S-91247A502 1"-14 x 9" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 120,000 psi tensile strength, ideal for heavy-duty structural and machinery applications.
• Superior corrosion resistance due to zinc plating, extending service life in harsh industrial environments.
• Precise thread engagement with Class 2A fit and extra fine 1"-14 thread pitch, ensuring secure, vibration-resistant connections.
• High durability and wear resistance from Rockwell C25 hardness, maintaining fastener integrity under repeated stress.
• Reliable installation and removal with external hex drive and 1 1/2" head width, allowing for high-torque application with standard tools.
• Optimized weight distribution through partial threading design, providing strong clamping force over the 9" length.
• Compliance with major industry standards including ASME B18.2.1 and Grade 5 specifications, guaranteeing consistent quality and performance.

Professional Applications & Engineering Value

This Grade 5 hex head screw is engineered to address critical challenges in heavy machinery, construction, and structural steel assembly. The zinc plated steel construction provides reliable corrosion protection, essential for outdoor or high-moisture environments. Its extra fine thread (1"-14) and Class 2A thread fit deliver superior vibration resistance and precise alignment in applications where fine adjustment is crucial, such as precision equipment mounting or large-scale structural frameworks. The partially threaded design concentrates clamping force effectively, reducing the risk of joint loosening under dynamic loads. With a 9" length and external hex drive, it offers both deep penetration and easy installation in confined spaces, making it a versatile choice for industrial contractors and OEMs seeking durable, high-performance heavy-duty fasteners.

Specification Summary & Compliance

This fastener adheres to Class 2A thread fit tolerances per UNS standards, ensuring precise dimensional accuracy. It meets ASME B18.2.1 and SAE J429 Grade 5 specifications for mechanical properties and manufacturing consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in regulated markets without hazardous substance restrictions.