S-8077A739 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 extended service life
• Enhanced durability and wear resistance from the black oxide finish, providing added protection against abrasion
• High-strength performance with 70,000 psi tensile and 35,000 psi shear strength for demanding mechanical applications
• Precise alignment and smooth rotation ensured by the 2" shoulder with tight diameter and length tolerances
• Secure, non-slip installation thanks to the knurled socket head and 5/16" hex drive for reliable torque transmission
• Consistent, reliable threading with Class 3A fit and 1/2"-13 UNC coarse thread for quick assembly and high load capacity
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH for guaranteed quality and safety

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial machinery, automation, and precision equipment. The black oxide finish enhances corrosion resistance, reducing maintenance in humid or chemically aggressive settings. Its 2" shoulder length and precise tolerances provide stable bearing surfaces, minimizing misalignment and wear in rotating assemblies like linkages, pivots, and gears. The Class 3A UNC thread and coarse pitch ensure robust fastening under vibration, while the knurled socket head allows for secure tool engagement in confined spaces. Ideal for applications requiring high shear strength and dimensional accuracy, this screw delivers reliable performance in automotive, marine, and food processing equipment.

Specification Summary & Compliance

The screw features a 1/2"-13 UNC Class 3A thread with coarse spacing, ensuring precise fit and high load capacity. Shoulder dimensions include a diameter of 5/8" (tolerance: -0.004" to -0.002") and length of 2" (tolerance: -0.005" to 0.005") for accurate alignment. It meets ASME B18.3 specifications for dimensional consistency and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, supporting safe and sustainable industrial use.