S-90298A174 3/8"-16 ASME B18.3 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 alignment and smooth rotation thanks to the 1/2" shoulder diameter with tight tolerance (±0.001"), reducing wear on mating components.
• High-strength thread engagement with Class 3A fit and 3/8"-16 UNC coarse threads, providing secure fastening and vibration resistance.
• Easy installation and removal using the 1/4" hex drive and knurled head, allowing for efficient assembly even in confined spaces.
• Consistent dimensional accuracy as per ASME B18.3 standards, ensuring interchangeability and reliable performance in industrial applications.
• Enhanced durability from the passivated surface, which increases corrosion resistance without compromising the material's mechanical properties.
• Compliance with global regulations including RoHS 3 and REACH, making it suitable for international supply chains and sensitive industries.

Professional Applications & Engineering Value

This 3/8"-16 UNC shoulder screw is engineered to address critical alignment and wear issues in precision machinery, such as rotating assemblies, pivoting joints, and guide mechanisms. The 18-8 stainless steel material, combined with a passivated finish, offers excellent resistance to corrosion and oxidation, extending service life in demanding environments like automotive, aerospace, and food processing equipment. The 1/2" shoulder diameter with minimal tolerance ensures precise locating and reduced friction, while the Class 3A thread fit and coarse UNC threads provide robust, vibration-resistant connections. Ideal for applications requiring repeated disassembly, the hex drive and knurled head facilitate quick maintenance without slippage, enhancing operational efficiency and reducing downtime.

Specification Summary & Compliance

This shoulder screw features a 3/8"-16 UNC thread with Class 3A fit for high precision, a shoulder diameter of 1/2" with tolerance of -0.001" to 0.001", and shoulder length of 5/16" with tolerance of -0.005" to 0.005". It is manufactured in compliance with ASME B18.3 standards and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) requirements, ensuring environmental safety and regulatory adherence for global industrial use.