S-97345A690 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel material, ideal for harsh environments and extended service life.
• High-strength performance offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding applications.
• Precise alignment and smooth rotation ensured by the Class 3A thread fit and standard shoulder fit, reducing wear and assembly time.
• Secure and easy installation with a 1/4" hex drive and knurled head, providing excellent grip and torque transmission.
• Reliable dimensional stability from tight tolerances on shoulder diameter and length, ensuring consistent part positioning.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing safety and regulatory adherence.
• Versatile coarse UNC thread (5/16"-18) for quick assembly and robust holding power in various industrial settings.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and corrosive environments. Its Class 3A thread fit and standard shoulder fit provide exact alignment, minimizing misalignment issues and vibration in assemblies like rotating shafts, linkages, and jigs. The knurled head and hex drive design facilitate secure handling and high-torque installation without slippage. With a Rockwell B79 hardness and excellent corrosion resistance, it withstands operational stresses and exposure to chemicals, making it ideal for industrial fasteners in food processing, marine, and chemical equipment where durability and compliance with RoHS 3 and REACH are paramount.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit for superior accuracy, UNC thread type with coarse spacing, and tolerances such as shoulder diameter (-0.004" to -0.002") and length (-0.005" to 0.005"). It meets ASME B18.3 specifications for consistency and reliability, and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity for global industrial use.