S-90086A686 1/4"-20 x 2 1/4" ASME B18.6.3, SAE J933 Tapping Screws
Tapping Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with black-oxide steel coating, extending service life in demanding industrial environments.
- Effortless installation in materials like aluminum, brass, and cast iron without pre-tapping, thanks to the thread-cutting F-type design.
- Secure, flush-mount fit with a standard 82° countersink angle and flat head profile, ideal for sheet metal and precision assemblies.
- High torque transmission via the No. 3 Phillips drive, reducing cam-out risk and ensuring reliable fastening.
- Full-length threading for maximum grip and uniform load distribution across the entire 2 1/4" length.
- Wide material compatibility with coarse UNC threads that resist loosening under vibration in diverse applications.
- Regulatory peace of mind with adherence to ASME B18.6.3 and RoHS 3, ensuring quality and environmental compliance.
Professional Applications & Engineering Value
These 1/4-20 UNC tapping screws are precision-engineered to address common challenges in metalworking and assembly. The thread-cutting F-type design eliminates the need for separate tapping operations, reducing labor time and tooling costs when fastening into aluminum, brass, cast iron, or sheet metal. The black-oxide steel construction provides a durable, corrosion-resistant finish that withstands harsh conditions, while the flat head with 82° countersink ensures a smooth, flush surface to prevent snagging and improve aesthetics. Fully threaded and with a coarse thread pitch, these screws offer superior pull-out resistance and vibration dampening, making them a reliable choice for industrial fasteners in construction, machinery, and automotive sectors where durability and compliance with ASME B18.6.3 standards are critical.
Specification Summary & Compliance
These screws feature a 1/4"-20 UNC coarse thread with standard Class 2A tolerances for consistent fit, a fully threaded shank, and a blunt tip for controlled penetration. They comply with ASME B18.6.3 specifications and are RoHS 3 (2015/863/EU) Compliant, ensuring they meet rigorous industry and environmental standards for safe, reliable use in professional applications.
