S-8077A743 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and chemical exposure
• Enhanced durability and wear resistance from the black oxide finish, reducing maintenance and replacement frequency
• Precise alignment and secure fitting with Class 3A thread fit and standard shoulder fit, minimizing assembly play
• High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
• Easy installation and removal using the knurled socket head with 5/16" hex drive, improving assembly efficiency
• Reliable performance compliance meeting ASME B18.3 standards and RoHS 3/REACH regulations for quality assurance
• Versatile coarse UNC threading (1/2"-13) for quick engagement and reduced cross-threading risks in industrial settings

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial fastening, where corrosion, high stress, and precise component alignment are common concerns. The black oxide finish not only enhances corrosion resistance but also reduces friction during installation, extending the fastener's service life in machinery, automotive, and marine applications. With a Class 3A thread fit and UNC coarse thread, it ensures rapid assembly while maintaining tight tolerances, reducing downtime in production lines. The knurled socket head provides a secure grip for hex drivers, preventing tool slippage and damage in high-torque environments. Ideal for pivots, axles, and spacers, this shoulder screw delivers consistent performance under heavy loads, backed by ASME B18.3 compliance for reliability in engineering-critical systems.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit with UNC 1/2"-13 coarse threading, ensuring precise dimensional accuracy per ASME B18.3 specifications. The shoulder diameter tolerance ranges from -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", supporting consistent assembly. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material integrity for global industrial use.