S-91084A126 ASTM A108 Inch-to-Metric Female Hex Thread Adapters
Inch-to-Metric Female Hex Thread Adapters
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Basic Information
Material & Strength Parameters
End A Thread Parameters
End B Thread Parameters
Hex Parameters
Drive Parameters
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Key Features & Benefits at a Glance
- Seamless Inch-to-Metric Conversion – Enables reliable connection between 4-40 and M5 threaded components, eliminating compatibility issues in mixed-standard assemblies.
- Exceptional Tensile Strength – Withstands up to 78,000 psi, providing dependable load-bearing capacity in demanding mechanical applications.
- Corrosion-Resistant Black-Oxide Finish – Extends service life by protecting against rust and wear in industrial environments.
- Precision Thread Fit – Class 2B (inch) and Class 6H (metric) threads ensure smooth engagement and vibration resistance.
- Durable External Hex Drive – 3/8" hex allows for secure tool grip and easy installation with standard wrenches.
- Hardened Steel Construction – Rockwell B85 hardness offers excellent resistance to deformation under torque and repeated use.
- Regulatory Compliance – Meets ASTM A108 standards and RoHS 3 requirements, ensuring material consistency and environmental safety.
Professional Applications & Engineering Value
This female hex thread adapter solves critical challenges in machinery, automation, and equipment maintenance where inch and metric thread systems must interface reliably. The black-oxide steel construction provides a protective layer that reduces galling and seizing, especially in high-cycle applications. With a 3/8" hex drive and precise Class 2B/6H thread fit, it ensures quick, tool-friendly installation and maintains alignment under dynamic loads. Engineers value its ability to bridge 4-40 to M5 connections without compromising strength—ideal for CNC fixtures, motor mounts, and precision assembly lines where thread accuracy and 78,000 psi tensile strength prevent joint failure and reduce downtime.
Specification Summary & Compliance
The adapter maintains Class 2B (inch) and Class 6H (metric) thread tolerances for consistent fit. It is manufactured to ASTM A108 specifications, ensuring material and dimensional integrity. The product is RoHS 3 (2015/863/EU) compliant under exemption 6(a)-I for lead as an alloying element in steel, meeting environmental and safety standards for industrial use.
