S-90291A144 6-32 ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Secure, Damage-Free Fastening: Nylon 6/6 plastic tip prevents marring and damage to mating surfaces, ideal for precision assemblies.
• Superior Corrosion Resistance: Made from 18-8 Stainless Steel for excellent durability in harsh or humid industrial environments.
• High-Strength Thread Engagement: UNC coarse threads with Class 3A fit ensure a tight, reliable, and vibration-resistant hold.
• Optimized Torque Application: 1/16" hex drive allows for high installation torque in confined, headless designs.
• Wide Thermal Performance: Nylon tip maintains integrity across a broad temperature range from -50°F to 250°F.
• Consistent Mechanical Properties: Rockwell B80 hardness provides a reliable balance of strength and ductility for repeated use.
• Flush, Low-Profile Installation: Headless design with a 1/4" length enables a smooth, unobtrusive finish in mounted components.

Professional Applications & Engineering Value

This 6-32 UNC Class 3A set screw is engineered to solve critical challenges in industrial assembly and precision mounting. The 18-8 Stainless Steel construction offers robust corrosion resistance, essential for machinery in demanding environments, while the Rockwell B80 hardness ensures the fastener can withstand significant shear forces without deforming. The nylon tip is a key differentiator, providing a non-marring, self-locking feature that prevents loosening from vibration—a common failure point in motor shafts, pulleys, and gear assemblies. Its coarse thread design allows for quicker installation and stronger holding power in softer materials or when a secure, permanent set is required. The combination of a hex drive and headless body makes it perfect for applications where space is limited and a flush surface is critical, ensuring reliable performance in everything from electronic enclosures to automotive components.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications, ensuring dimensional accuracy and interchangeability. The threads are 6-32 UNC with a Class 3A fit for superior tolerance and a secure, precise thread engagement. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances and safe for use in various global markets.