S-90287A841 4-40 x 3/4" 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
- Exceptional corrosion resistance through zinc plating, extending service life in demanding industrial environments
- Reliable fastening performance with 60,000 psi tensile strength for secure connections under stress
- Simplified installation with Class 2A thread fit ensuring smooth engagement and consistent torque application
- Maximum holding power through fully threaded design that distributes load evenly across the entire length
- Quick assembly efficiency with UNC coarse threads that reduce cross-threading risks and speed up installation
- Versatile rounded head design providing a finished appearance while accommodating various industrial applications
- Regulatory compliance assurance meeting RoHS 3 and REACH standards for global manufacturing requirements
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel rounded head screws deliver critical engineering solutions where corrosion resistance and high tensile strength are paramount. The zinc-plated steel construction provides essential protection against environmental factors in manufacturing facilities, outdoor equipment, and electronic enclosures. With coarse UNC threads and Class 2A thread fit, these fasteners prevent stripping during high-volume assembly while maintaining precise tolerances. The fully threaded design ensures maximum grip length for applications requiring uniform clamping force distribution. Ideal for industrial machinery, electrical panels, and automated systems, these screws address common challenges of vibration loosening and material degradation through their optimized thread form and protective surface treatment.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit tolerances and UNC coarse thread specifications. These rounded head screws feature a 0.211" head diameter and 3/4" length with right-hand threading. The product fully complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulatory requirements, ensuring environmental responsibility and material safety in industrial applications.
