S-90087A889 1/4"-20 x 3" 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 zinc-plated steel construction, extending service life in demanding industrial environments.
- Efficient thread cutting performance in materials like aluminum, brass, cast iron, and sheet metal, reducing installation time and effort.
- Reliable drive engagement with a Phillips No. 3 drive, minimizing cam-out and ensuring secure fastening.
- Optimized for high-strength applications using coarse UNC 1/4"-20 threads, providing excellent holding power in various substrates.
- Full threading along the 3" length ensures consistent grip and load distribution, enhancing joint integrity.
- Compliance with ASME B18.6.3 and SAE J933 standards guarantees consistent quality, dimensional accuracy, and interchangeability.
- Versatile material compatibility allows use across multiple metals, streamlining inventory for diverse projects.
Professional Applications & Engineering Value
These zinc-plated steel tapping screws are engineered to address common challenges in metalworking and assembly, such as stripping, corrosion, and inconsistent thread formation. The Type F thread cutting design and coarse UNC threading enable self-tapping without pre-tapped holes, significantly reducing labor and tooling costs. Ideal for securing components in aluminum, brass, cast iron, and sheet metal, the screws' fully threaded shank and blunt tip ensure precise alignment and resistance to vibration loosening. By meeting ASME B18.6.3 specifications, they deliver reliable performance in automotive, machinery, and construction applications, minimizing downtime and maintenance needs.
Specification Summary & Compliance
This tapping screw features a 1/4"-20 UNC thread with Class 2A tolerance for precise fit, a pan head with Phillips No. 3 drive, and a 3" fully threaded length. It conforms to ASME B18.6.3 and SAE J933 manufacturing standards, ensuring dimensional consistency and performance reliability. The product is designed for use with a No. 2 drill bit (0.221" diameter) and complies with RoHS and REACH environmental regulations for safe industrial use.
