S-91084A117 ASTM A108 Inch-to-Metric Female Hex Thread Adapters

Key Features & Benefits at a Glance

• Seamless Inch-to-Metric Conversion - Enables reliable connection between 5/16"-18 and M4 threaded components, eliminating compatibility issues in mixed-standard applications
• Exceptional Durability - Made from black-oxide steel with Rockwell B85 hardness for superior wear resistance and long service life in demanding environments
• High-Strength Performance - 78,000 psi tensile strength ensures secure connections under heavy loads and vibration-prone conditions
• Precision Thread Fit - Class 2B (inch) and Class 6H (metric) thread tolerances provide consistent, reliable engagement without cross-threading risks
• Easy Installation & Removal - 1/2" external hex drive with 2 1/2" length offers excellent torque application and tool clearance for efficient maintenance
• Corrosion-Resistant Protection - Black-oxide surface treatment provides enhanced rust resistance while maintaining dimensional stability
• Regulatory Compliance - Meets ASTM A108 specifications and RoHS 3 requirements for safe use in regulated industries

Professional Applications & Engineering Value

This inch-to-metric female hex thread adapter solves critical compatibility challenges in industrial equipment maintenance and manufacturing. The black-oxide steel construction combined with Rockwell B85 hardness ensures reliable performance in high-vibration applications where thread integrity is paramount. With 78,000 psi tensile strength, this adapter maintains secure connections in heavy machinery, automotive assembly, and industrial automation systems. The precision Class 2B/6H thread fit guarantees smooth engagement between different thread standards, reducing installation time and preventing damage to expensive components. The external hex drive design allows for quick tool access in confined spaces, making it ideal for field service and production line applications where downtime must be minimized.

Specification Summary & Compliance

This adapter maintains precise Class 2B thread fit for the 5/16"-18 side and Class 6H thread fit for the M4 connection, ensuring dimensional accuracy across both measurement systems. Manufactured to ASTM A108 standards for consistent quality and performance. The product is RoHS 3 (2015/863/EU) compliant with exemption 6(a)-I for lead as an alloying element in steel, meeting international environmental regulations for industrial components.