Metallics JMSBHC820316 Bolts M8 x 20 HXBT SS (Jar 100)

It's an M8 coarse thread with a 1.25 mm pitch, dimensioned to DIN 933 and threaded to ISO 724 and ISO 965-1. So it mates with any standard M8-1.25 nut or tapped hole. If your equipment uses M8 x 1.0 fine thread, this is the wrong bolt.

316 stainless is the marine-grade choice, and that's what these M8 x 20 bolts are made of, classified A4 under ISO 3506. The molybdenum in 316 gives it better chloride and pitting resistance than 18-8 (A2), which is why it's specified for coastal, rooftop, pool, and wash-down environments.

These ship 100 to a jar, and 100 count is the order minimum, so the jar is the unit. Metallics does offer other sizes and quantities of this hex bolt by request.

The record flags the JMSBHC820316 as both ARRA compliant and Buy American compliant, with China listed as the country of origin. On federally funded work, give both of those to your compliance reviewer, since the applicable provision on your contract determines whether an imported stainless fastener is acceptable.

No. The jar contains hex head bolts only, 100 of them. Order M8 nuts and flat or lock washers separately, and keep them in 316 stainless as well. Mixing a plated carbon steel nut onto a 316 bolt in a wet location sets up galvanic corrosion and defeats the reason you bought stainless.

A2 (18-8) is fine for general indoor and dry exterior use and costs less. Go to A4, which is what this M8 x 20 bolt is, when chlorides are present: coastal air, de-icing salt, chemical or food wash-down, pool rooms. Note that stainless fasteners are not strength-graded like an 8.8 or Grade 5 carbon bolt, so don't substitute them into a high-tensile structural joint.