S-90337A311 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.
• Precise component alignment enabled by the exact 1/8" shoulder diameter with tight tolerance for reliable assembly.
• High tensile strength of 70,000 psi ensures secure fastening under heavy loads and vibration.
• Easy installation and removal with hex socket drive and low-profile head design for space-constrained applications.
• Consistent thread engagement thanks to Class 2A UNC coarse threads for quick assembly and reduced cross-threading risk.
• Durable construction with Rockwell B55 hardness providing excellent wear resistance and mechanical stability.
• Compliance with environmental regulations including RoHS 3 and REACH for safe, sustainable use in global markets.

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 material, combined with a passivated finish, offers exceptional resistance to corrosion and oxidation, making it ideal for applications in electronics, machinery, and automotive systems where exposure to moisture or chemicals is common. The precisely machined 1/8" shoulder diameter and 7/16" shoulder length ensure accurate positioning of components like gears, bearings, and linkages, reducing wear and improving operational efficiency. With a low socket head profile and hex drive, it allows for easy access in tight spaces, streamlining maintenance and assembly processes while maintaining high tensile strength for demanding industrial environments.

Specification Summary & Compliance

This shoulder screw features a Class 2A thread fit with UNC coarse threads for standard compatibility and ease of use. Dimensions include a shoulder diameter of 1/8" with a tolerance of -0.001" to 0", and a shoulder length of 7/16" with a tolerance of 0" to 0.002" for precise applications. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and adherence to international standards for industrial fasteners.