S-97345A176 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 offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under heavy loads.
• Precise Class 3A thread fit ensures secure, vibration-resistant assemblies with minimal backlash in critical applications.
• Easy installation and removal with a 5/64" hex socket drive and knurled head for improved grip and torque application.
• Accurate shoulder positioning with a 13/16" shoulder length and tight diameter tolerance for consistent component alignment.
• Robust durability backed by Rockwell B79 hardness, resisting wear and deformation in demanding industrial use.
• Global compliance assurance meeting RoHS 3 and REACH regulations for safe, sustainable manufacturing and supply.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision assembly and machinery. The 4-40 UNC coarse thread with Class 3A fit provides exceptional holding power and vibration resistance, reducing maintenance needs in dynamic systems. Its corrosion-resistant material is vital for applications exposed to moisture, chemicals, or extreme temperatures, such as in marine, chemical processing, or food-grade equipment. The knurled socket head and hex drive facilitate quick, secure fastening in confined spaces, while the precisely machined shoulder acts as a reliable pivot or spacer in linkages, bearings, and rotating assemblies. This combination ensures long-term reliability, minimizes downtime, and supports efficient production workflows.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A precision fit for tight tolerances. Key dimensional specifications include a thread size of 4-40, shoulder diameter of 1/8" (tolerance: -0.004" to -0.002"), and shoulder length of 13/16" (tolerance: -0.005" to 0.005"). It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental safety and regulatory adherence for industrial components.