S-91084A118 ASTM A108 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 M5 threaded components, eliminating compatibility issues in mixed-standard assemblies.
• Exceptional Tensile Strength: Withstands up to 78,000 psi loads, ensuring secure, vibration-resistant joints in high-stress industrial applications.
• Enhanced Durability & Corrosion Resistance: Black-oxide steel construction with Rockwell B85 hardness provides long-lasting performance in demanding environments.
• Precision Thread Fit: Class 2B (inch) and Class 6H (metric) thread tolerances guarantee consistent, leak-free connections without cross-threading risks.
• Easy Installation & Removal: External 1/2" hex drive with 2 1/2" length offers superior torque application using standard wrenches.
• Regulatory Compliance: Meets ASTM A108 material standards and RoHS 3 requirements, ensuring safe use in regulated industries.
• Versatile Industrial Application: Ideal for machinery, automotive, and equipment manufacturing where reliable thread adaptation is critical.

Professional Applications & Engineering Value

This female hex thread adapter solves critical challenges in industrial equipment maintenance and manufacturing where inch and metric thread systems must coexist. The black-oxide steel construction provides superior corrosion resistance compared to plain carbon steel, while the Rockwell B85 hardness maintains thread integrity through repeated assembly cycles. Engineers benefit from the Class 2B/6H thread fits that prevent fluid leakage and structural weaknesses in hydraulic systems, pneumatic controls, and precision machinery. The external hex drive design enables quick installation in confined spaces, reducing assembly time and tooling requirements. This adapter serves as a reliable thread conversion solution for automotive repair, industrial machinery, and international equipment deployments where standardized components are unavailable.

Specification Summary & Compliance

This adapter maintains Class 2B (inch) and Class 6H (metric) thread tolerances for precision fit, manufactured from ASTM A108 steel with black-oxide surface treatment. The product is RoHS 3 (2015/863/EU) compliant under exemption 6(a)-I for lead as steel alloying element. Mechanical properties include 78,000 psi tensile strength and Rockwell B85 hardness, ensuring compliance with industrial fastener standards for reliable performance in engineering applications.