S-90344A114 1/4"-20 x 1/2" ASME B18.3, ASTM A574 Socket Head Screws with Flat Washer

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, minimizing fastener failure risks.
• Precision Class 3A thread fit guarantees smooth installation and secure, vibration-resistant connections in demanding environments.
• Integrated flat washer distributes load evenly, reducing surface damage and enhancing joint integrity under heavy loads.
• Black-oxide coating on alloy steel provides superior corrosion resistance and durability in harsh industrial conditions.
• Hex socket drive design allows for high-torque installation with standard tools, ensuring tight, secure fastening in confined spaces.
• Coarse UNC threads enable quick assembly and disassembly, improving maintenance efficiency and reducing downtime.
• Full threading along the 1/2" length offers versatile positioning and consistent clamping force across the entire fastener.

Professional Applications & Engineering Value

Engineered for high-stress industrial applications, these black-oxide alloy steel socket head cap screws address critical challenges in machinery, automotive, and heavy equipment assembly. The coarse UNC thread design resists loosening under vibration, while the integrated flat washer prevents surface indentation and distributes clamping force effectively. With a Rockwell C39 hardness and 170,000 psi tensile strength, they provide reliable fastening in structural components, ensuring long-term performance and reducing maintenance needs. The hex drive facilitates easy installation in tight spaces, making them ideal for precision engineering projects requiring durability and compliance with stringent standards.

Specification Summary & Compliance

This socket head cap screw features a 1/4"-20 UNC coarse thread with Class 3A fit for precise dimensional accuracy. It meets ASME B18.3 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity. The assembly includes a black-oxide steel flat washer with a 1/2" OD and 1/16" thickness, adhering to inch system measurements for consistent performance in industrial fastening applications.