S-97768A363 5/16"-24 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance from 18-8 stainless steel material, ideal for harsh industrial environments and reducing replacement frequency.
• High tensile and shear strength (70,000 psi tensile, 35,000 psi min shear) ensures reliable performance under heavy loads and mechanical stress.
• Precise Class 3A thread fit provides superior assembly accuracy, vibration resistance, and secure fastening in critical applications.
• Enhanced grip and anti-slip handling due to the knurled head texture, facilitating easier installation and removal even in tight spaces.
• Durable black oxide finish offers added corrosion protection and a professional appearance, extending service life.
• Accurate shoulder diameter and length with tight tolerances ensures perfect alignment and smooth rotational movement in pivoting or guiding applications.
• Broad regulatory compliance including ASME B18.3, RoHS 3, and REACH, guaranteeing safety and environmental standards for global supply chains.

Professional Applications & Engineering Value

This 5/16"-24 UNF shoulder screw is engineered to address common industrial challenges such as misalignment, component wear, and fastener failure. The 18-8 stainless steel construction combined with a black oxide finish provides excellent resistance to rust and corrosion, making it suitable for machinery, automotive assemblies, and electronic enclosures exposed to moisture or chemicals. The fine thread and Class 3A fit ensure tight, secure connections that resist loosening under vibration, critical in precision equipment. The knurled socket head allows for easy torque application with standard hex tools, reducing installation time and improving workflow efficiency in automated or manual settings. Its robust shoulder design acts as a reliable pivot or spacer, maintaining precise part alignment and reducing maintenance needs in high-stress applications.

Specification Summary & Compliance

This shoulder screw features a 5/16"-24 UNF fine thread with Class 3A thread fit for high precision, and a shoulder diameter of 3/8" with tolerances from -0.004" to -0.002". The shoulder length is 3/4" with a tolerance of -0.005" to 0.005", ensuring consistent performance. It complies with ASME B18.3 specifications for dimensional accuracy and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting environmental and safety standards for industrial use.