S-90279A112 4-40 x 5/8" ASME B18.6.3 Steel Round Head Phillips Screws
Steel Round Head Phillips 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
- Exceptional 60,000 psi tensile strength ensures reliable fastening under high-stress conditions
- Class 2A thread fit provides consistent, precise engagement for reduced assembly time and improved reliability
- Fully threaded design offers maximum grip length and uniform load distribution across the entire fastener
- Rockwell B69 hardness rating maintains structural integrity and prevents deformation during installation
- Phillips No. 1 drive system enables efficient installation with standard tools while minimizing cam-out
- 4-40 UNC coarse threading delivers quick assembly and superior resistance to vibration loosening
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel rounded head screws address critical industrial fastening challenges where corrosion resistance and mechanical reliability are paramount. The zinc-plated steel construction provides essential protection against oxidation and environmental degradation, making them ideal for electrical enclosures, machinery assemblies, and automotive components. The fully threaded design combined with coarse UNC threading ensures rapid installation and maintains secure connections in vibration-prone applications. The rounded head profile with Phillips drive offers a balanced combination of aesthetic appeal and practical installation efficiency, while the Class 2A thread fit guarantees consistent performance in high-volume manufacturing environments where precision and repeatability are essential.
Specification Summary & Compliance
This fastener maintains Class 2A thread fit tolerance per UNC standards with 4-40 thread size and coarse thread spacing. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance requirements. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations for chemical safety, ensuring environmental responsibility in industrial applications.
