S-90124A537 1/4"-20 x 1/2" 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
• Zinc-plated steel construction provides superior corrosion resistance for extended service life in harsh industrial environments
• Grade 5 classification guarantees consistent mechanical properties and load-bearing capacity for critical fastening applications
• UNC coarse threading enables faster installation and superior resistance to vibration loosening compared to fine thread alternatives
• External hex drive design allows for high torque application with standard tools, ensuring secure fastening in confined spaces
• Class 2A thread fit provides optimal balance between easy assembly and secure engagement for production efficiency
• Full threading along the entire shank length offers maximum grip and adjustment flexibility in various material thicknesses

Professional Applications & Engineering Value

These Grade 5 hex head screws deliver exceptional engineering value through their robust zinc-plated steel construction and UNC coarse threading, specifically designed to address common industrial challenges. The combination of 120,000 psi tensile strength and Rockwell C25 hardness ensures reliable performance in heavy machinery, structural assemblies, and equipment manufacturing where vibration resistance and load-bearing capacity are critical. The external hex drive facilitates efficient installation with standard tools, while the coarse thread pattern provides superior holding power in various materials including steel, aluminum, and cast components. These industrial-grade fasteners solve vibration-induced loosening problems and maintain clamping force under dynamic loads, making them ideal for automotive, construction, and manufacturing applications requiring durable fastening solutions that withstand rigorous operating conditions.

Specification Summary & Compliance

This 1/4"-20 x 1/2" hex head screw features precision Class 2A thread fit with UNC coarse threading and right-hand thread direction, manufactured to exacting dimensional standards. The fastener meets ASME B18.2.1 specifications and SAE J429 Grade 5 requirements for mechanical properties. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and workplace safety, while the fully threaded design and external hex drive provide consistent performance across industrial applications requiring reliable, high-strength fastening solutions.