S-90291A879 1/2"-20 ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior mar-free fastening with durable nylon 6/6 plastic tip that protects sensitive surfaces from damage during assembly
• Exceptional corrosion resistance through 18-8 stainless steel construction, ideal for harsh industrial environments
• Precise thread engagement with Class 3A UNF fine threads ensuring superior holding power and vibration resistance
• Wide temperature compatibility with nylon tip rated for -50° to 250° F, maintaining performance across diverse operating conditions
• Enhanced installation control through 1/4" hex drive design allowing high torque application without head protrusion
• Reliable regulatory compliance meeting ASME B18.3 specifications and environmental standards including RoHS 3 and REACH
• Optimized tip design featuring 0.125" length and 0.25" diameter green nylon tip for consistent seating and visible inspection

Professional Applications & Engineering Value

These 18-8 stainless steel set screws with nylon tips provide engineered solutions for precision assembly challenges where surface protection and vibration resistance are critical. The UNF fine thread configuration with Class 3A fit delivers superior clamping force in applications requiring minimal thread clearance, while the green nylon 6/6 plastic tip prevents damage to shafts, gears, and precision components. The headless hex drive design allows flush mounting in confined spaces, making these industrial set screws ideal for machinery, automotive, and electronic assemblies where reliability and surface integrity are paramount. The combination of Rockwell B80 hardness and corrosion-resistant stainless steel ensures long-term performance in demanding environments.

Specification Summary & Compliance

Manufactured to ASME B18.3 standards with Class 3A thread fit precision and 1/2"-20 UNF fine threads. Features include 1/4" hex drive, right-hand thread direction, and 0.5" thread diameter. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The nylon tip maintains performance across the specified temperature range of -50° to 250° F while providing consistent anti-loosening properties.