S-90046A104 4-40 x 3/4" NAS1801-04-12 High-Strength Steel Hex Head Screws with Phillips Drive
High-Strength Steel Hex Head Screws with Phillips Drive
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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 160,000 psi ensures reliable performance in high-stress industrial applications.
- Superior corrosion resistance from cadmium plating extends service life in harsh environments.
- Precise Class 3A thread fit provides secure, vibration-resistant fastening with minimal risk of loosening.
- Partially threaded design allows for controlled clamping force and reduced thread galling.
- High hardness rating (Rockwell C34) enhances durability and wear resistance during installation and use.
- Coarse UNC threading enables quick assembly and disassembly, improving maintenance efficiency.
- Dual external hex/Phillips drive offers flexible installation options with standard tools.
Professional Applications & Engineering Value
This 4-40 UNC steel hex head screw is engineered to address critical fastening challenges in aerospace, automotive, and heavy machinery sectors. The cadmium plated finish provides robust protection against oxidation and chemical exposure, significantly reducing maintenance costs in corrosive environments. Its partially threaded configuration ensures optimal grip strength while preventing over-torquing and material stress concentration. With a coarse thread spacing and Class 3A thread fit, it delivers rapid installation and reliable performance in high-vibration applications, making it ideal for assemblies requiring repeated access. Compliant with NAS1801-04-12 specifications, it meets rigorous industry standards for precision and reliability.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit tolerances per UNC standards, ensuring precise engagement and consistent performance. Manufacturing complies with NAS1801-04-12 specifications for dimensional accuracy and material integrity. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming adherence to environmental and safety regulations for hazardous substances.
