S-90337A166 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel and passivated finish for long-lasting performance in harsh environments.
• Enhanced assembly precision through Class 2A thread fit and precisely machined shoulder with tight tolerances for reliable alignment.
• Space-saving low profile socket head allows for compact designs while providing secure hex drive engagement.
• High mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness to withstand demanding loads.
• Streamlined installation using a standard 5/64" hex drive for efficient, tool-compatible fastening.
• Regulatory compliance assurance with RoHS 3 and REACH adherence, meeting international environmental and safety standards.
• Versatile coarse UNC threading ensures quick assembly and disassembly in various industrial applications.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The 18-8 Stainless Steel construction, enhanced by a passivated finish, provides exceptional resistance to oxidation and chemical exposure, making it ideal for electronics, machinery, and automotive components where environmental factors are a concern. The low profile socket head design minimizes protrusion, allowing for sleek, compact device profiles without compromising on drive security. With a precisely machined shoulder diameter of 1/8" and length of 1/4", it ensures accurate positioning of moving parts, reducing wear and improving operational longevity. This screw is a reliable choice for applications demanding high tensile strength and consistent performance under stress, supported by its compliance with major regulatory standards.

Specification Summary & Compliance

This shoulder screw adheres to UNC coarse thread standards with a Class 2A thread fit for consistent engagement and ease of assembly. The shoulder features a diameter of 1/8" (tolerance: -0.001" to 0") and length of 1/4" (tolerance: 0" to 0.002"), ensuring precise component alignment. Manufactured in accordance with inch system measurements, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, guaranteeing environmental safety and material integrity for global supply chains.