S-94035A126 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
• Precise alignment and reduced wear thanks to the accurately machined 1/8" shoulder diameter with tight tolerances
• High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Secure and reliable fastening ensured by the Class 2A thread fit and coarse UNC thread for vibration resistance
• Easy installation in confined spaces with the hex socket head design requiring only a 5/64" drive tool
• Environmental compliance meeting RoHS 3 and REACH standards for safe use in regulated industries
• Consistent dimensional accuracy with right-hand UNC 4-40 threads and standard socket head profile for interchangeability

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to solve critical alignment challenges in precision assemblies. The 1/8" shoulder diameter provides an exact pivot point or bearing surface, eliminating component misalignment and reducing wear in rotating mechanisms. Manufactured from 18-8 stainless steel with a passivated finish, it withstands corrosive environments while maintaining Rockwell B55 hardness for durability. The hex socket head allows high torque application in space-constrained applications, making it ideal for precision instruments, machinery assemblies, and electronic enclosures where 70,000 psi tensile strength ensures reliable performance under dynamic loads.

Specification Summary & Compliance

This shoulder screw features Class 2A thread fit with UNC 4-40 coarse threads and precise shoulder dimensions (diameter tolerance: -0.001" to 0", length tolerance: 0" to 0.002"). Manufactured to standard industrial specifications with right-hand thread direction and standard socket head profile. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.