S-90044A185 1/4"-28 x 5 1/2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi for reliable performance in heavy-duty and high-stress applications.
• Superior corrosion resistance from the black-oxide finish, extending service life in harsh industrial environments.
• Precision Class 3A thread fit ensures tight, secure fastening with minimal risk of loosening or cross-threading.
• High hardness rating (Rockwell C37) provides excellent wear resistance and durability under repeated use.
• Partially threaded design allows for precise clamping force control and reduced thread galling.
• Fine UNF thread offers improved vibration resistance and better load distribution compared to coarse threads.
• Standard hex socket drive enables easy installation and removal in confined spaces with common tools.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, this black-oxide alloy steel socket head cap screw combines high tensile strength and corrosion resistance to solve critical fastening challenges. The 1/4"-28 UNF fine thread and Class 3A thread fit provide superior vibration resistance and precise alignment in machinery, automotive assemblies, and precision equipment. The partially threaded shank minimizes stress concentration, reducing the risk of fatigue failure. Ideal for applications requiring reliable, high-strength fasteners that withstand extreme loads and environmental exposure, this screw ensures long-term operational integrity and reduced maintenance needs.

Specification Summary & Compliance

This socket head cap screw meets ASTM A574 specifications for high-strength alloy steel fasteners. It features a Class 3A thread fit for precise tolerance and a fine UNF thread with a diameter of 0.25". The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industrial reliability.