S-90298A723 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.
• High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for demanding mechanical applications.
• Precision shoulder alignment with tight tolerances (±0.005" length, ±0.001" diameter) for accurate component positioning and reduced assembly errors.
• Enhanced grip and torque application through the knurled hex socket head design, preventing tool slippage during installation.
• Reliable thread engagement with Class 3A UNC coarse threads, providing secure fastening and vibration resistance.
• Broad regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for safe, industry-approved usage.
• Versatile right-hand threading compatible with standard UNC components, simplifying inventory and assembly processes.

Professional Applications & Engineering Value

This stainless steel shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The 2-3/4" shoulder length with minimal tolerance variations ensures exact positioning in machinery, jigs, and rotating assemblies, eliminating play and misalignment. The 18-8 stainless steel material combined with a passivated finish resists oxidation and chemical exposure, making it ideal for food processing, medical devices, and outdoor equipment. Its Class 3A UNC coarse threads and 70,000 psi tensile strength provide robust fastening under dynamic loads, while the knurled hex socket head allows for high-torque installation without cam-out. These features collectively reduce maintenance cycles and enhance operational safety in industrial fastening applications.

Specification Summary & Compliance

This shoulder screw adheres to Class 3A thread fit per UNC standards, ensuring precise thread engagement. Shoulder dimensions are controlled to -0.001" to 0.001" diameter tolerance and -0.005" to 0.005" length tolerance for consistent performance. Manufacturing and material specifications comply with ASME B18.3, and the product is verified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety regulations.