S-90086A687 1/4"-20 x 2 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
- Superior corrosion resistance with black-oxide steel coating, extending service life in demanding industrial environments
- Self-tapping capability eliminates need for pre-tapped holes, reducing installation time and labor costs
- Wide material compatibility for reliable performance in aluminum, brass, cast iron, and sheet metal applications
- Optimized thread design with UNC coarse threads providing excellent holding power and vibration resistance
- Secure Phillips No. 3 drive ensures positive torque transmission and reduces cam-out during installation
- 82° countersink angle allows for flush mounting and clean finished appearance
- Full threading maximizes engagement length for superior pull-out strength
Professional Applications & Engineering Value
These 1/4"-20 UNC thread cutting screws are engineered to solve critical fastening challenges in metal fabrication and assembly operations. The black-oxide steel construction provides essential corrosion protection while maintaining the mechanical strength required for demanding applications. The F-type thread cutting design creates precise mating threads in base materials without requiring pre-tapped holes, significantly reducing installation time and eliminating tap breakage risks. Particularly valuable in sheet metal assemblies and aluminum components, these tapping screws deliver reliable performance where vibration resistance and pull-out strength are critical. The flat head Phillips drive configuration ensures flush mounting capabilities while the coarse UNC thread pattern provides excellent holding power in softer metals and alloys.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications SAE J933, ensuring dimensional accuracy and performance reliability. Features 1/4"-20 UNC coarse threads with right-hand orientation and standard Class 2A thread tolerances. Compliant with RoHS 3 (2015/863/EU) environmental standards, making them suitable for regulated industrial applications. The 82° countersink angle and standard flat head profile provide proper seating in prepared holes, while the fully threaded design ensures maximum engagement strength throughout the fastener length.
