S-91084A124 ASTM A108 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) threaded components, eliminating compatibility issues and reducing assembly time.
• Exceptional Durability & Strength: Constructed from Black-Oxide Steel with a high 78,000 psi tensile strength and Rockwell B85 hardness to withstand high-stress applications and prevent thread stripping.
• Superior Corrosion Resistance: The black-oxide surface treatment provides a protective layer, enhancing longevity in demanding industrial environments and resisting rust.
• Precision Thread Fit for Leak-Free Connections: Features Class 2B (inch) and Class 6H (metric) thread fits, ensuring tight, secure, and reliable connections that minimize the risk of loosening under vibration.
• Easy Installation & Removal: The 1/4" external hex drive and 1 1/2" hex length offer excellent tool grip and torque application, facilitating quick maintenance and adjustments.
• Compliance with Industry Standards: Manufactured to meet ASTM A108 specifications, guaranteeing consistent quality, dimensional accuracy, and material integrity.
• Environmentally Compliant for Global Use: RoHS 3 (2015/863/EU) compliant with exemption 6(a)-I, making it suitable for international 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 servicing. Its Black-Oxide Steel construction and robust 78,000 psi tensile strength provide the mechanical integrity needed for high-vibration environments, such as in automotive, aerospace, and heavy machinery, where failure is not an option. The precise Class 2B/6H thread fit ensures leak-proof and secure connections between 4-40 and M4 components, reducing the need for custom parts and minimizing downtime. The external hex drive design allows for straightforward installation with standard tools, enhancing workflow efficiency in maintenance and production settings. By offering a reliable, corrosion-resistant solution, this adapter extends the service life of connected assemblies and supports seamless integration in global engineering projects.

Specification Summary & Compliance

This adapter ensures dimensional precision with Class 2B (inch) and Class 6H (metric) thread fits, adhering to standardized tolerances for reliable performance. It is manufactured in compliance with the ASTM A108 specification for material quality and consistency. 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 safe use in various industries.