S-95289A145 1/4"-28 x 3/4" 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.
• Exceptional holding power and vibration resistance due to the Class 3A thread fit and fine UNF thread profile, minimizing loosening.
• High-strength performance with a Rockwell B80 hardness, ensuring durability under load and repeated use.
• Secure and easy installation with the 1/8" hex drive and headless design, allowing for flush mounting in tight spaces.
• Enhanced grip and alignment from the extended tip design, providing positive engagement with the mating component.
• Precision manufacturing ensures consistent dimensions and thread quality, reducing assembly issues and improving fit.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing safety and regulatory acceptance.

Professional Applications & Engineering Value

This 1/4"-28 UNF set screw is engineered to address critical challenges in precision assemblies where space is limited and reliability is non-negotiable. The 18-8 Stainless Steel material offers excellent resistance to rust and corrosion, making it suitable for applications in machinery, automotive, and electronics exposed to moisture or chemicals. Its Class 3A thread fit and fine thread spacing provide a tighter, more secure fastening that resists vibration-induced loosening, common in dynamic industrial environments. The headless design with hex drive allows for unobtrusive installation in confined areas, while the extended tip ensures positive contact and alignment, reducing the risk of component slippage. Ideal for securing gears, pulleys, and collars, this set screw delivers consistent performance in high-stakes engineering applications.

Specification Summary & Compliance

This set screw adheres to Class 3A thread fit tolerances per UNF standards, ensuring precise thread engagement. Key dimensions include a 1/4"-28 thread size, 3/4" length, and an extended tip with specified diameter and length tolerances. It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial use without hazardous substances.