S-91829A535 10-32 MS51575-20, NASM51575 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
• Precise component alignment ensured by the smooth shoulder with tight diameter tolerance (-0.001" to 0") and length tolerance (0" to 0.002").
• High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing applications.
• Secure, vibration-resistant fastening from the 10-32 UNF fine thread with Class 2A fit, minimizing loosening in dynamic assemblies.
• Easy installation and removal using standard socket or slotted drive tools, reducing assembly time and tooling costs.
• Compliance with stringent standards including MS51575-20, RoHS 3, and REACH, ensuring material safety and regulatory acceptance.
• Versatile shoulder design with 3/8" shoulder length providing stable bearing surfaces for pivots, axles, and spacers.

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw is engineered to address critical alignment and durability challenges in precision machinery. The passivated finish enhances corrosion resistance, making it suitable for applications exposed to moisture, chemicals, or outdoor conditions. Its 10-32 UNF fine thread and Class 2A thread fit provide secure fastening with minimal backlash, essential for high-vibration environments like robotics, automotive assemblies, and aerospace components. The precisely machined shoulder acts as a reliable datum for rotating parts, ensuring consistent performance in jigs, fixtures, and bearing mounts. By combining high tensile strength with regulatory compliance, this fastener reduces maintenance needs and enhances the longevity of industrial equipment.

Specification Summary & Compliance

This shoulder screw adheres to Class 2A thread fit tolerances and is manufactured per MS51575-20 specifications. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances. The inch-system dimensions include a thread diameter of 0.19" and a shoulder diameter of 1/4" with tight tolerances for precision assembly.