S-91082A121 ASTM A108, ASTM B633 Inch-to-Metric Female Hex Thread Adapters

Key Features & Benefits at a Glance

• Seamless Thread Conversion – Enables reliable connection between 5/16"-18 inch and M5 metric threaded components, eliminating compatibility issues in mixed-standard assemblies.
• Exceptional Durability – Constructed from zinc-plated steel for superior corrosion resistance, extending service life in demanding industrial environments.
• High Mechanical Strength – With a 78,000 psi tensile strength and Rockwell B85 hardness, it withstands high loads and resists deformation under stress.
• Secure Installation – Features an external hex drive (1/2" size) and 2 1/2" length for easy, firm gripping with standard wrenches, preventing slippage.
• Precision Thread Fit – Manufactured to Class 2B (inch) and Class 6H (metric) thread standards, ensuring tight, vibration-resistant connections.
• Regulatory Compliance – Meets ASTM A108 and ASTM B633 specifications and is RoHS 3 compliant, assuring material quality and environmental safety.
• Versatile Adaptation – Ideal for converting thread sizes in machinery, automotive, and construction applications, reducing inventory needs for multiple adapters.

Professional Applications & Engineering Value

This female hex thread adapter addresses critical challenges in industries where inch-to-metric thread conversion is required for global equipment integration. Its zinc-plated steel construction provides a protective barrier against rust and wear, essential in humid or outdoor settings. The external hex drive design allows for high-torque installation using common tools, minimizing assembly time and enhancing joint integrity. Engineers value the precise Class 2B and 6H thread fits, which prevent cross-threading and ensure leak-proof seals in hydraulic systems, pneumatic controls, and structural frameworks. By complying with ASTM A108, it guarantees consistent performance in high-stress applications, from manufacturing plants to automotive repair, reducing downtime and maintenance costs.

Specification Summary & Compliance

The adapter maintains tight dimensional accuracy with Class 2B (inch) and Class 6H (metric) thread fits, adhering to standardized tolerances for reliable engagement. It is manufactured under ASTM A108 and ASTM B633 guidelines, ensuring material and plating quality. Regulatory compliance includes RoHS 3 (2015/863/EU) with exemption 6(a)-I for lead as an alloying element in steel, meeting environmental and safety requirements for industrial use.