Testing frequency is usually defined by the project engineer or the "Lot" size. A typical sampling rate might be two samples per lot, where a lot is defined as fasteners of the same diameter, length, and heat number.
October 26, 2023 Subject: Detailed Analysis of ASTM A307 Standard Specification for Carbon Steel Bolts, Studs, and Threaded Rod Applicable Standard: ASTM A307 / A307M (Latest Revision) astm a307 anchor bolts specifications
| Property | Grade A (General) | Grade B (Structural) | | :--- | :--- | :--- | | | 60,000 psi (Min) | 60,000 psi (Min) | | | 100,000 psi (Max) | 90,000 psi (Max) | | Yield Strength | Not Explicitly Defined | 36,000 psi (Min) | | Elongation | 18% (in 2 in.) | 23% (in 2 in.) | | Reduction of Area | 35% (Min) | 30% (Min) | | Hardness | 69 - 100 HRB | 69 - 95 HRB | Testing frequency is usually defined by the project
ASTM A307 is the standard specification for carbon steel bolts, studs, and threaded rods, commonly used for anchor bolts in non-critical, low-stress applications (e.g., structural bolting, flanged joints, and anchoring equipment to concrete). elements like Chromium
The specification categorizes fasteners based on their tensile strength and design purpose:
Note: Since A307 is a low-carbon steel specification, elements like Chromium, Nickel, and Molybdenum are generally not intentionally added. The low carbon content ensures the material is ductile and can be bent (for hooks) without fracturing.