S-97345A555 1/4"-20 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 the 5/16" shoulder diameter with tight tolerance control for consistent assembly
• High mechanical strength delivering 70,000 psi tensile strength and 35,000 psi shear resistance for demanding applications
• Secure fastening engagement with Class 3A thread fit ensuring vibration resistance and reliable torque transmission
• Easy installation and removal via the 5/32" hex drive socket combined with knurled head for superior grip
• Industry-standard compatibility with 1/4"-20 UNC coarse threads for seamless integration with existing equipment
• Regulatory compliance assurance meeting ASME B18.3 specifications and environmental standards including RoHS 3 & REACH

Professional Applications & Engineering Value

Engineered for precision industrial applications, these 316 stainless steel shoulder screws provide exceptional corrosion resistance in chemical processing, marine, and food-grade environments. The 1/4"-20 UNC coarse thread with Class 3A fit ensures secure fastening in high-vibration machinery while the precisely machined shoulder maintains accurate component alignment in rotating assemblies, pivoting mechanisms, and precision guides. The socket head design with hex drive and knurled texture delivers reliable torque transmission during installation, reducing assembly time and preventing tool slippage. These shoulder screws are particularly valuable in applications requiring both precise locating and secure fastening functions, eliminating the need for additional alignment components and reducing total assembly costs.

Specification Summary & Compliance

This precision shoulder screw features a 1/4"-20 UNC thread with Class 3A thread fit for superior engagement, a 5/16" shoulder diameter with tight tolerance control (-0.004" to -0.002"), and a 3 1/4" shoulder length. Manufactured to ASME B18.3 specifications with material hardness of Rockwell B79, the fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications requiring both mechanical precision and regulatory adherence.