S-90318A501 8-32 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh or chemical-exposed environments
• Exceptional mechanical strength offering 70,000 psi tensile strength and 35,000 psi shear strength for reliable load-bearing applications
• Precise alignment and positioning ensured by the precisely fitted shoulder with controlled diameter and length tolerances
• Space-saving ultra-low socket head with hex drive allows for tight installations and reduced protrusion in compact assemblies
• Consistent and reliable threading with Class 2A UNC coarse threads for easy assembly and secure fastening
• Enhanced durability and wear resistance from Rockwell B70 hardness, extending service life in high-cycle applications
• Compliance with global environmental standards including RoHS 3 and REACH, ensuring safe use in regulated industries

Professional Applications & Engineering Value

This precision shoulder screw is engineered to address critical alignment and stability challenges in industrial machinery, automation systems, and precision instruments. The 316 stainless steel material provides excellent resistance to corrosion and oxidation, making it suitable for demanding environments such as marine, chemical processing, and food-grade applications. The ultra-low socket head design with a hex drive allows for low-clearance installations while maintaining high torque transmission. The precisely machined shoulder with tight diameter and length tolerances ensures accurate component positioning, reducing wear and misalignment in rotating assemblies, pivoting mechanisms, and guide pins. Combined with UNC coarse threads and Class 2A fit, this screw delivers reliable performance in high-vibration settings, offering engineers a robust solution for maintaining operational integrity and reducing maintenance downtime.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent engagement and ease of assembly. Key dimensional specifications include a shoulder diameter of 3/16" with a tolerance of -0.001" to 0", and a shoulder length of 1/8" with a tolerance of 0" to 0.002" for precise fitment. The product is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for use in regulated industrial and commercial applications.