S-90298A206 6-32 ASME B18.3 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 alignment and secure positioning thanks to the standard shoulder fit and tight diameter tolerance of ±0.001"
• High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing applications
• Consistent thread engagement ensured by Class 3A fit and coarse UNC threads, reducing assembly time and improving joint integrity
• Easy installation and removal with hex socket drive design, allowing for high torque application in confined spaces
• Environmental compliance meeting RoHS 3 and REACH standards, ensuring safe use in regulated industries
• Broad compatibility with ASME B18.3 specifications, guaranteeing interchangeability and reliability in precision assemblies

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw is engineered to solve critical alignment challenges in mechanical assemblies. The 6-32 UNC coarse thread with Class 3A fit provides exceptional thread engagement, minimizing the risk of cross-threading in high-volume production. The passivated finish enhances durability against oxidation and chemical exposure, making it suitable for automotive, aerospace, and electronics applications where corrosion resistance is paramount. The precisely machined shoulder—with diameter tolerance of -0.001" to 0.001"—ensures accurate component positioning in pivots, linkages, and rotating mechanisms, reducing wear and maintenance costs. Its socket head and hex drive facilitate secure fastening in space-constrained environments, improving assembly efficiency.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 standards, with Class 3A thread fit for superior precision. Thread specifications include 6-32 UNC coarse thread, 3/16" thread length, and right-hand direction. Shoulder dimensions are tightly controlled: diameter of 5/32" (±0.001" tolerance) and length of 1/8" (±0.005" tolerance). The screw is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and sustainable usage.