A2-70 Stainless Steel Bolt
A2-70 stainless steel bolts are fasteners made from austenitic stainless steel in the A2 material group and classified according to their mechanical strength. The A2-70 designation indicates an A2 stainless steel grade with a minimum nominal tensile strength of 700 MPa. These bolts offer a good combination of corrosion resistance, mechanical strength and durability, making them suitable for a wide range of general industrial and mechanical fastening applications.
We supply A2-70 stainless steel bolts in various sizes, lengths, thread configurations and product types, including hex bolts, flange bolts, anchor bolts, T-bolts, carriage bolts and U-bolts. Products can be manufactured according to applicable dimensional and material requirements, with customized specifications available for different industrial and OEM applications. Chemical composition, mechanical properties, dimensions and thread quality can also be inspected according to customer requirements.
Type of A2-70 Bolt:
A2-70 stainless steel bolts are available in various designs to meet different fastening and installation requirements. We supply a range of A2-70 bolt types, including hex bolts, flange bolts, anchor bolts, T-bolts, carriage bolts and U-bolts. Each type is designed for different connection configurations and applications, while custom sizes, lengths, thread specifications and configurations can be provided according to customer requirements.
Chemical Composition of A2-70 Bolt:
The chemical composition of A2-70 stainless steel bolts is specified according to ISO 3506-1. A2-70 bolts are manufactured from austenitic stainless steel within the A2 material group, commonly using 304 or 304L stainless steel materials depending on the required material specification and application. Our SS304 bolts can be supplied in various bolt types, sizes. Chromium and nickel are the principal alloying elements that contribute to the corrosion resistance and austenitic structure of these materials. The chemical composition is controlled to meet the applicable requirements of ISO 3506-1, helping ensure consistent material quality and mechanical performance. .The table below shows the chemical composition requirements for A2 stainless steel used in A2-70 bolts according to ISO 3506-1.
| Stainless Steel Grade | Chemical Compistion | |||||||||
| C(max) | Si(max) | Mn(max) | P(max) | S(max) | Cr | Mo | Ni | Cu(max) | N | |
| A2-70 | 0.1 | 1 | 2 | 0.05 | 0.03 | 15.0~20.0 | / f | 8.0~19.0 | 4 | / |
Mechanical Property of A2-70 Bolt:
The mechanical properties of A2-70 stainless steel bolts are specified according to ISO 3506-1. The A2-70 strength class requires a minimum tensile strength of 700 MPa, providing a balance of strength and corrosion resistance for a wide range of fastening applications. The standard also specifies minimum requirements for stress at 0.2% non-proportional elongation and elongation after fracture, which are used to evaluate the load-bearing capacity and ductility of the fastener material. The main mechanical property requirements for A2-70 bolts are shown in the table below.The table below shows the chemical composition requirements for A2 stainless steel used in A2-70 bolts according to ISO 3506-1.
| Property Class | Tension Strength(min)MPA | Stress at 0.2% non-proprotional elongation(min)MPA | Elongation after fracture(min)mm |
| A2-70 | 700 | 450 | 0.4d |
Application of A2-70 Bolt:
Machinery & General Industrial Equipment
A2-70 stainless steel bolts are widely used in machinery, manufacturing equipment, pumps, fixtures and general industrial assemblies where reliable fastening and good resistance to moisture and common corrosive conditions are required. Hex bolts, flange bolts, carriage bolts and other A2-70 configurations can be selected according to the equipment design and connection requirements. The combination of corrosion resistance and a minimum nominal tensile strength of 700 MPa makes A2-70 suitable for many general mechanical fastening applications.
Construction, Outdoor & Architectural Applications
A2-70 bolts are suitable for construction, outdoor equipment, architectural components, railings, fixtures and other installations exposed to normal weather and moisture. Stainless steel provides durable corrosion resistance without relying on a protective coating, making A2-70 bolts suitable for applications where appearance and long-term surface condition are also important. Different bolt designs, dimensions and thread configurations can be supplied for structural and installation requirements.
Food Processing & Water Treatment Equipment
A2-70 stainless steel bolts are commonly used in food processing machinery, water treatment equipment, tanks, conveyors and other processing systems where resistance to moisture and ease of maintenance are important. The stainless steel surface is suitable for applications requiring durable and clean fastening components. For equipment exposed to seawater, high chloride concentrations or more aggressive corrosive media, A4 stainless steel fasteners may be considered where higher corrosion resistance is required.