S-91084A113 ASTM A108 Inch-to-Metric Female Hex Thread Adapters

Key Features & Benefits at a Glance

• Seamless Inch-to-Metric Conversion – Enables reliable connections between 1/4"-20 (inch) and M3 (metric) threaded components, eliminating compatibility issues in mixed-standard assemblies.
• Exceptional Durability & Corrosion Resistance – Black-oxide steel finish provides enhanced protection against rust and wear, extending service life in demanding industrial environments.
• High Tensile Strength for Heavy-Duty Use – With a tensile strength of 78,000 psi, this adapter withstands high mechanical loads without failure, ensuring secure, long-term performance.
• Precision Thread Fits for Leak-Free Connections – Class 2B (inch) and Class 6H (metric) thread fits guarantee tight, accurate mating, reducing the risk of loosening or fluid leakage.
• Easy Installation with External Hex Drive – The 1/2" external hex allows for quick, tool-friendly installation and removal, saving time during maintenance or assembly.
• Rigorous Compliance for Global Standards – Meets ASTM A108 material specifications and is RoHS 3 compliant, ensuring safety and regulatory adherence for international industrial applications.
• Optimized Thread Engagement – Generous thread lengths (5/8" and 6.4 mm) provide ample engagement depth, enhancing connection stability and vibration resistance.

Professional Applications & Engineering Value

This female hex thread adapter is engineered to solve critical challenges in machinery, automotive, and equipment manufacturing where inch and metric systems intersect. The black-oxide steel construction, combined with Rockwell B85 hardness, offers superior resistance to corrosion and mechanical stress, preventing thread galling and seizing in high-vibration environments. Its Class 2B and 6H thread fits ensure precise alignment, minimizing the risk of cross-threading and fluid leaks in hydraulic or pneumatic systems. By enabling seamless thread size adaptation, it reduces inventory needs for custom fittings and streamlines assembly processes, making it an essential component for engineers requiring reliable, heavy-duty performance in global projects.

Specification Summary & Compliance

This adapter features precise Class 2B (inch) and Class 6H (metric) thread fits, ensuring dimensional accuracy per industry standards. It is manufactured from ASTM A108 compliant steel, with a tensile strength of 78,000 psi and hardness of Rockwell B85. The product is RoHS 3 (2015/863/EU) compliant under exemption 6(a)-I, adhering to environmental regulations for lead as an alloying element in steel. This guarantees suitability for industrial applications requiring strict material and safety standards.