S-97345A651 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh industrial environments and chemical exposure.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi minimum shear strength for reliable, high-stress fastening.
• Precise shoulder alignment with a 1 3/4" shoulder length and tight tolerances, ensuring accurate component positioning and reduced assembly play.
• High-accuracy Class 3A thread fit for secure, vibration-resistant connections in demanding applications.
• Easy installation and removal with a 3/16" hex socket drive and knurled head for improved grip and torque application.
• Compliance with major standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality and environmental safety.
• Durable and long-lasting performance backed by Rockwell B79 hardness, reducing wear and maintenance needs.

Professional Applications & Engineering Value

This 316 Stainless Steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and assembly fixtures. The 5/16"-18 UNC coarse thread and Class 3A thread fit provide superior holding power and resistance to loosening under vibration, while the 1 3/4" shoulder length with controlled tolerances ensures exact alignment of moving parts like gears, pulleys, and bearings. The knurled head and hex socket drive facilitate quick, secure installation in tight spaces, reducing assembly time. Its corrosion-resistant properties make it suitable for food processing, marine, and chemical industries, where durability and compliance with ASME B18.3 standards are essential for operational reliability.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC coarse thread with Class 3A fit for precise engagement, a shoulder diameter of 3/8" with tolerance from -0.004" to -0.002", and a shoulder length of 1 3/4" with tolerance from -0.005" to 0.005". It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial use.