S-91286A271 7/16"-14 x 1 3/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity: With a tensile strength of 150,000 psi and Rockwell C33 hardness, these screws withstand extreme stress in demanding applications without failure.
• Superior Corrosion Protection: The zinc-flake coating provides long-lasting resistance to rust and environmental degradation, extending service life in harsh conditions.
• Reliable Thread Engagement: UNC coarse threads and Class 2A fit ensure easy installation and secure, vibration-resistant fastening in industrial settings.
• Optimized for Heavy-Duty Use: Grade 8 strength classification and partial threading design deliver maximum clamping force where high mechanical performance is critical.
• Industry-Standard Compliance: Manufactured to ASME B18.2.1 and SAE J429 specifications for guaranteed dimensional accuracy and interchangeability.
• Enhanced Safety and Environmental Responsibility: Full compliance with RoHS 3 and REACH regulations ensures safe usage and environmental protection.
• Efficient Installation and Removal: External hex drive and 5/8" head width allow for quick assembly and disassembly using standard tools, reducing labor time.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Grade 8 hex head screw addresses critical challenges in construction, machinery assembly, and structural fastening. The steel material combined with Rockwell C33 hardness provides exceptional resistance to shear and tensile forces, preventing joint failure under dynamic loads. The zinc-flake coated finish significantly enhances corrosion resistance, making it ideal for outdoor or chemically aggressive environments where durability is paramount. With 7/16"-14 UNC coarse threads and partial threading, it offers superior grip in soft materials and reduces the risk of cross-threading during installation. These features ensure reliable performance in high-vibration settings, such as automotive frames, industrial equipment, and infrastructure projects, where fastener integrity directly impacts operational safety and longevity.

Specification Summary & Compliance

This screw maintains precise Class 2A thread fit and UNC coarse thread specifications for consistent performance. It conforms to ASME B18.2.1 and SAE J429 manufacturing standards, ensuring dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmental safety and regulatory adherence in global supply chains.