ASTM A193 B5 is a high-temperature stainless steel (AISI 501 stainless steel) bolting specification for extreme applications in heavy industry. ASTM A194 Grade 3 nuts (AISI 501 stainless steel) are the corresponding nut. Grade B5 studs and Grade B5 heavy hex bolts are 4 to 6 % chromium.

These specs are typically found in flanged piping applications with corrosive elements present under high temperatures.

These studs are typically cut-to-order per application.

Like other ASTM A193 fasteners, typically ASTM A193 Grade B5 and ASTM A194 Grade 3 nuts are supplied in UN8 (8 pitch) rather than UNC.

Please contact us today for your B5 fastener inquiry– we offer quick shipments per your job requirements!