S-97345A105 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh chemical or marine environments.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable load-bearing applications.
• Precise component alignment ensured by the Class 3A thread fit and standard shoulder fit, reducing assembly errors.
• Secure and easy installation with a 5/64" hex socket drive and knurled head for improved grip and torque application.
• Durable and long-lasting performance backed by a Rockwell B79 hardness rating, resisting wear and deformation.
• Broad compatibility with 4-40 UNC coarse threading and right-hand direction, fitting standard industrial components.
• Compliance with global regulations including RoHS 3 and REACH, ensuring safe and sustainable use in various markets.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision assembly and corrosive settings. Its 3/4" shoulder length provides stable positioning for rotating parts like bearings, pulleys, and gears, minimizing misalignment and vibration in machinery. The Class 3A thread fit and UNC coarse threading ensure tight, reliable fastening in high-stress applications, from automotive systems to electronic enclosures. Made from corrosion-resistant 316 stainless steel, it withstands exposure to chemicals, moisture, and extreme temperatures, reducing maintenance costs and downtime in industries such as aerospace, medical devices, and marine equipment. The combination of a socket head with hex drive and knurled texture allows for efficient installation in confined spaces, enhancing productivity on the assembly line.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A precision fit for tight tolerances. Key dimensions include a thread size of 4-40, shoulder diameter of 1/8" (tolerance: -0.004" to -0.002"), and shoulder length of 3/4" (tolerance: -0.005" to 0.005"). It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for global industrial use.