S-91072A388 ASTM A108, ASTM B633 Inch-to-Inch Female Hex Thread Adapters

Key Features & Benefits at a Glance

• Seamless Thread Conversion: Enables reliable connection between 4-40 and 1/4"-20 threaded components, eliminating compatibility issues in inch-based systems
• Superior Corrosion Resistance: Zinc-plated steel construction provides durable protection against rust and environmental degradation in industrial settings
• High-Strength Performance: 75,000 psi tensile strength and Rockwell B65 hardness ensure reliable operation under heavy loads and repeated use
• Precision Thread Engagement: Class 2B thread fit on both ends guarantees secure, vibration-resistant connections with minimal backlash
• Optimal Torque Transmission: 1/2" external hex drive with 2 1/2" length provides excellent leverage for installation and removal in confined spaces
• Industry Compliance Assurance: Meets ASTM A108 and ASTM B633 specifications for material quality and manufacturing consistency
• Environmental Responsibility: RoHS 3 compliant construction supports sustainable manufacturing practices and regulatory requirements

Professional Applications & Engineering Value

This female hex thread adapter solves critical connection challenges in industrial assembly and maintenance operations where different thread specifications must interface reliably. The zinc-plated steel construction provides essential corrosion protection for equipment exposed to moisture, chemicals, or outdoor conditions, while the Rockwell B65 hardness ensures the adapter maintains dimensional stability under repeated torque applications. The precision Class 2B thread fit on both the 4-40 and 1/4"-20 ends prevents cross-threading and ensures vibration-resistant connections in machinery, automotive systems, and electrical enclosures. The generous 2 1/2" hex length allows mechanics to apply sufficient torque without damaging the adapter, making it ideal for maintenance scenarios where space constraints limit tool access. This inch-to-inch adapter delivers engineering value by extending equipment life through reliable thread conversion while meeting stringent industrial standards.

Specification Summary & Compliance

This precision adapter features Class 2B thread fit on both 4-40 and 1/4"-20 connections, ensuring proper engagement with standard mating components. Manufactured in compliance with ASTM A108 for steel bar quality and ASTM B633 for zinc plating specifications, the adapter maintains consistent dimensional accuracy and surface finish. The product is RoHS 3 (2015/863/EU) compliant with exemption 6(a)-I for lead as an alloying element in steel, meeting environmental regulations for industrial components. With inch-system threading throughout and external hex drive configuration, this adapter provides reliable performance in applications requiring precise thread adaptation between different size specifications.