S-97345A705 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 chemical exposure.
• Exceptional mechanical strength offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable performance under high stress.
• Precise alignment and pivot function provided by the 2 1/2" shoulder with tight diameter and length tolerances for accurate component positioning.
• High-reliability thread engagement with Class 3A thread fit and 5/16"-18 UNC coarse thread design ensuring secure fastening and vibration resistance.
• Easy installation and removal via the 1/4" hex socket drive and knurled head for improved grip and torque application.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring quality, safety, and environmental responsibility.
• Durable and wear-resistant with Rockwell B79 hardness, maintaining integrity in repetitive assembly and disassembly cycles.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and industrial equipment. The 5/16"-18 UNC coarse thread and Class 3A thread fit provide excellent resistance to loosening under vibration, making it ideal for dynamic applications like robotics, conveyor systems, and assembly jigs. The 2 1/2" shoulder length with tight tolerances ensures precise alignment of moving parts, reducing wear and misalignment issues. The knurled head and hex socket drive facilitate quick installation in confined spaces, while the corrosion-resistant 316 stainless steel material guarantees long-term performance in humid, marine, or chemically aggressive environments, minimizing maintenance and replacement costs.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC thread with Class 3A fit and coarse thread spacing for secure fastening. The shoulder diameter is 1/2" with a tolerance of -0.004" to -0.002", and the shoulder length is 2 1/2" with a tolerance of -0.005" to 0.005" for high precision. It complies with ASME B18.3 specifications and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting stringent environmental and safety standards for industrial use.