S-90273A110 4-40 x 1/2" ASME B18.6.3 Steel Phillips Flat Head Screws
Steel Phillips Flat Head 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 harsh industrial environments.
- High tensile strength of 60,000 psi ensures reliable, durable fastening under demanding mechanical loads.
- Class 2A thread fit provides consistent, smooth installation with standard UNC coarse threading for quick assembly.
- 82° countersink angle and flat head design allows for flush mounting, reducing snagging and improving aesthetics.
- Phillips drive (No. 1 size) offers efficient torque application and reduces cam-out during installation.
- Full threading along the 1/2" length maximizes grip and load distribution across the entire fastener.
- Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees quality, safety, and environmental standards for global use.
Professional Applications & Engineering Value
These 4-40 UNC flat head screws are engineered to address common industrial fastening challenges, such as vibration loosening and corrosion-induced failure. Made from zinc-plated steel, they provide excellent protection against rust and wear, making them ideal for machinery, electronics, and automotive assemblies. The coarse thread design ensures quick, secure engagement in various materials, while the standard flat head profile with an 82° countersink angle enables seamless integration into surfaces, minimizing protrusion and enhancing safety. With a Rockwell B70 hardness and high tensile strength, these screws maintain integrity under stress, reducing maintenance needs and downtime in production environments.
Specification Summary & Compliance
This product adheres to precise dimensional standards, including Class 2A thread fit and UNC coarse threading for consistent performance. It meets ASME B18.6.3 specifications for manufacturing quality and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are upheld.
