Metallics JSBH78D Bolts 3/8-16 x 7/8 HXBT SS (Jar 100)

They are made from 18-8 stainless steel, which covers general atmospheric corrosion resistance, the reason these are common in chemical and food-processing equipment. 18-8 is an austenitic alloy. Harsher chemical exposure can call for 316 stainless or other specialty materials plus added precautions, so for aggressive chemical service step up rather than relying on 18-8.

Tensile strength runs 100,000 to 150,000 psi minimum with a 65,000 psi minimum yield, and hardness is Rockwell B95 to C32. That is typical stainless cap screw territory, fine for equipment mounting, enclosure and strut work, and general machinery fastening. Structural steel connections that call out a specific bolt specification on the drawing should be filled with the grade named there, not substituted on strength numbers alone.

It is a hex bolt with 20 threads per inch, so it mates with any standard UNC nut or tapped hole of the matching diameter. Outside diameter over the threads is 0.2450 to 0.2500 inch. Pair it with stainless nuts and washers of the same alloy family to avoid mixing metals at the joint.

Head width measures 0.428 to 0.438 inch across the flats, so a 7/16 inch wrench or socket seats on it. Head height is in the 0.150 to 0.163 inch range, which is shallow enough to clear most strut channel and enclosure flanges without a deep socket.

They ship in a jar of 100, and the order minimum is 100 count. That is the sell unit, so the jar is what lands on the truck for a single line. Metallics lists other sizes and quantities as available by request if a job needs a different length or a bulk box instead of the jar.

No. Buy American Compliant is listed as No and ARRA Compliant as N, so they should not be submitted against a project with those procurement requirements even though country of origin is shown as United States. For a federally funded job, source a fastener that carries the compliance flags outright.

Both are austenitic stainless. 18-8, the alloy used in these Metallics hex bolts, handles general atmospheric corrosion and is the usual choice on chemical and food-processing equipment. 316 is the move when the environment is more aggressive, such as chlorides, washdown chemistry, or salt exposure, where 18-8 alone is not enough and extra precautions are called for.