S-90280A108 4-40 x 3/8" ASME B18.6.3 Steel Fillister Head Slotted Screws
Steel Fillister Head Slotted 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 zinc-plated steel construction for extended service life in demanding environments
- Enhanced torque transmission through the deep slotted drive design, preventing tool slippage during installation
- Optimized head clearance with the high, narrow fillister profile, ideal for applications with limited space
- Reliable thread engagement with fully threaded UNC coarse threads and Class 2A fit for secure fastening
- Exceptional mechanical strength backed by Rockwell B69 hardness, ensuring durability under stress
- Broad industrial compatibility meeting ASME B18.6.3 specifications for consistent performance
- Environmental compliance assurance with RoHS 3 and REACH regulations for safe, sustainable use
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel fillister head slotted screws address critical engineering challenges in precision assembly. The zinc plating provides a protective barrier against oxidation, making them ideal for electronics, machinery, and automotive components exposed to moisture. The high, narrow rounded head profile offers superior clearance in confined spaces while maintaining a low-profile appearance. With fully threaded coarse UNC threads and Class 2A fit, they ensure rapid installation and vibration-resistant connections in sheet metal, plastic housings, and industrial equipment. The Rockwell B69 hardness guarantees consistent performance in high-stress applications, reducing the risk of stripping or failure.
Specification Summary & Compliance
This screw features a 4-40 UNC coarse thread with Class 2A thread fit for standard industrial tolerances. It is manufactured to ASME B18.6.3 specifications for dimensional accuracy and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets current environmental and safety standards for hazardous substances.
