S-90289A533 1/4"-20 x 1/4" ASME B18.3 Set Screws
Set Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with black-oxide coating, extending service life in harsh industrial environments
- Exceptional holding power from the cup point design that bites into materials for secure, vibration-resistant locking
- Precise Class 3A thread fit ensures tight tolerances and reliable engagement for critical assembly applications
- High-strength alloy steel construction with Rockwell C45 hardness provides excellent durability under heavy loads
- Easy installation and removal with 1/8" hex drive, allowing efficient maintenance in confined spaces
- Headless design enables flush mounting where protruding fasteners are not feasible
- Full regulatory compliance with ASME B18.3, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these black-oxide alloy steel set screws deliver reliable performance in machinery, automotive components, and precision equipment. The cup point design creates permanent seating by displacing material, preventing loosening from vibration—a common failure point in rotating assemblies. With UNC coarse threads and Class 3A fit, these screws provide superior engagement in both soft and hard materials, while the 1/8" hex drive offers ample torque transmission without stripping. The headless configuration makes them ideal for space-constrained applications where traditional fasteners would interfere with moving parts or require additional clearance.
Specification Summary & Compliance
This set screw features precise 1/4"-20 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy. Manufactured to meet ASME B18.3 specifications and compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The right-hand thread direction and Rockwell C45 hardness ensure consistent performance across industrial applications requiring reliable, high-strength fastening solutions.
