S-94035A137 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for long-lasting performance in harsh environments
• Precise alignment and positioning ensured by the smooth, accurately machined 1/8" shoulder with tight diameter and length tolerances
• High-strength reliability with 70,000 psi tensile strength and Rockwell B55 hardness for demanding mechanical applications
• Secure and efficient installation using the standard hex socket drive (5/64") for reliable torque transfer and reduced stripping risk
• Broad compatibility with UNC coarse threading (4-40, Class 2A fit) for easy integration into standard industrial assemblies
• Environmental and regulatory compliance meeting RoHS 3 and REACH standards for safe, sustainable use in global markets
• Consistent right-hand threading for straightforward assembly and disassembly in high-volume production settings

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical alignment challenges in precision assemblies. The 1/8" shoulder diameter with minimal tolerances provides a stable bearing surface, preventing component misalignment and reducing wear in rotating mechanisms. Manufactured from 18-8 stainless steel with a passivated finish, it resists oxidation and chemical exposure, making it ideal for electronics, automotive, and medical equipment where corrosion can compromise performance. The socket head design with hex drive allows for compact installation in confined spaces, while the 70,000 psi tensile strength ensures durability under dynamic loads. These features collectively enhance assembly accuracy, minimize maintenance, and extend service life in industrial and mechanical applications.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent engagement. The shoulder maintains precise dimensions: diameter of 1/8" (tolerance: -0.001" to 0") and length of 11/16" (tolerance: 0" to 0.002"). It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material transparency.