S-91084A116 ASTM A108 Inch-to-Metric Female Hex Thread Adapters

Key Features & Benefits at a Glance

• Seamless Inch-to-Metric Conversion – Enables reliable connection between 1/4"-20 (inch) and M5 (metric) threaded components, eliminating compatibility issues in mixed-standard assemblies.
• Exceptional Durability Under Load – Black-oxide steel construction with Rockwell B85 hardness and 78,000 psi tensile strength resists wear, deformation, and thread stripping in demanding environments.
• Precision Thread Fit for Secure Fastening – Class 2B (inch) and Class 6H (metric) thread tolerances ensure consistent engagement, reducing the risk of cross-threading or loosening under vibration.
• Easy Installation and Removal – External 1/2" hex drive with 2 1/2" length provides ample tool clearance and torque application, speeding up maintenance and assembly workflows.
• Corrosion-Resistant Surface Protection – Black-oxide finish offers a durable, anti-galling layer that extends service life in industrial settings without compromising dimensional integrity.
• Compliance with Industry Standards – Manufactured to ASTM A108 specifications and RoHS 3 compliant, meeting regulatory and quality requirements for global supply chains.
• Versatile Gender Design – Dual female threads accommodate a wide range of male-fastened components, simplifying inventory and reducing adapter stack-up.

Professional Applications & Engineering Value

This female hex thread adapter bridges critical gaps in machinery, automotive, and heavy equipment where inch and metric thread systems coexist. Engineered from black-oxide steel, it addresses common pain points like thread seizure and strength mismatch by combining a corrosion-resistant surface with high tensile capacity (78,000 psi). The external hex drive and precise Class 2B/6H thread fit allow for secure, tool-accessible installations in confined spaces, reducing assembly errors and downtime. Ideal for adapting hydraulic fittings, motor mounts, or structural frames, this adapter ensures reliable thread adaptation without sacrificing mechanical integrity under cyclic loads or harsh operating conditions.

Specification Summary & Compliance

Thread sizes: 1/4"-20 (inch, Class 2B fit) to M5x0.8 mm (metric, Class 6H fit). Hex drive: 1/2" size, 2 1/2" length. Manufactured per ASTM A108 standards with material hardness of Rockwell B85. Fully RoHS 3 (2015/863/EU) compliant under exemption 6(a)-I for lead as a steel alloying element. Dimensional accuracy and thread geometry adhere to industry-accepted inch/metric tolerances for consistent performance.