S-91257A655 3/8"-16 x 10" 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 150,000 PSI tensile strength for reliable performance in high-stress industrial environments
• Superior corrosion resistance through zinc yellow-chromate plating, extending service life in demanding conditions
• Optimized thread engagement with UNC coarse threading and Class 2A fit ensuring secure fastening and vibration resistance
• Enhanced durability with Rockwell C33 hardness providing excellent wear resistance and reduced deformation under load
• Easy installation and removal with external hex drive design allowing for standard wrench access and high torque application
• Precision manufacturing meeting ASME B18.2.1 and SAE J429 specifications for consistent quality and dimensional accuracy
• Versatile partial threading design offering flexibility for applications requiring both threaded and unthreaded sections

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers exceptional engineering value through its high-strength steel construction and zinc yellow-chromate plating, specifically engineered to address common industrial challenges. The 3/8"-16 UNC coarse thread configuration with Class 2A thread fit provides superior vibration resistance and prevents loosening in heavy machinery, construction equipment, and structural applications. The partial threading design allows for precise clamping force distribution, making it ideal for assemblies requiring both secure fastening and alignment. With its 150,000 PSI tensile strength and Rockwell C33 hardness, this fastener withstands extreme mechanical stresses while the corrosion-resistant plating ensures long-term reliability in harsh environments, reducing maintenance frequency and replacement costs.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit with 3/8"-16 UNC coarse threading and 10" length with partial threading. Manufactured to meet ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and performance consistency. The inch system measurements include 9/16" head width and 1/4" head height with external hex drive configuration. Compliant with industry standards for high-strength industrial fasteners, delivering reliable performance in demanding applications.