S-97768A295 1/4"-28 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments.
• Precise alignment and reduced wear due to the Class 3A thread fit and standard shoulder, ensuring reliable assembly.
• Enhanced durability and load capacity from a tensile strength of 70,000 psi and Rockwell B55 hardness.
• Superior grip and anti-loosening provided by the knurled head texture and fine UNF threads.
• Easy installation with standard tools using the 5/32" hex drive and socket head design.
• Long-lasting surface protection through the black oxide finish, resisting rust and abrasion.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH for safe, reliable use.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical alignment and durability challenges in industrial applications. The 18-8 stainless steel material offers excellent resistance to corrosion and oxidation, making it suitable for machinery, automotive, and electronics where environmental factors are a concern. The Class 3A thread fit and fine UNF threads ensure tight, secure fastening, reducing the risk of vibration-induced loosening. Combined with a black oxide finish, it provides added protection against wear and extends service life. The knurled head and socket drive facilitate quick assembly and disassembly, saving time in maintenance and production lines while meeting rigorous performance demands.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional tolerances, including a Class 3A thread fit for high accuracy and a shoulder diameter tolerance of -0.004" to -0.002". It conforms to ASME B18.3 specifications for consistent quality and performance. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met for global industrial use.