Metallics JSBH991 Bolts 3/4-10 x 1-1/2 HXBT SS (Jar 25)

It is made from 316 stainless steel. The molybdenum in 316 gives it greater corrosion resistance than 18-8 stainless plus better strength at elevated temperatures, which is why it gets specified for marine air, chemical exposure, washdown areas, and rooftop work where plated carbon steel would rust out.

Tensile strength runs 85,000 to 140,000 psi minimum with a yield of 45,000 psi minimum, and hardness falls in the Rockwell B80 to C32 range. That is typical austenitic stainless territory: corrosion resistance first, with lower yield than a hardened alloy cap screw. If your connection is calculated on a Grade 5 or Grade 8 carbon steel value, do not swap a stainless bolt in without rechecking the load.

No. The JSBH991 is not Buy American compliant and is not ARRA compliant, with multiple countries of origin. If your job carries a domestic sourcing requirement, you need a domestically produced 3/4-10 stainless bolt instead.

Across-flats width on the hex head measures 1.100 to 1.125 inch, so a 1-1/8 inch wrench or socket is the fit. Head height is 15/32 inch, which is worth knowing if you are working in a shallow recess or under a channel strut.

They ship in a jar of 25. The stated order minimum is 100 jars, so this is a stocking quantity rather than a single-jar counter purchase. Other sizes and quantities are available by request.

At 1-1/2 inches of length under the head, the JSBH991 suits relatively thin stack-ups. Budget for the combined thickness of your parts plus washer and nut, and remember the 3/4-10 coarse thread needs enough engagement past the nut face. For thicker assemblies, longer lengths in the same series are available by request.

Both are austenitic stainless cap screws, so both are non-magnetic-grade corrosion resisters rather than hardened steel. The difference is molybdenum: 316 resists corrosion better than 18-8 and holds strength better at high temperature. The JSBH991 is the 316 version. If the fastener is indoors and dry, 18-8 in the same series covers it; for coastal, chemical, or high-heat service, go 316.

Metallics lists this bolt for the electrical, plumbing, heating and air conditioning industries. In practice that means anchoring strut and equipment supports, hanging pipe and duct, and mounting gear where the fastener sees moisture or chemicals and a plated bolt would not hold up.