S-97345A212 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh or wet industrial environments
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable load-bearing applications
• Precise alignment and positioning ensured by the 2-1/2" shoulder with tight tolerances for consistent assembly fit
• High-accuracy Class 3A thread fit for secure fastening and reduced risk of loosening under vibration
• Easy installation and removal with 5/32" hex socket drive and knurled head for improved grip
• Broad regulatory compliance including ASME B18.3, RoHS 3, and REACH for safe, standardized use
• Durable coarse UNC threading providing robust engagement and resistance to cross-threading

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical alignment and durability challenges in industrial settings. The 1/4"-20 UNC coarse thread with Class 3A fit ensures secure, vibration-resistant connections in machinery, while the precisely machined 2-1/2" shoulder facilitates accurate component positioning in assemblies like rotating shafts, pulleys, and gears. The knurled head and hex socket drive allow for straightforward installation even in confined spaces, reducing assembly time. With high tensile and shear strength, it withstands dynamic loads in automotive, aerospace, and manufacturing equipment, and its corrosion-resistant properties make it suitable for marine or chemical processing applications where moisture and chemicals are present.

Specification Summary & Compliance

This shoulder screw adheres to Class 3A thread fit for precise engagement and meets ASME B18.3 dimensional standards. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", ensuring consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material reliability.