Astm 307 [better] Jun 2026

Unlike higher-strength bolts (e.g., ASTM A325 or A490), A307 bolts are not intended for structural connections subject to heavy dynamic or fatigue loading. Instead, they are ideal for light-duty fastening, flanged joints, cast iron connections, and general maintenance.

| Standard | Tensile Strength | Typical Application | |----------|----------------|----------------------| | | 60 ksi min | General utility, flanges | | ASTM F1554 Gr. 36 | 58–80 ksi | Anchor bolts (better for seismic) | | SAE J429 Gr. 2 | 60 ksi min | Automotive/machinery bolts (similar but not interchangeable for spec compliance) | | ASTM A449 | 90–120 ksi | Higher strength general use | | ISO 898-1 Class 4.6 | 58–71 ksi | Metric equivalent to A307 Gr. A | astm 307

| Grade | Description | Typical Use | |-------|-------------|--------------| | | Low carbon steel (no heat treat required). Soft, ductile, and easily bendable. | General purpose fasteners, pipe flanges, electrical conduits, anchor bolts. | | Grade B | Low carbon steel (may be heat treated). Slightly higher strength and hardness. | Flanged joints in piping systems (especially cast iron flanges), mild machinery assembly. | | Grade C | (Rarely used/obsolete) | Replaced by F1554 for anchor bolts. | Unlike higher-strength bolts (e

The specification is divided into three primary grades, each suited for different functional roles: 36 | 58–80 ksi | Anchor bolts (better

The ASTM A307 standard offers several advantages and benefits, including: