S-91084A136 ASTM A108 Inch-to-Metric Female Hex Thread Adapters

Key Features & Benefits at a Glance

• Seamless Inch-to-Metric Conversion – Enables reliable connection between 1/4"-20 and M8 threaded components, eliminating compatibility issues in mixed-standard assemblies.
• Exceptional Durability – Constructed from Black-Oxide Steel with Rockwell B85 hardness, offering superior resistance to wear, corrosion, and mechanical stress in harsh industrial environments.
• High Tensile Strength – Withstands up to 78,000 psi tensile strength, ensuring secure, vibration-resistant connections under heavy loads.
• Precision Thread Fit – Features Class 2B (inch) and Class 6H (metric) thread fits for accurate alignment, reduced cross-threading risk, and consistent performance.
• Easy Installation & Removal – External hex drive (1/2" size) allows for quick, tool-friendly tightening and loosening, saving time during maintenance or assembly.
• Compliant & Safe – Meets ASTM A108 specifications and is RoHS 3 compliant, ensuring material safety and regulatory adherence for global supply chains.
• Versatile Hex Shape – Standard hex design provides multiple wrench engagement points, facilitating access in confined spaces and improving torque application.

Professional Applications & Engineering Value

This female hex thread adapter is engineered to solve critical challenges in industrial and mechanical systems where inch-to-metric thread conversion is required. The Black-Oxide Steel construction, combined with a Rockwell B85 hardness rating, provides excellent resistance to corrosion and abrasion, extending service life in demanding applications such as heavy machinery, automotive assembly, and construction equipment. The precise Class 2B and 6H thread fits ensure leak-proof and secure connections, reducing downtime caused by thread failure or misalignment. Its external hex drive design allows for efficient installation with standard tools, making it ideal for maintenance teams and OEMs needing reliable, high-strength adapters that comply with ASTM A108 standards and RoHS 3 environmental directives.

Specification Summary & Compliance

This adapter maintains high dimensional accuracy with Class 2B (inch) and Class 6H (metric) thread fits, ensuring precise engagement and interchangeability. It adheres to ASTM A108 manufacturing standards for material consistency and performance. The product is RoHS 3 (2015/863/EU) compliant under exemption 6(a)-I, confirming its suitability for regulated industries without compromising on lead-alloyed steel durability.