S-90002A127 1/2"-13 x 3" ASME B18.2.1, SAE J429 High-Strength Steel Hex Head Screws with Material Certification

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with Grade 8 classification and 150,000 PSI tensile strength for reliable performance in high-stress environments.
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh industrial conditions.
• Optimized torque transmission through the external hex drive and 3/4" head width, ensuring secure installation with standard tools.
• Enhanced thread engagement with coarse 1/2"-13 UNC threads and Class 2A fit, reducing cross-threading risks and speeding assembly.
• Controlled flexibility and strength from Rockwell C33 hardness, balancing durability with resistance to brittle fracture.
• Versatile partial threading allowing unthreaded shank sections to bear shear loads effectively in structural applications.
• Compliance with industry standards including ASME B18.2.1 and SAE J429, ensuring interchangeability and consistent quality.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Grade 8 hex head screw addresses critical challenges in machinery assembly, construction, and automotive sectors where vibration resistance and long-term reliability are paramount. The zinc yellow-chromate plated steel construction combats oxidative degradation in humid or chemically aggressive environments, while the coarse UNC thread design maintains grip under dynamic loads. Its partially threaded configuration provides an unthreaded bearing surface that enhances shear strength, making it ideal for bolted joints requiring precise clamp load distribution. By meeting ASME B18.2.1 and SAE J429 specifications, it ensures compatibility with existing inch-system components, reducing downtime and replacement costs.

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 standards. The 1/2"-13 UNC coarse thread with a minimum thread length of 1-1/4" and overall 3" length ensures dimensional precision. Material and plating processes comply with RoHS and REACH environmental directives, providing a safe, high-performance industrial strength bolt solution.