S-8077A347 3/8"-24 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and chemical exposure.
• Enhanced durability and wear resistance from the black oxide finish, providing added protection against rust and reducing galling.
• Precise alignment and smooth rotation ensured by the 3" shoulder length with tight tolerances, minimizing component wear and vibration.
• High-strength performance with 70,000 psi tensile strength and 35,000 psi shear strength, reliably handling heavy dynamic loads.
• Secure, non-slip installation thanks to the knurled socket head and 1/4" hex drive, allowing for high torque application without stripping.
• Accurate and reliable fastening with Class 3A UNF fine threads, ensuring a tight, secure fit in high-vibration applications.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing safety and regulatory acceptance.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery and assembly. The 3" shoulder length provides a stable bearing surface for rotating components like gears, pulleys, and linkages, reducing misalignment and eccentric wear. The Class 3A UNF fine thread offers superior resistance to loosening under vibration, making it ideal for automotive, aerospace, and heavy equipment applications. Combined with a black oxide finish, it delivers excellent corrosion resistance in moist or chemically aggressive environments, extending service life and reducing maintenance downtime. The knurled socket head ensures a firm grip during installation, facilitating efficient assembly in confined spaces while maintaining high tensile and shear strength for demanding mechanical fastening tasks.

Specification Summary & Compliance

This shoulder screw features a 3/8"-24 UNF thread with Class 3A fit for high precision, a shoulder diameter of 1/2" with tolerance of -0.004" to -0.002", and shoulder length of 3" with tolerance of -0.005" to 0.005". It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring it is free from hazardous substances and suitable for global industrial use.