S-91247A896 7/8"-9 x 6" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength and reliability with Grade 5 classification, ensuring consistent performance under high-stress conditions and a tensile strength of 120,000 psi.
• Superior corrosion resistance provided by the zinc plating, extending the fastener's service life in harsh industrial environments.
• Optimized for high-torque applications thanks to the external hex drive and large 1 5/16" head width, allowing for secure and efficient installation.
• Reliable coarse threading (UNC) that resists loosening from vibrations and is easier to start in rough or tapped holes.
• Precise Class 2A thread fit for smooth assembly and a secure hold without galling or cross-threading issues.
• Versatile partial threading design offering an unthreaded shank for enhanced shear strength where needed in structural connections.
• Full compliance with industry standards including ASME B18.2.1 and SAE J429, guaranteeing interchangeability and engineering consistency.

Professional Applications & Engineering Value

This Grade 5 hex head screw is engineered to solve critical challenges in heavy machinery, construction, and structural steel applications. The zinc plated steel construction provides a durable barrier against rust and oxidation, essential for outdoor or high-moisture environments. Its 7/8"-9 UNC coarse threads and Class 2A fit ensure rapid, reliable assembly even in less-than-ideal conditions, reducing installation time and preventing thread damage. The external hex drive and substantial head dimensions allow for high torque application, making it ideal for bolted connections requiring significant clamping force. The partially threaded design concentrates the thread engagement where it's needed most, improving resistance to vibrational loosening and shear forces in industrial fastening systems.

Specification Summary & Compliance

This fastener features a 7/8"-9 UNC thread with Class 2A tolerance for precise fit, a minimum thread length of 2", and a total length of 6". It is manufactured to meet ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for use in various industrial and international markets.