S-8077A836 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and Black Oxide finish, ideal for harsh environments and extended service life.
• High-strength performance delivering 70,000 psi tensile strength and 35,000 psi shear strength for reliable load-bearing in demanding applications.
• Precise thread engagement with Class 3A fit and UNC coarse threads ensuring secure fastening and vibration resistance.
• Easy installation and removal featuring a 5/32" hex socket drive and knurled head for improved grip and torque application.
• Accurate component alignment provided by the 5/8" shoulder with tight diameter and length tolerances for consistent assembly.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring quality and regulatory adherence.
• Durable construction with Rockwell B79 hardness for wear resistance and long-term reliability in industrial settings.

Professional Applications & Engineering Value

This 1/4-20 UNC thread shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The 316 Stainless Steel material, combined with a Black Oxide finish, provides exceptional resistance to corrosion and chemical exposure, making it suitable for marine, chemical processing, and outdoor applications. The Class 3A thread fit and coarse UNC thread design ensure minimal loosening under vibration, while the knurled head and hex socket drive facilitate easy installation in confined spaces. The precisely machined shoulder acts as a pivot or spacer, maintaining alignment in assemblies like rotating shafts, bearings, and linkages, reducing wear and improving operational efficiency. This screw delivers reliable performance where dimensional accuracy and high tensile strength are paramount.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC thread with Class 3A fit and a shoulder diameter of 5/16" (tolerance: -0.004" to -0.002") and length of 5/8" (tolerance: -0.005" to 0.005"). It complies with ASME B18.3 specifications for dimensional accuracy and is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to environmental and safety regulations.