSBH40 is a corrosion-resistant stainless fastener, with tensile strength of 100,000 to 150,000 psi minimum and yield strength of 65,000 psi minimum. That yield is well below a Grade 5 or Grade 8 steel bolt, so it is not a substitute where a structural or high-torque grade is called out on the drawing. Specify it where corrosion resistance drives the choice, not clamp load.

They ship 50 to a jar, and 50 pieces is the order minimum, so the jar is the smallest unit. The jar pack keeps loose 1/2 inch hardware together on a service truck rather than rolling around a bin. Metallics notes other sizes and quantities are available by request.

Hex head, driven with a wrench or socket, not an Allen key. The head measures 0.736 to 0.750 inch across the flats, which is the normal 3/4 inch wrench size for a 1/2 inch bolt, so standard 3/4 inch sockets and open-end wrenches fit.

Hardness on the JSBH40 runs Rockwell B95 to C32. Austenitic stainless at that hardness is prone to thread galling against a stainless nut when driven fast and dry, so run it in slowly or use an anti-seize on the thread. That is a handling matter, not a defect in the fastener.