S-91268A911 7/8"-9 x 7" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity – Grade 8 classification and 150,000 PSI tensile strength ensure reliable performance under extreme mechanical stress.
• Superior Wear & Corrosion Resistance – Made from high-strength steel with Rockwell C33 hardness for long-term durability in harsh environments.
• Easy Installation & High Torque Transfer – External hex drive and 1 5/16" head width provide secure grip and efficient assembly with standard tools.
• Optimized Thread Engagement – Coarse 7/8"-9 UNC thread with Class 2A fit offers quick, secure fastening and reduced cross-threading risk.
• Versatile Partial Threading – Minimum 2 1/4" thread length allows for both clamping and alignment flexibility in structural assemblies.
• Industry-Standard Compliance – Meets ASME B18.2.1 and SAE J429 specifications, ensuring interchangeability and engineering consistency.
• Environmentally Responsible Manufacturing – RoHS 3 and REACH compliant for safe use in regulated industrial and construction applications.

Professional Applications & Engineering Value

This Grade 8 steel hex head screw is engineered to address critical challenges in heavy machinery, structural steel framing, and high-vibration equipment. The 7/8"-9 UNC coarse thread design ensures rapid assembly and secure holding power, while the partially threaded shank provides unthreaded grip length for precise joint clamping. With a 150,000 PSI tensile strength and Rockwell C33 hardness, it resists shear forces and fatigue in demanding applications such as construction, mining, and transportation equipment. The external hex drive and large head profile enable high torque application, reducing installation time and improving worksite efficiency without compromising on ASME B18.2.1 dimensional standards.

Specification Summary & Compliance

This fastener features a Class 2A thread fit per UNC standards, ensuring consistent interchangeability and assembly precision. Manufacturing adheres to ASME B18.2.1 and SAE J429 specifications for dimensional and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial supply chains.