S-90291A861 1/4"-28 ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior vibration resistance with durable Nylon 6/6 plastic tip that prevents loosening under dynamic loads
• Excellent corrosion resistance provided by 18-8 Stainless Steel construction for long service life in harsh environments
• Precise thread engagement with Class 3A thread fit ensuring reliable, secure fastening in critical applications
• Wide temperature compatibility with tip performance maintained from -50° to 250°F for diverse operating conditions
• Enhanced installation control through 1/8" hex drive design allowing precise torque application
• Surface protection with non-marring nylon tip that prevents damage to mating components
• Optimized for fine threading with UNF 1/4"-28 thread pattern delivering superior holding power

Professional Applications & Engineering Value

This nylon tip set screw delivers exceptional engineering value in applications where vibration resistance and surface protection are critical. The 18-8 Stainless Steel construction provides reliable corrosion resistance while the UNF fine thread pattern with Class 3A fit ensures precise engagement in threaded components. The headless design with hex drive allows for flush mounting in confined spaces, making it ideal for precision machinery, automotive assemblies, and electronic enclosures. The Nylon 6/6 tip maintains integrity across a broad temperature range from -50° to 250°F, preventing galling and damage to shaft surfaces while providing consistent clamping force in vibrating environments.

Specification Summary & Compliance

This 1/4"-28 UNF set screw features precision Class 3A thread tolerances for superior fit and performance. Manufactured to ASME B18.3 specifications with Rockwell B80 hardness for consistent mechanical properties. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety standards. The right-hand thread direction and fine thread spacing ensure optimal performance in industrial fastening applications requiring high precision and reliability.