S-90969A440 3/8"-16 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 140,000 psi for reliable performance in high-stress industrial applications
• Precision Class 3A thread fit ensures tight, secure fastening with minimal backlash in assemblies
• Black oxide finish provides enhanced corrosion resistance, extending service life in demanding environments
• Knurled ultra-low socket head allows for easy installation and removal with standard hex tools, even in confined spaces
• Alloy steel construction with Rockwell C30 hardness delivers superior durability and wear resistance
• Coarse 3/8"-16 UNC threading enables quick assembly and disassembly while maintaining strong holding power
• Precision shoulder diameter and length with tight tolerances ensures accurate alignment and smooth rotational movement

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to solve critical alignment and rotational movement challenges in industrial machinery. The precision shoulder diameter with tight tolerances (-0.004" to -0.002") provides exact bearing surfaces for gears, pulleys, and rotating components, eliminating misalignment issues that cause premature wear. The Class 3A thread fit combined with coarse UNC threading ensures vibration-resistant fastening in high-load applications while allowing for quick maintenance access. The black oxide finish protects against corrosion in manufacturing environments, while the ultra-low socket head profile with knurling offers superior grip for installation in space-constrained assemblies. These features make it ideal for precision equipment, automotive systems, and industrial automation where reliable rotational guidance and long-term performance are essential.

Specification Summary & Compliance

This shoulder screw maintains Class 3A thread fit per UNC standards with precise shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". Manufactured from alloy steel with Rockwell C30 hardness and 140,000 psi tensile strength, it meets industrial performance requirements. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental regulatory adherence for global industrial applications.