S-90279A117 4-40 x 1 1/4" ASME B18.6.3 Steel Round Head Phillips Screws
Steel Round Head Phillips 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 plating that protects against rust and extends service life in harsh environments
- High tensile strength of 60,000 psi ensures reliable fastening under heavy loads and vibration
- Rockwell B69 hardness provides excellent durability and resistance to wear and deformation
- Class 2A thread fit offers consistent, easy assembly with standard UNC coarse threads for quick installation
- Fully threaded design allows for maximum grip and holding power along the entire 1-1/4" length
- Phillips drive with No. 1 size enables secure, slip-resistant driving with common tools
- Rounded head profile reduces surface damage and provides a finished appearance in visible applications
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel rounded head Phillips screws are engineered to address common industrial challenges such as corrosion, vibration loosening, and assembly efficiency. The zinc-plated steel construction offers reliable protection against moisture and chemicals, making them ideal for outdoor equipment, electrical enclosures, and machinery where environmental factors are a concern. The coarse UNC threads and Class 2A fit ensure quick, precise installation with reduced cross-threading risks, while the fully threaded design provides uniform clamping force across materials. With 60,000 psi tensile strength and Rockwell B69 hardness, these screws maintain integrity in high-stress applications, from automotive assemblies to industrial fixtures, delivering long-term performance and reduced maintenance costs.
Specification Summary & Compliance
These screws feature precise Class 2A thread fit with UNC coarse threads (4-40 size) and are manufactured to meet ASME B18.6.3 specifications for dimensional accuracy and performance. They comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring they are free from hazardous substances and suitable for global industrial use.
