S-91082A119 ASTM A108, ASTM B633 Inch-to-Metric Female Hex Thread Adapters

Key Features & Benefits at a Glance

• Dual-system compatibility enables seamless conversion between 5/16"-18 inch and M3.5 metric threads, eliminating the need for multiple adapters and reducing inventory costs
• Zinc-plated steel construction provides superior corrosion resistance for extended service life in demanding industrial environments
• 78,000 psi tensile strength with Rockwell B85 hardness ensures reliable performance under high-stress applications without deformation
• Precision Class 2B/6H thread fit guarantees secure connections with minimal backlash for vibration-resistant assemblies
• 1/2" external hex drive with 2-1/2" length offers excellent torque transmission and tool accessibility in confined spaces
• ASTM A108 and ASTM B633 compliance verifies material quality and manufacturing consistency for engineering-critical applications
• RoHS 3 compliance meets international environmental standards while maintaining performance with approved lead exemptions

Professional Applications & Engineering Value

This female hex thread adapter solves critical compatibility challenges in multinational equipment maintenance and manufacturing operations. The zinc-plated steel construction provides essential corrosion protection for automotive assembly lines, industrial machinery, and outdoor equipment applications where environmental exposure compromises fastener integrity. With precision Class 2B/6H thread fits, this adapter maintains dimensional stability in high-vibration environments, preventing loosening in power transmission systems and precision instrumentation. The external hex drive design ensures compatibility with standard industrial tools, while the inch-to-metric conversion capability streamlines global supply chain management by eliminating the need for duplicate tooling inventories across measurement systems.

Specification Summary & Compliance

This adapter maintains Class 2B thread fit for the 5/16"-18 inch thread and Class 6H thread fit for the M3.5 metric thread, ensuring precise dimensional tolerances per ISO standards. Manufacturing complies with ASTM A108 for steel bar materials and ASTM B633 for zinc plating specifications. 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 while maintaining mechanical performance requirements.