ASTM A193 B8 bolts with A194 B8 Nuts
- Reliability in the Most Severe Environments
- Long Service Life and Low Maintenance Costs
- Stable Performance in Weld‑Affected Zones
ASTM A193 B8 Bolts with ASTM A194 B8 Nuts Supplier
SSM provides ASTM A193 B8 bolts paired with ASTM A194 B8 heavy hex nuts, manufactured from austenitic stainless steel (Type 304). These fastening sets are designed for corrosion-resistant bolting applications in mildly corrosive and elevated-temperature environments, offering reliable mechanical performance and secure flange connections for chemical, food processing, marine, and general industrial service.
- Bolt Diameter: 1/2″ to 4″
- Bolt Length: 50 mm to 1000 mm (custom cutting per drawing)
- Type de fil : Full thread or double-end thread; UNC or UNF as required
- Nut Type: ASTM A194 B8 heavy hex nuts; one or two nuts per bolt
- Surface Finish: Plain (natural stainless), passivated, PTFE / Xylan / Teflon coating
ASTM A193 B8 Class Options
ASTM A193 B8 Class 1
- Solution-annealed condition
- Standard strength level
- Suitable for general corrosion-resistant bolting applications
- Commonly supplied with ASTM A194 B8 nuts
ASTM A193 B8 Class 2
- Cold-worked after solution annealing
- Higher tensile and yield strength than Class 1
- Recommended where higher preload and improved load-carrying capacity are required
- Typically matched with ASTM A194 B8 nuts
ASTM A193 B8 / ASTM A194 B8 Fasteners Technical Data
Material Overview
- Matériau du boulon : ASTM A193 Grade B8
- Nut Material: ASTM A194 Grade B8
- Base Material: Austenitic stainless steel (Type 304 / UNS S30400)
- Magnetic: Non-magnetic in annealed condition (may become slightly magnetic after cold working)
Class Designation (ASTM A193 B8 Bolts)
| Classe | Condition | Caractéristiques principales | Typical Application |
| Classe 1 | Solution annealed | Standard strength, excellent corrosion resistance | General stainless bolting |
| Classe 2 | Cold worked after solution annealing | Higher tensile & yield strength | Higher preload / higher stress joints |
Chemical Composition (Typical, % max unless noted)
| Élément | Carbone (C) | Manganèse (Mn) | Phosphore (P) | Soufre (S) | Silicium (Si) | Chrome (Cr) | Nickel (Ni) | Fer (Fe) |
| B8 (304 SS) | ≤ 0,08 | ≤ 2,00 | ≤ 0,045 | ≤ 0,030 | ≤ 1,00 | 18,0 – 20,0 | 8,0 – 11,0 | Équilibre |
Mechanical Properties – Bolts (ASTM A193 B8)
| Propriété | Classe 1 | Classe 2 |
| Résistance à la traction | min. 515 MPa (75 ksi) | min. 690 MPa (100 ksi) |
| Limite d'élasticité (0,2%) | min. 205 MPa (30 ksi) | min. 450 MPa (65 ksi) |
| Élongation | ≥ 30% | ≥ 20% |
| Réduction de la superficie | ≥ 50% | ≥ 35% |
Mechanical Properties – Nuts (ASTM A194 B8)
| Propriété | Exigence |
| Proof Load Stress | ≥ 380 MPa (55 ksi) |
| Dureté | ≤ 223 HB |
| Traitement thermique | Solution annealed |
Nuts are suitable for mating with both B8 Class 1 and Class 2 bolts.
ASTM A193 B8 / ASTM A194 B8 Fasteners Applications
ASTM A193 B8 bolts used with ASTM A194 B8 heavy hex nuts are widely applied in corrosion-resistant, non-chloride, and moderate-temperature service, where stainless steel fasteners are preferred over alloy steel.
- B8 Class 1 is suitable for standard corrosion-resistant bolting applications.
- B8 Class 2 is recommended where higher preload and increased mechanical strength are required.
- Not recommended for high-chloride or severe stress corrosion cracking environments—use B8M (316 SS) instead.
- Recommended Service Temperature: jusqu'à 425 °C (800 °F)
- Low-temperature performance: Good toughness, suitable for cryogenic service
- Non recommandé for chloride-rich or high-stress SCC environments (use B8M / 316 SS instead)
Fournisseur unique de fixations pour tous vos besoins
SSM has significant product advantages in manufacturing ASTM A193 B8 / ASTM A194 B8 Fasteners. Whether it’s quality or price, we will meet your needs.
ASTM A193 B8 / ASTM A194 B8 Fasteners Standards and Specifications
| Catégorie | Standard / Specification | Description |
| Bolt Material Standard | ASTM A193 Grade B8 (Class 1 / Class 2) | Austenitic stainless steel (Type 304) stud bolts / hex bolts |
| Nut Material Standard | ASTM A194 Grade B8 | Austenitic stainless steel heavy hex nuts |
| Washer Standard (Optional) | ASTM F436 (Type 304 SS or special SS as agreed) | Flat washers when specified (carbon steel F436 not recommended for SS assemblies) |
| Thread Standard | ASME B1.1 | UNC / UNF thread form |
| Stud Bolt Dimensions | ASME B18.31.2 | Dimensional requirements for stud bolts |
| Hex Bolt Dimensions (if applicable) | ASME B18.2.1 | Dimensional requirements for hex head bolts |
| Heavy Hex Nut Dimensions | ASME B18.2.2 | Dimensional requirements for heavy hex nuts |
| Propriétés mécaniques | ASTM A193 / ASTM A194 | Tensile, yield, hardness, and proof load requirements |
| Flange Compatibility | ASME B16.5 / ASME B16.47 | Pressure flange bolting requirements |
| Traitement de surface | ASTM A967 / ASTM A380 | Passivation / chemical cleaning of stainless steel |
| PTFE / Xylan Coating | Per customer specification | Anti-galling, anti-corrosion, low-friction coating |
| Inspection & Testing | ASTM A193 / ASTM A194 | Mechanical testing, marking, heat number traceability |
| Service Temperature | ≤ 425 °C (800 °F) | Suitable for elevated-temperature stainless steel service |
ASTM A193 B8 stud bolts combined with ASTM A194 B8 heavy hex nuts are corrosion-resistant austenitic stainless steel fasteners designed for service in mildly corrosive and elevated-temperature environments. Manufactured from Type 304 stainless steel, these fasteners provide reliable tensile strength, stable proof load performance, and secure flange connections in industrial systems where corrosion resistance is critical.
These bolting sets are produced in accordance with ASTM material standards, with UNC/UNF threads per ASME B1.1 and dimensional compliance to the ASME B18 series. Surface conditions typically include plain (natural stainless), passivated finish, or PTFE / Xylan coatings to reduce galling and improve installation performance.
Applications include ASME B16.5 / ASME B16.47 flanges, pressure vessels, piping systems, valves, pumps, chemical and petrochemical plants, food and pharmaceutical facilities, power generation auxiliaries, and general industrial equipment. Recommended service temperature is up to approximately 425 °C (800 °F), making ASTM A193 B8 / A194 B8 fasteners a dependable choice for corrosion-resistant, pressure-containing joints.
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ASTM A193 B8M Bolts with A194 B8M Nuts
Reliability in the Most Severe Environments Long Service Life and Low Maintenance Costs Stable Performance in Weld‑Affected Zones ASTM A193
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