S-90128A206 8-32 x 1 3/4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Superior corrosion resistance from zinc plating protects against rust and environmental degradation, extending service life in harsh industrial settings.
• Precise Class 3A thread fit guarantees tight, secure fastening with minimal play, enhancing assembly accuracy and vibration resistance.
• High hardness (Rockwell C37) provides excellent wear resistance, maintaining thread integrity and drive engagement through repeated use.
• Partially threaded design allows for controlled clamping force and easier alignment in components requiring specific unthreaded shank sections.
• Standard hex socket drive (9/64") enables high-torque installation with common tools, streamlining assembly and maintenance processes.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency, environmental safety, and global regulatory acceptance for supply chain integration.

Professional Applications & Engineering Value

These 8-32 UNC Socket Head Cap Screws are engineered to address critical challenges in industrial machinery, automotive assemblies, and heavy equipment where vibration resistance and mechanical reliability are paramount. The zinc-plated alloy steel construction combats corrosion in humid or chemically aggressive environments, while the coarse UNC thread facilitates quick installation and robust holding power in metals and engineered plastics. The Class 3A thread fit minimizes loosening under dynamic loads, making these screws ideal for precision components, motor mounts, and structural frames that demand consistent clamp load and long-term durability without frequent retightening.

Specification Summary & Compliance

Manufactured to ASTM A574 specifications, these screws feature 8-32 UNC coarse threads with a Class 3A fit for precise dimensional accuracy. The partially threaded design includes a minimum thread length of 3/4" on a 1 3/4" overall length, with a standard socket head profile and 9/64" hex drive. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms adherence to environmental and safety regulations for hazardous substance restrictions.