S-90287A837 4-40 x 1/4" Tamper-Resistant One-Way-Drive Steel Round Head Screws
Tamper-Resistant One-Way-Drive Steel Round 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 demanding industrial environments
- High tensile strength of 60,000 psi ensures reliable fastening under substantial mechanical stress
- Class 2A thread fit provides consistent, reliable engagement while maintaining easy assembly
- Fully threaded design maximizes grip strength and distributes load evenly across the entire fastener length
- Coarse UNC threading enables quick installation and superior resistance to vibration loosening
- Rounded head profile offers smooth surface finish that minimizes snagging and improves safety
- Compliance with RoHS 3 and REACH regulations ensures environmental responsibility and global market acceptance
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel rounded head screws deliver exceptional performance in industrial assembly applications where vibration resistance and corrosion protection are critical. The coarse thread design provides superior holding power in softer materials and faster installation times, while the fully threaded configuration ensures maximum engagement throughout the entire 1/4" length. The zinc-plated steel construction offers excellent durability against environmental factors, making these industrial screws ideal for manufacturing equipment, electronic enclosures, and machinery assemblies where 60,000 psi tensile strength is required to maintain joint integrity under dynamic loads and thermal cycling conditions.
Specification Summary & Compliance
Manufactured to precise inch system dimensions with Class 2A thread fit tolerance for consistent performance. Features 4-40 UNC coarse threads with right-hand direction and fully threaded design. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets. The standardized UNC thread form guarantees compatibility with industry-standard components and tooling.
