S-94035A134 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Corrosion Resistance: Passivated 18-8 stainless steel construction ensures long-lasting performance in harsh environments, reducing maintenance and replacement costs.
• High Tensile Strength & Durability: With a tensile strength of 70,000 psi and Rockwell B55 hardness, this screw withstands high-stress applications without failing.
• Precise Alignment & Secure Fit: The 1/8" shoulder diameter with precise fit tolerance provides accurate component positioning and prevents lateral movement.
• Easy Installation & Removal: Hex socket drive (5/64") allows for quick, secure fastening with standard tools, minimizing assembly time.
• Reliable Thread Engagement: UNC coarse threads with Class 2A fit ensure consistent, vibration-resistant connections in various materials.
• Compliance with Environmental Standards: Meets RoHS 3 and REACH regulations, making it suitable for global supply chains and eco-conscious industries.
• Versatile Industrial Application: Right-hand thread and standard socket head profile enable broad use in machinery, electronics, and precision assemblies.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to solve critical alignment and durability challenges in industrial settings. Made from 18-8 stainless steel with a passivated finish, it resists corrosion and oxidation, extending service life in moist or chemical-exposed environments. The 1/8" shoulder diameter and precise tolerance provide a stable pivot or bearing surface, essential for minimizing wear in rotating assemblies like motors, pivots, and linkages. The coarse UNC threads and Class 2A fit ensure quick, secure fastening even in softer materials, reducing the risk of cross-threading. Ideal for precision machinery, automotive components, and electronic enclosures, this screw delivers reliable performance where exact positioning and high strength are non-negotiable, streamlining maintenance and enhancing product longevity.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent engagement and dimensional accuracy. Key specifications include a shoulder diameter of 1/8" (tolerance: -0.001" to 0") and shoulder length of 15/32" (tolerance: 0" to 0.002"), ensuring precise assembly. The manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material restrictions are met for industrial use.