S-91082A124 ASTM A108, ASTM B633 Inch-to-Metric Female Hex Thread Adapters

Key Features & Benefits at a Glance

• Seamless Inch-to-Metric Conversion – Enables reliable connections between 2-56 (inch) and M3.5 (metric) threaded components, eliminating compatibility issues in mixed-standard assemblies.
• Exceptional Tensile Strength – Withstands up to 78,000 psi, providing robust performance under high-stress conditions and reducing the risk of mechanical failure.
• Superior Hardness & Durability – Rockwell B85 hardness ensures resistance to wear and deformation, extending service life in demanding industrial environments.
• Precision Thread Fits – Class 2B (inch) and Class 6H (metric) thread fits guarantee accurate, secure mating with minimal backlash for vibration-resistant assemblies.
• Corrosion-Resistant Finish – Zinc-plated steel construction offers enhanced protection against rust and environmental degradation, ideal for both indoor and outdoor applications.
• Easy Installation & Removal – External 1/4" hex drive allows for quick, tool-friendly installation, speeding up assembly and maintenance workflows.
• Compliant with Industry Standards – Meets ASTM A108 and ASTM B633 specifications, ensuring consistent quality and material integrity for engineering and manufacturing use.

Professional Applications & Engineering Value

This female hex thread adapter is engineered to solve critical challenges in multi-standard assembly lines, where mismatched thread sizes can cause delays and compromise structural integrity. Made from zinc-plated steel, it provides reliable corrosion resistance and mechanical strength, essential for automotive, aerospace, and heavy machinery sectors. The precise Class 2B and 6H thread fits ensure tight, secure connections that resist loosening under vibration, while the external hex drive simplifies installation in confined spaces. By enabling seamless transitions between inch and metric systems, this adapter reduces inventory complexity and enhances operational efficiency in global supply chains.

Specification Summary & Compliance

This adapter features inch (2-56, Class 2B) and metric (M3.5 x 0.6 mm, Class 6H) threads with a 1/4" hex drive and 1 1/2" hex length. It complies with ASTM A108 and ASTM B633 manufacturing standards, and is RoHS 3 (2015/863/EU) compliant under exemption 6(a)-I for lead as an alloying element in steel, ensuring environmental and safety adherence.