S-90117A550 1/4"-20 x 2" ASME B18.3 Alloy Steel Wire-Lockable 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.
• Corrosion-resistant black-oxide coating on alloy steel provides enhanced durability and protection against rust, extending service life in various industrial environments.
• Precision Class 3A thread fit offers superior thread engagement and vibration resistance, minimizing loosening and ensuring secure fastening in critical assemblies.
• Hex socket drive design with 3/16" drive size allows for high torque application and easy installation in confined spaces, improving assembly efficiency.
• Partially threaded shank enables precise clamping control, ideal for applications where specific unthreaded grip length is required for optimal joint integrity.
• Compliance with ASME B18.3 standards guarantees consistent quality and dimensional accuracy, ensuring interchangeability and reliability in professional applications.
• RoHS 3 and REACH compliance ensures environmental safety and regulatory adherence, making it suitable for global supply chains and sensitive industries.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration-induced loosening and corrosion in harsh environments. The 1/4"-20 UNC coarse thread with Class 3A fit provides excellent holding power and resistance to dynamic loads, making it ideal for machinery, automotive, and heavy equipment applications. The partially threaded design allows for precise placement and clamping force distribution, reducing stress concentration points. Combined with a Rockwell C37 hardness, it maintains structural integrity under repetitive use, while the hex drive facilitates quick installation in tight spaces, enhancing productivity in assembly lines and maintenance operations.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with Class 3A thread fit for high precision and minimal tolerance. It complies with ASME B18.3 specifications for dimensional consistency and performance. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulatory requirements, ensuring environmental and health safety in industrial use.