S-95289A137 1/4"-20 x 5/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance provided by 18-8 Stainless Steel material, ensuring long-term reliability in harsh industrial environments.
• Superior holding power and vibration resistance from the extended tip design, which increases surface contact and prevents component slippage.
• Precise installation and high torque capability enabled by the 1/8" hex drive and headless design, ideal for confined spaces.
• Reliable thread engagement with UNC coarse threads and Class 3A fit, offering tighter tolerances for secure fastening in demanding applications.
• Enhanced mechanical strength and durability due to Rockwell B80 hardness, reducing wear and deformation under load.
• Broad industry compliance meeting ASME B18.3 standards, along with RoHS 3 and REACH environmental regulations for safe, global use.
• Optimized for right-hand thread applications with consistent performance in assembly lines and machinery.

Professional Applications & Engineering Value

This hex headless set screw is engineered to address critical challenges in industrial assembly, such as component loosening due to vibration and corrosion-induced failure. Crafted from 18-8 Stainless Steel, it provides excellent resistance to rust and chemicals, making it suitable for outdoor, marine, and chemical processing equipment. The extended tip increases grip on shafts and collars, preventing axial movement in high-stress environments like motor mounts and gear assemblies. With UNC coarse threads and a Class 3A thread fit, it ensures quick, secure installation and maintains clamping force in heavy-duty applications. Its compact, headless design allows use in tight spaces, reducing assembly time and improving machinery uptime.

Specification Summary & Compliance

This set screw features a 1/4"-20 UNC coarse thread with Class 3A thread fit for precise dimensional accuracy. It adheres to ASME B18.3 manufacturing specifications, ensuring consistent quality and performance. The extended tip has tight tolerances (tip diameter: 0.156" with -0.007" to 0 tolerance; tip length: 0.134" with -0.005" to 0 tolerance) for reliable application. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety standards for industrial use.