S-91082A128 ASTM A108, ASTM B633 Inch-to-Metric Female Hex Thread Adapters

Key Features & Benefits at a Glance

• Seamless Inch-to-Metric Conversion: Effortlessly connect 4-40 (inch) and M4 (metric) components, eliminating compatibility issues and reducing assembly time.
• Exceptional Durability & Corrosion Resistance: Constructed from zinc-plated steel, this adapter offers superior protection against rust and wear in demanding industrial environments.
li>High Mechanical Strength for Demanding Applications: With a 78,000 psi tensile strength and Rockwell B85 hardness, it ensures reliable, vibration-resistant connections under high stress.
• Precision Thread Fit for Leak-Proof Sealing: Class 2B (inch) and Class 6H (metric) thread fits guarantee tight, secure engagements that prevent loosening and fluid/gas leakage.
• Optimized for Easy Installation & Removal: The external hex (1/4") design provides a firm grip for standard wrenches, facilitating quick and secure fastening.
• Compliance with Rigorous Industry Standards: Manufactured to meet ASTM A108 and ASTM B633 specifications, ensuring consistent quality and material integrity.
• Environmentally Conscious Manufacturing: RoHS 3 compliant, making it a responsible choice for global supply chains and regulated industries.

Professional Applications & Engineering Value

This Inch-to-Metric Female Hex Thread Adapter is engineered to solve critical challenges in multi-standard assembly lines and equipment manufacturing. Its zinc-plated steel construction provides excellent corrosion resistance, which is vital for machinery exposed to moisture, chemicals, or outdoor conditions, thereby extending service life and reducing maintenance. The precise Class 2B/6H thread fit ensures a secure, leak-proof connection, essential in pneumatic systems, hydraulic fittings, and precision instruments where thread integrity cannot be compromised. By enabling a reliable interface between 4-40 and M4 threaded components, it eliminates the need for custom parts, streamlines inventory, and accelerates production timelines in industries like automotive, aerospace, and industrial automation. The robust external hex drive allows for high-torque installation, making it a dependable solution for high-vibration applications.

Specification Summary & Compliance

This adapter guarantees dimensional accuracy with Class 2B (inch) and Class 6H (metric) thread fits, adhering to standardized tolerances for reliable performance. It is manufactured in compliance with ASTM A108 and ASTM B633 material and 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 and safety regulations.