Technical specifications and application range of ASTM A449 fasteners
The ASTM A449 specification regulates the production of quenched and tempered steel fasteners—hex cap screws, bolts, and studs intended for load-bearing connections in mechanical engineering and structural construction. The mechanical properties of the products directly depend on their geometric parameters:
- For diameters up to 1.0 inch inclusive: the minimum tensile strength is 120 ksi.
- For diameters over 1.0 to 1.5 inches inclusive: 105 ksi.
- For diameters from 1.75 to 3.0 inches inclusive: 90 ksi.
EV Group China supplies fasteners that meet these requirements, ensuring high reliability for general engineering applications. The product range includes sizes from 1/4 to 3.0 inches.
Steel classification according to ASTM A449
| Type | Material Description |
|---|---|
| Type I | Medium carbon, boron-added medium carbon, alloy, or boron-added alloy steel. |
| Type 2 | Withdrawn from the current standard revision in 2003. |
| Type 3 | Weathering steel with enhanced corrosion resistance. |
The terminology used in quality assessment and product testing is based on the F1789 standard. The inch-pound system is adopted as the base unit of measurement. EV Group China specialists follow current safety requirements and industrial quality standards when supplying fasteners, ensuring that each batch complies with the ordered technical parameters.