S-8077A754 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 industrial environments and outdoor applications.
• Enhanced durability and wear resistance from the black oxide finish, which also reduces light reflection and provides a sleek appearance.
• High tensile and shear strength (70,000 psi tensile, 35,000 psi shear) ensures reliable performance under heavy loads and mechanical stress.
• Precise Class 3A thread fit guarantees secure, vibration-resistant fastening with minimal risk of loosening in dynamic applications.
• Knurled socket head offers improved grip and easier manual installation or removal, even in tight spaces or with gloved hands.
• Long 7 1/2" shoulder length provides stable alignment and support for rotating components like gears, pulleys, and bearings.
• Compliance with ASME B18.3, RoHS 3, and REACH ensures quality, safety, and environmental standards are met for global industrial use.

Professional Applications & Engineering Value

This shoulder screw is engineered to address common challenges in precision machinery and heavy-duty assemblies, where alignment, corrosion resistance, and mechanical stability are critical. The 316 stainless steel material offers excellent resistance to chemicals, saltwater, and high temperatures, making it suitable for marine, chemical processing, and food industry applications. The black oxide finish not only enhances corrosion protection but also reduces galling and friction during installation. With a Class 3A thread fit and UNC coarse thread, it ensures quick assembly and reliable holding power in vibrating environments. The extended 7 1/2" shoulder length acts as a precise shaft for rotating parts, minimizing misalignment and wear in conveyor systems, automotive jigs, and industrial robots. This combination of high tensile strength and knurled head design delivers consistent performance in demanding industrial fastener applications, reducing maintenance downtime and improving operational efficiency.

Specification Summary & Compliance

This shoulder screw features a 1/2"-13 UNC thread with Class 3A fit for precise dimensional accuracy and secure fastening. The shoulder diameter is 5/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 7 1/2" with a tolerance of -0.005" to 0.005", ensuring consistent performance in alignment-critical applications. It meets ASME B18.3 specifications for dimensional standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and suitable for use in regulated industries.