S-8077A652 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh industrial 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 3/4" shoulder with controlled diameter and length tolerances.
• Reliable, vibration-resistant assembly ensured by the Class 3A thread fit and coarse 1/4"-20 UNC thread for quick installation.
• Enhanced wear resistance and reduced galling from the black oxide finish, providing a durable protective layer.
• Secure, non-slip fastening with the knurled socket head and 3/16" hex drive for high-torque applications.
• Guaranteed quality and safety compliance meeting ASME B18.3, RoHS 3, and REACH standards for regulated industries.

Professional Applications & Engineering Value

This 316 Stainless Steel shoulder screw is engineered to address critical challenges in precision machinery and industrial equipment. The 1/4"-20 UNC coarse thread and Class 3A thread fit provide a robust, vibration-resistant connection that maintains integrity under dynamic loads, reducing the risk of loosening in automated systems. The precisely machined 3/4" shoulder acts as a reliable spacer or pivot point, ensuring accurate component alignment in assemblies like rotating shafts, linkages, and bearing mounts. The black oxide finish on the 316 stainless steel substrate offers an added layer of corrosion protection, making it suitable for demanding environments, including marine, chemical processing, and outdoor applications. Its socket head with knurling and hex drive allows for efficient installation in confined spaces, streamlining maintenance and assembly processes while delivering consistent performance.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC coarse 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 3/4" with a tolerance of -0.005" to 0.005". It is manufactured in compliance with ASME B18.3 specifications and is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to international safety and environmental standards.