S-90357A137 1/4"-20 x 3/8" Alloy Steel Ultra-Low-Profile Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating for extended service life in harsh industrial environments
• Exceptional tensile strength of 140,000 psi ensures reliable performance under high-stress applications
• Precision Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies
• Ultra-low socket head profile enables installation in confined spaces while maintaining high torque capability
• Rockwell C32 hardness delivers excellent wear resistance and durability through repeated use
• Coarse UNC threading allows for faster installation and reduced cross-threading risks
• Full compliance with RoHS 3 and REACH regulations ensures environmental responsibility and global market acceptance

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these black-oxide alloy steel socket head cap screws combine material excellence with precision manufacturing to solve critical fastening challenges. The UNC 1/4"-20 coarse thread configuration with Class 3A fit ensures rapid assembly while maintaining vibration resistance in machinery, automotive, and heavy equipment applications. The ultra-low profile socket head design provides maximum torque transmission in space-constrained environments, while the black-oxide surface treatment offers superior corrosion protection without compromising dimensional accuracy. These fully threaded screws deliver consistent clamping force distribution, making them ideal for high-stress joints requiring reliable, long-term performance in challenging operating conditions.

Specification Summary & Compliance

This socket head cap screw features precision UNC 1/4"-20 threads with Class 3A fit tolerance, ensuring exact dimensional compliance with industrial standards. The manufacturing process maintains strict length tolerance of -0.005" to 0.005" for consistent performance. The product fully complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the latest compliance requirements for industrial fasteners. The combination of alloy steel material, precise thread geometry, and controlled hardness (Rockwell C32) ensures reliable performance across various engineering applications while maintaining regulatory compliance.