S-97345A398 8-32 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction for extended service life in harsh environments
• Precise component alignment through Class 3A thread fit ensuring reliable positioning and reduced assembly vibration
• Enhanced torque transmission with hex socket drive and knurled head for secure fastening without slippage
• High mechanical strength delivering 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
• Optimized shoulder design with 1/4" diameter providing stable bearing surfaces for rotating components
• Industry-standard compatibility with UNC coarse threads and ASME B18.3 specifications for seamless integration
• Environmental compliance meeting RoHS 3 and REACH standards for safe use across regulated industries

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw delivers exceptional engineering value in precision applications where corrosion resistance and dimensional stability are critical. The UNC coarse threads with Class 3A fit provide superior engagement in tapped holes, eliminating play in assemblies requiring exact component positioning. The knurled hex socket head ensures positive drive engagement during installation, preventing tool slippage that can damage critical components. The precisely machined shoulder diameter serves as a reliable pivot point or locating surface in machinery, automotive, and aerospace applications where rotational alignment is essential. With its high tensile strength and corrosion-resistant properties, this shoulder screw maintains integrity in demanding environments including chemical processing, marine applications, and food processing equipment where exposure to moisture and aggressive substances is common.

Specification Summary & Compliance

This precision shoulder screw features 8-32 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy. The shoulder maintains tight tolerances with diameter of 1/4" (-0.004" to -0.002") and length of 1/4" (-0.005" to 0.005"). Manufactured to ASME B18.3 specifications with material hardness of Rockwell B79. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards for restricted substance control.