Stainless Steel ASTM A193 B8 B8m 304 316 Specification Standard Sizes Unc Types Bolts

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ASTM A193 Grade B8 B8M Heavy Hex Bolt

Yokelink ASTM A193 Grade B8 is a standard material specification for corosion resistant austenitic stainless steel fasteners, for use in high tensile high temperature and special purpose applications such as pressure piping & pressure vessels bolting. Grade B8 is a heat-treated, work hardened (or both) austenitic stainless steel further divided into class 1, class 2 & class 2B, each having a distinguished tensile strength ASTM A193 specification covers requirements for chemical composition, mechanical properies, hardness, heat-treatment and recommended nuts-washers for Grade B8 Fasteners.

A 193 B8 Heavy Hex Bolt Materials and Chemical Composition

Basic material: AISI 304 or 304L stainless steel (corresponding to UNS S30400/S30403), belonging to 18-8 type austenitic stainless steel 138.

Chemical composition:

A 193 B8 Heavy Hex Bolt Heat treatment and mechanical properties

Heat treatment process:

Solution annealing (Carbide Solution Treatment): Heating to 1100-1200°C and then cooling rapidly (such as water quenching) to dissolve carbides to improve corrosion resistance18.

Strain hardening (Strain Hardening): Class 2 and 2B increase strength through cold working or cold deformation to reduce the risk of bonding158.

Mechanical property classification:

Class 1: Solution treatment only, tensile strength ≥75 ksi (515 MPa), yield strength ≥30 ksi (205 MPa), hardness ≤223 HBW38.

Class 2: Solution + strain hardening, tensile strength 125 ksi (860 MPa, diameter ≤3/4 inch), yield strength 100 ksi (690 MPa), hardness ≤321 HBW358.

Class 2B: For larger diameters (e.g., ≤ 2 inches), the tensile strength is gradually reduced to 80 ksi (550 MPa), but the toughness is maintained at a high level8.

A 193 B8 Heavy Hex Bolt Product form and specifications

Type: covers bolts, studs, nuts, threaded rods, hexagonal head bolts, etc., supporting metric (M10-M110) and imperial (1/2"-4") sizes17.

Thread standards: including UNC, UNF, BSW, NPT, etc., to meet different connection requirements17.

Surface treatment: optional galvanizing, Dacromet, PTFE coating, passivation, etc., to enhance corrosion resistance or adaptability to specific environments

Buy A 193 B8 Heavy Hex Bolt From Yokelink

Yokelink as a trusted fastening solution expert in the global industrial field, we focus on precision manufacturing and innovative technology to create high-performance fastener products that are suitable for all scenarios. From high-temperature and high-pressure petrochemical plants to deep-sea energy platforms, from precision medical equipment to new energy infrastructure, our products are represented by the ASTM A193 B8 series, covering Class 1 (standard corrosion resistance), Class 2 (high-strength hardening) and Class 2B (super-large specification toughness optimization) grades, meeting the requirements of extreme working conditions from -200°C to 800°C.

Relying on the ISO 9001 quality system and full-process testing (hardness, tensile, salt spray testing), every bolt and nut is precisely up to standard. Supporting metric/imperial specifications, non-standard customization, and 72-hour fast delivery, we provide global customers with the peace of mind of "zero-hazard connection".

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