S-8077A583 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel and black oxide finish, ideal for harsh industrial environments.
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads and mechanical stress.
• Precision Class 3A thread fit provides tight, secure fastening with minimal backlash in assemblies.
• Knurled socket head with hex drive allows for easy installation and removal, even in tight spaces.
• Long 3 1/2" shoulder length offers stable alignment and support for rotating parts or pivoting mechanisms.
• Compliance with ASME B18.3, RoHS 3, and REACH guarantees quality, safety, and environmental standards.
• Coarse UNC thread design enables quick assembly and disassembly, reducing labor time in production.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw with a black oxide finish is engineered to address common industrial challenges such as corrosion, misalignment, and high-stress fatigue. Its Class 3A UNC thread and precise shoulder diameter of 3/8" ensure accurate positioning in machinery, reducing wear on components. The 3 1/2" shoulder length provides robust support for applications like pivoting arms, gear assemblies, and conveyor systems, where consistent alignment is critical. With a tensile strength of 70,000 psi and Rockwell B79 hardness, it withstands repetitive motion and heavy loads, making it ideal for automotive, aerospace, and manufacturing sectors that demand durability and reliability in industrial shoulder screws.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC thread with Class 3A fit for high precision, and tolerances include shoulder diameter of -0.004" to -0.002" and shoulder length of -0.005" to 0.005". It complies with ASME B18.3 manufacturing standards, ensuring consistent quality, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety and restricted substances.