S-90117A125 8-32 x 1/2" ASME B18.3 Alloy Steel Wire-Lockable Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi provides reliable load-bearing capacity and resistance to mechanical failure in demanding applications.
• Class 3A thread fit ensures precise, secure fastening with minimal risk of cross-threading, improving assembly efficiency and joint integrity.
• Black-oxide finish on alloy steel offers enhanced corrosion resistance and a durable, low-glare surface suitable for various industrial environments.
• Rockwell C37 hardness delivers excellent wear resistance and maintains thread form under repeated use, extending service life.
• Fully threaded UNC coarse design allows for maximum grip length and faster installation in a wide range of materials.
• Hex socket drive (9/64") enables high-torque application with standard tools, reducing slippage and tool wear.
• Compliance with ASME B18.3, RoHS 3, and REACH guarantees consistent quality, safety, and environmental standards for global supply chains.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in machinery assembly, automotive components, and precision equipment. The 8-32 UNC coarse thread with Class 3A fit ensures rapid, vibration-resistant fastening in metals and plastics, reducing installation time and maintenance needs. The high tensile strength (170,000 psi) and Rockwell C37 hardness provide durability under dynamic loads, preventing stripping and fatigue in high-stress joints. Its fully threaded, right-hand design offers uniform clamping force, making it ideal for enclosures, brackets, and fixtures where reliability and repeatability are paramount. The black-oxide surface treatment adds a layer of oxidation resistance without compromising dimensional accuracy, supporting long-term performance in industrial settings.

Specification Summary & Compliance

This screw features an 8-32 UNC thread with Class 3A precision tolerance for consistent fit and function. It adheres to ASME B18.3 manufacturing specifications, ensuring dimensional accuracy and interchangeability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted substances and supporting sustainable procurement practices.