S-90484A161 4-40 x 1/4" ASME B18.3, ASTM F835 Tamper-Resistant Hex-Drive Steel Button Head Screws
Tamper-Resistant Hex-Drive Steel Button 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
- Exceptional tensile strength of 130,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
- Tamper-resistant hex drive provides enhanced security, preventing unauthorized removal in sensitive or public-facing applications.
- Black-oxide coating on alloy steel offers superior corrosion resistance, extending service life in harsh industrial environments.
- Class 3A thread fit delivers precise, tight-tolerance engagement for secure fastening and vibration resistance.
- Fully threaded design allows for maximum grip and holding power along the entire screw length.
- High Rockwell C39 hardness ensures excellent wear resistance and durability, maintaining integrity through repeated use.
- Rounded button head profile provides a low-profile, smooth finish that minimizes snagging and improves safety.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, these 4-40 UNC thread screws with coarse thread spacing and right-hand threading deliver quick assembly and high clamping force. The black-oxide alloy steel construction combats rust and oxidation, making them ideal for machinery, electronics, and outdoor equipment where corrosion resistance is critical. The tamper-resistant hex drive secures components against vandalism or tampering, while the fully threaded design ensures consistent load distribution. With a rounded button head, these screws reduce surface damage and provide a clean, professional appearance, solving common issues of loosening and wear in industrial applications.
Specification Summary & Compliance
This screw meets ASME B18.3 specifications and features a Class 3A thread fit for high precision. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are upheld. Dimensions include a 1/4" length, 3/32" drive size, and UNC coarse threads, providing reliable performance in regulated industries.
