S-92311A558 1/4"-28 x 3/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and long-term reliability.
• Maximum holding power and vibration resistance due to the fine UNF thread and Class 3A fit, ensuring a secure, precise connection.
• High-strength performance backed by a Rockwell B80 hardness, providing excellent durability under load.
• Easy installation and high torque application with the hex drive and 1/8" drive size, allowing for efficient assembly with standard tools.
• Secure, flush mounting thanks to the headless and cup tip design, preventing snagging and providing positive seating.
• Guaranteed dimensional consistency and interchangeability, manufactured to meet the stringent ASME B18.3 specification.
• Safe for regulated industries with full compliance to RoHS 3 and REACH environmental standards.

Professional Applications & Engineering Value

This 1/4"-28 UNF Class 3A set screw is engineered to solve critical challenges in precision assemblies where space is limited and vibration is a concern. The headless design and hex drive allow for a completely flush installation, making it perfect for securing collars, gears, and pulleys on shafts without protruding components. Manufactured from 18-8 Stainless Steel, it offers excellent resistance to corrosion and oxidation, ensuring long-term performance in demanding environments like machinery, automotive, and aerospace applications. The fine thread spacing and Class 3A thread fit provide a tighter grip and superior resistance to loosening under dynamic loads, enhancing the overall reliability and safety of your equipment. This combination of material and design directly addresses the need for durable, high-precision fastening solutions in industrial settings.

Specification Summary & Compliance

This set screw features a 1/4"-28 UNF fine thread with a Class 3A thread fit for high precision and strength. It is manufactured in compliance with ASME B18.3 standards, ensuring consistent quality and dimensional accuracy. The product is also confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting essential environmental and safety regulations for industrial use.