S-91247A935 1"-8 x 9" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – With 120,000 psi tensile strength, this screw provides reliable, high-load fastening for demanding industrial applications.
• Superior Corrosion Resistance – Zinc plating offers enhanced protection against rust and environmental degradation, extending service life in harsh conditions.
• Optimized Thread Design – 1"-8 UNC coarse threads with Class 2A fit ensure quick assembly, reduced cross-threading risk, and secure engagement in various materials.
• High Hardness & Durability – Rockwell C25 hardness ensures the screw maintains its integrity under high stress and repeated use.
• Easy Installation & Removal – External hex drive and hex head design allow for straightforward tightening with standard tools, improving installation efficiency.
• Partial Threading Versatility – Partially threaded shank provides unthreaded grip length for applications requiring clamping force without full thread engagement.
• Regulatory Compliance & Quality Assurance – Meets ASME B18.2.1, SAE J429, RoHS 3, and REACH standards, ensuring safety, environmental responsibility, and consistent performance.

Professional Applications & Engineering Value

This Grade 5 hex head screw is engineered to address critical fastening challenges in industrial machinery, structural assemblies, and heavy equipment. The zinc plated steel construction combats corrosion in demanding environments, while the 1"-8 UNC coarse threading and Class 2A thread fit deliver rapid, secure installation with high resistance to vibration loosening. Its partially threaded design is ideal for applications where a smooth shank is needed to bear shear loads, and the external hex drive ensures compatibility with common wrenches for efficient maintenance. With a tensile strength of 120,000 psi and Rockwell C25 hardness, it provides dependable performance in high-stress scenarios, reducing the risk of fastener failure and minimizing downtime.

Specification Summary & Compliance

This fastener adheres to Class 2A thread fit tolerances for consistent engagement and is manufactured in accordance with ASME B18.2.1 and SAE J429 specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for use in various industrial and international markets.