Astm A307 Specification Link Jun 2026
In the vast ecosystem of construction and industrial manufacturing, the humble bolt often goes unnoticed. Yet, the safety of a building, a bridge, or a pressure vessel depends entirely on the predictable performance of these small fasteners. To ensure this predictability, engineers rely on material standards. Among the most ubiquitous and enduring of these is , the standard specification for carbon steel bolts, studs, and threaded rods of low tensile strength. While lacking the glamour of high-strength alloys, ASTM A307 serves as the indispensable workhorse of general-purpose fastening, providing a balance of ductility, economy, and reliability for a specific class of non-critical applications.
The specification is divided into three primary grades, each defined by its intended use and mechanical requirements: General-purpose construction. Strength: Minimum tensile strength of 60,000 psi (60 ksi) .
The defining characteristic of ASTM A307 is its tensile strength. astm a307 specification
Generally limited to heavy hex bolts or fully threaded studs to ensure proper seating in flanges. Grade C (Withdrawn) Grade C Eliminated From ASTM A307 - Portland Bolt
: Originally used for unheaded anchor bolts (bent or straight) for structural anchorage. This grade was officially withdrawn in 2007 and replaced by the ASTM F1554 Grade 36 specification . Mechanical & Chemical Requirements In the vast ecosystem of construction and industrial
However, these same attributes constitute the specification's limitations. ASTM A307 bolts cannot sustain high clamping forces. If torqued to structural bolt preload levels, they will yield or fracture. They are also unsuitable for dynamic or fatigue-prone environments, where the lack of controlled hardness can lead to premature thread stripping or stress corrosion cracking. Therefore, the specification explicitly states that these bolts are not for use in critical structural joints requiring high strength or controlled tension.
No configuration limits; can be headed bolts, bent bolts, or threaded rods. Among the most ubiquitous and enduring of these
ASTM A307 is the standard specification covering carbon steel bolts, studs, and threaded rods with a minimum tensile strength of 60,000 psi (414 MPa). These fasteners are intended for general-purpose applications and are commonly used in structural, mechanical, and flanged joint connections. They are not intended for high-temperature or high-pressure service.
The steel used for ASTM A307 fasteners must conform to specific chemical composition limits. While specific heat analysis varies by manufacturer and size, the limits are generally set to ensure weldability and ductility. Unlike quenched and tempered bolts (like A325 or A490), A307 bolts are generally lower carbon.