S-91829A519 4-40 MS51575-5, NASM51575 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 1/8" shoulder diameter and 3/8" shoulder length with tight tolerances for secure assembly.
• High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for demanding mechanical applications.
• Reliable thread engagement with Class 2A fit and UNC coarse threads, providing easy assembly and vibration resistance.
• Durable socket head design allows for high torque application and secure drive in confined spaces.
• Compliance with industry standards including MS51575-5, ensuring consistent quality and interchangeability.
• Environmental regulation adherence with RoHS 3 and REACH compliance 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, enhanced by a passivated finish, provides excellent resistance to corrosion and oxidation, making it ideal for applications in electronics, aerospace, and automotive industries where environmental factors are a concern. The 1/8" shoulder diameter and 3/8" shoulder length ensure accurate positioning of components like gears, bearings, and pulleys, reducing wear and misalignment. With a Class 2A thread fit and coarse thread spacing, it offers quick installation and reliable performance in high-vibration settings, while the socket head allows for efficient tightening in tight spaces. This screw is a trusted solution for engineers seeking to enhance assembly precision and longevity in heavy-duty fastening applications.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a shoulder diameter of 1/8" with tolerance from -0.001" to 0" and shoulder length of 3/8" with tolerance from 0" to 0.002". Threads adhere to UNC standards with a Class 2A fit for consistent performance. It meets MS51575-5 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industry acceptance.