S-90251A543 1/4"-20 x 1 1/2" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Secure vibration resistance with nylon patch thread locker that maintains locking performance in temperatures from -70° to 250°F
• Superior corrosion resistance provided by 18-8 stainless steel construction for extended service life in harsh environments
• Precise thread engagement with Class 3A thread fit ensuring tight tolerances and reliable fastening performance
• Enhanced installation efficiency through hex drive design allowing for easy installation and removal with standard tools
• Excellent material strength with Rockwell B80 hardness providing durability and resistance to deformation under load
• Optimal grip and positioning with cup point design that bites into mating surfaces for secure component alignment
• Industry compliance assurance meeting ASME B18.3 standards and environmental regulations including RoHS 3 and REACH

Professional Applications & Engineering Value

This 1/4"-20 UNC set screw delivers critical engineering solutions for industrial applications requiring permanent component positioning and vibration resistance. The 18-8 stainless steel construction provides exceptional corrosion resistance, making it ideal for harsh environments where chemical exposure or moisture is present. The nylon patch thread locker effectively prevents loosening from vibration and thermal cycling, maintaining clamp load integrity in machinery, automotive assemblies, and precision equipment. The cup point design creates positive engagement with mating surfaces, preventing slippage in high-torque applications. With its hex drive configuration and coarse UNC threads, installation is streamlined while ensuring reliable performance in demanding industrial settings where component security is paramount.

Specification Summary & Compliance

This set screw features Class 3A thread fit precision with 1/4"-20 UNC coarse threads and right-hand thread direction. Manufactured to ASME B18.3 specifications with a length of 1-1/2" and Rockwell B80 hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial applications while meeting stringent quality standards for dimensional accuracy and performance reliability.