S-90298A718 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
• Exceptional load-bearing capacity with 70,000 psi tensile strength and Rockwell B55 hardness for demanding industrial applications
• Precise alignment and reduced wear thanks to Class 3A thread fit and tight shoulder diameter tolerance of ±0.001"
• Easy installation and removal with hex drive and knurled head design, providing secure grip and efficient torque transfer
• Reliable performance in high-vibration settings due to coarse UNC threading and right-hand thread direction
• Extended service life with 1-3/4" shoulder length maintaining consistent spacing and reducing component fatigue
• Full regulatory compliance meeting ASME B18.3 standards, RoHS 3, and REACH for global industrial use

Professional Applications & Engineering Value

This precision shoulder screw delivers critical engineering solutions where component alignment, durability, and corrosion resistance are paramount. The 18-8 stainless steel material with passivated finish provides excellent protection against oxidation and chemical exposure, making it ideal for machinery, automation systems, and outdoor equipment. The Class 3A thread fit and UNC coarse thread ensure secure fastening in high-vibration environments, while the 1-3/4" shoulder length maintains precise part spacing in assemblies like rotating shafts, pivots, and guides. With 70,000 psi tensile strength, it withstands heavy loads without deformation, reducing maintenance needs and downtime in industrial operations.

Specification Summary & Compliance

This shoulder screw features 3/8"-16 UNC coarse threads with Class 3A fit for precise engagement, and a shoulder diameter tolerance of -0.001" to 0.001" for accurate alignment. Manufactured in compliance with ASME B18.3 specifications, it ensures dimensional consistency and performance reliability. The fastener is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety standards for industrial components.