S-90778A416 1/4"-20 x 1/2" 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
- Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction
- Exceptional thread fit and holding power ensured by the precise UNC Class 3A thread specification
- High-strength, durable performance with a Rockwell B80 hardness rating for reliable, long-term use
- Secure, non-slip fastening provided by the 90° cone point tip that digs into materials for superior grip
- Easy installation in confined spaces with the headless design and 1/8" hex drive for straightforward tool access
- Wide industrial compatibility with the coarse 1/4"-20 UNC thread, suitable for various assembly applications
- Compliance with global standards including ASME B18.3, RoHS 3, and REACH for safe, regulated use
Professional Applications & Engineering Value
This 316 stainless steel set screw is engineered to address critical challenges in industrial assembly, such as component slippage and corrosion-induced failure. The headless design with a hex drive allows for installation in tight spaces where traditional screws are impractical, while the 90° cone point provides aggressive biting action to prevent rotational loosening under vibration—common in machinery and automotive applications. The UNC coarse thread facilitates quick assembly and disassembly, reducing labor time. Its Class 3A thread fit ensures minimal backlash and precise alignment, making it ideal for securing pulleys, gears, and collars on shafts in demanding environments like marine, chemical processing, and outdoor equipment, where corrosion resistance and reliability are paramount.
Specification Summary & Compliance
This set screw adheres to ASME B18.3 specifications, with a 1/4"-20 UNC coarse thread and Class 3A fit for high precision. It features a 1/2" length, 1/8" hex drive, and right-hand thread direction. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for industrial use.
