A2-80 Stainless Steel Bolts
A2-80 stainless steel bolts are designed for fastening applications that require a combination of high strength, corrosion resistance and long-term durability. Compared with standard A2-70 bolts, A2-80 provides a higher strength level, with a minimum tensile strength of 800 MPa. A2-80 bolts are commonly manufactured from 304 or 304L stainless steel and cold worked to achieve their higher mechanical strength while maintaining the corrosion resistance associated with A2 stainless steel. This makes A2-80 a suitable option for applications where a stronger stainless steel bolt is required without changing to a different stainless steel material group. For more information about our 304 stainless steel fasteners, see our SS304 bolts.
A2-80 stainless steel bolts are commonly used for machinery, industrial equipment, construction and other applications where dependable fastening performance is important. They can be used in different bolt designs and supplied in a range of diameters, lengths and thread specifications to suit different assembly requirements. The choice of A2-80 depends on factors such as the required strength, fastening dimensions and working environment.
Type of A2-80 Bolt:
A2-80 stainless steel bolts are available in different designs to meet fastening requirements where higher mechanical strength and corrosion resistance are both important. We supply A2-80 bolts in a range of types, including hex bolts, flange bolts, anchor bolts, T-bolts, carriage bolts and U-bolts. Different bolt types can be supplied in various diameters, lengths and thread specifications, with standard and custom sizes available according to the requirements of the application.
Chemical Composition of A2-80 Bolt:
The chemical composition of A2-80 stainless steel bolts is specified according to ISO 3506-1. A2 is an austenitic stainless steel grade for corrosion-resistant fasteners, with chromium and nickel as the main alloying elements. The chemical composition requirements control elements such as carbon, silicon, manganese, phosphorus, sulfur, chromium, nickel and copper to provide the required material characteristics for A2 stainless steel fasteners. A2-80 and A2-70 belong to the same A2 material group, so their main difference is the mechanical property class rather than the basic chemical composition. The chemical composition requirements for A2 stainless steel used in A2-80 bolts are shown in the table below.
| Stainless Steel Grade | Chemical Compistion | ||||||||||
| C(max) | Si(max) | Mn(max) | P(max) | S(max) | Cr | Mo | Ni | Cu(max) | N | g,h | |
| A2-80 | 0.1 | 1 | 2 | 0.05 | 0.03 | 15.0~20.0 | / f | 8.0~19.0 | 4 | / | |
Mechanical Property of A2-80 Bolt:
The mechanical properties of A2-80 stainless steel bolts are specified according to ISO 3506-1. The “80” in the A2-80 designation represents a minimum tensile strength of 800 MPa, while the minimum stress at 0.2% non-proportional elongation is 600 MPa. Compared with A2-70, which has a minimum tensile strength of 700 MPa and a 0.2% non-proportional elongation stress of 450 MPa, A2-80 provides a higher strength level for applications requiring greater load-bearing capability. The standard also specifies a minimum elongation after fracture of 0.3d for A2-80 fasteners. The main mechanical property requirements are shown in the table below.
| Property Class | Tension Strength(min)MPA | Stress at 0.2% non-proprotional elongation(min)MPA | Elongation after fracture(min)mm |
| A2-80 | 800 | 600 | 0.3d |
Application of A2-80 Bolt:
Machinery & Industrial Equipment
A2-80 stainless steel bolts are suitable for machinery, industrial equipment and mechanical assemblies where higher fastening strength is required together with good corrosion resistance. They can be used for equipment components, machine frames, brackets, fixtures and other mechanical connections exposed to moisture or common industrial environments. The higher strength level of A2-80 makes it a suitable choice when A2-70 bolts do not provide the required mechanical strength.
Construction & Outdoor Equipment
A2-80 bolts can be used in construction equipment, outdoor installations, fixtures, railings and other applications where stainless steel fastening components are exposed to moisture and changing weather conditions. Their combination of 800 MPa minimum tensile strength and corrosion resistance provides durable fastening for applications requiring a stronger stainless steel bolt. Different diameters, lengths and thread specifications can be selected according to the installation and load requirements.
Equipment & Processing Systems
A2-80 stainless steel bolts are also suitable for equipment and processing systems where both strength and resistance to moisture are important. They can be used in food processing machinery, water treatment equipment, pumps, tanks, conveyors and other industrial systems. For applications involving seawater or high chloride exposure, A4 stainless steel fasteners may be more appropriate because they provide higher corrosion resistance.