S-91247A232 3/8"-24 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 demanding applications
• Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
• Precise thread engagement with Class 2A fit and UNF fine threads ensuring secure fastening and vibration resistance
• Optimized torque transmission through external hex drive design and 9/16" head width for efficient installation
• Enhanced durability with Rockwell C25 hardness maintaining structural integrity under repeated stress
• Regulatory compliance assurance meeting ASME B18.2.1, SAE J429, RoHS 3 and REACH standards for global industrial use
• Versatile partial threading allowing both clamping and alignment functions in assembly applications

Professional Applications & Engineering Value

This Grade 5 steel hex head screw delivers critical engineering solutions for industrial assembly challenges. The 3/8"-24 UNF fine thread configuration provides superior resistance to vibrational loosening in machinery, automotive, and structural applications where dynamic loads are present. The zinc plated finish creates a protective barrier against oxidation and environmental corrosion, significantly extending service life in outdoor or moisture-exposed installations. With partial threading, the fastener offers dual functionality - the threaded portion ensures secure clamping while the unthreaded shank maintains precise alignment in bolted joints. The external hex drive and substantial head dimensions facilitate high-torque installation using standard tools, reducing assembly time while maintaining the 120,000 psi tensile strength required for heavy-duty fastening applications across multiple industrial sectors.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance ensuring consistent performance across applications. The 3/8"-24 UNF fine thread configuration follows established industrial standards while the 3-1/4" length provides versatile fastening options. Compliance with ASME B18.2.1 and SAE J429 specifications guarantees mechanical properties and dimensional accuracy. Environmental regulations are met through RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) adherence, ensuring safe use in regulated markets.