S-90291A529 1/4"-20 ASME B18.3 Set Screws
Set Screws
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Basic Information
Head Parameters
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
Installation & Application
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Key Features & Benefits at a Glance
- Superior vibration resistance with a durable green nylon 6/6 tip that prevents loosening under dynamic loads
- High-strength 18-8 stainless steel construction provides excellent corrosion resistance and long-term durability in harsh environments
- Precise Class 3A thread fit ensures tight, reliable engagement and consistent performance in critical assemblies
- 1/8" hex drive design allows for easy installation and removal with standard tools, reducing assembly time
- Wide temperature tolerance from -50° to 250°F maintains tip integrity and locking function in extreme conditions
- Rockwell B80 hardness offers optimal balance of strength and ductility for repeated use without stripping
- Headless, right-hand coarse thread design enables flush mounting and quick installation in UNC-threaded components
Professional Applications & Engineering Value
This 1/4-20 UNC Class 3A set screw is engineered to solve common industrial challenges like component slippage and vibration-induced failure. The green nylon 6/6 tip creates a resilient locking interface that absorbs shocks and maintains clamp force, making it ideal for machinery, automotive, and electronics assemblies where secure fastening is critical. Manufactured from 18-8 stainless steel, it resists rust and chemical exposure, while the coarse thread and hex drive facilitate rapid installation in high-volume production lines. Its headless design ensures a clean profile in confined spaces, providing reliable performance in pulley systems, shafts, and adjustable mechanisms.
Specification Summary & Compliance
This set screw adheres to ASME B18.3 specifications with a Class 3A thread fit for precision tolerance. It features a 1/4"-20 UNC coarse thread with right-hand direction and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for environmental safety. The nylon tip has a diameter of 1/8" and length of 0.063", supporting consistent locking performance across industrial applications.
