S-91286A465 3/4"-10 x 3 1/4" 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 Grade 8 classification and 150,000 psi tensile strength for reliable performance in the most demanding applications.
• Superior corrosion resistance due to the zinc-flake coating, extending service life in harsh industrial environments.
• High hardness rating of Rockwell C33 minimizes wear and deformation, ensuring fastener integrity under stress.
• Optimized for quick assembly with UNC coarse threading and external hex drive, allowing for efficient installation with standard tools.
• Precise thread fit (Class 2A) ensures smooth engagement and reduces the risk of cross-threading during installation.
• Versatile partial threading provides an unthreaded shank for enhanced shear strength where needed.
• Compliance with major industry standards including ASME B18.2.1 and SAE J429, guaranteeing interchangeability and reliability.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to solve critical fastening challenges in heavy machinery, construction, and automotive assemblies. The zinc-flake coated steel construction offers outstanding protection against rust and chemical exposure, significantly reducing maintenance costs and downtime. Its UNC coarse thread design ensures rapid installation and high resistance to vibration loosening, making it ideal for structural connections and equipment that undergoes dynamic loads. The external hex drive and robust head design allow for high torque application, providing a secure, reliable clamp in high-stress environments. By integrating high tensile strength with superior corrosion resistance, this fastener delivers long-term performance and safety in industrial applications where failure is not an option.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including Class 2A thread fit for consistent engagement and UNC coarse threading (3/4"-10) per ASME B18.2.1 and SAE J429 specifications. It is manufactured from high-strength steel and features a zinc-flake coating for enhanced durability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety requirements for industrial use worldwide.