S-91658A154 1/4"-20 x 3/4" 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 with 304 Stainless Steel construction, ideal for harsh industrial environments and extended service life.
- Enhanced gripping and holding power from the precision ball tip design, minimizing component slippage and ensuring a secure, permanent fastening.
- High-strength durability with a Rockwell C30 hardness rating for both the screw body and tip, resisting wear and deformation under load.
- Reliable and coarse UNC thread with a Class 2A fit for easy, rapid installation and robust performance in a wide range of materials.
- Streamlined, headless design with a 1/8" hex drive allows for flush mounting in confined spaces and a clean, unobtrusive finish.
- Broad industrial compliance meeting RoHS 3 and REACH regulations, ensuring safety and environmental responsibility for global supply chains.
Professional Applications & Engineering Value
Engineered for demanding applications, this 304 Stainless Steel hex headless set screw provides a robust solution for securing collars, gears, and pulleys onto shafts. The ball tip design concentrates pressure, creating a reliable dimple for superior anti-rotation security compared to flat or cup point alternatives, preventing loosening from vibration—a common failure point in machinery. The coarse UNC thread ensures quick assembly and strong holding power in softer materials or when frequent adjustments are not required. Its headless profile is critical in applications where protruding fastener heads are not feasible, making it a staple in precision assemblies, automotive components, and conveyor systems. The inherent corrosion resistance of 304 stainless steel makes it suitable for outdoor, marine, or chemically exposed environments, offering long-term reliability and reducing maintenance cycles.
Specification Summary & Compliance
This set screw adheres to UNC thread standards with a Class 2A thread fit for consistent, interchangeable assembly. The dimensional accuracy includes a 1/4"-20 thread size and a 3/4" length. The product is manufactured to be fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming its adherence to strict environmental and safety regulations for industrial use.
