S-91286A279 7/16"-14 x 2 3/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity: With a tensile strength of 150,000 psi and Rockwell C33 hardness, this screw withstands extreme forces, preventing failures in critical applications.
• Superior Corrosion Protection: The zinc-flake coating offers excellent resistance to rust and environmental degradation, ensuring long-term reliability even in harsh conditions.
• High-Strength Grade 8 Compliance: Meets SAE J429 Grade 8 standards, guaranteeing consistent performance and material quality for demanding industrial uses.
• Easy Installation & Removal: The external hex head design allows for straightforward tightening with common tools, reducing assembly time and effort.
• Secure Thread Engagement: Coarse UNC threads with Class 2A fit provide reliable fastening and vibration resistance, minimizing loosening in dynamic environments.
• Optimized Thread Design: Partially threaded shank concentrates strength where needed, enhancing grip and reducing stress concentration points.
• Broad Regulatory Compliance: Adheres to ASME B18.2.1, RoHS 3, and REACH standards, ensuring safety and environmental responsibility in global supply chains.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Grade 8 hex head screw addresses critical challenges in construction, machinery, and structural assemblies. The zinc-flake coated steel construction combats corrosion in outdoor or chemically aggressive environments, extending service life and reducing maintenance costs. Its 7/16"-14 UNC coarse thread and Class 2A thread fit ensure rapid installation and reliable performance under high vibration, making it ideal for equipment subjected to dynamic loads. The partial threading optimizes clamping force distribution, preventing joint failure in high tensile strength scenarios. By meeting ASME B18.2.1 and SAE J429 specifications, it provides assurance of dimensional accuracy and mechanical properties, essential for engineering integrity and procurement consistency.

Specification Summary & Compliance

This screw features a 2 3/4" length with 1 1/8" minimum thread length, 7/16"-14 UNC coarse threads, and Class 2A thread fit for precise engagement. It conforms to ASME B18.2.1 and SAE J429 Grade 8 standards, ensuring mechanical properties including 150,000 psi tensile strength and Rockwell C33 hardness. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for industrial use.