S-90337A383 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments
• Precise component alignment ensured by a 1" shoulder with tight tolerances (±0.002") for stable assembly
• High-strength performance offering 70,000 psi tensile strength and Rockwell B55 hardness for durable, reliable fastening
• Space-saving low-profile socket head with 5/64" hex drive for easy installation in confined areas
• Consistent thread engagement with Class 2A UNC coarse threads for quick assembly and reduced cross-threading risk
• Environmental compliance meeting RoHS 3 and REACH standards for safe, sustainable industrial use
• Right-hand thread design for standard tool compatibility and straightforward installation

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical alignment challenges in precision machinery, automation systems, and electronic assemblies. The 1" shoulder length with minimal tolerance variation provides a stable pivot or guide for rotating parts, reducing wear and misalignment in high-cycle applications. Made from 18-8 Stainless Steel, it resists corrosion in humid or chemical-exposed settings, while the low profile socket head allows flush mounting where clearance is limited. The Class 2A thread fit and coarse UNC thread ensure rapid installation with standard hex tools, streamlining assembly in production lines and maintenance operations.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent engagement. The shoulder diameter and length maintain precise tolerances (e.g., shoulder length: 0" to 0.002"), supporting accurate alignment. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety for industrial applications.