S-90289A621 3/8"-16 x 5/8" ASME B18.3 Set Screws
Set Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Maximum holding security with serrated locking mechanism that prevents loosening under vibration and dynamic loads
- Superior corrosion resistance through black-oxide coating on alloy steel, extending service life in demanding environments
- Precise thread engagement with Class 3A fit ensuring tight tolerances and reliable fastening performance
- High-strength construction with Rockwell C45 hardness providing exceptional durability and wear resistance
- Secure installation using 3/16" hex drive that prevents tool slippage and enables high torque application
- Optimal surface contact through cup tip design that concentrates clamping force for superior grip
- Space-saving headless design allowing flush mounting in applications where clearance is limited
Professional Applications & Engineering Value
This 3/8"-16 UNC Class 3A set screw delivers exceptional engineering value in industrial applications where vibration resistance and reliable positioning are critical. The black-oxide alloy steel construction combined with Rockwell C45 hardness ensures long-term performance in machinery, automotive assemblies, and power transmission systems. The serrated locking mechanism addresses common vibration-induced loosening issues, while the cup tip design provides concentrated clamping force for secure shaft and collar applications. The headless configuration with hex drive enables installation in confined spaces where traditional fasteners cannot be used, making it ideal for precision equipment, gear assemblies, and coupling applications requiring flush mounting and reliable torque transmission.
Specification Summary & Compliance
This set screw features 3/8"-16 UNC coarse threads with Class 3A thread fit for precision engagement, right-hand thread direction, and 5/8" length. Manufactured to ASME B18.3 specifications for dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
