S-8077A273 7/8"-9 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 industrial environments
• Precise component alignment ensured by the 4" shoulder with tight diameter tolerance for reduced vibration and wear
• High-load capacity delivering 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
• Secure installation and removal with 5/8" hex drive and knurled head for improved grip during torque application
• Reliable thread engagement through Class 3A fit UNC coarse threads, minimizing cross-threading risks
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for quality assurance and environmental safety
• Enhanced durability with Rockwell B79 hardness, maintaining performance under repeated stress

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw with black oxide finish addresses critical engineering challenges in heavy machinery, automation systems, and precision equipment. The 4" shoulder length provides stable bearing surfaces for rotating components, reducing misalignment and extending service life in high-vibration environments. Its 7/8"-9 UNC coarse threads with Class 3A fit ensure rapid assembly and disassembly while maintaining secure fastening under dynamic loads. The combination of corrosion-resistant material and 70,000 psi tensile strength makes it suitable for marine, chemical processing, and outdoor industrial applications where both durability and precision are paramount.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit and UNC coarse threading. Shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005" ensure dimensional accuracy. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.