S-8077A614 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 316 stainless steel construction and black oxide finish, ideal for harsh environments and extended service life.
• High mechanical strength and reliability with a tensile strength of 70,000 PSI and shear strength of 35,000 PSI for demanding industrial applications.
• Precise Class 3A thread fit ensures secure, vibration-resistant assemblies and consistent performance in critical joints.
• Secure and easy installation with a hex socket drive and knurled head, providing superior grip and torque application.
• Accurate shoulder dimensions with controlled diameter and length tolerances for precise location and alignment of components.
• Broad regulatory compliance including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental standards are met.
• Coarse UNC thread profile facilitates quick assembly and disassembly, improving maintenance efficiency.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address common industrial challenges such as component misalignment, corrosion-induced failure, and joint loosening under vibration. The black oxide finish enhances surface durability and provides an additional layer of corrosion protection, making it suitable for applications in marine, chemical processing, and outdoor equipment. The Class 3A thread fit and precise shoulder diameter ensure accurate positioning and secure fastening in assemblies like rotating machinery, pivots, and jigs. Its high tensile and shear strength supports heavy-load scenarios, reducing the risk of fastener failure and maintenance downtime. The combination of a knurled head and hex drive allows for efficient installation in confined spaces, streamlining production and repair processes.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC coarse thread with a Class 3A thread fit for high precision. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 1/4" with a tolerance of -0.005" to 0.005". It complies with ASME B18.3 manufacturing specifications and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring adherence to international quality and environmental standards.