S-8077A817 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 and 35,000 psi shear strength for reliable performance under high-stress conditions.
• Precise alignment and smooth rotation ensured by the 1-1/4" shoulder with tight diameter tolerance for accurate component positioning.
• Enhanced durability and wear resistance from the black oxide finish and Rockwell B79 hardness, reducing maintenance needs.
• Secure and efficient installation with a knurled socket head and 5/32" hex drive, providing excellent grip and torque application.
• Reliable thread engagement due to Class 3A fit and 1/4"-20 UNC coarse threads, minimizing cross-threading and ensuring consistent fastening.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality and environmental safety for global applications.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial assembly, such as misalignment and corrosion-induced failure. The black oxide finish enhances surface protection, reducing friction and wear in dynamic applications like machinery linkages and rotating assemblies. Its 1/4"-20 UNC coarse threads and Class 3A thread fit provide quick, secure fastening, minimizing installation time and thread damage risks. The precision shoulder diameter and length ensure stable component spacing and alignment, essential for high-tolerance equipment. Ideal for use in automotive, aerospace, and manufacturing sectors, this screw delivers consistent performance in environments demanding high tensile strength and regulatory compliance, streamlining maintenance and boosting operational reliability.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005", ensuring accurate fits. It adheres to ASME B18.3 standards for dimensional consistency and thread specifications, with Class 3A thread fit for superior engagement. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets environmental and safety requirements for industrial use.