A4-70 Stainless Steel Hex Bolt
A4-70 Stainless Steel Hex Bolts are manufactured from A4 stainless steel, which is equivalent to the 316 stainless steel grade and provides excellent corrosion resistance in demanding environments. Through cold working processes, these fasteners achieve improved mechanical properties with a minimum tensile strength of 700 MPa, making them a reliable choice for applications requiring both corrosion resistance and enhanced strength.
With superior resistance to moisture, chemicals, and marine environments, A4-70 Hex Bolts are widely used in industries where long-term durability is essential. Available in various sizes, thread configurations, and surface finishes, these stainless steel hex bolts provide dependable fastening solutions for marine equipment, chemical processing facilities, outdoor structures, and general industrial applications.
Specification of A4-70 Bolt:
A4-70 Stainless Steel Hex Bolts are specified according to ISO 3506 requirements for stainless steel fasteners, which define the material groups, chemical composition, and mechanical properties of corrosion-resistant fasteners. A4 stainless steel belongs to the austenitic stainless steel family and contains chromium, nickel, and molybdenum elements to provide enhanced corrosion resistance. The A4-70 property class requires a minimum tensile strength of 700 MPa.
For dimensional requirements, A4-70 Hex Bolts are commonly manufactured according to DIN 933 for fully threaded hex bolts and DIN 931 for partially threaded hex bolts. These standards define key dimensions including thread diameter, pitch, head width across flats, head height, and bolt length to ensure compatibility with standard nuts and assemblies.
A4-70 Stainless Steel Hex Bolts can be supplied with different surface finishes according to application requirements. Common surface treatments include cleaning and bright finishing, as well as passivation treatment to improve the natural corrosion resistance of stainless steel and provide a clean, durable surface condition.
| Product name | A4-70 Hex Bolt |
|---|---|
| Bolt Type: | Hex Head Bolt |
| Thread: | M5-M48 |
| Thread Type: | Metric Coarse/Fine Thread |
| Length: | Metric: Up to 800mm |
| Standard: | ISO3506 |
| Material: | SS316 |
| Tension Strength: | 700 MPa (min) |
| Dimension Standards: | DIN931/DIN933/ISO4017/ISO4014 |
Applications of A4-70 Stainless Steel Hex Bolts:
A4-70 Stainless Steel Hex Bolts are widely used in applications where corrosion resistance, durability, and reliable fastening performance are required. Due to their A4 stainless steel composition, which provides improved resistance to moisture, chemicals, and chloride environments, these bolts are suitable for outdoor and demanding industrial conditions where standard carbon steel fasteners may not provide sufficient service life.
Common applications include marine equipment, shipbuilding, coastal structures, chemical processing facilities, food processing equipment, water treatment systems, outdoor machinery, and general industrial installations. With stable mechanical properties and excellent corrosion resistance, A4-70 Hex Bolts are a preferred fastening solution for OEM manufacturers, engineering contractors, and industrial users requiring long-term performance in challenging environments.
Quality Control of A4-70 Stainless Steel Hex Bolts:
Quality control is integrated throughout the production process of A4-70 Stainless Steel Hex Bolts to ensure consistent quality, dimensional accuracy, and reliable performance. From incoming A4 stainless steel raw material inspection to final shipment, each production stage is controlled according to customer requirements and applicable stainless steel fastener standards.
During manufacturing, we conduct material verification, dimensional inspection, thread inspection, and mechanical property testing to ensure compliance with ISO 3506 requirements. Production processes including cold heading, thread rolling, cleaning, and passivation are carefully monitored to maintain stable product quality and surface condition.
With experienced production teams, reliable manufacturing resources, and flexible supply capabilities, we are able to support both standard and customized A4-70 Hex Bolt orders. Finished products are inspected before delivery, and quality documents such as material certificates, inspection reports, and test reports can be provided according to customer requirements to support long-term cooperation with industrial customers.