S-91082A108 ASTM A108, ASTM B633 Inch-to-Metric Female Hex Thread Adapters

Key Features & Benefits at a Glance

• Seamless Inch-to-Metric Conversion – Enables reliable connection between 8-32 (inch) and M3 (metric) threaded components, eliminating compatibility issues in mixed-standard assemblies.
• Exceptional Tensile Strength – Withstands up to 78,000 psi, providing dependable load-bearing capacity in high-stress industrial environments.
• Corrosion-Resistant Zinc-Plated Steel – Offers enhanced durability and rust protection, extending service life in demanding conditions.
• Precision Thread Fit – Class 2B (inch) and Class 6H (metric) thread tolerances ensure secure, vibration-resistant connections with minimal risk of cross-threading.
• Convenient External Hex Drive – 1/4" hex size and 1-1/2" length allow for easy installation and removal using standard tools, reducing assembly time.
• High Hardness Rating – Rockwell B85 hardness provides excellent resistance to wear and deformation under repeated use.
• Industry Compliance & Safety – Meets ASTM A108 material standards and RoHS 3 regulations, ensuring material quality and environmental responsibility.

Professional Applications & Engineering Value

This female hex thread adapter bridges critical gaps in machinery, automotive, and equipment manufacturing where inch and metric thread systems coexist. Its zinc-plated steel construction combats corrosion in humid or outdoor settings, while the Class 2B and 6H thread fits maintain alignment under vibration, preventing loosening in dynamic applications. The external hex drive and generous thread length facilitate quick tool access and deep engagement, ideal for retrofit projects or maintenance tasks requiring fast, reliable thread conversion. By adhering to ASTM A108 specifications, it delivers consistent performance in assembly lines, reducing downtime and component mismatch risks.

Specification Summary & Compliance

This adapter features precise Class 2B (inch) and Class 6H (metric) thread fits with thread lengths of 0.437" (8-32) and 6.4 mm (M3). Manufactured in compliance with ASTM A108 and ASTM B633 standards, it ensures material integrity and dimensional accuracy. The product is RoHS 3 (2015/863/EU) compliant under exemption 6(a)-I for lead as an alloying element in steel, supporting safe and regulated use in global markets.