S-91273A115 5-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under high-stress conditions.
• Precise alignment and spacing ensured by the 1/8" diameter shoulder with controlled tolerances, reducing component wear and misalignment.
• Secure and efficient installation via the 5/64" hex socket drive and knurled head, providing excellent grip and preventing tool slippage.
• Wide compatibility and easy assembly with 5-40 UNC coarse right-hand threads and Class 2A fit, ensuring quick engagement and interchangeability.
• Enhanced durability from Rockwell B55 hardness, maintaining thread integrity and shoulder dimensions through repeated use.
• Compliance with strict environmental regulations, being RoHS 3 and REACH compliant for use in regulated markets and applications.

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw is engineered to address critical alignment and fastening challenges in precision assemblies. The 1/8" shoulder diameter and 3/8" shoulder length provide a stable pivot or bearing surface, preventing axial movement and reducing wear in rotating components like gears, linkages, and pivots. The 5-40 UNC coarse thread and Class 2A thread fit ensure rapid assembly and reliable holding power, while the hex socket drive and knurled head allow for secure torque application in confined spaces. Ideal for industrial machinery, automotive systems, and electronic enclosures, this screw offers a robust shoulder fastening solution that maintains precision under dynamic loads and corrosive conditions.

Specification Summary & Compliance

This shoulder screw features a 1/8" shoulder diameter with a tolerance of -0.004" to -0.002" and a 3/8" shoulder length with a tolerance of -0.005" to 0.005". Thread specifications include 5-40 UNC coarse threads with a Class 2A thread fit for standard interchangeability. Manufactured from 18-8 stainless steel with a hardness of Rockwell B55, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability.