S-91247A239 3/8"-24 x 5" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Enhanced load-bearing capacity with Grade 5 classification and 120,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance through zinc plating, extending service life in demanding industrial environments
• Precise thread engagement with UNF fine threading (3/8"-24) and Class 2A fit ensuring vibration resistance and secure fastening
• Optimized torque transmission via external hex drive and 9/16" head width for efficient installation with standard tools
• Controlled thread engagement through partially threaded design preventing over-tightening and simplifying alignment
• Regulatory compliance assurance meeting ASME B18.2.1, SAE J429 standards, plus RoHS 3 and REACH environmental directives
• Consistent hardness performance with Rockwell C25 rating maintaining structural integrity under repeated loading

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers critical engineering solutions for industrial assembly challenges where vibration resistance and structural integrity are paramount. The 3/8"-24 UNF fine threading provides superior holding power in materials prone to stress cracking, while the zinc plated steel construction combats environmental degradation in manufacturing facilities, outdoor equipment, and automotive applications. The partially threaded design concentrates engagement where needed most, preventing cross-threading in blind holes and simplifying disassembly for maintenance. With external hex drive compatibility, installers achieve optimal torque values using standard industrial tools, reducing installation time and improving workplace efficiency in production lines and machinery maintenance operations.

Specification Summary & Compliance

Manufactured to Class 2A thread fit tolerances with UNF fine thread specifications (3/8"-24) and 1" minimum thread length. Complies with ASME B18.2.1 and SAE J429 standards for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. The 5" length with partial threading provides versatile application coverage while maintaining 120,000 psi tensile strength and Rockwell C25 hardness as specified for Grade 5 fasteners.