S-90087A845 4-40 x 7/8" 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-cutting performance in aluminum, brass, cast iron, and sheet metal without pre-tapping, reducing installation time and labor costs.
- Enhanced corrosion resistance with zinc-plated steel construction, ensuring long-term reliability in demanding industrial environments.
- Secure and efficient driving with Phillips No. 1 drive, providing excellent torque transfer and reducing cam-out risks during assembly.
- Optimized coarse UNC threads for faster installation and strong holding power in various metal substrates.
- Fully threaded 7/8" length delivers maximum grip and uniform stress distribution along the entire fastener.
- Standard pan head design offers a low-profile, rounded finish for smooth surface contact and reduced snagging.
- Compliance with ASME B18.6.3 and SAE J933 guarantees consistent quality, dimensional accuracy, and interchangeability.
Professional Applications & Engineering Value
These 4-40 UNC thread cutting screws are engineered to address common challenges in metal assembly, such as stripping, loosening, and corrosion. Made from zinc-plated steel, they provide a durable barrier against moisture and chemicals, extending service life in harsh conditions. The coarse thread design and thread-cutting tip enable self-tapping into aluminum, brass, cast iron, and sheet metal without pre-drilled threads, minimizing hole preparation and speeding up production lines. The Phillips drive and pan head ensure easy installation with standard tools, making them ideal for HVAC, automotive, and machinery applications where reliability and efficiency are critical.
Specification Summary & Compliance
This product adheres to Class 2A thread tolerances per UNC standards and is manufactured in compliance with ASME B18.6.3 and SAE J933 specifications. It features a 7/8" length, No. 41 drill bit compatibility (0.096" diameter), and fully threaded shank for precise fit. The screws meet industry requirements for dimensional accuracy and are suitable for use under general regulatory guidelines, including RoHS and REACH, ensuring environmental and safety standards are upheld.
