S-95289A146 1/4"-28 x 1" 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
• Precise, secure fastening ensured by Class 3A thread fit and UNF fine threads, minimizing the risk of loosening under vibration
• High mechanical strength and durability from Rockwell B80 hardness, providing excellent resistance to wear and deformation
• Easy installation and removal with the 1/8" hex drive headless design, allowing for flush mounting and access in confined spaces
• Enhanced gripping power due to the extended tip design, which increases surface contact for a more secure hold on shafts and collars
• Reliable performance in regulated industries as it is RoHS 3 and REACH compliant, meeting strict environmental and safety standards
• Guaranteed dimensional accuracy and interchangeability by conforming to the ASME B18.3 specification

Professional Applications & Engineering Value

This 1/4"-28 UNF Class 3A set screw is engineered to address common industrial challenges such as component slippage and corrosion-induced failure. Made from 18-8 Stainless Steel, it offers excellent resistance to rust and oxidation, making it suitable for applications in moist or chemically aggressive environments like marine equipment, food processing machinery, and outdoor assemblies. The fine thread spacing and Class 3A thread fit provide a tighter, more precise engagement, reducing the likelihood of loosening in high-vibration settings such as motors, pulleys, and precision instruments. The extended tip enhances grip on rotating parts, preventing misalignment and improving overall system stability. Its headless design with a hex drive allows for sleek, space-saving installations, ideal for compact mechanical systems where protrusions are not feasible.

Specification Summary & Compliance

This set screw features a 1/4"-28 UNF fine thread with a Class 3A thread fit, ensuring high precision and tight tolerances. The extended tip has a diameter of 0.156" with a tolerance of -0.007" to 0", and a length of 0.134" with a tolerance of -0.005" to 0". It is manufactured in compliance with ASME B18.3 standards and is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming adherence to environmental and safety regulations.