S-8077A746 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and Black Oxide finish, 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 in heavy-duty applications.
• Precise alignment and smooth rotation enabled by the 8" shoulder with tight diameter and length tolerances, reducing wear on mating parts.
• Secure, high-torque installation using the 5/16" hex socket drive and knurled head for improved grip and reduced tool slippage.
• Consistent, reliable threading with Class 3A fit and 1/2"-13 UNC coarse thread for easy assembly and strong holding power.
• Enhanced durability and hardness with Rockwell B79 rating, ensuring the screw maintains integrity under repetitive loads.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring quality and environmental safety for global supply chains.

Professional Applications & Engineering Value

This 1/2"-13 shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy industrial equipment. The 316 Stainless Steel material combined with a Black Oxide finish provides excellent resistance to corrosion and oxidation, making it suitable for applications in chemical processing, marine environments, and outdoor settings. The 8-inch shoulder length acts as a precise pivot or axle, ensuring accurate alignment of components like gears, pulleys, and bearings, which minimizes friction and wear. The UNC coarse thread and Class 3A thread fit facilitate quick, secure fastening in high-vibration scenarios, while the socket head with hex drive allows for efficient installation in confined spaces. Ideal for use in assembly jigs, conveyor systems, and robotic arms, this shoulder screw enhances operational reliability and reduces maintenance downtime.

Specification Summary & Compliance

This shoulder screw features a 1/2"-13 UNC thread with Class 3A fit for precise threading, and an 8" shoulder with diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005" to ensure consistent performance. It is manufactured in compliance with ASME B18.3 standards for dimensional accuracy and mechanical properties. The product also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety requirements for industrial use.