S-8077A117 3/4"-10 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.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under high-stress applications.
• Precision alignment and smooth rotation ensured by the 1" diameter shoulder with tight tolerance fit, reducing wear on mating parts.
• Secure, non-slip installation provided by the knurled socket head and 1/2" hex drive, allowing for high torque application without stripping.
• Consistent, reliable thread engagement with Class 3A UNC coarse threads, ensuring easy assembly and vibration resistance.
• Enhanced durability and minimal galling from the black oxide finish, which also adds a sleek, low-reflectivity appearance.
• Compliance with global standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality and environmental safety for international projects.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The black oxide finish on the socket head not only enhances corrosion resistance but also reduces light reflection in sensitive optical or inspection setups. With a 1" shoulder diameter and precise length tolerance of ±0.005", it provides exact positioning for rotating components like bearings, pulleys, and linkages, minimizing misalignment and extending service life. The coarse UNC thread and Class 3A fit ensure quick, secure fastening in high-vibration environments, from conveyor systems to packaging machinery, where reliability is non-negotiable. Its high tensile and shear strength makes it suitable for load-bearing applications, offering a robust solution that reduces maintenance downtime and improves overall assembly integrity.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for superior engagement and a shoulder diameter tolerance of -0.004" to -0.002" ensuring precise fits. The UNC 3/4"-10 coarse thread and standard shoulder fit provide consistent performance across industrial applications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in environments with strict environmental and health standards.