S-97768A329 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Durability: Crafted from 18-8 Stainless Steel with a Black Oxide finish for superior corrosion resistance, ensuring long-lasting performance in harsh industrial environments.
• High Tensile & Shear Strength: Withstands demanding applications thanks to a 70,000 PSI tensile strength and 35,000 PSI minimum shear strength, providing reliable and secure fastening.
• Precision Thread Fit: Features a Class 3A thread fit for a tighter, more secure assembly with reduced risk of loosening under vibration or load.
• Optimized Shoulder Design: The 2-1/4" shoulder length with precise tolerances acts as a pivot, spacer, or bearing surface, eliminating the need for additional components.
• Secure and Easy Installation: The hex socket (5/32" drive) and knurled head provide excellent grip and torque transmission, facilitating quick and stable installation.
• Broad Industrial Compliance: Manufactured to meet ASME B18.3 specifications and is RoHS 3 & REACH compliant, ensuring quality and environmental safety standards are met.
• Coarse Thread Advantage: The UNC coarse thread allows for faster assembly and better performance in materials with lower shear strength.

Professional Applications & Engineering Value

This 1/4"-20 UNC shoulder screw is engineered to solve critical alignment and load-bearing challenges in industrial applications. The precision-machined shoulder with a diameter of 5/16" serves as a reliable datum for locating parts like gears, pulleys, and linkages, maintaining exact positioning and reducing wear. The 18-8 Stainless Steel construction and Black Oxide finish provide excellent resistance to rust and corrosion, making it ideal for machinery operating in demanding conditions. Its high tensile and shear strength ensures integrity under dynamic loads, while the Class 3A thread fit guarantees a secure, vibration-resistant connection. This screw is a fundamental component for precision assemblies in automation, automotive, and heavy equipment, where reliability and dimensional accuracy are paramount.

Specification Summary & Compliance

This shoulder screw adheres to strict dimensional standards, featuring a Class 3A thread fit for superior engagement and a shoulder diameter tolerance of -0.004" to -0.002" for precise fit. It conforms to the ASME B18.3 standard for socket head shoulder screws and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for various industrial uses.