S-91273A118 5-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and reducing replacement frequency.
• Enhanced precision alignment thanks to the 3/4" shoulder length, providing a stable pivot point for rotating components.
• High mechanical strength with 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable performance under load.
• Secure and efficient installation via the hex socket drive and knurled head, preventing tool slippage and enabling high torque application.
• Consistent thread engagement with Class 2A UNC coarse threads, ensuring easy assembly and vibration resistance in industrial settings.
• Compliance with environmental regulations including RoHS 3 and REACH, making it suitable for global supply chains and sensitive applications.
• Durable wear resistance from Rockwell B55 hardness, maintaining dimensional stability and longevity in high-use scenarios.

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, such as misalignment and component wear. The 3/4" shoulder length acts as a precise axle or spacer, ensuring accurate positioning in assemblies like rotating shafts, linkages, and bearing supports. Its UNC coarse thread and Class 2A fit facilitate quick, reliable fastening in industrial applications, reducing assembly time while resisting loosening from vibrations. The knurled head and hex drive design enhance grip and torque transmission, preventing damage during installation. Made from corrosion-resistant 18-8 stainless steel, it excels in environments exposed to moisture or chemicals, minimizing downtime and maintenance costs in sectors like automation, automotive, and electronics manufacturing.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 2A thread fit for consistent tolerance and a shoulder diameter tolerance of -0.004" to -0.002". It conforms to UNC thread specifications with a 5-40 coarse thread and right-hand direction. 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 international industrial use.