S-91082A140 ASTM A108, ASTM B633 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 and M8 threaded components, eliminating compatibility issues in mixed-standard environments
• Exceptional Durability – Zinc-plated steel construction with Rockwell B85 hardness provides superior corrosion resistance and long service life in demanding conditions
• High-Strength Performance – 78,000 psi tensile strength ensures secure, vibration-resistant connections that withstand heavy mechanical loads
• Precision Thread Engagement – Class 2B (inch) and Class 6H (metric) thread fits guarantee accurate mating and prevent cross-threading damage
• Optimized Torque Application – External 1/2" hex drive with 2-1/2" length offers excellent wrench clearance and maximum torque transfer capability
• Industry Compliance Assurance – Meets ASTM A108 and ASTM B633 specifications for consistent quality and dimensional accuracy across production batches
• Environmental Responsibility – RoHS 3 compliant construction supports sustainable manufacturing practices while maintaining performance integrity

Professional Applications & Engineering Value

This female hex thread adapter solves critical interface challenges in industrial equipment maintenance, manufacturing systems, and machinery upgrades where inch-to-metric conversion is required. The zinc-plated steel construction provides essential corrosion protection in humid or outdoor environments, while the Rockwell B85 hardness ensures the adapter maintains dimensional stability under repeated installation cycles. The precision Class 2B/6H thread fit prevents galling and seizing during assembly, particularly valuable in maintenance operations where thread damage can cause costly downtime. The generous 2-1/2" hex length accommodates standard wrenching tools without slippage, making it ideal for hydraulic systems, power transmission equipment, and heavy machinery where reliable thread adaptation is critical for operational continuity.

Specification Summary & Compliance

This adapter maintains Class 2B thread fit for the 1/4"-20 side and Class 6H fit for the M8×1.25 mm threads, ensuring precise engagement with standard mating components. Manufacturing complies with ASTM A108 (standard carbon and alloy steel bars) and ASTM B633 (zinc electroplating on iron and steel) specifications. 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 while maintaining mechanical performance requirements.