S-91283A476 1 1/2"-6 x 8" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – With 100,000 psi tensile strength, this screw provides reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior Hardness & Durability – Rockwell C19 hardness ensures excellent wear resistance and long service life, even in demanding industrial environments.
• Coarse Thread Design for Quick Assembly – The 1 1/2"-6 UNC coarse thread allows for faster installation and better grip in softer materials, improving efficiency on the job site.
• Precision Thread Fit – Class 2A thread fit ensures consistent, secure fastening with standard nuts, minimizing loosening under vibration.
• Partially Threaded Shank for Enhanced Clamping – The unthreaded portion increases shear strength and provides better alignment in structural connections.
• External Hex Drive for High Torque Application – The hex head design enables easy tightening with common tools, supporting high torque requirements without stripping.
• Compliance with Industry Standards – Meets ASME B18.2.1 and SAE J429 specifications, ensuring interoperability and reliability in engineered systems.

Professional Applications & Engineering Value

This Grade 5 steel hex head screw is engineered to address critical fastening challenges in heavy machinery, construction, and structural assemblies. The 1 1/2"-6 UNC coarse threading and Class 2A fit provide superior resistance to vibration loosening, making it ideal for dynamic load conditions. With 100,000 psi tensile strength and Rockwell C19 hardness, it withstands extreme forces and environmental wear, reducing maintenance frequency. The partially threaded design enhances clamping force distribution, preventing joint failure in industrial applications such as equipment frames, trailers, and bolted connections. Its compliance with ASME B18.2.1 ensures dimensional accuracy and compatibility, offering a dependable solution for engineers prioritizing safety and longevity.

Specification Summary & Compliance

This fastener adheres to Class 2A thread fit per UNC standards, with precise dimensions including 8" length and 1 1/2"-6 thread size. It conforms to ASME B18.2.1 and SAE J429 manufacturing specifications, ensuring consistent quality. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for global industrial use.