S-97345A609 1/4"-28 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 with 70,000 psi tensile strength and 35,000 psi shear strength for reliable performance in demanding applications.
• Precise assembly and alignment ensured by the 3/8" shoulder diameter with tight tolerances and a long 1 3/4" shoulder length.
• Secure, high-precision threading with a Class 3A fit and 1/4"-28 UNF fine thread for vibration resistance and superior clamp load.
• Easy installation and removal using the 3/16" hex socket drive and knurled head for improved grip and torque application.
• Long-term durability supported by Rockwell B79 hardness, providing excellent wear resistance and material integrity.
• Guaranteed compliance and safety meeting ASME B18.3 specifications and environmental standards like RoHS 3 and REACH.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery and industrial assemblies. Its corrosion-resistant material and high tensile strength make it suitable for applications in marine, chemical processing, and food equipment, where exposure to moisture and aggressive substances is common. The fine UNF thread and Class 3A fit ensure minimal backlash and secure fastening in dynamic or vibrating systems, reducing maintenance needs. The knurled head and hex socket drive facilitate quick, tool-friendly installation, while the precisely machined shoulder provides stable alignment for rotating parts like bearings and pulleys. This combination of features enhances operational reliability, extends service life, and supports efficient B2B procurement for OEMs and MRO professionals.

Specification Summary & Compliance

This shoulder screw features a 1/4"-28 UNF fine thread with a Class 3A thread fit for high precision. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 1 3/4" with a tolerance of -0.005" to 0.005". It is manufactured in compliance with ASME B18.3 standards and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and consistency for industrial use.