S-91268A887 3/4"-10 x 9" 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, this screw reliably handles high-stress applications without failure.
• Superior Durability and Wear Resistance: Grade 8 steel construction and Rockwell C33 hardness ensure long service life in demanding industrial environments.
• Secure and Easy Installation: The external hex drive and 1 1/8" head width provide excellent torque transfer and grip for straightforward assembly.
• Optimized Thread Engagement: UNC coarse threads and Class 2A thread fit offer quick assembly and reliable fastening in various materials.
• Versatile Partial Threading: The 2" minimum thread length allows for flexibility in clamping applications while maintaining unthreaded shank strength.
• Compliance with Industry Standards: Meets ASME B18.2.1 and SAE J429 specifications, ensuring consistent quality and interchangeability.
• Environmentally Responsible Manufacturing: RoHS 3 and REACH compliance guarantees safe use in regulated industries and global markets.

Professional Applications & Engineering Value

This Grade 8 steel hex head screw is engineered to address critical challenges in heavy machinery, construction, and structural assemblies where vibration resistance and high tensile loads are paramount. The 3/4"-10 UNC coarse thread design ensures rapid installation and reduced cross-threading risks, while the partial threading provides enhanced shear strength in dynamic load conditions. Made from high-strength steel with a Rockwell C33 hardness, it withstands extreme forces and repetitive stress without deforming. The external hex drive and substantial head dimensions allow for high-torque application using standard tools, making it ideal for bolted connections in industrial equipment, automotive frames, and infrastructure projects that demand reliability under pressure.

Specification Summary & Compliance

This fastener features precise Class 2A thread fit per UNC standards, ensuring consistent engagement and interchangeability. It complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. Additionally, it is verified to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for hazardous substances.