S-97345A108 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and extended service life
• High mechanical strength with 70,000 psi tensile and 35,000 psi shear strength for reliable performance under heavy loads
• Precise assembly and alignment enabled by the standard shoulder fit and Class 3A thread tolerance
• Secure, non-slip fastening thanks to the knurled head texture and 5/64" hex socket drive
• Broad compatibility with 4-40 UNC coarse threads and right-hand direction for common industrial applications
• Enhanced durability from Rockwell B79 hardness, resisting wear and deformation
• Regulatory compliance with RoHS 3 and REACH, ensuring environmental and safety standards are met

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision assemblies, such as maintaining alignment in rotating parts or providing a durable pivot point. The UNC coarse thread and Class 3A fit ensure quick, secure installation with minimal risk of cross-threading, reducing assembly time and improving reliability. Its knurled head and hex drive offer excellent grip for torque application, even in confined spaces. Ideal for machinery, automotive, and electronics, this screw's high tensile and shear strength supports demanding applications where vibration resistance and long-term performance are paramount, while the corrosion-resistant material suits wet or chemical-exposed environments.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for precise engagement. Dimensions include a 0.25" head diameter, 5/32" thread length, and 11/32" shoulder length with tight tolerances (e.g., shoulder diameter tolerance of -0.004" to -0.002"). It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free of hazardous substances and suitable for global industrial use.