S-97345A570 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 including chemical and marine applications.
• Exceptional mechanical strength offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable performance under high stress.
• Precise thread engagement with Class 3A fit and UNC coarse threads, ensuring secure fastening and vibration resistance in demanding assemblies.
• Enhanced grip and torque application from the knurled hex socket head, allowing for easy installation and removal with standard tools.
• Accurate alignment and pivot function provided by the 3/8" shoulder diameter with tight tolerances, reducing wear and maintaining component positioning.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety, quality, and environmental responsibility.
• Durable and long-lasting performance with Rockwell B79 hardness, resisting deformation and extending service life in repetitive use scenarios.

Professional Applications & Engineering Value

This 5/16"-18 UNC shoulder screw in 316 stainless steel is engineered to address critical industrial challenges, such as misalignment and corrosion in machinery. The hex socket head with knurling ensures secure tool engagement, reducing slippage during high-torque applications. Its Class 3A thread fit and coarse UNC thread design provide excellent vibration resistance, making it ideal for precision assemblies in automotive, aerospace, and manufacturing equipment. The 3/8" shoulder diameter acts as a reliable pivot or spacer, minimizing friction and wear in rotating parts. By combining robust materials and precise dimensions, this screw enhances equipment reliability, reduces maintenance downtime, and supports efficient production workflows in demanding environments.

Specification Summary & Compliance

This shoulder screw features precise dimensional tolerances, including a Class 3A thread fit for superior engagement and a shoulder diameter tolerance of -0.004" to -0.002". It adheres to ASME B18.3 specifications for consistent quality and performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, it ensures environmental safety and regulatory acceptance in global markets.