S-8077A349 3/8"-24 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 long-lasting performance and reduced maintenance.
• High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength, ensuring reliable performance under stress.
• Precise alignment and secure fit thanks to the Class 3A thread fit and fine UNF thread, minimizing vibration loosening.
• Easy installation and removal with the hex socket drive and knurled head, allowing for efficient assembly in tight spaces.
• Accurate positioning due to the precisely toleranced shoulder diameter and length, facilitating consistent component mounting.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial fastening, such as misalignment and component wear. The black oxide finish not only enhances corrosion resistance but also reduces friction, extending service life in demanding applications like machinery assemblies, automotive systems, and precision equipment. Its UNF fine thread and Class 3A fit provide a tight, secure connection that resists loosening under vibration, while the 2 1/2" shoulder length ensures accurate spacing and alignment for rotating parts. Made from high-strength material with a Rockwell B79 hardness, it withstands heavy loads and repetitive use, making it a reliable choice for B2B procurement in sectors requiring durable, compliant fasteners.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005", ensuring high accuracy. It adheres to ASME B18.3 standards for uniformity and performance, with a Class 3A thread fit for superior engagement. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and suitability for global industrial markets.