S-90471A155 4-40 x 1/4" ASME B18.6.3 Steel Phillips Flat Head Screws
Steel Phillips Flat Head 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
- Precision Class 2A thread fit ensures smooth installation and reliable fastening performance in industrial assemblies
- 100° countersink angle provides optimal flush seating for clean, professional finishes
- Rockwell B70 hardness rating delivers exceptional durability and resistance to wear under load
- Fully threaded coarse spacing enables maximum grip strength and faster installation in various materials
- Phillips No. 1 drive compatibility offers widespread tool accessibility and efficient torque transfer
- Comprehensive compliance with ASME B18.6.3, RoHS 3, and REACH standards ensures quality and environmental responsibility
Professional Applications & Engineering Value
These 4-40 UNC flat head screws provide critical engineering solutions where flush mounting and corrosion resistance are paramount. The zinc-plated steel construction effectively combats environmental degradation in industrial settings, while the coarse thread spacing and fully threaded design prevent stripping in softer materials and ensure maximum thread engagement. The 100° countersink angle enables precise seating in pre-drilled holes, eliminating protrusions that could interfere with moving components or compromise safety. These Phillips drive screws are engineered for applications requiring reliable fastening in electronics enclosures, machinery panels, and automotive assemblies where vibration resistance and long-term performance are critical.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerances for consistent performance. The UNC coarse thread profile (4-40) with right-hand threading follows industry standards for compatibility. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures responsible manufacturing practices and material safety.
