S-92311A324 4-48 x 1/2" 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 extended service life.
• Exceptional holding power and vibration resistance from the Class 3A thread fit and fine UNF thread profile, preventing loosening in dynamic applications.
• High-strength, durable fastening ensured by a Rockwell B80 hardness, providing reliable performance under load.
• Secure, flush mounting with a headless design and effective cup point tip that bites into the shaft for positive locking.
• Easy installation and removal with a compact 0.050" hex drive, allowing access in confined spaces.
• Guaranteed dimensional accuracy and interchangeability through compliance with the ASME B18.3 standard.
• Safe for regulated industries with RoHS 3 and REACH compliance, meeting strict environmental and safety standards.

Professional Applications & Engineering Value

This 4-48 UNF thread set screw is engineered to solve critical challenges in precision assembly and machinery. The 18-8 Stainless Steel material offers excellent resistance to oxidation and corrosion, making it suitable for applications exposed to moisture, chemicals, or outdoor elements. The headless design and cup point tip create a flush finish while generating high clamping force and resistance to rotational forces, which is vital for securing gears, pulleys, and collars on shafts. The fine thread and Class 3A fit provide a tighter tolerance than standard fits, reducing the risk of backlash and ensuring precise alignment in high-vibration environments like motors, drives, and automated equipment. This combination of precision engineering and robust materials delivers reliable, long-term performance in demanding industrial settings.

Specification Summary & Compliance

This set screw features a 4-48 UNF fine thread with a Class 3A thread fit, ensuring high precision and minimal play. The dimensional and manufacturing specifications conform to ASME B18.3. The product is certified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming it is free of hazardous substances and safe for use in regulated markets.