S-8077A613 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.
• High tensile and shear strength (70,000 psi tensile, 35,000 psi shear) ensures reliable performance under heavy loads.
• Precision Class 3A thread fit provides consistent, secure fastening with minimal backlash in assemblies.
• Knurled socket head offers enhanced grip and easy installation with standard hex tools.
• Durable shoulder design with precise diameter and length tolerances for accurate component alignment.
• Coarse UNC threads enable quick assembly and disassembly, reducing maintenance time.
• Compliance with ASME B18.3 and environmental regulations (RoHS 3, REACH) guarantees quality and safety.

Professional Applications & Engineering Value

This 5/16"-18 UNC shoulder screw is engineered to address critical alignment and wear issues in industrial applications such as machinery, pivots, and rotating assemblies. The 316 Stainless Steel material and Black Oxide finish provide exceptional resistance to corrosion and oxidation, extending service life in humid or chemical-exposed settings. The socket head with hex drive allows for tight spaces and secure torque application, while the knurled texture prevents slipping during installation. With a Class 3A thread fit and precise shoulder dimensions, it ensures minimal play and consistent performance, reducing downtime and maintenance costs in high-stress environments.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC coarse thread with Class 3A fit for high precision, and shoulder dimensions including a diameter of 3/8" (tolerance: -0.004" to -0.002") and length of 1/2" (tolerance: -0.005" to 0.005"). It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and reliability in industrial use.