S-90086A634 1/4"-20 x 5/8" 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 thread engagement with Type F thread cutting design for reliable fastening in aluminum, brass, cast iron, and sheet metal without pre-tapped holes.
- Enhanced corrosion resistance from zinc-plated steel construction, ensuring long-term durability in industrial environments.
- High assembly efficiency with UNC coarse threads and fully threaded shank for quick installation and strong holding power.
- Secure flush mounting thanks to the standard flat head profile and 82° countersink angle, minimizing protrusion in applications.
- Easy installation and removal with No. 3 Phillips drive, reducing tool slippage and improving operator control.
- Wide material compatibility for use in diverse substrates like metals and alloys, streamlining inventory for B2B buyers.
- Reliable performance backed by ASME B18.6.3 specifications, ensuring consistent quality and fit in demanding applications.
Professional Applications & Engineering Value
These 1/4"-20 zinc-plated steel tapping screws with Type F thread cutting design address common industrial challenges by creating precise threads in materials like aluminum, brass, cast iron, and sheet metal without the need for pre-tapping. The UNC coarse threads and fully threaded shank enable rapid installation and high pull-out resistance, reducing assembly time and labor costs. The zinc-plated finish provides essential corrosion protection, extending service life in harsh conditions, while the flat head with an 82° countersink ensures a smooth, flush fit that prevents snagging and improves safety. Ideal for industrial fastening in automotive, machinery, and metal fabrication, these screws deliver consistent performance and reduce the risk of strip-out, making them a cost-effective solution for high-volume B2B procurement.
Specification Summary & Compliance
These screws feature a 1/4"-20 UNC coarse thread with standard Class 2A tolerances for reliable fit, and are manufactured to meet ASME B18.6.3 specifications (referencing SAE J933) for dimensional accuracy and performance. Compliance with RoHS 3 (2015/863/EU) ensures they are free of hazardous substances, supporting environmental and safety standards in global supply chains.
