S-91072A401 ASTM A108 Inch-to-Inch Female Hex Thread Adapters

Key Features & Benefits at a Glance

• Seamless Thread Conversion: Enables reliable connection between 4-40 and 10-32 threaded components, eliminating compatibility issues in inch-based assemblies.
• Superior Corrosion Resistance: Black-oxide steel construction provides enhanced protection against rust and wear in demanding industrial environments.
• Exceptional Mechanical Strength: With 75,000 psi tensile strength and Rockwell B65 hardness, withstands high-stress applications without deformation.
• Precision Thread Engagement: Class 2B thread fit ensures consistent, vibration-resistant connections that maintain integrity under load.
• Optimized Tool Access: External hex drive with 3/8" size and 2" length offers secure wrench grip for easy installation in confined spaces.
• Rigorous Quality Assurance: Manufactured to ASTM A108 standards, guaranteeing dimensional accuracy and material consistency.
• Environmental Compliance: RoHS 3 compliant for safe use in regulated industries and international markets.

Professional Applications & Engineering Value

This female hex thread adapter solves critical challenges in precision assembly where different thread sizes must interface reliably. The black-oxide steel construction provides essential corrosion protection for applications in automotive, aerospace, and industrial machinery exposed to harsh conditions. With dual female threads (4-40 to 10-32), engineers can streamline inventory by reducing the need for multiple adapters while maintaining Class 2B thread fit precision. The external hex drive design ensures secure tool engagement during torque application, preventing slippage that could damage components. This inch-to-inch adapter delivers consistent performance in vibration-prone environments thanks to its 75,000 psi tensile strength, making it ideal for permanent installations where disassembly is infrequent.

Specification Summary & Compliance

This adapter features Class 2B thread fit on both 4-40 (1/4" length) and 10-32 (1/2" length) interfaces, maintaining standard inch system tolerances for reliable engagement. Manufacturing follows ASTM A108 specifications for material quality and dimensional consistency. 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 standards for industrial components.