S-92620A131 1/2"-28 x 3" 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 applications
• Superior corrosion resistance through zinc yellow-chromate plating, extending service life in harsh environments
• Precision thread engagement with Class 2A fit and UNEF extra fine threading for secure fastening in thin materials
• Enhanced durability from Rockwell C33 hardness, maintaining structural integrity under repeated stress
• Optimized torque transmission through external hex drive design for efficient installation and removal
• Industry-standard compliance with ASME B18.2.1 and SAE J429 specifications for guaranteed quality and interchangeability
• Versatile partial threading allowing unthreaded shank sections for precise clamping and alignment control

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical engineering solutions where high tensile strength and corrosion resistance are paramount. The zinc yellow-chromate plated finish provides superior protection against oxidation in industrial environments, while the UNEF extra fine threading (1/2"-28) offers exceptional holding power in thin-section materials and precision assemblies. The partially threaded design with 1-1/4" minimum thread length ensures optimal stress distribution, making these steel fasteners ideal for heavy machinery, automotive systems, and structural applications requiring Class 2A thread fit precision. The external hex drive facilitates high-torque installation in confined spaces, delivering reliable performance where vibration resistance and long-term durability are essential.

Specification Summary & Compliance

Manufactured to exacting ASME B18.2.1 and SAE J429 standards, these hex head screws feature precision Class 2A thread fit tolerances and UNEF extra fine threading (1/2"-28) for consistent performance. The 3" length with partial threading and right-hand thread direction ensures compatibility with standard industrial applications. The zinc yellow-chromate plating meets corrosion resistance requirements while the Grade 8 classification guarantees mechanical properties including 150,000 psi tensile strength and Rockwell C33 hardness. All materials and processes comply with relevant industrial specifications for quality assurance.