S-90357A139 1/4"-20 x 9/16" Alloy Steel Ultra-Low-Profile Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 140,000 psi provides reliable performance in high-stress applications, reducing the risk of fastener failure.
• Class 3A thread fit ensures precise, tight engagement for superior vibration resistance and secure assemblies.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance, extending service life in harsh industrial environments.
• Ultra-low socket head profile allows installation in confined spaces, enabling versatile design options.
• Fully threaded design delivers consistent holding power along the entire length for maximum grip.
• Rockwell C32 hardness provides excellent durability and wear resistance, minimizing deformation under load.
• Compliance with RoHS 3 and REACH ensures environmental safety and meets global regulatory standards for industrial components.

Professional Applications & Engineering Value

These socket head cap screws with Black-Oxide Alloy Steel construction are engineered to address critical challenges in industrial settings. The 1/4"-20 UNC coarse threads and Class 3A precision fit prevent loosening under vibration, making them ideal for machinery, automotive assemblies, and heavy equipment. The ultra-low profile head and fully threaded design ensure easy installation in tight spaces while providing uniform clamping force. With high tensile strength and corrosion-resistant coating, they offer long-term reliability in demanding applications, reducing maintenance needs and downtime.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC thread with Class 3A fit for high precision, a length of 9/16" with tolerance of -0.005" to 0.005", and Rockwell C32 hardness. It adheres to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it meets environmental and safety standards for industrial use.