S-91082A123 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 5/16"-18 and M8 threaded components, eliminating compatibility issues in mixed-standard assemblies.
• Exceptional Tensile Strength – Withstands up to 78,000 psi, ensuring durability under high-stress conditions in demanding industrial environments.
• Corrosion-Resistant Zinc-Plated Steel – Provides enhanced protection against rust and wear, extending service life in harsh operating conditions.
• Precision Thread Fits – Class 2B (inch) and Class 6H (metric) threads guarantee secure, vibration-resistant connections without cross-threading risks.
• Convenient External Hex Drive – 1/2" hex design allows for easy installation and removal using standard wrenches, reducing assembly time.
• Rigorous Compliance Standards – Meets ASTM A108 and ASTM B633 specifications, ensuring consistent quality and performance in regulated applications.
• RoHS 3 Environmental Compliance – Adheres to EU directive 2015/863/EU with exemption, supporting sustainable and safe manufacturing practices.

Professional Applications & Engineering Value

This female hex thread adapter solves critical challenges in industries where inch and metric systems intersect, such as machinery manufacturing, automotive, and heavy equipment. Crafted from zinc-plated steel with a Rockwell B85 hardness, it resists deformation and corrosion, maintaining integrity in volatile environments. The external hex drive and precise Class 2B and 6H threads facilitate quick, tool-friendly installations, reducing downtime and preventing thread damage. Ideal for adapting hydraulic fittings, structural frames, or pneumatic systems, this adapter ensures leak-proof, high-strength connections that meet ASTM standards, delivering reliability where precision and durability are non-negotiable.

Specification Summary & Compliance

This adapter features inch (5/16"-18, Class 2B) and metric (M8x1.25, Class 6H) threads with a 1/2" hex drive and 2 1/2" hex length. It complies with ASTM A108 and ASTM B633 manufacturing standards, ensuring dimensional accuracy and material consistency. The product is RoHS 3 (2015/863/EU) compliant with exemption 6(a)-I for lead as an alloying element in steel, supporting environmental and safety regulations in global supply chains.