S-90124A540 1/4"-20 x 3/4" ASME B18.2.1, SAE J429 Steel Wire-Lockable Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure
• Superior corrosion resistance from zinc-plated steel construction extends service life in harsh industrial environments
• Precision Class 2A thread fit provides consistent engagement and reliable assembly in coarse UNC threading applications
• Grade 5 strength classification with Rockwell C25 hardness delivers optimal balance of strength and durability for industrial fastening
• Full threading design maximizes grip length and distributes load evenly across the entire fastener
• External hex drive compatibility allows for standard tooling and efficient installation in confined spaces
• Comprehensive compliance with ASME B18.2.1, RoHS 3, and REACH ensures regulatory acceptance and environmental safety

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers exceptional engineering value through its zinc-plated steel construction and UNC coarse threading, specifically designed to address industrial fastening challenges. The combination of 120,000 psi tensile strength and Rockwell C25 hardness provides critical resistance against vibration-induced loosening and mechanical stress in heavy machinery, structural assemblies, and equipment manufacturing. The fully threaded design ensures maximum holding power across the entire 3/4" length, while the external hex drive facilitates rapid installation and removal with standard tools. This fastener solves common industrial pain points including corrosion degradation, thread stripping, and assembly inconsistency, making it ideal for automotive, construction, and manufacturing applications requiring reliable, high-strength fastening solutions that maintain integrity under continuous operational stress.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit tolerance with 1/4"-20 UNC coarse threading manufactured to precise dimensional standards. The screw conforms to ASME B18.2.1 specifications and SAE J429 Grade 5 requirements, ensuring consistent performance across industrial applications. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental safety and restricted substance adherence, making this hex head screw suitable for global industrial supply chains requiring verified regulatory compliance.