ASTM fasteners are engineered for high-performance applications where strength, temperature resistance and material traceability are critical.
We supply ASTM-compliant bolts, nuts and stud bolts including A193 B7, A194 and structural grades, supporting industries such as oil & gas, energy and heavy engineering. Our approach combines technical evaluation, controlled sourcing and consistent supply across Europe.
ASTM fasteners are mechanical components manufactured according to standards defined by ASTM International, covering material composition, mechanical properties, heat treatment and testing requirements.
These standards are widely used in industries where performance, safety and traceability are critical, such as oil & gas, power generation and structural applications.
Unlike ISO or DIN standards, ASTM specifications are often based on material grades and performance requirements rather than strength classes, making them particularly suitable for high-stress and high-temperature environments.
ASTM standards define:
ASTM A193 covers high-strength alloy and stainless steel fasteners designed for high temperature and high-pressure service. The most common grade is B7, widely used in oil & gas, petrochemical and energy applications.
ASTM A194 specifies carbon and alloy steel nuts intended for use with ASTM A193 bolts in high-pressure and high-temperature environments.
These standards define high-strength structural bolts used in steel constructions and infrastructure projects. They are designed for load-bearing applications requiring controlled tightening and performance.
ASTM F3125 consolidates several structural bolt standards, including A325 and A490, into a unified specification for structural bolting assemblies.
ASTM fasteners are classified by material grades that define their mechanical properties, heat treatment and application range.
Each grade is designed for specific operating conditions, including high pressure, elevated or low temperatures and corrosive environments. Correct selection requires evaluation of material performance, compatibility and service conditions.
To simplify selection and comparison, we provide a complete technical overview of ASTM, SAE and ISO fastener grades, including mechanical properties, material specifications and marking systems.
The table allows quick identification of the correct grade based on strength, material and application.
Includes: mechanical properties, grade markings, material specifications, typical applications
ASTM standards define fastener grades based on mechanical properties, material composition and intended application. Unlike ISO classes, ASTM grades are often linked to specific industries such as structural steel, pressure vessels and high-temperature applications.
| ASTM Grade | ISO Equivalent | Key Difference |
|---|---|---|
| A307 | 4.6 / 5.6 | Lower strength, less controlled mechanical properties |
| A325 | 8.8 | Designed for structural steel connections with defined performance |
| A490 | 10.9+ | Higher strength, not suitable for galvanizing due to hydrogen embrittlement risk |
| A193 B7 | — | Alloy steel for high temperature and pressure applications (no direct ISO equivalent) |
ASTM fasteners are typically selected when application requirements go beyond standard metric fastening. They are commonly used in structural, high-load and high-temperature environments where defined performance standards are required.
Assuming ASTM and ISO are interchangeable
Selecting based only on strength class
Ignoring coating limitations (e.g. A490 and galvanizing)
Not considering operating temperature
