S-90124A539 1/4"-20 x 5/8" ASME B18.2.1, SAE J429 Steel Wire-Lockable Hex Head Screws

Key Features & Benefits at a Glance

• Enhanced Durability & Corrosion Resistance – Zinc-plated steel construction provides reliable protection against rust and environmental degradation in demanding industrial settings.
• High Tensile Strength for Heavy-Duty Applications – With 120,000 psi tensile strength, this screw withstands extreme loads and vibrations without failure.
• Precision Thread Fit for Secure Fastening – Class 2A UNC coarse threads ensure easy installation and consistent, vibration-resistant connections.
• Superior Hardness for Long-Term Performance – Rockwell C25 hardness maintains structural integrity under repetitive stress and mechanical wear.
• Full Threading for Maximum Grip – Fully threaded design distributes clamping force evenly, reducing the risk of loosening in critical assemblies.
• Compliance with Industry Standards – Meets ASME B18.2.1, SAE J429, RoHS 3, and REACH, ensuring safety and regulatory adherence.
• External Hex Drive for Efficient Installation – Hex head allows for quick, high-torque tightening with standard tools, boosting assembly productivity.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Grade 5 zinc-plated steel hex head screw addresses common challenges like joint failure, corrosion, and assembly inefficiency. The UNC coarse thread and Class 2A fit enable rapid installation in metals and composites, minimizing cross-threading risks. With a tensile strength of 120,000 psi and Rockwell C25 hardness, it sustains structural integrity in machinery, automotive frames, and construction equipment—even under dynamic loads. The zinc plating adds a protective barrier, extending service life in humid or outdoor environments. Fully threaded for uniform stress distribution, it is ideal for high-vibration settings where reliable, long-term fastening is non-negotiable.

Specification Summary & Compliance

This screw adheres to ASME B18.2.1 and SAE J429 Grade 5 standards, with precise Class 2A thread fit and UNC coarse threading (1/4"-20). Dimensions include a 5/8" length, 7/16" head width, and fully threaded shank. It is confirmed RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting environmental and safety regulations for industrial use.