S-90969A310 5/16"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength: Withstands up to 140,000 psi for reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior Corrosion Resistance: Black oxide finish provides a durable protective layer, extending service life in harsh industrial environments.
• Precision Thread Fit: Class 3A thread fit ensures tight, secure connections with minimal backlash, enhancing assembly accuracy.
• Optimized Socket Head Design: Ultra-low profile and knurled texture allow for easy installation and removal in confined spaces, improving maintenance efficiency.
• High Material Hardness: Rockwell C30 hardness offers excellent wear resistance, maintaining dimensional stability under repeated use.
• Coarse Thread Advantage: UNC coarse threads enable quick assembly and disassembly, saving time in production and repair operations.
• Regulatory Compliance: Meets RoHS 3 and REACH standards, ensuring safety and environmental responsibility for global supply chains.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in industrial settings, such as misalignment and vibration-induced loosening. The 5/16"-18 UNC thread with coarse spacing facilitates rapid installation in machinery, automotive, and aerospace assemblies, while the black oxide finish resists corrosion from oils and moisture. The ultra-low socket head and knurled texture provide a secure grip for hex drivers, enabling precise torque application in tight spaces. With a shoulder diameter of 3/8" and length of 1/2", it acts as a reliable pivot or spacer in rotating components, reducing wear and ensuring long-term operational integrity. Ideal for applications demanding high tensile strength and dimensional accuracy, this screw minimizes downtime and maintenance costs.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A fit for precise thread engagement. Dimensions include a shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005", ensuring consistent performance. Manufactured from alloy steel with a hardness of Rockwell C30, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental and safety standards are met for industrial use.