S-8077A615 5/16"-18 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 outdoor applications.
• Enhanced durability and wear resistance from the black oxide finish, which also provides a sleek, non-reflective appearance.
• High-strength performance with a tensile strength of 70,000 psi and a minimum shear strength of 35,000 psi for reliable, heavy-duty fastening.
• Precise thread engagement with Class 3A thread fit and coarse UNC threading, ensuring secure, vibration-resistant connections.
• Easy installation and removal using a standard 3/16" hex drive and knurled head for improved grip and torque application.
• Accurate alignment and spacing due to the precisely machined shoulder with tight diameter and length tolerances.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality and environmental safety.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision assembly and machinery. The black oxide finish not only enhances corrosion resistance but also reduces galling and seizing in high-stress applications, such as rotating assemblies and pivoting mechanisms. The coarse 5/16"-18 UNC thread with Class 3A fit ensures quick, reliable fastening in materials where fine threads might strip, while the knurled socket head allows for secure tool engagement, minimizing slippage during torque-intensive operations. Its robust 70,000 psi tensile strength and precisely controlled shoulder dimensions provide stable bearing surfaces for gears, pulleys, and linkages, reducing wear and maintaining alignment in industrial equipment, automotive systems, and automation technology.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit with UNC coarse threading for superior engagement and vibration resistance. Manufacturing adheres to ASME B18.3 specifications, ensuring dimensional accuracy for the shoulder diameter (3/8" with tolerance -0.004" to -0.002") and length (3/4" with tolerance -0.005" to 0.005"). The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and regulated industrial applications.