S-90969A270 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 140,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Precision Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in dynamic environments.
• Black oxide finish offers enhanced corrosion resistance and a durable, non-reflective surface for extended service life.
• Ultra-low socket head profile with knurled texture allows for easy installation in confined spaces and improved grip during assembly.
• Strict shoulder diameter tolerance (-0.004" to -0.002") ensures accurate alignment and smooth rotation in mating components.
• Alloy steel construction with Rockwell C30 hardness delivers excellent wear resistance and durability under heavy loads.
• Compliance with RoHS 3 and REACH regulations guarantees environmental safety and suitability for global industrial markets.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial machinery. The alloy steel material, combined with a black oxide finish, provides robust resistance to wear and corrosion, making it ideal for high-stress environments like automotive assemblies, precision equipment, and conveyor systems. The 1/4"-20 UNC coarse thread and Class 3A fit ensure secure fastening with minimal backlash, while the precisely toleranced shoulder diameter facilitates accurate positioning of moving parts. Its ultra-low socket head design with a hex drive allows for efficient installation in space-constrained applications, reducing assembly time and improving overall system reliability.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for precise engagement. Key dimensional tolerances include a shoulder diameter of -0.004" to -0.002" and shoulder length of -0.005" to 0.005". Manufactured from alloy steel with a hardness of Rockwell C30 and tensile strength of 140,000 psi, it meets industry standards for durability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety adherence.