S-97768A374 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and black oxide finish, ideal for harsh industrial environments.
• High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for reliable performance under stress.
• Precise alignment and smooth rotation thanks to the knurled head and standard shoulder fit, reducing assembly time and wear.
• Secure fastening in coarse-thread applications with UNC threading and Class 3A fit, minimizing loosening in high-vibration settings.
• Easy installation and removal using a standard 3/16" hex drive, compatible with common tools for efficient maintenance.
• Durable surface protection from the black oxide finish, enhancing wear resistance and extending service life.
• Consistent dimensional accuracy with tight shoulder tolerances, ensuring reliable fit in precision assemblies.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical challenges in industrial machinery, automation, and precision equipment. The 18-8 stainless steel material provides excellent resistance to rust and corrosion, making it suitable for environments exposed to moisture or chemicals. The black oxide finish adds an extra layer of protection against abrasion, while the UNC coarse threading and Class 3A fit ensure secure engagement in components subject to vibration, such as rotating shafts and linkages. The knurled head improves grip during manual adjustments, and the precise shoulder diameter and length facilitate accurate positioning in assemblies, reducing misalignment and downtime. Ideal for use in industrial fasteners for conveyors, pivots, and bearing mounts, it delivers reliable performance where strength and precision are paramount.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC thread with Class 3A fit for high precision, and dimensions include a shoulder diameter of 3/8" (tolerance: -0.004" to -0.002") and shoulder length of 1 1/2" (tolerance: -0.005" to 0.005"). It meets ASME B18.3 specifications for consistent quality and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability.