S-91082A130 ASTM A108, ASTM B633 Inch-to-Metric Female Hex Thread Adapters

Key Features & Benefits at a Glance

• Seamless Inch-to-Metric Conversion – Enables reliable connections between 4-40 (inch) and M5 (metric) threaded components, eliminating compatibility issues in mixed-standard assemblies.
• High Tensile Strength & Durability – With a tensile strength of 78,000 psi, this adapter withstands heavy loads and repetitive stress, reducing the risk of failure in demanding applications.
• Corrosion-Resistant Zinc-Plated Steel – The zinc plating provides excellent rust protection, extending service life in humid or outdoor industrial environments.
• Precision Thread Fit – Class 2B (inch) and Class 6H (metric) thread fits ensure tight, secure connections with minimal backlash, enhancing assembly accuracy.
• Easy Installation with External Hex Drive – The 3/8" external hex allows for quick and firm tool engagement, speeding up installation and maintenance tasks.
• Industry-Compliant Material & Manufacturing – Made from steel meeting ASTM A108 and ASTM B633 standards, guaranteeing consistent quality and mechanical properties.
• Environmentally Safe & RoHS 3 Compliant – Complies with RoHS 3 (2015/863/EU), making it suitable for use in regulated industries without hazardous substance concerns.

Professional Applications & Engineering Value

This female hex thread adapter is engineered to solve critical challenges in machinery, automotive, and electrical systems where inch and metric thread standards intersect. Its zinc-plated steel construction and Rockwell B85 hardness provide resistance to wear and environmental factors, preventing thread stripping and corrosion in high-vibration settings. The precise Class 2B and 6H thread fits ensure leak-proof and stable connections, reducing assembly errors and downtime. Ideal for adapting equipment like sensors, fasteners, and hydraulic components, this adapter supports efficient industrial thread conversion while maintaining high-strength performance under loads up to 78,000 psi.

Specification Summary & Compliance

This adapter features inch (4-40) and metric (M5 x 0.8 mm) threads with precision Class 2B (inch) and Class 6H (metric) thread fits, ensuring dimensional accuracy. It complies with ASTM A108 and ASTM B633 specifications for material and plating quality, and is RoHS 3 (2015/863/EU) compliant under exemption 6(a)-I for lead as an alloying element in steel. The external hex drive (3/8" size) and zinc-plated finish further support reliable use in regulated industrial applications.