S-8077A274 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 through Class 3A thread fit and standardized shoulder diameter for reduced assembly vibration
• High mechanical strength delivering 70,000 psi tensile and 35,000 psi shear strength for heavy-duty applications
• Enhanced grip and tool engagement with knurled head texture and 5/8" hex drive for secure installation
• Extended service life with Rockwell B79 hardness providing excellent wear resistance
• Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations (RoHS 3, REACH)
• Optimized load distribution through 5" shoulder length with tight tolerance control for stable rotational motion

Professional Applications & Engineering Value

This 7/8"-9 UNC shoulder screw in 316 stainless steel with black oxide finish addresses critical alignment and corrosion challenges in precision machinery. The Class 3A thread fit ensures minimal backlash in high-vibration environments, while the 1-1/4" shoulder diameter provides exact bearing surfaces for rotating components. Engineering teams specify these socket head shoulder screws for conveyor systems, robotic arms, and packaging equipment where 5" shoulder length maintains axial positioning under dynamic loads. The combination of 70,000 psi tensile strength and corrosion-resistant properties makes these industrial shoulder screws suitable for food processing, marine, and chemical processing applications where environmental resistance and mechanical reliability are paramount.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit (UNF coarse thread). Shoulder diameter tolerance: -0.004" to -0.002"; shoulder length tolerance: -0.005" to 0.005". Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Mechanical properties include Rockwell B79 hardness and minimum 35,000 psi shear strength.