S-91257A677 7/16"-14 x 2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength: With a 150,000 psi tensile strength, this screw provides reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior Corrosion Resistance: The zinc yellow-chromate plating offers enhanced protection against rust and environmental degradation, extending service life in harsh conditions.
• High Hardness for Durability: Rockwell C33 hardness ensures the screw maintains its integrity under heavy loads and repeated use, minimizing wear and deformation.
• Optimized Clamping Force: The partially threaded design allows for better grip and distribution of clamping force, improving joint stability in assembled structures.
• Easy Installation with External Hex Drive: The hex head and external hex drive enable quick and secure tightening using standard tools, saving time during assembly.
• Precise Thread Fit: Class 2A thread fit ensures consistent engagement and reduces the likelihood of cross-threading, enhancing installation reliability.
• Compliance with Industry Standards: Meets ASME B18.2.1 and SAE J429 specifications, assuring quality and interoperability in professional engineering projects.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in industrial settings, such as vibration-induced loosening and corrosion in demanding environments. Made from high-strength steel and featuring a zinc yellow-chromate plated finish, it combats moisture and chemical exposure, making it ideal for machinery, construction, and automotive assemblies. The 7/16"-14 UNC coarse thread and partially threaded design provide superior grip in materials like metal and wood, ensuring lasting connections without slippage. By delivering 150,000 psi tensile strength and Rockwell C33 hardness, it supports heavy-duty applications where reliability is paramount, reducing maintenance needs and downtime.

Specification Summary & Compliance

This fastener adheres to precise dimensional tolerances, including a Class 2A thread fit and UNC coarse thread specifications, ensuring compatibility and ease of use. It complies with ASME B18.2.1 and SAE J429 standards for consistent performance. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for global industrial use.