S-92311A556 1/4"-28 x 1/4" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 Stainless Steel construction, ideal for harsh environments and long-term reliability.
• Exceptional thread precision and secure fit with a Class 3A thread fit and UNF fine thread, minimizing the risk of loosening under vibration.
• High strength and durability provided by Rockwell B80 hardness, ensuring the set screw maintains its form and function under load.
• Easy and secure installation with a 1/8" hex drive and headless design, allowing for flush mounting in tight spaces.
• Enhanced gripping power from the cup tip, which bites into the shaft for a non-slip, permanent assembly.
• Broad industry compliance meeting ASME B18.3 specifications, ensuring interchangeability and reliability in professional applications.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, making them suitable for regulated global markets.

Professional Applications & Engineering Value

This 1/4"-28 UNF Class 3A fine thread hex headless set screw is engineered to solve critical challenges in precision assembly. The 18-8 Stainless Steel material offers excellent resistance to corrosion and oxidation, making it ideal for applications in machinery, automotive, and electronics where exposure to moisture or chemicals is a concern. The headless design with a 1/8" hex drive allows for a clean, flush finish, perfect for securing collars, gears, and pulleys on shafts without protruding components. The fine thread and Class 3A fit provide a tighter tolerance than standard fits, reducing backlash and ensuring the set screw stays firmly in place even under high vibration or dynamic loads. The cup tip concentrates force for a strong bite, preventing slippage and ensuring a reliable, permanent lock. These features make it a top choice for engineers requiring high-performance industrial fasteners that deliver consistent results in demanding settings.

Specification Summary & Compliance

This set screw features a 1/4"-28 UNF fine thread with a Class 3A thread fit, ensuring high precision and a secure assembly. It is manufactured in accordance with ASME B18.3 standards, guaranteeing dimensional accuracy and reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances and suitable for use in environmentally conscious industries.