S-91247A225 3/8"-24 x 2 1/4" 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 120,000 psi tensile strength and Grade 5 classification for reliable performance in demanding applications
• Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
• Precise thread engagement with UNF fine threads and Class 2A fit, ensuring secure fastening and vibration resistance
• Optimized torque transmission via external hex drive and standard hex head design for easy installation with common tools
• Controlled thread engagement through partial threading, preventing over-tightening and material stress concentration
• Consistent hardness performance with Rockwell C25 rating, maintaining structural integrity under repeated loads
• Regulatory compliance assurance meeting ASME B18.2.1, SAE J429 standards and environmental regulations including RoHS 3 and REACH

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers exceptional engineering value for industrial assembly applications where vibration resistance and structural integrity are critical. The zinc plated steel construction provides durable corrosion protection in manufacturing environments, while the 3/8"-24 UNF fine threads with Class 2A fit ensure precise mating with corresponding components. The partially threaded design concentrates strength where needed most, preventing thread stripping in softer materials. Ideal for machinery assembly, automotive components, and structural frameworks, this fastener combines 120,000 psi tensile strength with Rockwell C25 hardness to withstand dynamic loads and thermal cycling. The external hex drive facilitates quick installation in confined spaces, making it suitable for production lines and maintenance operations requiring reliable, high-performance industrial fasteners.

Specification Summary & Compliance

This hex head screw features 3/8"-24 UNF fine threads with Class 2A thread fit ensuring dimensional accuracy per industry standards. Manufactured to meet ASME B18.2.1 and SAE J429 Grade 5 specifications, it delivers consistent mechanical properties including 120,000 psi tensile strength and Rockwell C25 hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, providing assurance for global industrial applications requiring certified components.