S-8077A868 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 industrial environments and chemical exposure.
• Enhanced durability and wear resistance from the black oxide finish, providing a protective layer against abrasion and galling.
• Precise alignment and secure positioning thanks to the Class 3A thread fit and standard shoulder, ensuring minimal play in assemblies.
• High mechanical strength with 70,000 psi tensile and 35,000 psi shear strength, suitable for demanding applications requiring reliable load-bearing capacity.
• Easy installation and removal using a standard 5/32" hex drive and knurled head, offering improved grip and torque application.
• Fine thread design (1/4"-28 UNF) for better adjustment control and vibration resistance in precision machinery.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision assemblies, such as misalignment and component wear. The black oxide finish not only enhances corrosion resistance but also reduces friction during installation, preventing seizing in high-stress environments. With a Class 3A thread fit and fine UNF threads, it provides tight tolerances for applications in robotics, aerospace, and automotive systems where vibration loosening is a concern. The knurled head and hex drive allow for secure tool engagement, streamlining maintenance in confined spaces. Ideal for pivot points, bearing mounts, and linkages, this screw ensures long-term reliability and reduced downtime in industrial settings.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a Class 3A thread fit for superior accuracy, and adheres to ASME B18.3 manufacturing standards. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety. Key tolerances include shoulder diameter (-0.004" to -0.002") and length (-0.005" to 0.005"), supporting consistent performance in high-precision applications.