S-90337A312 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction and passivated finish, ensuring long-term reliability in harsh environments.
• Precise component alignment thanks to the exact 1/2" shoulder with tight diameter and length tolerances, minimizing assembly play.
• High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding mechanical applications.
• Secure, low-profile installation using a 5/64" hex drive in the low socket head, ideal for confined spaces.
• Reliable thread engagement with Class 2A fit and coarse UNC 4-40 threads for quick assembly and vibration resistance.
• Compliance with global regulations, including RoHS 3 and REACH, for safe use in international industrial markets.
• Optimized for right-hand, coarse-thread applications ensuring compatibility with standard industrial equipment.

Professional Applications & Engineering Value

This 4-40 UNC low profile socket head shoulder screw is engineered to address critical alignment and space constraints in precision assemblies. The 18-8 Stainless Steel material, combined with a passivated finish, provides excellent resistance to corrosion and wear, making it suitable for machinery, electronics, and automotive components exposed to moisture or chemicals. The 1/2" shoulder length with precise tolerances acts as a reliable pivot or spacer, reducing misalignment and bearing surface wear. Its low profile socket head and 5/64" hex drive allow for secure tightening in tight spaces, enhancing assembly efficiency and reducing the risk of stripping. Ideal for use in jigs, fixtures, and rotating mechanisms, this screw delivers consistent performance where dimensional accuracy and durability are paramount.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent, reliable fastening. Dimensions include a shoulder diameter of 1/8" (tolerance: -0.001" to 0") and shoulder length of 1/2" (tolerance: 0" to 0.002"), ensuring precise assembly. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming its suitability for regulated industrial applications without hazardous substances.