S-90969A360 5/16"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Strength & Durability: With a tensile strength of 140,000 psi and Rockwell C30 hardness, this screw withstands high-stress applications without deformation, ensuring long-term reliability in demanding environments.
• Precision Thread Fit for Secure Fastening: Class 3A thread fit provides tighter tolerances, reducing the risk of loosening under vibration and improving assembly accuracy in precision machinery.
• Superior Corrosion Resistance: The black oxide finish enhances protection against rust and wear, extending service life in humid or corrosive industrial settings.
• Optimized Shoulder Design for Alignment: The 1 1/2" shoulder length with standard fit ensures precise component positioning and smooth rotational movement, minimizing misalignment in assemblies.
• Low-Profile, Secure Drive: The ultra-low socket head with hex drive allows for compact installations and high torque application, while the knurled texture improves grip during handling.
• Coarse Threads for Quick Assembly: 5/16"-18 UNC coarse threads enable faster installation and reduced cross-threading risks, boosting efficiency in high-volume production lines.
• Compliance with Environmental Standards: RoHS 3 and REACH compliance ensures safety and regulatory adherence, making it suitable for global supply chains and eco-conscious industries.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in precision assemblies, such as maintaining alignment in rotating parts and resisting dynamic loads. The Class 3A thread fit and coarse UNC threads ensure secure, vibration-resistant connections in machinery like automated conveyors, robotic arms, and CNC equipment. The black oxide finish provides a durable barrier against corrosion, ideal for environments exposed to moisture or chemicals. With a 1 1/2" shoulder length and standard shoulder fit, it supports precise bushing and bearing placements, reducing wear and downtime. Its 140,000 psi tensile strength and Rockwell C30 hardness make it a reliable choice for high-stress industrial applications, enhancing operational safety and longevity.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A fit for high precision, featuring a shoulder diameter of 3/8" (tolerance: -0.004" to -0.002") and shoulder length of 1 1/2" (tolerance: -0.005" to 0.005"). It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met for industrial use.