S-94035A519 4-40 MS51576-5, NASM51576 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel and passivated finish, ideal for harsh or humid industrial environments.
• Precise alignment and secure component location due to the controlled 1/8" shoulder diameter with a tight tolerance of -0.001" to 0".
• High-strength performance offering 70,000 psi tensile strength and Rockwell B55 hardness for demanding mechanical applications.
• Reliable and consistent threading with a 4-40 UNC coarse thread and Class 2A fit, ensuring easy assembly and vibration resistance.
• Secure and flush installation enabled by the socket head with a 5/64" hex drive, suitable for confined spaces.
• Extended service life and durability from the precisely machined shoulder and smooth head texture, reducing wear on mating parts.
• Compliance with stringent industry standards including MS51576-5, RoHS 3, and REACH, guaranteeing safety and regulatory acceptance.

Professional Applications & Engineering Value

This precision shoulder screw is engineered to solve critical alignment and fastening challenges in industrial applications. The 1/8" shoulder diameter with its minimal tolerance provides an exact pivot point or bearing surface, preventing component misalignment in assemblies like machinery linkages, electronic enclosures, and precision instruments. Manufactured from 18-8 Stainless Steel and featuring a passivated finish, it resists corrosion from chemicals and moisture, ensuring long-term reliability. The 4-40 UNC coarse thread and Class 2A fit allow for quick, secure installation with standard tools, while the socket head design offers a low-profile solution for space-constrained environments. This combination of high tensile strength and precise dimensions makes it an essential component for maintaining operational integrity in automation, aerospace, and medical equipment.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 2A thread fit for consistent engagement and a shoulder diameter tolerance of -0.001" to 0". It conforms to MS51576-5 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial use.