S-97345A711 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 environments and extended service life.
• Exceptional mechanical strength offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for high-stress applications.
• Precise alignment and pivot function enabled by the 3" shoulder with tight diameter and length tolerances for reliable assembly.
• Secure and durable fastening with Class 3A thread fit and coarse UNC thread spacing, ensuring vibration resistance and easy installation.
• Easy installation and removal using the 1/4" hex drive socket head with knurled texture for improved grip and torque application.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality and environmental safety.
• High hardness rating of Rockwell B79, providing excellent wear resistance and durability under repetitive use.

Professional Applications & Engineering Value

This 316 Stainless Steel shoulder screw is engineered to address critical challenges in industrial applications where precision, strength, and corrosion resistance are paramount. The 3" shoulder length with controlled tolerances ensures accurate component alignment, reducing wear and misalignment in machinery, pivoting mechanisms, and rotating assemblies. The Class 3A thread fit and coarse UNC thread provide reliable, vibration-resistant fastening, essential for equipment subjected to dynamic loads. The hex drive socket head with knurling allows for efficient installation in confined spaces, while the high tensile strength and Rockwell B79 hardness ensure long-term performance in demanding environments such as automotive, aerospace, and manufacturing systems.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC thread with Class 3A fit for precise engagement. The shoulder diameter is 1/2" with a tolerance of -0.004" to -0.002", and the shoulder length is 3" with a tolerance of -0.005" to 0.005". It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safety and regulatory adherence for global industrial use.