S-90291A862 1/4"-28 ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Vibration-resistant secure locking with durable nylon 6/6 tip that prevents loosening under dynamic loads
• Superior corrosion resistance from 18-8 stainless steel construction for long service life in harsh environments
• Precise Class 3A thread fit ensures tight tolerances and reliable fastening in critical applications
• Easy installation and removal with 1/8" hex drive design requiring minimal clearance
• Wide temperature compatibility with nylon tip performing from -50° to 250°F (-45° to 121°C)
• Consistent performance maintained through Rockwell B80 hardness and controlled manufacturing
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global acceptance

Professional Applications & Engineering Value

This 1/4"-28 UNF Class 3A set screw with nylon tip addresses critical vibration-induced loosening challenges in precision assemblies. The 18-8 stainless steel body provides excellent corrosion resistance while the fine thread configuration ensures superior holding power in softer materials. The green nylon 6/6 plastic tip creates consistent friction locking without damaging shaft surfaces, making it ideal for adjustable components in machinery, automotive systems, and electronic enclosures. The headless design with 1/8" hex drive allows installation in confined spaces while maintaining flush surfaces. Engineering teams specify this vibration resistant set screw for permanent positioning applications where reliability and non-marring contact are paramount.

Specification Summary & Compliance

This precision fastener features Class 3A thread fit with 1/4"-28 UNF fine threads and right-hand thread direction. Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and performance. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) requirements for chemical safety. Additional specifications include 1" length, 0.25" thread diameter, and Rockwell B80 hardness rating, ensuring consistent quality across production batches for industrial applications.