S-97768A323 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and black oxide finish for extended service life in harsh environments
• Precise component alignment ensured by Class 3A thread fit and standard shoulder fit for reduced assembly vibration and improved positioning accuracy
• High mechanical strength delivering 70,000 psi tensile strength and 35,000 psi shear strength to withstand demanding operational loads
• Secure installation and removal with hex socket drive and knurled head design providing superior grip and torque transmission
• Optimized for rapid assembly through UNC coarse threading and right-hand thread direction for faster installation in production environments
• Enhanced durability with Rockwell B55 hardness offering excellent wear resistance in high-cycle applications
• Reliable dimensional stability with tight shoulder diameter and length tolerances maintaining consistent performance across batches

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw with black oxide finish provides critical engineering solutions for precision machinery and industrial equipment. The UNC coarse threading and Class 3A fit ensure secure fastening in high-vibration environments while maintaining precise alignment of rotating components. The knurled head and hex drive design facilitate quick installation and removal in confined spaces, reducing maintenance downtime. With its substantial 1 3/4" shoulder length and 5/16" shoulder diameter, this socket head shoulder screw serves as both a fastener and precision spacer in applications ranging from automation systems to material handling equipment, offering reliable performance where dimensional accuracy and corrosion resistance are paramount.

Specification Summary & Compliance

This shoulder screw features precision 1/4"-20 UNC coarse threads with Class 3A fit for superior thread engagement. Critical dimensions include shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005" ensuring consistent performance. Manufactured to ASME B18.3 specifications and compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for global industrial applications.