S-97345A631 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction for reliable performance in harsh industrial environments
• Precise component alignment through Class 3A thread fit and standardized shoulder diameter for consistent assembly quality
• High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
• Secure installation and removal with knurled socket head and 1/4" hex drive preventing tool slippage
• Optimized thread engagement through 5/16"-18 UNC coarse threads ensuring faster assembly and reduced cross-threading risk
• Dimensional stability with tight shoulder tolerances maintaining precise component positioning
• Regulatory compliance meeting ASME B18.3 standards and environmental regulations for global industrial use

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw delivers exceptional engineering value in precision machinery, automation systems, and industrial equipment where corrosion resistance and dimensional accuracy are critical. The Class 3A thread fit ensures secure fastening in high-vibration environments, while the standardized shoulder diameter provides reliable bearing surfaces for rotating components and precise alignment in assemblies. The knurled socket head with 1/4" hex drive facilitates secure tool engagement during installation and maintenance. With 70,000 psi tensile strength, these shoulder screws maintain structural integrity in applications requiring repeated disassembly and reassembly, making them ideal for manufacturing fixtures, conveyor systems, and precision instrumentation where durability and corrosion resistance are paramount.

Specification Summary & Compliance

This precision shoulder screw features 5/16"-18 UNC coarse threads with Class 3A fit for superior thread engagement and dimensional accuracy. The shoulder diameter maintains tight tolerances of -0.004" to -0.002" with shoulder length tolerance of -0.005" to 0.005" for consistent performance. Manufactured to ASME B18.3 specifications, the component is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, ensuring environmental responsibility while delivering reliable mechanical performance with 70,000 psi tensile strength and 35,000 psi minimum shear strength for industrial applications.