S-90086A640 1/4"-20 x 4 1/2" ASME B18.6.3, SAE J933 Tapping Screws
Tapping 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
- Corrosion-resistant zinc plating extends service life in demanding industrial environments
- Thread-cutting F-type design creates precise mating threads in aluminum, brass, and cast iron without pre-tapping
- 82° countersink angle with standard flat head provides flush mounting for clean, professional finishes
- Coarse UNC 1/4"-20 threading ensures rapid installation and superior holding power in sheet metal applications
- Full-length threading maximizes grip strength across the entire fastener length
- No. 3 Phillips drive offers common tool compatibility while resisting cam-out during high-torque installation
- Heavy-duty 4-1/2" length accommodates thicker material assemblies with reliable penetration
Professional Applications & Engineering Value
These zinc-plated steel tapping screws solve critical fastening challenges in metal fabrication and industrial assembly. The thread-cutting F-type design eliminates the need for separate tapping operations, significantly reducing installation time and labor costs when working with aluminum, brass, cast iron, and sheet metal. The coarse UNC 1/4"-20 thread pattern provides exceptional pull-out resistance in softer metals, while the 82° countersink angle ensures secure, flush mounting that prevents snagging and maintains surface integrity. Engineered for production environments, these fully threaded screws deliver consistent performance across varying material thicknesses, making them ideal for HVAC systems, machinery enclosures, and structural metal assemblies where vibration resistance and long-term reliability are paramount.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications (SAE J933) with Class 2A thread tolerances for consistent fit and performance. Features UNC coarse threads with standard flat head profile and No. 3 Phillips drive. Compliant with RoHS 3 (2015/863/EU) environmental standards, ensuring safe use across regulated industries. Designed for use with No. 1 drill bit (0.228" diameter) for proper hole preparation in specified materials.
