S-90298A735 3/8"-16 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Precise component alignment ensured by the 6" shoulder with tight length tolerances (±0.005"), reducing assembly errors and improving machine performance.
• High load-bearing capability from 70,000 psi tensile strength and 35,000 psi shear strength, providing reliable fastening under stress.
• Secure, high-precision threading with Class 3A UNC fit for superior engagement and vibration resistance in dynamic applications.
• Easy installation and removal using the 1/4" hex drive and knurled head, allowing for efficient maintenance with standard tools.
• Compliance with industry standards including ASME B18.3, ensuring consistent quality and interchangeability in engineering designs.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements for safe use.

Professional Applications & Engineering Value

This stainless steel shoulder screw is engineered to address critical alignment and durability challenges in precision industrial applications. The 6" shoulder length with minimal tolerance variations provides a stable bearing surface for rotating parts like gears, pulleys, and linkages, minimizing wear and misalignment. Made from 18-8 stainless steel, it offers excellent resistance to rust and corrosion, making it suitable for machinery in moist or chemical-exposed settings. The Class 3A UNC thread ensures a tight, reliable fit that withstands vibrations, while the socket head with knurling allows for quick, tool-friendly adjustments. Ideal for use in assembly jigs, conveyor systems, and automation equipment, this screw enhances operational reliability and reduces maintenance downtime.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, with a 3/8"-16 UNC Class 3A thread for high precision and a shoulder diameter tolerance of -0.004" to -0.002". The 6" shoulder length maintains a tight tolerance of -0.005" to 0.005" to ensure consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental standards for industrial use.