S-97768A382 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Enhanced wear resistance and reduced light reflection from the black oxide finish
• High-strength performance with 70,000 psi tensile and 35,000 psi shear strength for demanding applications
• Precise alignment and smooth rotation ensured by the 2" shoulder with controlled diameter tolerance
• Secure, non-slip installation with the knurled socket head and 3/16" hex drive
• Reliable, vibration-resistant fastening from the Class 3A fit 5/16"-18 UNC coarse thread
• Compliance with global standards including ASME B18.3, RoHS 3, and REACH for assured quality and safety

Professional Applications & Engineering Value

This shoulder screw is engineered to provide a robust pivot, axle, or sliding mechanism in precision assemblies. The 18-8 stainless steel material offers excellent resistance to corrosion and oxidation, making it suitable for machinery, automotive, and electronic applications exposed to moisture or chemicals. The 2" shoulder length with tight diameter tolerance ensures components rotate or align without binding, reducing wear on mating parts. The black oxide finish not only enhances durability but also minimizes galling. Combined with the Class 3A thread fit and UNC coarse thread, it delivers secure fastening that withstands vibrations and heavy loads, solving common issues of misalignment and premature failure in dynamic systems.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC thread with Class 3A fit for high precision. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 2" with a tolerance of -0.005" to 0.005". It meets ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability.