ASME SA193 Studs and Bolts

SA193 is a specification growing in popularity. Technical Threads stocks and supplies a variety of SA193 materials. SA193 is an ASME spec, often considered to be a sister spec to A193. Similar to A193, SA193 bolting is often found in heavy process industries. It is commonly found on the pressure equipment the plants rely on, such as boilers, heat exchangers, tanks and other pressure vessels. SA193 B7 Heavy Hex bolts and SA193 B7 Studs are the most common SA fasteners.

UN8 is the standard spec above 1″, but UNC SA193 is also supplied.

Common material grades in SA193 include:

ASME SA193 B7 Alloy steel, AISI 4140/4142 quenched and tempered
ASME SA193 B7M Alloy steel, AISI 4140/4142 quenched and tempered (scroll down for more information on B7M)
ASME SA193 B16 Alloy steel, higher temp service than B7 with vanadium
ASME SA193 B8 Class 1 Stainless steel, AISI 304, carbide solution treated.
ASME SA193 B8M Class 1 Stainless steel, AISI 316, carbide solution treated.
ASME SA193 B8 Class 2 (Class II) Stainless steel, AISI 304, carbide solution treated, strain hardened
ASME SA193 B8M Class 2 (Class II) Stainless steel, AISI 316, carbide solution treated, strain hardened

Technical Threads stocks both B7 and B8 material in SA193 and SA194.

Additionally, we supply metric bolting to SA193M, and SA194M. Note that SA193M and SA194M signify metric sizes. B7M and 2HM are something completely different (see below).

ASME SA193 B7M is a modified version of B7 that is used for “sour service” (NACE MR0175) applications for environments exposed to the H2S (hydrogen sulfide). It’s common on flanges, vessels, valves, pumps, etc. etc. B7M is often found on pots, tanks, boilers, heat exchangers, and other pressure vessels, especially in the oil/gas industry.