S-97345A851 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and chemical exposure
• High mechanical strength delivering 70,000 psi tensile and 35,000 psi shear strength for demanding, heavy-duty applications
• Precise alignment and smooth rotation enabled by the 7 1/2" shoulder with tight diameter and length tolerances
• Secure, non-slip installation with the knurled head and 5/16" hex socket drive for reliable torque transfer
• Consistent, reliable threading with Class 3A fit 1/2"-13 UNC coarse threads for easy assembly and vibration resistance
• Long-term durability supported by Rockwell B79 hardness, resisting wear and deformation under load
• Global compliance and safety meeting ASME B18.3, RoHS 3, and REACH standards for regulated industries

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial machinery, automation systems, and precision equipment. The extended 7 1/2" shoulder length provides a stable, precisely machined pivot or axle, reducing wear on moving parts and maintaining accurate component positioning. The 1/2"-13 UNC coarse thread with Class 3A fit ensures quick, secure fastening even in high-vibration environments, while the knurled head and hex socket drive allow for easy installation and removal without stripping. Its high tensile and shear strength, combined with excellent corrosion resistance, makes it ideal for applications in chemical processing, marine equipment, and food machinery where reliability and longevity are paramount.

Specification Summary & Compliance

This shoulder screw features a 1/2"-13 UNC thread with Class 3A fit for precise thread engagement. The shoulder diameter is 5/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 7 1/2" with a tolerance of -0.005" to 0.005", ensuring high dimensional accuracy. It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards.