S-90778A410 1/4"-20 x 3/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and chemical exposure
• Maximum holding power and vibration resistance due to the 90° cone point design that bites securely into mating surfaces
• Precise and reliable thread engagement ensured by the Class 3A thread fit for high-strength, precision assemblies
• Exceptional mechanical strength and durability provided by a Rockwell B80 hardness rating
• Easy installation and removal with the internal hex drive style, requiring minimal clearance in headless applications
• Broad industrial compatibility with the standard 1/4"-20 UNC coarse thread, suitable for a wide range of equipment
• Guaranteed quality and safety compliance meeting ASME B18.3 specifications and environmental regulations like RoHS 3 and REACH

Professional Applications & Engineering Value

This high-performance 1/4"-20 UNC set screw in 316 stainless steel is engineered to solve critical challenges in industrial fastening. The headless design with a hex drive allows for flush mounting in confined spaces, preventing interference while the 90° cone point provides aggressive gripping to resist loosening under severe vibration—a common failure point in machinery and rotating assemblies. The Class 3A thread fit ensures tight tolerances and reliable performance in high-stress applications, from precision manufacturing equipment to marine and chemical processing systems where corrosion resistance is paramount. Its compliance with major standards makes it a trusted component for engineers requiring durability and regulatory adherence.

Specification Summary & Compliance

This set screw features a 1/4"-20 UNC coarse thread with a Class 3A thread fit for precision and strength. It is manufactured from 316 Stainless Steel and heat treated to a Rockwell B80 hardness. The product conforms to ASME B18.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets rigorous industry and environmental standards for safe and reliable use.