S-90046A122 1/4"-28 x 5/8" NAS1801-4-10 High-Strength Steel Hex Head Screws with Phillips Drive

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – With 160,000 psi tensile strength, this screw reliably handles heavy-duty loads and high-stress applications, reducing the risk of fastener failure.
• Superior Corrosion Resistance – The cadmium plating provides excellent protection against rust and environmental degradation, extending service life in harsh conditions.
• Precision Thread Fit – Class 3A thread ensures tight, secure fastening with minimal play, ideal for applications requiring high vibration resistance and reliability.
• Versatile Installation Options – Combined external hex and Phillips drive allows for flexible tool use, speeding up assembly and reducing installation time.
• High Hardness & Durability – Rockwell C34 hardness offers excellent wear resistance, maintaining thread integrity and performance over repeated use.
• Compliant with Rigorous Standards – Meets NAS1801-4-10 specifications, ensuring consistency and reliability for aerospace and other high-performance industries.
• Fine Thread Design – UNF fine thread provides better adjustment and clamping force in thinner materials, enhancing joint stability.

Professional Applications & Engineering Value

This 1/4"-28 UNF Class 3A steel hex head screw is engineered to address critical challenges in demanding sectors such as aerospace, industrial machinery, and automotive assemblies. The cadmium plating significantly enhances corrosion resistance, which is vital for components exposed to moisture, chemicals, or outdoor environments. Its partially threaded design allows for precise clamping where full threading isn't necessary, reducing stress concentration and improving fatigue life. With a 160,000 psi tensile strength and Rockwell C34 hardness, it withstands extreme operational stresses without deformation. The external hex/Phillips drive offers installation flexibility, accommodating both hand and power tools for efficient maintenance and assembly. These features make it an ideal choice for high-strength and vibration-resistant applications, ensuring long-term reliability and safety.

Specification Summary & Compliance

This fastener adheres to precise dimensional and performance criteria, including Class 3A thread fit for superior accuracy and UNF fine thread specifications. It is manufactured in compliance with NAS1801-4-10 standards, ensuring it meets rigorous aerospace and industrial requirements. Additionally, the product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming it is free from hazardous substances and safe for use in regulated environments. The combination of steel material, cadmium finish, and exacting thread dimensions guarantees consistent performance and reliability across applications.