S-97768A384 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and protective black oxide finish, ideal for harsh industrial environments
• Precision alignment and reduced wear thanks to the 2 1/8" shoulder with tight length tolerance, ensuring accurate component positioning
• Superior load-bearing capacity with a high tensile strength of 70,000 psi and shear strength of 35,000 psi for demanding applications
• Reliable, vibration-resistant fastening achieved through the Class 3A fit coarse UNC thread, minimizing the risk of loosening
• Easy installation and removal with a hex socket drive and knurled head for improved grip, even in confined spaces
• Enhanced durability and hardness from Rockwell B55 rating, providing long-term performance under mechanical stress
• Guaranteed quality and safety through compliance with ASME B18.3, RoHS 3, and REACH regulations

Professional Applications & Engineering Value

This high-strength shoulder screw is engineered to solve critical alignment and pivot point challenges in industrial machinery, automation systems, and precision assemblies. The 18-8 stainless steel material, combined with a black oxide finish, offers excellent resistance to corrosion and oxidation, extending service life in demanding environments. The precision 2 1/8" shoulder length with its tight tolerance ensures components like gears, bearings, and linkages are held at exact distances, reducing misalignment and wear. The coarse UNC thread with a Class 3A fit provides secure, vibration-resistant fastening, while the socket head with hex drive allows for efficient installation in space-constrained applications, making it a reliable choice for engineers seeking durability and precision.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC thread with a Class 3A fit for precise engagement. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 2 1/8" with a tolerance of -0.005" to 0.005", ensuring high dimensional accuracy. Manufactured to meet ASME B18.3 specifications, it is also compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental and safety standards for global industrial use.