S-91247A725 1/2"-13 x 3 1/4" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 120,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
• Optimized thread engagement with UNC coarse threads and Class 2A fit ensuring secure fastening and vibration resistance
• Enhanced installation efficiency featuring external hex drive and 3/4" head width for superior torque application
• Proven material durability with Rockwell C25 hardness maintaining structural integrity under repeated stress
• Versatile partial threading allowing both clamping and alignment functions in complex assemblies
• Regulatory compliance assurance meeting ASME B18.2.1 and SAE J429 specifications for quality and safety

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers critical engineering solutions where high tensile strength and corrosion resistance are paramount. The zinc plated steel construction protects against environmental degradation in outdoor construction, industrial machinery, and structural applications. Featuring 1/2"-13 UNC coarse threads with Class 2A fit, the fastener ensures rapid installation and maintains clamping force in vibrating environments. The partially threaded design provides both threaded engagement and smooth shank benefits, making it ideal for applications requiring both precise alignment and secure fastening. With external hex drive and substantial 3/4" head width, installers achieve maximum torque transfer without stripping, reducing assembly time and improving joint reliability in heavy-duty applications.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit tolerances with 1/2"-13 UNC coarse thread specifications. Complies with ASME B18.2.1 and SAE J429 Grade 5 standards for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. The fastener maintains 120,000 psi tensile strength and Rockwell C25 hardness as specified for Grade 5 classification, ensuring consistent performance across industrial applications.