S-8077A589 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and Black Oxide finish, ideal for harsh industrial environments.
• Precise alignment and reduced wear thanks to the Class 3A thread fit and standard shoulder fit, ensuring reliable assembly in high-tolerance applications.
• High mechanical strength with 70,000 psi tensile strength and 35,000 psi shear strength, providing durability under heavy loads.
• Easy installation and removal with a hex drive socket head and knurled texture, offering secure grip and efficient tool engagement.
• Consistent performance in precision machinery due to the UNC coarse thread and right-hand thread direction, facilitating quick assembly.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.
• Enhanced stability from the Rockwell B79 hardness, maintaining integrity in repetitive motion applications.

Professional Applications & Engineering Value

This 5/16"-18 UNC shoulder screw is engineered to address common industrial challenges, such as misalignment and corrosion-induced failure. Made from 316 Stainless Steel with a Black Oxide finish, it resists harsh chemicals and moisture, extending service life in applications like precision machinery, automotive assemblies, and electronic enclosures. The Class 3A thread fit and coarse UNC thread ensure tight tolerances and quick fastening, reducing assembly time and maintenance costs. Its socket head with hex drive and knurled texture allows for secure tool engagement in confined spaces, while the shoulder design provides stable pivoting or spacing in rotating parts. Ideal for B2B sectors requiring reliable, corrosion-resistant screws that meet rigorous ASME B18.3 standards, this component enhances operational efficiency and minimizes downtime.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional tolerances, including a Class 3A thread fit for high accuracy, UNC coarse threads with a size of 5/16"-18, and shoulder diameter tolerance of -0.004" to -0.002". It conforms to ASME B18.3 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial use.