S-90298A863 5/8"-11 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction for long-lasting performance in harsh industrial environments
• Precise component alignment through the 3/4" shoulder diameter with tight tolerance control for reduced assembly vibration
• Exceptional load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for heavy-duty applications
• Reliable thread engagement with Class 3A thread fit ensuring consistent fastening performance and reduced loosening
• Enhanced grip and torque application through knurled head texture and 3/8" hex drive for secure installation
• Extended service life with Rockwell B55 hardness providing excellent wear resistance in high-cycle applications
• Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations for global industrial use

Professional Applications & Engineering Value

This 5/8"-11 UNC shoulder screw delivers critical engineering solutions for precision machinery and industrial equipment. The 18-8 stainless steel construction provides exceptional corrosion resistance while maintaining structural integrity in demanding environments. The 6 1/2" shoulder length with controlled tolerances enables precise component spacing and rotational alignment in assemblies, reducing wear and vibration. The Class 3A thread fit ensures reliable fastening in high-vibration applications, while the knurled socket head facilitates secure tool engagement during installation. These shoulder screws are engineered to withstand substantial axial and shear loads in automation systems, conveyor equipment, and precision manufacturing fixtures where dimensional stability and corrosion resistance are paramount.

Specification Summary & Compliance

This shoulder screw features 5/8"-11 UNC coarse threads with Class 3A thread fit for precision engagement. Critical dimensions include shoulder diameter of 0.750" with tolerance of -0.004" to -0.002" and shoulder length of 6.500" with tolerance of -0.005" to +0.005". Manufactured to ASME B18.3 specifications with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The right-hand thread direction and standard socket head profile ensure compatibility with industrial fastening systems.