Metallics JSBH81D Bolts 1/2-13 x 3/4 HXBT SS (Jar 50)

Head height is 0.302 to 0.323 inch. At 3/4 inch overall shank length, that leaves you very little grip, so this length suits thin material, strut, or bolting into a tapped hole rather than stacking washers and a thick clamped joint. If your stack-up is more than about half an inch, step up to a longer bolt in the same SBHC/JSBHC series.

These are 18-8 stainless steel, which is the austenitic grade used where general atmospheric corrosion resistance is needed, including chemical and food-processing equipment. For aggressive chemical exposure, 316 stainless or a specialty alloy is the better call. 18-8 is non-magnetic in the annealed condition and is not heat treated to a high-strength grade, so it's a corrosion choice rather than a strength choice.

No, don't swap one for the other on a structural or load-rated connection. The 18-8 stainless hex bolt lists 100,000 to 150,000 psi minimum tensile and 65,000 psi minimum yield, with hardness Rockwell B95 to C32. A Grade 5 carbon bolt is specified at 120,000 psi tensile and 92,000 psi yield, so the yield here is well below it. Use stainless where corrosion drives the choice and the joint loads are modest.

Across-flats width is 0.736 to 0.750 inch, so a 3/4 inch wrench or socket fits. Across-corners the head measures 0.840 to 0.866 inch, which is what matters if you're working inside a tight pocket or counterbore.

Part JSBH81D ships as a jar of 50. The imperial order minimum is 100 count, so plan on two jars as the smallest buy. Other sizes and quantities in the series are available by request.

They do not. The JSBH81D hex bolt is flagged as not Buy American compliant and not ARRA compliant, even though country of origin is listed as United States. If your contract carries a domestic-sourcing clause, get the compliance letter in writing before you spec it.

The jar contains hex bolts only. Nuts and washers are separate line items, so if you're bolting through rather than into a tapped hole, add 1/2-13 stainless hex nuts and matching 1/2 inch washers to the order. Keep the nut in the same 18-8 stainless to avoid mixing metals in a corrosive location.

Yes. 18-8 stainless is austenitic, and austenitic stainless galls when a stainless bolt is run into a stainless nut under speed or dry. Run them in slowly, by hand where you can, and use an anti-seize on the threads. The listed hardness, Rockwell B95 to C32, tells you this is a relatively soft fastener, so an impact driver is the fastest way to strip one.