S-90298A828 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh industrial environments
• Precise alignment and secure positioning thanks to the 2" shoulder with tight diameter tolerance of -0.001" to 0.001"
• High-strength, wear-resistant performance ensured by Rockwell B55 hardness for demanding applications
• Reliable, vibration-resistant threading with Class 3A fit and coarse 1/2"-13 UNC thread for quick assembly
• Easy installation and removal using the knurled hex socket head, preventing tool slippage
• Extended service life from durable materials and compliant manufacturing per ASME B18.3 standards
• Safe for regulated industries with RoHS 3 and REACH compliance, meeting environmental and safety requirements

Professional Applications & Engineering Value

This high-precision shoulder screw is engineered to address common industrial challenges, such as component misalignment and fastener failure under stress. The 18-8 stainless steel construction with a passivated finish provides excellent resistance to corrosion and oxidation, making it suitable for machinery, automotive, and electronics applications where exposure to moisture or chemicals is a concern. The 2" shoulder length with minimal tolerances ensures accurate spacing and rotational control in assemblies, reducing wear on connected parts. Combined with a Class 3A thread fit and coarse UNC threading, it offers robust holding power and quick installation, minimizing downtime in production lines. The knurled hex socket head enhances grip for efficient torque application, supporting maintenance and repair workflows in industrial shoulder screw uses.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, ensuring dimensional accuracy with a Class 3A thread fit for tight tolerances. Key measurements include a thread size of 1/2"-13 UNC, thread length of 3/4", shoulder diameter of 5/8" (tolerance: -0.001" to 0.001"), and shoulder length of 2" (tolerance: -0.005" to 0.005"). It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing safety and environmental standards for global industrial use.